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  • Hidden Worlds: Dynamical Architecture Predictions of Undetected Planets in Multi-planet Systems and Applications to TESS Systems
    Astron. J. (IF 5.838) Pub Date : 2020-08-11
    Jeremy Dietrich and Dániel Apai

    Multi-planet systems produce a wealth of information for exoplanet science, but our understanding of planetary architectures is incomplete. Probing these systems further will provide insight into orbital architectures and formation pathways. Here we present a model to predict previously undetected planets in these systems via population statistics. The model considers both transiting and non-transiting

    更新日期:2020-08-12
  • The Gaia–Kepler Stellar Properties Catalog. II. Planet Radius Demographics as a Function of Stellar Mass and Age
    Astron. J. (IF 5.838) Pub Date : 2020-08-11
    Travis A. Berger, Daniel Huber, Eric Gaidos, Jennifer L. van Saders, and Lauren M. Weiss

    Studies of exoplanet demographics require large samples and precise constraints on exoplanet host stars. Using the homogeneous Kepler stellar properties derived using the Gaia Data Release 2 by Berger et al., we recompute Kepler planet radii and incident fluxes and investigate their distributions with stellar mass and age. We measure the stellar mass dependence of the planet radius valley to be ##IMG##

    更新日期:2020-08-12
  • ARES. II. Characterizing the Hot Jupiters WASP-127 b, WASP-79 b, and WASP-62b with the Hubble Space Telescope
    Astron. J. (IF 5.838) Pub Date : 2020-08-11
    Nour Skaf, Michelle Fabienne Bieger, Billy Edwards, Quentin Changeat, Mario Morvan, Flavien Kiefer, Doriann Blain, Tiziano Zingales, Mathilde Poveda, Ahmed Al-Refaie, Robin Baeyens, Amélie Gressier, Gloria Guilluy, Adam Yassin Jaziri, Darius Modirrousta-Galian, Lorenzo V. Mugnai, William Pluriel, Niall Whiteford, Sam Wright, Kai Hou Yip, Benjamin Charnay, Jérémy Leconte, Pierre Drossart, Angelos Tsiaras

    This paper presents the atmospheric characterization of three large, gaseous planets: WASP-127 b, WASP-79 b, and WASP-62 b. We analyzed spectroscopic data obtained with the G141 grism (1.088–1.68 μ m) of the Wide Field Camera 3 on board the Hubble Space Telescope using the Iraclis pipeline and the TauREx3 retrieval code, both of which are publicly available. For WASP-127 b, which is the least dense

    更新日期:2020-08-12
  • Modeling the Chronologies and Size Distributions of Ceres and Vesta Craters
    Astron. J. (IF 5.838) Pub Date : 2020-08-11
    F. Roig and D. Nesvorný

    We infer the crater chronologies of Ceres and Vesta from a self-consistent dynamical model of asteroid impactors. The model accounts for planetary migration/instability early in the history of our solar system and tracks asteroid orbits over 4.56 Gyr. It is calibrated on the current population of the asteroid belt. The model provides the number of asteroid impacts on different worlds at any time throughout

    更新日期:2020-08-12
  • Modeling Radial Velocity Data of Resonant Planets to Infer Migration Histories
    Astron. J. (IF 5.838) Pub Date : 2020-08-11
    Sam Hadden and Matthew J. Payne

    A number of giant-planet pairs with period ratios ≲2 discovered by the radial velocity (RV) method may reside in mean motion resonances. Convergent orbital migration and resonant capture at the time of formation would naturally explain the present-day resonant orbital configurations of these systems. Planets that experience smooth migration and eccentricity-damping forces due to a protoplanetary disk

    更新日期:2020-08-12
  • Stellar Oblateness versus Distant Giants in Exciting Kepler Planet Mutual Inclinations
    Astron. J. (IF 5.838) Pub Date : 2020-08-06
    Christopher Spalding and Sarah C. Millholland

    An overabundance of single-transiting Kepler planets suggests the existence of a subpopulation of intrinsically multiplanet systems possessing large mutual inclinations. However, the origin of these mutual inclinations remains unknown. Recent work has demonstrated that mutual inclinations can be excited soon after protoplanetary disk dispersal owing to the oblateness of the rapidly rotating host star

    更新日期:2020-08-10
  • A Multiwavelength Study of the Cool Core Cluster MACS J1447.4+0827
    Astron. J. (IF 5.838) Pub Date : 2020-08-06
    M. Prasow-Émond, J. Hlavacek-Larrondo, C. L. Rhea, M. Latulippe, M.-L. Gendron-Marsolais, A. Richard-Laferrière, J. S. Sanders, A. C. Edge, S. W. Allen, A. Mantz, and A. von der Linden

    Clusters of galaxies are outstanding laboratories for understanding the physics of supermassive black hole (SMBH) feedback. Here we present the first Chandra, Karl G. Jansky Very Large Array, and Hubble Space Telescope analysis of MACS J1447.4+0827 ( z = 0.3755), one of the strongest cool core clusters known, in which extreme feedback from its central SMBH is needed to prevent the hot intracluster

    更新日期:2020-08-10
  • Time-sequence Spectroscopy of Epsilon CrA: The 518 nm Mg i Triplet Region Analyzed with Broadening Functions
    Astron. J. (IF 5.838) Pub Date : 2020-08-06
    Slavek M. Rucinski

    High-resolution spectroscopic observations of the W UMa-type binary ϵ CrA obtained as a time-monitoring sequence on four full and four partial nights within two weeks have been used to derive orbital elements of the system and discuss the validity of the Lucy model for description of the radial-velocity data. The observations had more extensive temporal coverage and better quality than similar time-sequence

    更新日期:2020-08-10
  • The Hubble Space Telescope's Near-UV and Optical Transmission Spectrum of Earth as an Exoplanet
    Astron. J. (IF 5.838) Pub Date : 2020-08-05
    Allison Youngblood, Giada N. Arney, Antonio García Muñoz, John T. Stocke, Kevin France, and Aki Roberge

    We observed the 2019 January total lunar eclipse with the Hubble Space Telescope’s STIS spectrograph to obtain the first near-UV (1700–3200 Å) observation of Earth as a transiting exoplanet. The observatories and instruments that will be able to perform transmission spectroscopy of exo-Earths are beginning to be planned, and characterizing the transmission spectrum of Earth is vital to ensuring that

    更新日期:2020-08-06
  • Characterization of the Atmosphere of Super-Earth 55 Cancri e Using High-resolution Ground-based Spectroscopy
    Astron. J. (IF 5.838) Pub Date : 2020-08-05
    Abhinav Jindal, Ernst J. W. de Mooij, Ray Jayawardhana, Emily K. Deibert, Matteo Brogi, Zafar Rustamkulov, Jonathan J. Fortney, Callie E. Hood, and Caroline V. Morley

    The nearby super-Earth 55 Cnc e orbits a bright ( V = 5.95 mag) star with a period of ∼18 hr and a mass of ∼8 M ⊕ . Its atmosphere may be water-rich and have a large-scale height; though, attempts to characterize it have yielded ambiguous results. Here we present a sensitive search for water and TiO in its atmosphere at high spectral resolution using the Gemini North telescope and the GRACES spectrograph

    更新日期:2020-08-06
  • Fine Structures in the Main Sequence Revealed by Gaia Data Release 2
    Astron. J. (IF 5.838) Pub Date : 2020-08-05
    Wei-Chun Jao and Gregory A. Feiden

    The Hertzsprung–Russell diagram (HRD) is fully examined using the Fourier analysis. This work shows more stars are above the gap in the lower main sequence than below it, and this implies that stars spend more time above the gap while they undergo variability associated with the 3 He instability. The enhanced HRD also shows the width of the gap is not linear and depends on the ##IMG## [http://ej.iop

    更新日期:2020-08-06
  • Dynamical Instabilities in Systems of Multiple Short-period Planets Are Likely Driven by Secular Chaos: A Case Study of Kepler-102
    Astron. J. (IF 5.838) Pub Date : 2020-08-03
    Kathryn Volk and Renu Malhotra

    We investigated the dynamical stability of high-multiplicity Kepler and K2 planetary systems. Our numerical simulations find instabilities in ~20% of the cases on a wide range of timescales (up to 5 × 10 9 orbits) and over an unexpectedly wide range of initial dynamical spacings. To identify the triggers of long-term instability in multiplanet systems, we investigated in detail the five-planet Kepler-102

    更新日期:2020-08-04
  • An Astrometric Planetary Companion Candidate to the M9 Dwarf TVLM 513–46546
    Astron. J. (IF 5.838) Pub Date : 2020-08-03
    Salvador Curiel, Gisela N. Ortiz-León, Amy J. Mioduszewski, and Rosa M. Torres

    Astrometric observations of the M9 dwarf TVLM 513–46546 taken with the VLBA reveal an astrometric signature consistent with a period of 221 ± 5 days. The orbital fit implies that the companion has a mass m p = 0.35−0.42 M J , a circular orbit ( e  0), a semimajor axis a = 0.28−0.31 au, and an inclination angle i = 71°−88°. The detected companion, TVLM 513 b , is one of the few giant-mass planets found

    更新日期:2020-08-04
  • Random Forests Applied to High-precision Photometry Analysis with Spitzer IRAC
    Astron. J. (IF 5.838) Pub Date : 2020-08-03
    Jessica E. Krick, Jonathan Fraine, Jim Ingalls, and Sinan Deger

    We present a new method employing machine-learning techniques for measuring astrophysical features by correcting systematics in IRAC high-precision photometry using random forests. The main systematic in IRAC light-curve data is position changes due to unavoidable telescope motions coupled with an intrapixel response function. We aim to use the large amount of publicly available calibration data for

    更新日期:2020-08-04
  • TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet
    Astron. J. (IF 5.838) Pub Date : 2020-08-02
    Johanna Teske, Matías R. Díaz, Rafael Luque, Teo Močnik, Julia V. Seidel, Jon Fernández Otegi, Fabo Feng, James S. Jenkins, Enric Pallè, Damien Ségransan, Stèphane Udry, Karen A. Collins, Jason D. Eastman, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, David. R. Anderson, Thomas Barclay, François Bouchy, Jennifer A. Burt, R. Paul Butler, Douglas A

    The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≈4 days) transiting planet around the bright ( V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (∼1600 days) giant planet. HD 86226c (TOI-652.01) has a radius

    更新日期:2020-08-03
  • Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Jon K. Zink, Kevin K. Hardegree-Ullman, Jessie L. Christiansen, Erik A. Petigura, Courtney D. Dressing, Joshua E. Schlieder, David R. Ciardi, and Ian J. M. Crossfield

    Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Implementing a broken power law for both the period and radius distributions, we find an overall planet occurrence of ##IMG## [http://ej.iop.org/images/1538-3881/160/2/94/ajaba123ieqn1

    更新日期:2020-07-31
  • The Structure of Stellar Disks in Isolated Lenticular Galaxies
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Olga K. Sil’chenko, Alexei Yu. Kniazev, and Ekaterina M. Chudakova

    We have obtained imaging data in two photometric bands, g and r , for a sample of 42 isolated lenticular galaxies with the Las Cumbres Observatory 1 m telescope network. We have analyzed the structure of their large-scale stellar disks. The parameters of surface-brightness distributions have been determined including the radial profile shapes and disk thicknesses. After inspecting the radial brightness

    更新日期:2020-07-31
  • Physical Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Man-To Hui, Quan-Zhi Ye, Dora Föhring, Denise Hung, and David J. Tholen

    We present a study of interstellar comet 2I/2019 Q4 (Borisov) using both preperihelion and postperihelion observations spanning late September 2019 through late January 2020. The intrinsic brightness of the comet was observed to continuously decline throughout the timespan, likely due to the decreasing effective scattering cross-section as a result of volatile sublimation with a slope of −0.43 ± 0

    更新日期:2020-07-31
  • Observations of Disintegrating Long-period Comet C/2019 Y4 (ATLAS): A Sibling of C/1844 Y1 (Great Comet)
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Man-To Hui and Quan-Zhi Ye

    We present a study of C/2019 Y4 (ATLAS) using Sloan gri observations from 2020 mid-January to early April. During this time span, the comet brightened with a growth in the effective cross-section of ##IMG## [http://ej.iop.org/images/1538-3881/160/2/91/ajab9d81ieqn1.gif] {$\left(2.0\pm 0.1\right)\times {10}^{2}$} m 2 s −1 from the beginning to ∼70 days preperihelion in late 2020 March, followed by a

    更新日期:2020-07-31
  • Exploring the Evolution of Stellar Rotation Using Galactic Kinematics
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Ruth Angus, Angus Beane, Adrian M. Price-Whelan, Elisabeth Newton, Jason L. Curtis, Travis Berger, Jennifer van Saders, Rocio Kiman, Daniel Foreman-Mackey, Yuxi (Lucy) Lu, Lauren Anderson, and Jacqueline K. Faherty

    The rotational evolution of cool dwarfs is poorly constrained after ∼1–2 Gyr due to a lack of precise ages and rotation periods for old main-sequence stars. In this work, we use velocity dispersion as an age proxy to reveal the temperature-dependent rotational evolution of low-mass Kepler dwarfs and demonstrate that kinematic ages could be a useful tool for calibrating gyrochronology in the future

    更新日期:2020-07-31
  • Search for TiO and Optical Nightside Emission from the Exoplanet WASP-33b
    Astron. J. (IF 5.838) Pub Date : 2020-07-30
    Miranda K. Herman, Ernst J. W. de Mooij, Ray Jayawardhana, and Matteo Brogi

    With a temperature akin to an M dwarf, WASP-33b is among the hottest Jupiters known, making it an ideal target for high-resolution optical spectroscopy. By analyzing both transmission and emission spectra, we aim to substantiate previous reports of atmospheric TiO and a thermal inversion within the planet’s atmosphere. We observed two transits and six arcs of the phase curve with the Echelle SpectroPolarimetric

    更新日期:2020-07-31
  • Two Views of the Radius Gap and the Role of Light Curve Fitting
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    Erik A. Petigura

    Recently, several groups have resolved a gap that bifurcates planets between the size of Earth and Neptune into two populations. The location and depth of this feature is an important signature of the physical processes that form and sculpt planets. In particular, planets residing in the radius gap are valuable probes of these processes as they may be undergoing the final stages of envelope loss. Here

    更新日期:2020-07-30
  • PTFO 8-8695: Two Stars, Two Signals, No Planet
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    L. G. Bouma, J. N. Winn, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. M. Jenkins, T. Barclay, K. A. Collins, J. P. Doty, D. R. Louie, S. N. Quinn, M. E. Rose, J. C. Smith, J. Villaseñor, and B. Wohler

    PTFO 8-8695 (CVSO 30) is a star in the 7–10 million year old Orion OB1a cluster that shows brightness dips that resemble planetary transits. Although strong evidence against the planet hypothesis has been presented, the possibility remains debated in the literature. To obtain further clues, we inspected data from the NASA Transiting Exoplanet Survey Satellite (TESS) and the ESA Gaia mission. The Gaia

    更新日期:2020-07-30
  • The −12 mag Dip in the Galaxy Luminosity Function of Hickson Compact Groups
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    Hitomi Yamanoi, Masafumi Yagi, Yutaka Komiyama, and Jin Koda

    We present the galaxy luminosity functions (LFs) of four Hickson Compact Groups using image data from the Subaru Hyper Suprime-Cam. A distinct dip appeared in the faint ends of all the LFs at M g ∼ −12. A similar dip was observed in the LFs of the galaxy clusters Coma and Centaurus. However, LFs in the Virgo, Hydra, and the field had flatter slopes and no dips. As the relative velocities among galaxies

    更新日期:2020-07-30
  • A Pluto–Charon Concerto: An Impact on Charon as the Origin of the Small Satellites
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    Benjamin C. Bromley and Scott J. Kenyon

    We consider a scenario where the small satellites of Pluto and Charon grew within a disk of debris from an impact between Charon and a trans-Neptunian object (TNO). After Charon’s orbital motion boosts the debris into a disk-like structure, rapid orbital damping of meter-sized or smaller objects is essential to prevent the subsequent reaccretion or dynamical ejection by the binary. From analytical

    更新日期:2020-07-30
  • Exploring the Atmospheric Dynamics of the Extreme Ultrahot Jupiter KELT-9b Using TESS Photometry
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    Ian Wong, Avi Shporer, Daniel Kitzmann, Brett M. Morris, Kevin Heng, H. Jens Hoeijmakers, Brice-Olivier Demory, John P. Ahlers, Megan Mansfield, Jacob L. Bean, Tansu Daylan, Tara Fetherolf, Joseph E. Rodriguez, Björn Benneke, George R. Ricker, David W. Latham, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Christopher J. Burke, Jessie L. Christiansen, Zahra Essack, Mark E. Rose, Jeffrey

    We carry out a phase-curve analysis of the KELT-9 system using photometric observations from NASA’s Transiting Exoplanet Survey Satellite (TESS). The measured secondary eclipse depth and peak-to-peak atmospheric brightness modulation are ##IMG## [http://ej.iop.org/images/1538-3881/160/2/88/ajaba2cbieqn1.gif] {${650}_{-15}^{+14}$} and 566 ± 16 ppm, respectively. The planet’s brightness variation reaches

    更新日期:2020-07-30
  • Analytic Stability Maps of Unknown Exoplanet Companions for Imaging Prioritization
    Astron. J. (IF 5.838) Pub Date : 2020-07-29
    Carlos Gascón, Dmitry Savransky, and Miquel Sureda

    Identifying which systems are more likely to host an imageable planet can play an important role in the construction of an optimized target list for future direct imaging missions, such as the planned Coronagraph Instrument (CGI) technology demonstration for the Nancy Grace Roman Space Telescope. For single-planet systems, the presence of an already detected exoplanet can severely restrict the target’s

    更新日期:2020-07-30
  • The Sixth Data Release of the Radial Velocity Experiment (R AVE ). I. Survey Description, Spectra, and Radial Velocities
    Astron. J. (IF 5.838) Pub Date : 2020-07-26
    Matthias Steinmetz, Gal Matijevič, Harry Enke, Tomaž Zwitter, Guillaume Guiglion, Paul J. McMillan, Georges Kordopatis, Marica Valentini, Cristina Chiappini, Luca Casagrande, Jennifer Wojno, Borja Anguiano, Olivier Bienaymé, Albert Bijaoui, James Binney, Donna Burton, Paul Cass, Patrick de Laverny, Kristin Fiegert, Kenneth Freeman, Jon P. Fulbright, Brad K. Gibson, Gerard Gilmore, Eva K. Grebel, Amina

    The Radial Velocity Experiment (R ave ) is a magnitude-limited(9 < I < 12) spectroscopic survey of Galactic stars randomly selected in Earth’s southern hemisphere. The R ave medium-resolution spectra ( R ∼ 7500) cover the Ca-triplet region (8410–8795 Å). The sixth and final data release (DR6) is based on 518,387 observations of 451,783 unique stars. R ave observations were taken between 2003 April

    更新日期:2020-07-27
  • Alfnoor: A Retrieval Simulation of the Ariel Target List
    Astron. J. (IF 5.838) Pub Date : 2020-07-26
    Q. Changeat, A. Al-Refaie, L. V. Mugnai, B. Edwards, I. P. Waldmann, E. Pascale, and G. Tinetti

    In this work, we present Alfnoor, a dedicated tool optimized for population studies of exoplanet atmospheres. Alfnoor combines the latest version of the retrieval algorithm, TauREx 3, with the instrument noise simulator ArielRad and enables the simultaneous retrieval analysis of a large sample of exo-atmospheres. We applied this tool to the Ariel list of planetary candidates and focus on hydrogen dominated

    更新日期:2020-07-27
  • The Sixth Data Release of the Radial Velocity Experiment (R ave ). II. Stellar Atmospheric Parameters, Chemical Abundances, and Distances
    Astron. J. (IF 5.838) Pub Date : 2020-07-26
    Matthias Steinmetz, Guillaume Guiglion, Paul J. McMillan, Gal Matijevič, Harry Enke, Georges Kordopatis, Tomaž Zwitter, Marica Valentini, Cristina Chiappini, Luca Casagrande, Jennifer Wojno, Borja Anguiano, Olivier Bienaymé, Albert Bijaoui, James Binney, Donna Burton, Paul Cass, Patrick de Laverny, Kristin Fiegert, Kenneth Freeman, Jon P. Fulbright, Brad K. Gibson, Gerard Gilmore, Eva K. Grebel, Amina

    We present part 2 of the sixth and final Data Release (DR6) of the Radial Velocity Experiment (R ave ), a magnitude-limited ( ##IMG## [http://ej.iop.org/images/1538-3881/160/2/83/ajab9ab8ieqn1.gif] {$9\lt I\lt 12$} ) spectroscopic survey of Galactic stars randomly selected in Earth’s southern hemisphere. The R ave medium-resolution spectra ( R ∼ 7500) cover the Ca triplet region (8410–8795 Å) and span

    更新日期:2020-07-27
  • Dynamical Packing in the Habitable Zone: The Case of Beta CVn
    Astron. J. (IF 5.838) Pub Date : 2020-07-26
    Stephen R. Kane, Margaret C. Turnbull, Benjamin J. Fulton, Lee J. Rosenthal, Andrew W. Howard, Howard Isaacson, Geoffrey W. Marcy, and Lauren M. Weiss

    Uncovering the occurrence rate of terrestrial planets within the habitable zone (HZ) of their host stars has been a particular focus of exoplanetary science in recent years. The statistics of these occurrence rates have largely been derived from transiting planet discoveries, and have uncovered numerous HZ planets in compact systems around M-dwarf host stars. Here we explore the width of the HZ as

    更新日期:2020-07-27
  • OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Yuki Hirao, David P. Bennett, Yoon-Hyun Ryu, Naoki Koshimoto, Andrzej Udalski, Jennifer C. Yee, Takahiro Sumi, Ian A. Bond, Yossi Shvartzvald, Fumio Abe, Richard K. Barry, Aparna Bhattacharya, Martin Donachie, Akihiko Fukui, Yoshitaka Itow, Iona Kondo, Man Cheung Alex Li, Yutaka Matsubara, Taro Matsuo, Shota Miyazaki, Yasushi Muraki, Masayuki Nagakane, Clément Ranc, Nicholas J. Rattenbury, Haruno Suematsu

    We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of ##IMG## [http://ej

    更新日期:2020-07-23
  • Spectral Variability of VHS J1256–1257b from 1 to 5 μ m
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Yifan Zhou, Brendan P. Bowler, Caroline V. Morley, Dániel Apai, Tiffany Kataria, Marta L. Bryan, and Björn Benneke

    Multiwavelength time-resolved observations of rotationally modulated variability from brown dwarfs and giant exoplanets are the most effective method for constraining their heterogeneous atmospheric structures. In a companion paper, we reported the discovery of strong near-infrared variability in HST/WFC3/G141 light curves of the very red L-dwarf companion VHS J1256–1257b. In this paper, we present

    更新日期:2020-07-23
  • The Role of Outflows, Radiation Pressure, and Magnetic Fields in Massive Star Formation
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Anna L. Rosen and Mark R. Krumholz

    Stellar feedback in the form of radiation pressure and magnetically driven collimated outflows may limit the maximum mass that a star can achieve and affect the star formation efficiency of massive prestellar cores. Here we present a series of 3D adaptive mesh refinement radiation–magnetohydrodynamic simulations of the collapse of initially turbulent, massive prestellar cores. Our simulations include

    更新日期:2020-07-23
  • WIYN Open Cluster Study. LXXXI. Caught in the Act? The Peculiar Red Giant NGC 2243-W2135
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Barbara J. Anthony-Twarog, Constantine P. Deliyannis, and Bruce A. Twarog

    High-dispersion spectra for giants through turnoff stars in the Li 6708 Å region have been obtained and analyzed in the old, metal-deficient open cluster, NGC 2243. When combined with high-dispersion data from other surveys, the cluster is found to contain a uniquely peculiar star at the luminosity level of the red clump. The giant is the reddest star at its luminosity, exhibits variability at a minimum

    更新日期:2020-07-23
  • TIC 278956474: Two Close Binaries in One Young Quadruple System Identified by TESS
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Pamela Rowden, Tamás Borkovits, Jon M. Jenkins, Keivan G. Stassun, Joseph D. Twicken, Elisabeth R. Newton, Carl Ziegler, Coel Hellier, Aylin Garcia Soto, Elisabeth C. Matthews, Ulrich Kolb, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Luke G. Bouma, César Briceño, David Charbonneau, William Fong, Ana Glidden, Natalia M. Guerrero, Nicholas Law, Andrew W. Mann, Mark

    We have identified a quadruple system with two close eclipsing binaries in Transiting Exoplanet Survey Satellite (TESS) data. The object is unresolved in Gaia and appears as a single source at parallax 1.08 ± 0.01 mas. Both binaries have observable primary and secondary eclipses and were monitored throughout TESS Cycle 1 (sectors 1–13), falling within the TESS Continuous Viewing Zone. In one eclipsing

    更新日期:2020-07-23
  • Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Pauline Arriaga, Michael P. Fitzgerald, Gaspard Duchêne, Paul Kalas, Maxwell A. Millar-Blanchaer, Marshall D. Perrin, Christine H. Chen, Johan Mazoyer, Mark Ammons, Vanessa P. Bailey, Trafis S. Barman, Joanna Bulger, Jeffrey K. Chilcote, Tara Cotten, Robert J. De Rosa, Rene Doyon, Thomas M. Esposito, Katherine B. Follette, Benjamin L. Gerard, Stephen Goodsell, James R. Graham, Alexandra Z. Greenbaum

    HR4796A hosts a well-studied debris disk with a long history due to its high fractional luminosity and favorable inclination, which facilitate both unresolved and resolved observations. We present new J - and K 1 -band images of the resolved debris disk HR4796A taken in the polarimetric mode of the Gemini Planet Imager (GPI). The polarized intensity features a strongly forward-scattered brightness

    更新日期:2020-07-23
  • The Asteroid Rotation Period Survey Using the China Near-Earth Object Survey Telescope (CNEOST)
    Astron. J. (IF 5.838) Pub Date : 2020-07-22
    Ting-Shuo Yeh, Bin Li, Chan-Kao Chang, Hai-Bin Zhao, Jiang-Hui Ji, Zhong-Yi Lin, and Wing-Huen Ip

    We initiated the bilateral collaboration between the Lulin Observatory and the Purple Mountain Observatory to collect asteroid lightcurves using the Chinese Near-Earth Object Survey Telescope at the Xuyi Observation Station. The primary goal of this collaboration was to discover super-fast rotators (SFRs) and study their physical properties. Two campaigns have been conducted: (a) a survey of ∼45 deg

    更新日期:2020-07-23
  • Using the Baryonic Tully–Fisher Relation to Measure H o
    Astron. J. (IF 5.838) Pub Date : 2020-07-16
    James Schombert, Stacy McGaugh, and Federico Lelli

    We explore the use of the baryonic Tully–Fisher relation (bTFR) as a new distance indicator. Advances in near-IR imaging and stellar population models, plus precise rotation curves, have reduced the scatter in the bTFR such that distance is the dominant source of uncertainty. Using 50 galaxies with accurate distances from Cepheids or the tip magnitude of the red giant branch, we calibrate the bTFR

    更新日期:2020-07-17
  • A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
    Astron. J. (IF 5.838) Pub Date : 2020-07-16
    David P. Bennett, Andrzej Udalski, Ian A. Bond, Fumio Abe, Richard K. Barry, Aparna Bhattacharya, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Kohei Kawasaki, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Hikaru Shoji, Takahiro Sumi, Daisuke Suzuki

    We present the analysis of microlensing event OGLE-2006-BLG-284, which has a lens system that consists of two stars and a gas giant planet with a mass ratio of q p = (1.26 ± 0.19) × 10 −3 to the primary. The mass ratio of the two stars is q s = 0.289 ± 0.011, and their projected separation is s s = 2.1 ± 0.7 au, while the projected separation of the planet from the primary is s p = 2.2 ± 0.8 au. For

    更新日期:2020-07-17
  • Spectroscopic Orbits of Subsystems in Multiple Stars. VII.
    Astron. J. (IF 5.838) Pub Date : 2020-07-16
    Andrei Tokovinin

    Spectroscopic orbits of main-sequence stars HIP 3150A, 6873B, 11537A, 22531A, 22534B, 31089B, 49336A, 104833C, and 107731A belonging to eight multiple systems are determined from high-resolution spectra taken with CHIRON. Two of those are twins with mass ratios above 0.95. HIP 11537 is a young three-tier quadruple system with inner periods of 22.3 and 1146 days and the outer period of 3 kyr. HIP 22531

    更新日期:2020-07-17
  • Optical Studies of Eight AM Herculis–type Cataclysmic Variable Stars
    Astron. J. (IF 5.838) Pub Date : 2020-07-16
    John R. Thorstensen, Mokhine Motsoaledi, Patrick A. Woudt, David A. H. Buckley, and Brian Warner

    We report detailed follow-up observations of eight cataclysmic variable stars (CVs) that are apparently AM Her stars, also called polars. For all, we either determine orbital periods for the first time or improve on existing determinations. The seven for which we have spectra show the high-amplitude radial-velocity curves and prominent He ii λ 4686 emission lines characteristic of strongly magnetic

    更新日期:2020-07-17
  • EXPRES. I. HD 3651 as an Ideal RV Benchmark
    Astron. J. (IF 5.838) Pub Date : 2020-07-15
    John M. Brewer, Debra A. Fischer, Ryan T. Blackman, Samuel H. C. Cabot, Allen B. Davis, Gregory Laughlin, Christopher Leet, J. M. Joel Ong, Ryan R. Petersburg, Andrew E. Szymkowiak, Lily L. Zhao, Gregory W. Henry, and Joe Llama

    The next generation of exoplanet-hunting spectrographs should deliver up to an order of magnitude improvement in radial velocity (RV) precision over the standard 1 ##IMG## [http://ej.iop.org/images/1538-3881/160/2/67/ajab99c9ieqn1.gif] {${\rm{m}}\ {{\rm{s}}}^{-1}$} state-of-the-art spectrographs. This advance is critical for enabling the detection of Earth-mass planets around Sun-like stars. New calibration

    更新日期:2020-07-16
  • A Census of Star Formation in the Outer Galaxy. II. The GLIMPSE360 Field
    Astron. J. (IF 5.838) Pub Date : 2020-07-15
    Elaine Winston, Joseph L. Hora, and Volker Tolls

    We have conducted a study of star formation in the outer Galaxy from 65°< l < 265° in the region observed by the GLIMPSE360 program. This Spitzer warm mission program mapped the plane of the outer Milky Way with IRAC at 3.6 and4.5 μ m. We combine the IRAC, Wide-field Infrared Survey Explorer (WISE), and Two Micron All Sky Survey catalogs and our previous results from another outer Galaxy survey and

    更新日期:2020-07-16
  • A Catalog of Holes and Shells in the Interstellar Medium of the LITTLE THINGS Dwarf Galaxies
    Astron. J. (IF 5.838) Pub Date : 2020-07-14
    Nau Raj Pokhrel, Caroline E. Simpson, and Ioannis Bagetakos

    We present a catalog of holes and shells in the neutral atomic hydrogen (H i ) of 41 gas-rich dwarf galaxies in LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes, The H i Nearby Galaxy Survey). We analyzed their properties as part of an investigation into the relation between star formation and structures and kinematics in the H i of small galaxies. We confirmed 306 holes between 38 pc

    更新日期:2020-07-15
  • Massive Stars in Molecular Clouds Rich in High-energy Sources: The Bridge of G332.809–0.132 and CS 78 in NGC 6334
    Astron. J. (IF 5.838) Pub Date : 2020-07-14
    Maria Messineo, Karl M. Menten, Donald F. Figer, and J. Simon Clark

    Detections of massive stars in the direction of the H ii region CS 78 in NGC 6334 and of G332.809−0.132 are here presented. The region covered by the G332.809−0.132 complex coincides with the RCW 103 stellar association. In its core (40′ in radius), approximately 110 OB candidate stars ( K s < 10 mag and0.4 < ##IMG## [http://ej.iop.org/images/1538-3881/160/2/65/ajab9950ieqn1.gif] {${A}_{{K}_{s}}$} < 1

    更新日期:2020-07-15
  • KMT-2019-BLG-1339L: An M Dwarf with a Giant Planet or a Companion near the Planet/Brown Dwarf Boundary
    Astron. J. (IF 5.838) Pub Date : 2020-07-12
    Cheongho Han, Doeon Kim, Andrzej Udalski, Andrew Gould (Leading authors), Michael D. Albrow, Sun-Ju Chung, Kyu-Ha Hwang, Youn Kil Jung, Chung-Uk Lee, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge (The KMTNet Collaboration), Przemek Mróz, Michał K. Szymański

    We analyze KMT-2019-BLG-1339, a microlensing event with an obvious but incompletely resolved brief anomaly feature around the peak of the light curve. Although the origin of the anomaly is identified to be a companion to the lens with a low mass ratio q , the interpretation is subject to two different degeneracy types. The first type is the ambiguity in ρ , representing the angular source radius scaled

    更新日期:2020-07-13
  • Observations of Disequilibrium CO Chemistry in the Coldest Brown Dwarfs
    Astron. J. (IF 5.838) Pub Date : 2020-07-12
    Brittany E. Miles, Andrew J. I. Skemer, Caroline V. Morley, Mark S. Marley, Jonathan J. Fortney, Katelyn N. Allers, Jacqueline K. Faherty, Thomas R. Geballe, Channon Visscher, Adam C. Schneider, Roxana Lupu, Richard S. Freedman, and Gordon L. Bjoraker

    Cold brown dwarfs are excellent analogs of widely separated, gas giant exoplanets, and provide insight into the potential atmospheric chemistry and physics we may encounter in objects to be discovered by future direct imaging surveys. We present a low-resolution, R ∼ 300, M -band spectroscopic sequence of seven brown dwarfs with effective temperatures between 750 and 250 K along with Jupiter. These

    更新日期:2020-07-13
  • Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    Kathryn V. Lester, Francis C. Fekel, Matthew Muterspaugh, Douglas R. Gies, Gail H. Schaefer, Christopher D. Farrington, Zhao Guo, Rachel A. Matson, John D. Monnier, Theo ten Brummelaar, Judit Sturmann, and Samuel A. Weiss

    We present the visual orbits of two long-period spectroscopic binary stars, HD 8374 and HD 24546, using interferometric observations acquired with the CHARA Array and the Palomar Testbed Interferometer. We also obtained new radial velocities from echelle spectra using the APO 3.5 m and Fairborn 2.0 m telescopes. By combining the visual and spectroscopic observations, we solve for the full, three-dimensional

    更新日期:2020-07-09
  • ALMA Band-to-band Phase Referencing: Imaging Capabilities on Long Baselines and High Frequencies
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    Yoshiharu Asaki, Luke T. Maud, Edward B. Fomalont, William R. F. Dent, Loreto Barcos-Muñoz, Neil M. Phillips, Akihiko Hirota, Satoko Takahashi, Stuartt Corder, John M. Carpenter, and Eric Villard

    High-frequency long-baseline experiments with the Atacama Large Millimeter/submillimeter Array were organized to test the high angular resolution imaging capabilities in the submillimeter wave regime using baselines up to 16 km. Four experiments were conducted, two Band 7 (289 GHz) and two Band 8 (405 GHz) observations. Phase correction using band-to-band (B2B) phase referencing was used with a phase

    更新日期:2020-07-09
  • A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). III. Discovery of a z = 4.72 Radio Galaxy with the Lyman Break Technique
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    Takuji Yamashita, Tohru Nagao, Hiroyuki Ikeda, Yoshiki Toba, Masaru Kajisawa, Yoshiaki Ono, Masayuki Tanaka, Masayuki Akiyama, Yuichi Harikane, Kohei Ichikawa, Toshihiro Kawaguchi, Taiki Kawamuro, Kotaro Kohno, Chien-Hsiu Lee, Kianhong Lee, Yoshiki Matsuoka, Mana Niida, Kazuyuki Ogura, Masafusa Onoue, and Hisakazu Uchiyama

    We report a discovery of a z = 4.72 radio galaxy, HSC J083913.17+011308.1, using the Lyman break technique with the Hyper Suprime-Cam Subaru Strategic Survey (HSC-SSP) catalog for Very Large Array Faint Images of the Radio Sky at Twenty centimeter radio sources. The number of known high- z radio galaxies (HzRGs) at z > 3 is quite small to constrain the evolution of HzRGs so far. The deep and wide-area

    更新日期:2020-07-09
  • Long-term Photometry and Orbital Period Change of the W UMa–type Binary v0599 Aur: Evidence of about 11 yr Magnetic-activity Cycle
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    Ke Hu, Yun-Xia Yu, Jian-Fu Zhang, and Fu-Yuan Xiang

    Combining all available photometric data from various surveys and literature with our observations, we present 10 sets of light curves for the eclipsing binary V0599 Aur covering a timescale of 20 yr. During the last two decades, the O’Connell effect continuously varied and went through at least two flips between positive and negative effects. The photometric solutions from our two sets of multicolored

    更新日期:2020-07-09
  • New Candidates for Planetary-mass Brown Dwarfs in IC 348
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    K. L. Luhman and C. J. Hapich

    We have used infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to search for planetary-mass brown dwarfs in the star-forming cluster IC 348. In those images, we have identified 12 objects that have colors indicative of spectral types later than M8, corresponding to masses of ≲30 M Jup at the age of IC 348. The four brightest candidates have been observed with

    更新日期:2020-07-09
  • Dynamic Observing and Tiling Strategies for the DESI Legacy Surveys
    Astron. J. (IF 5.838) Pub Date : 2020-07-08
    Kaylan J. Burleigh, Martin Landriau, Arjun Dey, Dustin Lang, David J. Schlegel, Peter E. Nugent, Robert Blum, Joseph R. Findlay, Douglas P. Finkbeiner, David Herrera, Klaus Honscheid, Stéphanie Juneau, Ian McGreer, Aaron M. Meisner, John Moustakas, Adam D. Myers, Anna Patej, Edward F. Schlafly, Francisco Valdes, Alistair R. Walker, Benjamin A. Weaver, Christophe Yèche, and and the DECaLS, MzLS, and

    The Dark Energy Spectroscopic Instrument Legacy Surveys, a combination of three ground-based imaging surveys, have mapped 16,000 deg 2 in three optical bands ( g , r , and z ) to a depth 1–2 mag deeper than the Sloan Digital Sky Survey. Our work addresses one of the major challenges of wide-field imaging surveys conducted at ground-based observatories: the varying depth that results from varying observing

    更新日期:2020-07-09
  • Erratum: “Uranus in Northern Mid-spring: Persistent Atmospheric Temperatures and Circulations Inferred from Thermal Imaging” ( 2020, AJ, 159, 45 [https://doi.org/10.3847/1538-3881/ab5dc7] )
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Michael T. Roman, Leigh N. Fletcher, Glenn S. Orton, Naomi Rowe-Gurney, and Patrick G. J. Irwin

    Description unavailable

    更新日期:2020-07-03
  • Feasibility of Observing Gamma-Ray Polarization from Cygnus X-1 Using a CubeSat
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Chien-Ying Yang, Yi-Chi Chang, Hung-Hsiang Liang, Che-Yen Chu, Jr-Yue Hsiang, Jeng-Lun Chiu, Chih-Hsun Lin, Philippe Laurent, Jerome Rodriguez, and Hsiang-Kuang Chang

    Instruments flown on CubeSats are small. Meaningful applications of CubeSats in astronomical observations rely on the choice of a particular subject that is feasible for CubeSats. Here we report the result of a feasibility study for observing gamma-ray polarization from Cygnus X-1 using a small Compton polarimeter on board a 3U CubeSat. Silicon detectors and cerium bromide scintillators were employed

    更新日期:2020-07-03
  • The Hubble Space Telescope PanCET Program: An Optical to Infrared Transmission Spectrum of HAT-P-32Ab
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Munazza K. Alam, Mercedes López-Morales, Nikolay Nikolov, David K. Sing, Gregory W. Henry, Claire Baxter, Jean-Michel Désert, Joanna K. Barstow, Thomas Mikal-Evans, Vincent Bourrier, Panayotis Lavvas, Hannah R. Wakeford, Michael H. Williamson, Jorge Sanz-Forcada, Lars A. Buchhave, Ofer Cohen, and Antonio García Muñoz

    We present a 0.3−5 μ m transmission spectrum of the hot Jupiter HAT-P-32Ab observed with the Space Telescope Imaging Spectrograph and Wide Field Camera 3 instruments mounted on the Hubble Space Telescope, combined with Spitzer Infrared Array Camera photometry. The spectrum is composed of 51 spectrophotometric bins with widths ranging between 150 and 400 Å, measured to a median precision of 215 ppm

    更新日期:2020-07-03
  • CosTuuM: Polarized Thermal Dust Emission by Magnetically Oriented Spheroidal Grains
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Bert Vandenbroucke, Maarten Baes, and Peter Camps

    We present the new open-source C++-based Python library C os T uuM that can be used to generate infrared absorption and emission coefficients for arbitrary mixtures of spheroidal dust grains that are (partially) aligned with a magnetic field. We outline the algorithms underlying the software, demonstrate the accuracy of our results using benchmarks from literature, and use our tool to investigate some

    更新日期:2020-07-03
  • Giant-planet Influence on the Collective Gravity of a Primordial Scattered Disk
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Alexander Zderic and Ann-Marie Madigan

    Axisymmetric disks of high-eccentricity, low-mass bodies on near-Keplerian orbits are unstable to an out-of-plane buckling. This “inclination instability” exponentially grows the orbital inclinations, raises perihelion distances, and clusters in the argument of perihelion. Here we examine the instability in a massive primordial scattered disk including the orbit-averaged gravitational influence of

    更新日期:2020-07-03
  • Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
    Astron. J. (IF 5.838) Pub Date : 2020-07-01
    Theron W. Carmichael, Samuel N. Quinn, Alexander J. Mustill, Chelsea Huang, George Zhou, Carina M. Persson, Louise D. Nielsen, Karen A. Collins, Carl Ziegler, Kevin I. Collins, Joseph E. Rodriguez, Avi Shporer, Rafael Brahm, Andrew W. Mann, Francois Bouchy, Malcolm Fridlund, Keivan G. Stassun, Coel Hellier, Julia V. Seidel, Manu Stalport, Stephane Udry, Francesco Pepe, Michael Ireland, Maruša Žerjal

    We report the discovery of two intermediate-mass transiting brown dwarfs (BDs), TOI-569b and TOI-1406b, from NASA’s Transiting Exoplanet Survey Satellite mission. TOI-569b has an orbital period of P = 6.55604 ± 0.00016 days, a mass of M b = 64.1 ± 1.9 ##IMG## [http://ej.iop.org/images/1538-3881/160/1/53/ajab9b84ieqn1.gif] {${M}_{{\rm{J}}}$} , and a radius of R b = 0.75 ± 0.02 ##IMG## [http://ej.iop

    更新日期:2020-07-03
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