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  • Spectroscopic Fourth-order Coronagraph for the Characterization of Terrestrial Planets at Small Angular Separations from Host Stars
    Astron. J. (IF 5.838) Pub Date : 2021-01-22
    Taro Matsuo, Satoshi Itoh, and Yuji Ikeda

    We propose a new approach for high-contrast imaging at the diffraction limit using segmented telescopes in a modest observation bandwidth. This concept, named “spectroscopic fourth-order coronagraphy,” is based on a fourth-order coronagraph with a focal-plane mask that modulates the complex amplitude of the Airy disk along one direction. While coronagraphs applying the complex amplitude mask can achieve

    更新日期:2021-01-22
  • TOI-954 b and K2-329 b: Short-period Saturn-mass Planets that Test whether Irradiation Leads to Inflation
    Astron. J. (IF 5.838) Pub Date : 2021-01-22
    Lizhou Sha, Chelsea X. Huang, Avi Shporer, Joseph E. Rodriguez, Andrew Vanderburg, Rafael Brahm, Janis Hagelberg, Elisabeth C. Matthews, Carl Ziegler, John H. Livingston, Keivan G. Stassun, Duncan J. Wright, Jeffrey D. Crane, Néstor Espinoza, François Bouchy, Gáspár Á. Bakos, Karen A. Collins, George Zhou, Allyson Bieryla, Joel D. Hartman, Robert A. Wittenmyer, Louise D. Nielsen, Peter Plavchan, Daniel

    We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including

    更新日期:2021-01-22
  • A Synoptic VLBI Technique for Localizing Nonrepeating Fast Radio Bursts with CHIME/FRB
    Astron. J. (IF 5.838) Pub Date : 2021-01-22
    Calvin Leung, Juan Mena-Parra, Kiyoshi Masui, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Mathieu Bruneault, Tomas Cassanelli, Davor Cubranic, Jane F. Kaczmarek, Victoria Kaspi, Tom Landecker, Daniele Michilli, Nikola Milutinovic, Chitrang Patel, Ziggy Pleunis, Mubdi Rahman, Andre Renard, Pranav Sanghavi, Ingrid H. Stairs, Paul Scholz and Keith Vanderlinde (CHIME/FRB Collaboration)

    We demonstrate the blind interferometric detection and localization of two fast radio bursts (FRBs) with subarcminute precision on the 400 m baseline between the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and the CHIME Pathfinder. In the same spirit as Very Long Baseline Interferometry (VLBI), the telescopes were synchronized to separate clocks, and the channelized voltage (herein referred

    更新日期:2021-01-22
  • The Relationship between Photometric Measurements and Visual Magnitude Estimates for Red Stars
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Robert R. Cadmus Jr.

    The nature of the relationship between visual brightness estimates for red stars and the corresponding V magnitudes has been investigated by comparing visual estimates in the American Association of Variable Star Observers database to photoelectric photometry of 39 semiregular variable stars obtained at Grinnell College over a 30 yr period. A general mathematical description of this relationship has

    更新日期:2021-01-21
  • The Red Supergiant Content of M31 and M33
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Philip Massey, Kathryn F. Neugent, Emily M. Levesque, Maria R. Drout, and Stéphane Courteau

    We identify red supergiants (RSGs) in our spiral neighbors M31 and M33 using near-IR (NIR) photometry complete to a luminosity limit of ##IMG## [http://ej.iop.org/images/1538-3881/161/2/79/ajabd01fieqn1.gif] {$\mathrm{log}L/{L}_{\odot }=4.0$} . Our archival survey data cover 5 deg 2 of M31, and 3 deg 2 for M33, and are likely spatially complete for these massive stars. Gaia is used to remove foreground

    更新日期:2021-01-21
  • The Second Data Release of the Survey of the MAgellanic Stellar History (SMASH)
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    David L. Nidever, Knut Olsen, Yumi Choi, Tomas Ruiz-Lara, Amy E. Miller, L. Clifton Johnson, Cameron P. M. Bell, Robert D. Blum, Maria-Rosa L. Cioni, Carme Gallart, Steven R. Majewski, Nicolas F. Martin, Pol Massana, Antonela Monachesi, Noelia E. D. Noël, Joanna D. Sakowska, Roeland P. van der Marel, Alistair R. Walker, Dennis Zaritsky, Eric F. Bell, Blair C. Conn, Thomas J. L. de Boer, Robert A. Gruendl

    The Large and Small Magellanic Clouds (LMC and SMC) are the largest satellite galaxies of the Milky Way and close enough to allow for a detailed exploration of their structure and formation history. The Survey of the MAgellanic Stellar History (SMASH) is a community Dark Energy Camera (DECam) survey of the Magellanic Clouds using ∼50 nights to sample over ∼2400 deg 2 centered on the Clouds at ∼20%

    更新日期:2021-01-21
  • Three New Late-type Stellar Companions to Very Dusty WISE Debris Disks Identified with SPHERE Imaging
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Elisabeth C. Matthews, Sasha Hinkley, Karl Stapelfeldt, Arthur Vigan, Dimitri Mawet, Ian J. M. Crossfield, Trevor J. David, Eric Mamajek, Tiffany Meshkat, Farisa Morales, and Deborah Padgett

    Debris disk stars are good targets for high-contrast imaging searches for planetary systems, since debris disks have been shown to have a tentative correlation with giant planets. We selected 20 stars identified as debris disk hosts by the WISE mission, with particularly high levels of warm dust. We observed these with the VLT/SPHERE high-contrast imaging instrument with the goal of finding planets

    更新日期:2021-01-21
  • Variability in NGC 3201 Giant Stars and Its Impact on Their Spectroscopic [Fe/H] Determination
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Á. Llancaqueo Albornoz, S. Villanova, C. C. Cortés, J. A. Ahumada, and C. Parisi

    We present the analysis of 34 light curves in V and I of 17 giant stars in the globular cluster NGC 3201 to check if such stars are variable and if their variability has some kind of impact on the iron abundance as obtained from spectroscopic measurements. First, we computed the generalized Lomb–Scargle and phase dispersion minimization periodograms of the sample to check if the stars were variables

    更新日期:2021-01-21
  • Excalibur : A Nonparametric, Hierarchical Wavelength Calibration Method for a Precision Spectrograph
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Lily L. Zhao, David W. Hogg, Megan Bedell, and Debra A. Fischer

    Excalibur is a nonparametric, hierarchical framework for precision wavelength calibration of spectrographs. It is designed with the needs of extreme-precision radial-velocity (EPRV) instruments in mind, which require calibration or stabilization to better than 10 −4 pixels. Instruments vary along only a few dominant degrees of freedom, especially EPRV instruments that feature highly stabilized optical

    更新日期:2021-01-21
  • Departure from the Exact Location of Mean Motion Resonances Induced by the Gas Disk in Systems Observed by Kepler
    Astron. J. (IF 5.838) Pub Date : 2021-01-20
    Su Wang, D. N. C. Lin, Xiaochen Zheng, and Jianghui Ji

    The statistical results of transiting planets show that there are two peaks, around 1.5 and 2.0, in the distribution of orbital period ratios. A large number of planet pairs are found near the exact location of mean motion resonances (MMRs). In this work, we find that the depletion and structures of the gas disk play crucial roles in driving planet pairs out of the exact location of MMRs. Under such

    更新日期:2021-01-21
  • Dust Production from Mini Outbursts of Comet 29P/Schwassmann-Wachmann 1
    Astron. J. (IF 5.838) Pub Date : 2021-01-18
    Tiffany D. Clements and Yanga Fernandez

    Here we report on the results of observations of comet 29P/Schwassmann-Wachmann 1 obtained using four telescopes, in three different countries, from 2019 September 25 to 2020 January 19. During the last four months of 2019, comet 29P/Schwassmann-Wachmann 1 exhibited new outburst behavior indicative of small or mini outbursts in which the brightening of the comet lasted from only a few days to more

    更新日期:2021-01-19
  • Relationships between the Stellar, Gaseous, and Star Formation Disks in LITTLE THINGS Dwarf Irregular Galaxies: Indirect Evidence for Substantial Fractions of Dark Molecular Gas
    Astron. J. (IF 5.838) Pub Date : 2021-01-18
    Deidre A. Hunter, Bruce G. Elmegreen, Esther Goldberger, Hannah Taylor, Anton I. Ermakov, Kimberly A. Herrmann, Se-Heon Oh, Bradley Malko, Brian Barandi, and Ryan Jundt

    The stellar, gaseous and young stellar disks in the LITTLE THINGS sample of nearby dwarf irregular galaxies are fitted with functions to search for correlations between the parameters. We find that the H i radial profiles are generally flatter in the center and fall faster in the outer regions than the V -band profiles, while young stars are more centrally concentrated, especially if the H i is more

    更新日期:2021-01-19
  • Decaying Orbit of the Hot Jupiter WASP-12b: Confirmation with TESS Observations
    Astron. J. (IF 5.838) Pub Date : 2021-01-18
    Jake D. Turner, Andrew Ridden-Harper, and Ray Jayawardhana

    Theory suggests that the orbits of some close-in giant planets should decay due to tidal interactions with their host stars. To date, WASP-12b is the only hot Jupiter reported to have a decaying orbit, at a rate of 29 ± 2 ms yr −1 . We analyzed data from NASA’s Transiting Exoplanet Survey Satellite (TESS) to verify that WASP-12b’s orbit is indeed changing. We find that the TESS transit and occultation

    更新日期:2021-01-19
  • WASP-107b’s Density Is Even Lower: A Case Study for the Physics of Planetary Gas Envelope Accretion and Orbital Migration
    Astron. J. (IF 5.838) Pub Date : 2021-01-18
    Caroline Piaulet, Björn Benneke, Ryan A. Rubenzahl, Andrew W. Howard, Eve J. Lee, Daniel Thorngren, Ruth Angus, Merrin Peterson, Joshua E. Schlieder, Michael Werner, Laura Kreidberg, Tareq Jaouni, Ian J. M. Crossfield, David R. Ciardi, Erik A. Petigura, John Livingston, Courtney D. Dressing, Benjamin J. Fulton, Charles Beichman, Jessie L. Christiansen, Varoujan Gorjian, Kevin K. Hardegree-Ullman, Jessica

    With a mass in the Neptune regime and a radius of Jupiter, WASP-107b presents a challenge to planet formation theories. Meanwhile, the planet’s low surface gravity and the star’s brightness also make it one of the most favorable targets for atmospheric characterization. Here, we present the results of an extensive 4 yr Keck/HIRES radial-velocity (RV) follow-up program of the WASP-107 system and provide

    更新日期:2021-01-19
  • The Volume-complete Sample of M Dwarfs with Masses0.1 ≤ M / M ⊙ ≤ 0.3 within 15 Parsecs
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    Jennifer G. Winters, David Charbonneau, Todd J. Henry, Jonathan M. Irwin, Wei-Chun Jao, Adric R. Riedel, and Kenneth Slatten

    M dwarfs with masses0.1 ≤ M / M ⊙ ≤ 0.3 are under increasing scrutiny because these fully convective stars pose interesting astrophysical questions regarding their magnetic activity and angular momentum history. They also afford the most accessible near future opportunity to study the atmospheres of terrestrial planets. Because they are intrinsically low in luminosity, the identification of the nearest

    更新日期:2021-01-19
  • Hot Stars with Kepler Planets Have High Obliquities
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    Emma M. Louden, Joshua N. Winn, Erik A. Petigura, Howard Isaacson, Andrew W. Howard, Kento Masuda, Simon Albrecht, and Molly R. Kosiarek

    It has been known for a decade that hot stars with hot Jupiters tend to have high obliquities. Less is known about the degree of spin–orbit alignment for hot stars with other kinds of planets. Here, we reassess the obliquities of hot Kepler stars with transiting planets smaller than Neptune, based on spectroscopic measurements of their projected rotation velocities ( ##IMG## [http://ej.iop.org/ima

    更新日期:2021-01-19
  • HD 63021: Chromospheric Activity and Mass Transfer in a Close Binary
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    David G. Whelan, S. Drew Chojnowski, Jonathan Labadie-Bartz, James Daglen, Ken Hudson, Gary M. Casey, Guy S. Stringfellow, Kathryn V. Lester, John Barry, Joshua Heinerikson, Dan Pankratz, Mary Schreffler, Ryan Maderak, Nick Lotspeich, Molly Vitale-Sullivan, and Micah Woodard

    Prompted by X-ray detections from multiple surveys, we investigated the A-type star HD 63021 and found that it is a double-lined spectroscopic binary with highly variable emission associated with the primary star. Analysis of our multiepoch spectroscopic observations, the majority of which were carried out on small-aperture telescopes, indicates a very short orbital period of just 2.9 days and a mass

    更新日期:2021-01-19
  • Refined Telluric Absorption Correction for Low-resolution Ground-based Spectroscopy: Resolution and Radial Velocity Effects in the O 2 A -band for Exoplanets and K i Emission Lines
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    Stefan Kimeswenger, Manuel Rainer, Norbert Przybilla, and Wolfgang Kausch

    Telluric correction of spectroscopic observations is either performed via standard stars that are observed close in time and airmass along with the science target, or recently growing in importance, by theoretical telluric absorption modeling. Both approaches work fine when the telluric lines are resolved, i.e., at a spectral resolving power larger than about 10,000, and it is sufficient to facilitate

    更新日期:2021-01-19
  • TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces–Eridanus Stream
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    Elisabeth R. Newton, Andrew W. Mann, Adam L. Kraus, John H. Livingston, Andrew Vanderburg, Jason L. Curtis, Pa Chia Thao, Keith Hawkins, Mackenna L. Wood, Aaron C. Rizzuto, Abderahmane Soubkiou, Benjamin M. Tofflemire, George Zhou, Ian J. M. Crossfield, Logan A. Pearce, Karen A. Collins, Dennis M. Conti, Thiam-Guan Tan, Steven Villeneuva, Alton Spencer, Diana Dragomir, Samuel N. Quinn, Eric L. N. Jensen

    Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). TOI 451 is a member of the 120 Myr old Pisces–Eridanus stream (Psc–Eri). We confirm membership in the stream with its kinematics, its lithium abundance, and the rotation and UV excesses

    更新日期:2021-01-19
  • HAT-P-68b: A Transiting Hot Jupiter around a K5 Dwarf Star
    Astron. J. (IF 5.838) Pub Date : 2021-01-14
    Bethlee M. Lindor, Joel D. Hartman, Gáspár Á. Bakos, Waqas Bhatti, Zoltan Csubry, Kaloyan Penev, Allyson Bieryla, David W. Latham, Guillermo Torres, Lars A. Buchhave, Miguel de Val-Borro, Andrew W. Howard, Howard Isaacson, Benjamin J. Fulton, Isabelle Boisse, Alexandre Santerne, Guillaume Hébrard, Támás Kovács, Chelsea X. Huang, Jack Dembicky, Emilio Falco, Mark E. Everett, Elliott P. Horch, József

    We report the discovery by the ground-based Hungarian-made Automated Telescope Network (HATNet) survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 M J , and radius of 1.072 ± 0.012 R J . The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K-dwarf star of mass ##IMG## [http://ej.iop.org/images/1538-3881/161/2/64/ajabc700ieqn1

    更新日期:2021-01-19
  • PBjam: A Python Package for Automating Asteroseismology of Solar-like Oscillators
    Astron. J. (IF 5.838) Pub Date : 2021-01-12
    M. B. Nielsen, G. R. Davies, W. H. Ball, A. J. Lyttle, T. Li, O. J. Hall, W. J. Chaplin, P. Gaulme, L. Carboneau, J. M. J. Ong, R. A. García, B. Mosser, I. W. Roxburgh, E. Corsaro, O. Benomar, A. Moya, and M. N. Lund

    Asteroseismology is an exceptional tool for studying stars using the properties of observed modes of oscillation. So far the process of performing an asteroseismic analysis of a star has remained somewhat esoteric and inaccessible to nonexperts. In this software paper we describe PBjam , an open-source Python package for analyzing the frequency spectra of solar-like oscillators in a simple but principled

    更新日期:2021-01-12
  • A Differential Measurement of Circumstellar Extinction for AA Tau’s 2011 Dimming Event
    Astron. J. (IF 5.838) Pub Date : 2021-01-12
    K. R. Covey, K. A. Larson, G. J. Herczeg, and C. F. Manara

    AA Tau is a classical T Tauri star with a highly inclined, warped circumstellar disk. For decades, AA Tau exhibited photometric and spectroscopic variabilities that were successfully modeled as occultations of the primary star by circumstellar material. In 2011, AA Tau entered an extended faint state, presumably due to enhanced levels of circumstellar dust. We use two sets of contemporaneous optical–near-IR

    更新日期:2021-01-12
  • Total X-Ray Emission from the LMC Observed with HaloSat
    Astron. J. (IF 5.838) Pub Date : 2021-01-11
    H. Gulick, P. Kaaret, A. Zajczyk, D. M. LaRocca, J. Bluem, R. Ringuette, K. Jahoda, and K. D. Kuntz

    We constrain the global parameters of the Large Magellanic Cloud (LMC) by modeling the first soft X-ray (0.4–6.8 keV) observations of the entire LMC produced in a single pointing with moderate spectral resolution by the HaloSat CubeSat. These data are best fit with the sum of two thermal plasma components in collisional ionization equilibrium and a power law. We find cool(0.210 ± 0.014 keV) and hot

    更新日期:2021-01-12
  • Even More Rapidly Rotating Pre-main-sequence M Dwarfs with Highly Structured Light Curves: An Initial Survey in the Lower Centaurus-Crux and Upper Centaurus-Lupus Associations
    Astron. J. (IF 5.838) Pub Date : 2021-01-11
    John Stauffer, Luisa M. Rebull, Moira Jardine, Andrew Collier Cameron, Ann Marie Cody, Lynne A. Hillenbrand, David Barrado, Ethan Kruse, and Brian P. Powell

    Using K2, we recently discovered a new type of periodic photometric variability while analyzing the light curves of members of Upper Sco. The 23 exemplars of this new variability type are all mid-M dwarfs, with short rotation periods. Their phased light curves have one or more broad flux dips or multiple arcuate structures which are not explicable by photospheric spots or eclipses by solid bodies.

    更新日期:2021-01-12
  • The K2 M67 Study: Precise Mass for a Turnoff Star in the Old Open Cluster M67
    Astron. J. (IF 5.838) Pub Date : 2021-01-11
    Eric L. Sandquist, David W. Latham, Robert D. Mathieu, Emily Leiner, Andrew Vanderburg, Dennis Stello, Jerome A. Orosz, Luigi R. Bedin, Mattia Libralato, Luca Malavolta, and Domenico Nardiello

    We present a study of the bright detached eclipsing main-sequence binary WOCS 11028 (Sanders 617) in the open cluster M67. Although the binary has only one eclipse per orbital cycle, we show that the masses of the stars can be derived very precisely thanks to a strong constraint on the orbital inclination: M A = 1.222 ± 0.006 M ⊙ and M B = 0.909 ± 0.004 M ⊙ . We use a spectral energy distribution fitting

    更新日期:2021-01-12
  • The TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561
    Astron. J. (IF 5.838) Pub Date : 2021-01-11
    Lauren M. Weiss, Fei Dai, Daniel Huber, John M. Brewer, Karen A. Collins, David R. Ciardi, Elisabeth C. Matthews, Carl Ziegler, Steve B. Howell, Natalie M. Batalha, Ian J. M. Crossfield, Courtney Dressing, Benjamin Fulton, Andrew W. Howard, Howard Isaacson, Stephen R. Kane, Erik A Petigura, Paul Robertson, Arpita Roy, Ryan A. Rubenzahl, Joseph D. Twicken, Zachary R. Claytor, Keivan G. Stassun, Mason

    We report the discovery of TOI-561, a multiplanet system in the galactic thick disk that contains a rocky, ultra-short-period planet. This bright ( V = 10.2) star hosts three small transiting planets identified in photometry from the NASA TESS mission: TOI-561 b (TOI-561.02, P = 0.44 days, R p = 1.45 ± 0.11 R ⊕ ), c (TOI-561.01, P = 10.8 days, R p = 2.90 ± 0.13 R ⊕ ), and d (TOI-561.03, P = 16.3 days

    更新日期:2021-01-12
  • Mapping Gaia Parallax Systematic Errors over the Sky with Faint Milky Way Stars
    Astron. J. (IF 5.838) Pub Date : 2021-01-11
    Mark A. Fardal, Roeland van der Marel, Andrés del Pino, and Sangmo Tony Sohn

    Parallaxes measured by the Gaia mission have huge significance for astronomy, but parallaxes in Gaia DR2 are known to have systematic errors that depend on the source position and other quantities. We use the abundant information in faint Milky Way stars, along with the Gaia Object Generator simulation of the Gaia catalog, to probe the spatial dependence of Gaia DR2 parallax systematic errors in an

    更新日期:2021-01-12
  • The Role of Early Giant-planet Instability in Terrestrial Planet Formation
    Astron. J. (IF 5.838) Pub Date : 2021-01-06
    David Nesvorný, Fernando V. Roig, and Rogerio Deienno

    The terrestrial planets are believed to have formed by violent collisions of tens of lunar- to Mars-size protoplanets at time t < 200 Myr after the protoplanetary gas disk dispersal ( t 0 ). The solar system giant planets rapidly formed during the protoplanetary disk stage and, after t 0 , radially migrated by interacting with outer disk planetesimals. An early ( t < 100 Myr) dynamical instability

    更新日期:2021-01-12
  • SDSS-IV MaNGA: Modeling the Spectral Line-spread Function to Subpercent Accuracy
    Astron. J. (IF 5.838) Pub Date : 2021-01-06
    David R. Law, Kyle B. Westfall, Matthew A. Bershady, Michele Cappellari, Renbin Yan, Francesco Belfiore, Dmitry Bizyaev, Joel R. Brownstein, Yanping Chen, Brian Cherinka, Niv Drory, Daniel Lazarz, and Shravan Shetty

    The Sloan Digital Sky Survey IV Mapping Nearby Galaxies at APO (MaNGA) program has been operating from 2014 to 2020, and has now observed a sample of 9269 galaxies in the low redshift universe ( z ∼ 0.05) with integral-field spectroscopy. With rest-optical ( λλ 0.36–1.0 μ m) spectral resolution R ∼ 2000 the instrumental spectral line-spread function (LSF) typically has 1 σ width of about 70 km s −1

    更新日期:2021-01-12
  • The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b
    Astron. J. (IF 5.838) Pub Date : 2021-01-06
    Kyle B. Sheppard, Luis Welbanks, Avi M. Mandell, Nikku Madhusudhan, Nikolay Nikolov, Drake Deming, Gregory W. Henry, Michael H. Williamson, David K. Sing, Mercedes López-Morales, Jegug Ih, Jorge Sanz-Forcada, Panayotis Lavvas, Gilda E. Ballester, Thomas M. Evans, Antonio García Muñoz, and Leonardo A. dos Santos

    We present a comprehensive analysis of the 0.3–5 μ m transit spectrum for the inflated hot Jupiter HAT-P-41b. The planet was observed in transit with Hubble STIS and WFC3 as part of the Hubble Panchromatic Comparative Exoplanet Treasury (PanCET) program, and we combine those data with warm Spitzer transit observations. We extract transit depths from each of the data sets, presenting the STIS transit

    更新日期:2021-01-12
  • Mildly Hierarchical Triple Dynamics and Applications to the Outer Solar System
    Astron. J. (IF 5.838) Pub Date : 2020-12-31
    Hareesh Bhaskar, Gongjie Li, Sam Hadden, Matthew J. Payne, and Matthew J. Holman

    Three-body interactions are ubiquitous in astrophysics. For instance, Kozai–Lidov oscillations in hierarchical triple systems have been studied extensively and applied to a wide range of astrophysical systems. However, mildly hierarchical triples also play an important role, but they are less explored. In this work, we consider the secular dynamics of a test particle in a mildly hierarchical configuration

    更新日期:2021-01-02
  • Physical Parameters of the Multiplanet Systems HD 106315 and GJ 9827
    Astron. J. (IF 5.838) Pub Date : 2020-12-31
    Molly R. Kosiarek, David A. Berardo, Ian J. M. Crossfield, Cesar Laguna, Caroline Piaulet, Joseph M. Akana Murphy, Steve B. Howell, Gregory W. Henry, Howard Isaacson, Benjamin Fulton, Lauren M. Weiss, Erik A. Petigura, Aida Behmard, Lea A. Hirsch, Johanna Teske, Jennifer A. Burt, Sean M. Mills, Ashley Chontos, Teo Močnik, Andrew W. Howard, Michael Werner, John H. Livingston, Jessica Krick, Charles

    HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets’ ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectroscopy. Through a multiyear high-cadence observing campaign

    更新日期:2021-01-02
  • Main-sequence Scatter is Real: The Joint Dependence of Galaxy Clustering on Star Formation and Stellar Mass
    Astron. J. (IF 5.838) Pub Date : 2020-12-31
    Angela M. Berti, Alison L. Coil, Andrew P. Hearin, and Peter S. Behroozi

    We present new measurements of the clustering of stellar-mass-complete samples of ∼40,000 SDSS galaxies at z ∼ 0.03 as a joint function of stellar mass and specific star formation rate (sSFR). Our results confirm what Coil et al. find at z ∼ 0.7: galaxy clustering is a stronger function of sSFR at fixed stellar mass than of stellar mass at fixed sSFR. We also find that galaxies above the star-forming

    更新日期:2021-01-02
  • Hubble WFC3 Spectroscopy of the Habitable-zone Super-Earth LHS 1140 b
    Astron. J. (IF 5.838) Pub Date : 2020-12-24
    Billy Edwards, Quentin Changeat, Mayuko Mori, Lara O. Anisman, Mario Morvan, Kai Hou Yip, Angelos Tsiaras, Ahmed Al-Refaie, Ingo Waldmann, and Giovanna Tinetti

    Atmospheric characterization of temperate, rocky planets is the holy grail of exoplanet studies. These worlds are at the limits of our capabilities with current instrumentation in transmission spectroscopy and challenge our state-of-the-art statistical techniques. Here we present the transmission spectrum of the temperate super-Earth LHS 1140b using the Hubble Space Telescope (HST). The Wide Field

    更新日期:2020-12-24
  • A Study about the Secular Evolution of the Hierarchical Three-body Problem Using the Numerical Integrator TIDES
    Astron. J. (IF 5.838) Pub Date : 2020-12-23
    José A. Docobo, Luca Piccotti, Alberto Abad, and Pedro P. Campo

    The hierarchical three-body problem is one of the classical issues of celestial mechanics, but recently it has regained importance due to its applications to new scenarios, like compact objects and exoplanets. In this paper we realize a computational study of this problem using the TIDES software package, which is applied not only to a set of theoretical cases but also to actual stellar systems. The

    更新日期:2020-12-24
  • Flaring and Spot Activities on the Semi-detached Binary System KIC 06852488
    Astron. J. (IF 5.838) Pub Date : 2020-12-23
    Xiang-dong Shi, Sheng-bang Qian, Lin-jia Li, and Nian-ping Liu

    The continuous and unbroken time-series photometry data of Kepler and the Transiting Exoplanet Survey Satellite (TESS) provide a good opportunity to study the continuous variations in the light curve of binary stars. This paper reports the discoveries of the correlation between the two maxima on the light curve of KIC 06852488 and the correlation between the O’Connell effect and the O − C curve. The

    更新日期:2020-12-24
  • A Volume-limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
    Astron. J. (IF 5.838) Pub Date : 2020-12-23
    William M. J. Best, Michael C. Liu, Eugene A. Magnier, and Trent J. Dupuy

    We present a new volume-limited sample of L0–T8 dwarfs out to 25 pc defined entirely by parallaxes, using our recent measurements from UKIRT/WFCAM along with Gaia DR2 and literature parallaxes. With 369 members, our sample is the largest parallax-defined volume-limited sample of L and T dwarfs to date, yielding the most precise space densities for such objects. We find the local L0–T8 dwarf population

    更新日期:2020-12-24
  • The Third Data Release of the KODIAQ Survey
    Astron. J. (IF 5.838) Pub Date : 2020-12-23
    John M. O’Meara, Nicolas Lehner, J. Christopher Howk, and J. Xavier Prochaska

    We present and make publicly available the third data release (DR3) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR3 consists of a fully reduced sample of 727 quasars at0.1 < z em < 6.4 observed with the Echellette Sepctrograph and Imager at moderate resolution(4000 ≤ R ≤ 10,000). DR3 contains 872 spectra available in flux calibrated form, representing

    更新日期:2020-12-24
  • The TW Hya Rosetta Stone Project. I. Radial and Vertical Distributions of DCN and DCO +
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    Karin I. Öberg, L. Ilsedore Cleeves, Jennifer B. Bergner, Joseph Cavanaro, Richard Teague, Jane Huang, Ryan A. Loomis, Edwin A. Bergin, Geoffrey A. Blake, Jenny Calahan, Paolo Cazzoletti, Viviana Veloso Guzmán, Michiel R. Hogerheijde, Mihkel Kama, Jeroen Terwisscha van Scheltinga, Chunhua Qi, Ewine van Dishoeck, Catherine Walsh, and David J. Wilner

    Molecular D/H ratios are frequently used to probe the chemical past of solar system volatiles. Yet it is unclear which parts of the solar nebula hosted an active deuterium fractionation chemistry. To address this question, we present 0.″2–0.″4 Atacama Large Millimeter/submillimeter Array (ALMA) observations of DCO + and DCN 2–1, 3–2, and 4–3 toward the nearby protoplanetary disk around TW Hya, taken

    更新日期:2020-12-22
  • The Blue Straggler Population of the Open Clusters Trumpler 5, Trumpler 20, and NGC 2477
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    M. J. Rain, G. Carraro, J. A. Ahumada, S. Villanova, H. Boffin, and L. Monaco

    We present a study based on Gaia DR2 of the population of blue straggler stars in the open clusters Trumpler 5, Trumpler 20, and NGC 2477. All candidates were selected according to their position in the color–magnitude diagram, their proper motion components, and their parallax. We also looked for yellow stragglers, i.e., possible evolved blue stragglers. We found that Trumpler 5 hosts a large blue

    更新日期:2020-12-22
  • ARMADA. I. Triple Companions Detected in B-type Binaries α Del and ν Gem
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    Tyler Gardner, John D. Monnier, Francis C. Fekel, Gail Schaefer, Keith J. C. Johnson, Jean-Baptiste Le Bouquin, Stefan Kraus, Narsireddy Anugu, Benjamin R. Setterholm, Aaron Labdon, Claire L. Davies, Cyprien Lanthermann, Jacob Ennis, Michael Ireland, Kaitlin M. Kratter, Theo Ten Brummelaar, Judit Sturmann, Laszlo Sturmann, Chris Farrington, Douglas R. Gies, Robert Klement, and Fred C. Adams

    Ground-based optical long-baseline interferometry has the power to measure the orbits of close binary systems at ∼10 μ as precision. This precision makes it possible to detect “wobbles” in the binary motion due to the gravitational pull from additional short-period companions. We started the ARrangement for Micro-Arcsecond Differential Astrometry (ARMADA) survey with the Michigan Infra-Red Combiner

    更新日期:2020-12-22
  • Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    Roger E. Cohen, Andrea Bellini, Mattia Libralato, Matteo Correnti, Thomas M. Brown, and Jason S. Kalirai

    This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located toward the inner Milky Way bulge and disk. Here, we focus on internal kinematics of nine GGCs, obtained from space-based imaging over time baselines of >9 yr. We exploit multiple avenues to assess the dynamical state of the target GGCs, constructing radial profiles of projected

    更新日期:2020-12-22
  • The Occurrence of Rocky Habitable-zone Planets around Solar-like Stars from Kepler Data
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    Steve Bryson, Michelle Kunimoto, Ravi K. Kopparapu, Jeffrey L. Coughlin, William J. Borucki, David Koch, Victor Silva Aguirre, Christopher Allen, Geert Barentsen, Natalie M. Batalha, Travis Berger, Alan Boss, Lars A. Buchhave, Christopher J. Burke, Douglas A. Caldwell, Jennifer R. Campbell, Joseph Catanzarite, Hema Chandrasekaran, William J. Chaplin, Jessie L. Christiansen, Jørgen Christensen-Dalsgaard

    We present the occurrence rates for rocky planets in the habitable zones (HZs) of main-sequence dwarf stars based on the Kepler DR25 planet candidate catalog and Gaia-based stellar properties. We provide the first analysis in terms of star-dependent instellation flux, which allows us to track HZ planets. We define η ⊕ as the HZ occurrence of planets with radii between 0.5 and 1.5 R ⊕ orbiting stars

    更新日期:2020-12-22
  • Mutual Detectability: A Targeted SETI Strategy That Avoids the SETI Paradox
    Astron. J. (IF 5.838) Pub Date : 2020-12-22
    Eamonn Kerins

    As our ability to undertake searches for extraterrestrial intelligence (SETI) grows, so does interest in the controversial endeavor of messaging extraterrestrial intelligence (METI). METI proponents point to the SETI Paradox—if all civilizations refrain from METI then SETI is futile. I introduce mutual detectability as a game-theoretic strategy to increase the success potential of targeted SETI. Mutual

    更新日期:2020-12-22
  • β Cephei Pulsations in the High-mass Eclipsing System CW Cephei
    Astron. J. (IF 5.838) Pub Date : 2020-12-16
    Jae Woo Lee and Kyeongsoo Hong

    CW Cep is an early B-type eclipsing binary with mass measurement precisions better than 1%. We report the discovery of pulsation signatures in the Transiting Exoplanet Survey Satellite time-series data of the system observed during Sectors 17 and 18. Our binary modeling indicates that the target star is a partially eclipsing detached system with masses of 12.95 M ⊙ and 11.88 M ⊙ and radii of 5.52 R

    更新日期:2020-12-22
  • The Investigation of Seven Kepler Contact Binaries in the Field of NGC 6819
    Astron. J. (IF 5.838) Pub Date : 2020-12-16
    X.-Z. Li and L. Liu

    Using the Kepler Eclipsing Binary Catalog, we found seven EW-type eclipsing binaries within the tidal radius of the intermediate-aged open cluster NGC 6819 (about 40′). These seven EW eclipsing binaries are all confirmed to be contact binaries by light curve analysis with the 2015 version Wilson–Devinney program. Using the parameter characteristics of contact binaries, we found that only KIC 4937217

    更新日期:2020-12-22
  • Evolution of the Quiescent Disk Surrounding a Superoutburst of the Dwarf Nova TW Virginis
    Astron. J. (IF 5.838) Pub Date : 2020-12-16
    Zhibin Dai, Paula Szkody, and Peter M. Garnavich

    In this paper, we investigate portions of the Kepler K2 Short Cadence light curve of the dwarf nova (DN) TW Vir at quiescence, using light-curve modeling. The light curve was separated into 24 sections, each with a data length of ∼0.93 days, comprising 4 sections before, and 20 after a superoutburst (SO). Due to morphological differences, the quiescent orbital modulation is classified into three types

    更新日期:2020-12-22
  • On the Diversity of Asymmetries in Gapped Protoplanetary Disks
    Astron. J. (IF 5.838) Pub Date : 2020-12-16
    Nienke van der Marel, Til Birnstiel, Antonio Garufi, Enrico Ragusa, Valentin Christiaens, Daniel J. Price, Steph Sallum, Dhruv Muley, Logan Francis, and Ruobing Dong

    Protoplanetary disks with large inner dust cavities are thought to host massive planetary or substellar companions. These disks show asymmetries and rings in the millimeter continuum caused by dust trapping in pressure bumps and potentially vortices or horseshoes. The origin of the asymmetries and their diversity remains unclear. We present a comprehensive study of 16 disks for which the gas surface

    更新日期:2020-12-22
  • Eccentricity Driven Climate Effects in the Kepler-1649 System
    Astron. J. (IF 5.838) Pub Date : 2020-12-15
    Stephen R. Kane, Zhexing Li, Eric T. Wolf, Colby Ostberg, and Michelle L. Hill

    The discovery of terrestrial exoplanets is uncovering increasingly diverse architectures. Of particular interest are those systems that contain exoplanets at a variety of star–planet separations, allowing direct comparison of exoplanet evolution (comparative planetology). The Kepler-1649 system contains two terrestrial planets similar both in size and insolation flux to Venus and Earth, although their

    更新日期:2020-12-16
  • PoPE: A Population-based Approach to Model the Spatial Structure of Astronomical Systems
    Astron. J. (IF 5.838) Pub Date : 2020-12-15
    Arya Farahi, Daisuke Nagai, and Yang Chen

    We present a novel population-based Bayesian inference approach to model the average and population variance of the spatial distribution of a set of observables from ensemble analysis of low signal-to-noise-ratio measurements. The method consists of (1) inferring the average profile using Gaussian processes and (2) computing the covariance of the profile observables given a set of independent variables

    更新日期:2020-12-16
  • EXPRES. II. Searching for Planets around Active Stars: A Case Study of HD 101501
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Samuel H. C. Cabot, Rachael M. Roettenbacher, Gregory W. Henry, Lily Zhao, Robert O. Harmon, Debra A. Fischer, John M. Brewer, Joe Llama, Ryan R. Petersburg, and Andrew E. Szymkowiak

    By controlling instrumental errors to below 10 cm s −1 , the EXtreme PREcision Spectrograph (EXPRES) allows for a more insightful study of photospheric velocities that can mask weak Keplerian signals. Gaussian processes (GP) have become a standard tool for modeling correlated noise in radial velocity data sets. While GPs are constrained and motivated by physical properties of the star, in some cases

    更新日期:2020-12-13
  • ELT Imaging of MWC 297 from the 23 m LBTI: Complex Disk Structure and a Companion Candidate
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    S. Sallum, J. A. Eisner, J. M. Stone, J. Dietrich, P. Hinz, and E. Spalding

    Herbig Ae/Be stars represent the early outcomes of star formation and the initial stages of planet formation at intermediate stellar masses. Understanding both of these processes requires detailed characterization of their disk structures and companion frequencies. We present new 3.7 μm imaging of the Herbig Be star MWC 297 from nonredundant masking observations on the phase-controlled, 23 m Large

    更新日期:2020-12-13
  • KIC 10975348: A Double-mode or Triple-mode High-amplitude δ Scuti Star?
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Tao-Zhi Yang, Xiao-Ya Sun, Zhao-Yu Zuo, and Hai-Wen Liu

    In this paper, we analyze the light variations of KIC 10975348 using photometric data delivered from the Kepler mission. This star is exceptionally faint ( K p = 18.6 mag) compared to most well-studied δ Scuti stars. The Fourier analysis of the short-cadence data (i.e., Q14, Q15, and Q16, spanning 220 days) reveals that the variations are dominated by the strongest mode with a frequency of F0 = 10

    更新日期:2020-12-13
  • A Method to Extract Spatially Resolved Polycyclic Aromatic Hydrocarbon Emission from Spitzer Spectra: Application to M51
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Lulu Zhang, Luis C. Ho, and Yanxia Xie

    The mid-infrared spectrum contains rich diagnostics to probe the physical properties of galaxies, among which the pervasive emission features from polycyclic aromatic hydrocarbons (PAHs) offer promising means of estimating the star formation rate (SFR) relatively immune from dust extinction. This paper investigates the effectiveness of PAH emission as a SFR indicator on subkiloparsec scales by studying

    更新日期:2020-12-13
  • TOI 540 b: A Planet Smaller than Earth Orbiting a Nearby Rapidly Rotating Low-mass Star
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Kristo Ment, Jonathan Irwin, David Charbonneau, Jennifer G. Winters, Amber Medina, Ryan Cloutier, Matías R. Díaz, James S. Jenkins, Carl Ziegler, Nicholas Law, Andrew W. Mann, George Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Robert F. Goeke, Alan M. Levine, Bárbara Rojas-Ayala, Pamela Rowden, Eric B. Ting, and Joseph D. Twicken

    We present the discovery of TOI 540 b, a hot planet slightly smaller than Earth orbiting the low-mass star 2MASS J05051443-4756154. The planet has an orbital period of P = 1.239149 days (±170 ms) and a radius of ##IMG## [http://ej.iop.org/images/1538-3881/161/1/23/ajabbd91ieqn1.gif] {$r=0.903\pm 0.052{R}_{\oplus }$} , and is likely terrestrial based on the observed mass–radius distribution of small

    更新日期:2020-12-13
  • On the Estimation of Circumbinary Orbital Properties
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Benjamin C. Bromley and Scott J. Kenyon

    We describe a fast, approximate method to characterize the orbits of satellites around a central binary in numerical simulations. A goal is to distinguish the free eccentricity—the random motion of a satellite relative to a dynamically cool orbit—from oscillatory modes driven by the central binary’s time-varying gravitational potential. We assess the performance of the method using the Kepler-16, Kepler-47

    更新日期:2020-12-13
  • Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
    Astron. J. (IF 5.838) Pub Date : 2020-12-11
    Steven Giacalone, Courtney D. Dressing, Eric L. N. Jensen, Karen A. Collins, George R. Ricker, Roland Vanderspek, S. Seager, Joshua N. Winn, Jon M. Jenkins, Thomas Barclay, Khalid Barkaoui, Charles Cadieux, David Charbonneau, Kevin I. Collins, Dennis M. Conti, René Doyon, Phil Evans, Mourad Ghachoui, Michaël Gillon, Natalia M. Guerrero, Rhodes Hart, Emmanuël Jehin, John F. Kielkopf, Brian McLean, Felipe

    We present TRICERATOPS , a new Bayesian tool that can be used to vet and validate TESS Objects of Interest (TOIs). We test the tool on 68 TOIs that have been previously confirmed as planets or rejected as astrophysical false positives. By looking in the false-positive probability (FPP)−nearby false-positive probability (NFPP) plane, we define criteria that TOIs must meet to be classified as validated

    更新日期:2020-12-13
  • First Detection of Orbital Motion for HD 106906 b: A Wide-separation Exoplanet on a Planet Nine–like Orbit
    Astron. J. (IF 5.838) Pub Date : 2020-12-10
    Meiji M. Nguyen, Robert J. De Rosa, and Paul Kalas

    HD 106906 is a 15 Myr old short-period (49 days) spectroscopic binary that hosts a wide-separation (737 au) planetary-mass ( ##IMG## [http://ej.iop.org/images/1538-3881/161/1/22/ajabc012ieqn1.gif] {$\sim 11\,{M}_{\mathrm{Jup}}$} ) common proper motion companion, HD 106906 b. Additionally, a circumbinary debris disk is resolved at optical and near-infrared wavelengths that exhibits a significant asymmetry

    更新日期:2020-12-13
  • ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera
    Astron. J. (IF 5.838) Pub Date : 2020-12-09
    Gloria Guilluy, Amélie Gressier, Sam Wright, Alexandre Santerne, Adam Yassin Jaziri, Billy Edwards, Quentin Changeat, Darius Modirrousta-Galian, Nour Skaf, Ahmed Al-Refaie, Robin Baeyens, Michelle Fabienne Bieger, Doriann Blain, Flavien Kiefer, Mario Morvan, Lorenzo V. Mugnai, William Pluriel, Mathilde Poveda, Tiziano Zingales, Niall Whiteford, Kai Hou Yip, Benjamin Charnay, Jérémy Leconte, Pierre

    We present an atmospheric characterization study of two medium-sized planets bracketing the radius of Neptune: HD 106315c ( R P = 4.98 ± 0.23 R ⊕ ) and HD 3167c ( ##IMG## [http://ej.iop.org/images/1538-3881/161/1/19/ajabc3c8ieqn1.gif] {${R}_{{\rm{P}}}={2.740}_{-0.100}^{+0.106}$} R ⊕ ). We analyze spatially scanned spectroscopic observations obtained with the G141 grism (1.125–1.650 μ m) of the Wide

    更新日期:2020-12-09
  • Double Image Polarimeter—Ultra Fast: Simultaneous Three-color ( BV R ) Polarimeter with Electron-multiplying Charge-coupled Devices
    Astron. J. (IF 5.838) Pub Date : 2020-12-09
    Vilppu Piirola, Ilia A. Kosenkov, Andrei V. Berdyugin, Svetlana V. Berdyugina, and Juri Poutanen

    We describe a new instrument capable of high-precision (10 −5 ) polarimetric observations simultaneously in three passbands ( BVR ). The instrument utilizes electron-multiplying charge-coupled device (EM CCD) cameras for high efficiency and fast image readout. The key features of the Double Image Polarimeter—Ultra Fast (DIPol-UF) are: (i) the optical design with high throughput and inherent stability;

    更新日期:2020-12-09
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