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  • Proper-motion Membership Tests for Four Planetary Nebulae in Galactic Globular Clusters
    Astron. J. (IF 5.497) Pub Date : 2020-05-27
    Howard E. Bond, Andrea Bellini, and Kailash C. Sahu

    Four planetary nebulae (PNe) are considered to be probable or possible members of Galactic globular clusters (GCs). These are Ps 1 = K648 in M15, GJJC 1 = IRAS 18333−2357 in M22, JaFu 1 in Palomar 6, and JaFu 2 in NGC 6441. In addition to lying close to the host GCs on the sky, these PNe have radial velocities that are consistent, within the errors and stellar velocity dispersions, with cluster membership

  • A Probabilistic Approach to Kepler Completeness and Reliability for Exoplanet Occurrence Rates
    Astron. J. (IF 5.497) Pub Date : 2020-05-26
    S. Bryson, J. Coughlin, N. M. Batalha, T. Berger, D. Huber, C. Burke, J. Dotson, and S. E. Mullally

    Exoplanet catalogs produced by surveys suffer from a lack of completeness (not every planet is detected) and less than perfect reliability (not every planet in the catalog is a true planet), particularly near the survey’s detection limit. Exoplanet occurrence rate studies based on such a catalog must be corrected for completeness and reliability. The final Kepler data release, DR25, features a uniformly

  • Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultranarrowband Photometry
    Astron. J. (IF 5.497) Pub Date : 2020-05-26
    Shreyas Vissapragada, Heather A. Knutson, Nemanja Jovanovic, Caleb K. Harada, Antonija Oklopčić, James Eriksen, Dimitri Mawet, Maxwell A. Millar-Blanchaer, Samaporn Tinyanont, and Gautam Vasisht

    Infrared observations of metastable 2 3 S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmospheres. Specifically, the transit depth in the triplet feature (with vacuum wavelengths near 1083.3 nm) can be used to constrain the temperature and mass-loss rate of an exoplanet’s upper atmosphere. Here, we present a new photometric

  • The Gaia–Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars
    Astron. J. (IF 5.497) Pub Date : 2020-05-26
    Travis A. Berger, Daniel Huber, Jennifer L. van Saders, Eric Gaidos, Jamie Tayar, and Adam L. Kraus

    An accurate and precise Kepler Stellar Properties Catalog is essential for the interpretation of the Kepler exoplanet survey results. Previous Kepler Stellar Properties Catalogs have focused on reporting the best-available parameters for each star, but this has required combining data from a variety of heterogeneous sources. We present the Gaia–Kepler Stellar Properties Catalog, a set of stellar properties

  • A Numerical Method for Determining the Elements of Circumbinary Orbits and Its Application to Circumbinary Planets and the Satellites of Pluto-Charon
    Astron. J. (IF 5.497) Pub Date : 2020-05-26
    Jason Man Yin Woo and Man Hoi Lee

    Planets and satellites orbiting a binary system exist in the solar system and extrasolar planetary systems. Their orbits can be significantly different from Keplerian orbits, if they are close to the binary and the secondary-to-primary mass ratio is high. A proper description of a circumbinary orbit is in terms of the free eccentricity e free at the epicyclic frequency κ 0 , forced eccentricity e forced

  • Pluto's Ultraviolet Spectrum, Surface Reflectance, and Airglow Emissions
    Astron. J. (IF 5.497) Pub Date : 2020-05-25
    Andrew J. Steffl, Leslie A. Young, Darrell F. Strobel, Joshua A. Kammer, J. Scott Evans, Michael H. Stevens, Rebecca N. Schindhelm, Joel Wm. Parker, S. Alan Stern, Harold A. Weaver, Catherine B. Olkin, Kimberly Ennico, Jay R. Cummings, G. Randall Gladstone, Thomas K. Greathouse, David P. Hinson, Kurt D. Retherford, Michael E. Summers, and Maarten Versteeg

    During the New Horizons spacecraft’s encounter with Pluto, the Alice ultraviolet spectrograph conducted a series of observations that detected emissions from both the interplanetary medium (IPM) and Pluto. In the direction of Pluto, the IPM was found to be 133.4 ± 0.6 R at Ly α , 0.24 ± 0.02 R at Ly β , and <0.10 R at He i 584 Å. We analyzed 3900 s of data obtained shortly before closest approach to

  • Rotation of Low-mass Stars in Taurus with K2
    Astron. J. (IF 5.497) Pub Date : 2020-05-25
    L. M. Rebull, J. R. Stauffer, A. M. Cody, L. A. Hillenbrand, J. Bouvier, N. Roggero, and T. J. David

    We present an analysis of K2 light curves (LCs) from Campaigns 4 and 13 for members of the young (∼3 Myr) Taurus association, in addition to an older (∼30 Myr) population of stars that is largely in the foreground of the Taurus molecular clouds. Out of 156 of the highest-confidence Taurus members, we find that 81% are periodic. Our sample of young foreground stars is biased and incomplete, but nearly

  • A Coupled Analysis of Atmospheric Mass Loss and Tidal Evolution in XUV Irradiated Exoplanets: The TRAPPIST-1 Case Study
    Astron. J. (IF 5.497) Pub Date : 2020-05-25
    Juliette Becker, Elena Gallo, Edmund Hodges-Kluck, Fred C. Adams, and Rory Barnes

    Exoplanets residing close to their stars can experience evolution of both their physical structures and their orbits due to the influence of their host stars. In this work, we present a coupled analysis of dynamical tidal dissipation and atmospheric mass loss for exoplanets in X-ray and ultraviolet (XUV) irradiated environments. As our primary application, we use this model to study the TRAPPIST-1

  • Bayesian Approach for Determining Microlens System Properties with High-angular-resolution Follow-up Imaging
    Astron. J. (IF 5.497) Pub Date : 2020-05-20
    Naoki Koshimoto, David P. Bennett, and Daisuke Suzuki

    We present the details of the Bayesian analysis of the planetary microlensing event MOA-2016-BLG-227, whose excess flux is likely due to a source/lens companion or an unrelated ambient star, as well as of the assumed prior distributions. Furthermore, we apply this method to four reported planetary events, MOA-2008-BLG-310, MOA-2011-BLG-293, OGLE-2012-BLG-0527, and OGLE-2012-BLG-0950, where adaptive

  • Hubble Space Telescope Astrometry in the Orion Nebula Cluster: Census of Low-mass Runaways
    Astron. J. (IF 5.497) Pub Date : 2020-05-20
    Imants Platais, Massimo Robberto, Andrea Bellini, Vera Kozhurina-Platais, Mario Gennaro, Giovanni Strampelli, Lynne A. Hillenbrand, Selma E. de Mink, and David R. Soderblom

    We present a catalog of high-precision proper motions in the Orion Nebula Cluster (ONC), based on Treasury Program observations with the Hubble Space Telescope’s (HST) ACS/WFC camera. Our catalog contains 2454 objects in the magnitude range of14.2 < m F775W < 24.7, thus probing the stellar masses of the ONC from ∼0.4 M ☉ down to ∼0.02 M ☉ over an area of ∼550 arcmin 2 . We provide a number of internal

  • Photometry as a Proxy for Stellar Activity in Radial Velocity Analyses
    Astron. J. (IF 5.497) Pub Date : 2020-05-20
    Molly R. Kosiarek and Ian J. M. Crossfield

    Stellar activity remains a limiting factor in measuring precise planet parameters from radial velocity spectroscopy, not least in the search for Earth-mass planets orbiting in the habitable zones of Sun-like stars. One approach to mitigate stellar activity is to use combined analyses of both radial velocity and time-series photometry. We present an analysis of simultaneous disk-integrated photometry

  • The Bulge Radial Velocity Assay for RR Lyrae Stars (BRAVA-RR) DR2: A Bimodal Bulge?
    Astron. J. (IF 5.497) Pub Date : 2020-05-20
    Andrea Kunder, Angeles Pérez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm, and Jennifer Wojno

    The radial velocities of 2768 fundamental-mode RR Lyrae stars (RRLs) toward the southern Galactic bulge are presented, spanning the southern bulge from −8° < l < + 8° and −3° < b < −6°. Distances derived from the pulsation properties of the RRLs are combined with Gaia proper motions to give constraints on the orbital motions of 1389 RRLs. The majority (∼75%) of the bulge RRLs have orbits consistent

  • Galaxy Cluster Contribution to the Diffuse Extragalactic Ultraviolet Background
    Astron. J. (IF 5.497) Pub Date : 2020-05-20
    Brian Welch, Stephan McCandliss, and Dan Coe

    The diffuse ultraviolet background radiation has been mapped over most of the sky with 2′ resolution using data from the Galaxy Evolution Explorer survey. We utilize this map to study the correlation between the UV background and clusters of galaxies discovered via the Sunyaev–Zeldovich effect in the Planck survey. We use only high Galactic latitude ( ##IMG## [http://ej.iop.org/images/1538-3881/15

  • Keck/NIRC2 L ’-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70
    Astron. J. (IF 5.497) Pub Date : 2020-05-17
    Jason J. Wang, Sivan Ginzburg, Bin Ren, Nicole Wallack, Peter Gao, Dimitri Mawet, Charlotte Z. Bond, Sylvain Cetre, Peter Wizinowich, Robert J. De Rosa, Garreth Ruane, Michael C. Liu, Olivier Absil, Carlos Alvarez, Christoph Baranec, Élodie Choquet, Mark Chun, Denis Defrère, Jacques-Robert Delorme, Gaspard Duchêne, Pontus Forsberg, Andrea Ghez, Olivier Guyon, Donald N. B. Hall, Elsa Huby, Aïssa Jolivet

    We present L ’-band imaging of the PDS 70 planetary system with Keck/NIRC2 using the new infrared pyramid wave front sensor. We detected both PDS 70 b and c in our images, as well as the front rim of the circumstellar disk. After subtracting off a model of the disk, we measured the astrometry and photometry of both planets. Placing priors based on the dynamics of the system, we estimated PDS 70 b to

  • HATS-71b: A Giant Planet Transiting an M3 Dwarf Star in TESS Sector 1
    Astron. J. (IF 5.497) Pub Date : 2020-05-17
    G. Á. Bakos, D. Bayliss, J. Bento, W. Bhatti, R. Brahm, Z. Csubry, N. Espinoza, J. D. Hartman, Th. Henning, A. Jordán, L. Mancini, K. Penev, M. Rabus, P. Sarkis, V. Suc, M. de Val-Borro, G. Zhou, R. P. Butler, J. Crane, S. Durkan, S. Shectman, J. Kim, J. Lázár, I. Papp, P. Sári, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. Jenkins, A. D. Chacon, G. Fűrész, B. Goeke, J. Li, S. Quinn

    We report the discovery of HATS-71b, a transiting gas giant planet on a ##IMG## [http://ej.iop.org/images/1538-3881/159/6/267/ajab8ad1ieqn1.gif] {$P=3.7955$} day orbit around a ##IMG## [http://ej.iop.org/images/1538-3881/159/6/267/ajab8ad1ieqn2.gif] {$G=15.35$} mag M3 dwarf star. HATS-71 is the coolest M dwarf star known to host a hot Jupiter. The loss of light during transits is 4.7%, more than in

  • Speckle Interferometry of Nearby Multiple Stars: 2007–2019 Positional Measurements and Orbits of Eight Objects
    Astron. J. (IF 5.497) Pub Date : 2020-05-17
    A. Mitrofanova, V. Dyachenko, A. Beskakotov, Yu. Balega, A. Maksimov, D. Rastegaev, and S. Komarinsky

    The orbits of eight systems with low-mass components (HIP 14524, HIP 16025, HIP 28671, HIP 46199, HIP 47791, HIP 60444, HIP 61100, and HIP 73085) are presented. Speckle interferometric data were obtained at the 6 m Big Telescope Alt-azimuth Special Astrophysical Observatory of the Russian Academy of Sciences (BTA SAO RAS) from 2007 to 2019. New data, together with measures already in the literature

  • Nearby Quintuple Systems κ Tucanae and ξ Scorpii
    Astron. J. (IF 5.497) Pub Date : 2020-05-17
    Andrei Tokovinin

    Architecture and parameters of two wide, nearby hierarchical systems containing five solar-type stars each, κ Tuc and ξ Sco, are studied. Using Gaia astrometry and photometry, masses are determined from visual orbits and isochrones, and effective temperatures from spectra or colors. Both systems are ∼2 Gyr old. Their spatial motion corresponds to a young disk but does not match any known kinematic

  • Determination of Size, Albedo, and Thermal Inertia of 10 Vesta Family Asteroids with WISE/NEOWISE Observations
    Astron. J. (IF 5.497) Pub Date : 2020-05-17
    Haoxuan Jiang, Jianghui Ji, and Liangliang Yu

    In this work, we investigate the size, thermal inertia, surface roughness, and geometric albedo of 10 Vesta family asteroids using the Advanced Thermophysical Model, based on the thermal-infrared data acquired by mainly NASA’s Wide-field Infrared Survey Explorer. Here, we show that the average thermal inertia and geometric albedo of the investigated Vesta family members are 42 J m −2 s −1/2 K −1 and

  • Orbital Stability of Exomoons and Submoons with Applications to Kepler 1625b-I
    Astron. J. (IF 5.497) Pub Date : 2020-05-13
    Marialis Rosario-Franco, Billy Quarles, Zdzislaw E. Musielak, and Manfred Cuntz

    An intriguing question in the context of dynamics arises: could a moon possess a moon itself? Such a configuration does not exist in the solar system, although this may be possible in theory. Kollmeier & Raymond determined the critical size of a satellite necessary to host a long-lived subsatellite, or submoon. However, the orbital constraints for these submoons to exist are still undetermined. Domingos

  • A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551
    Astron. J. (IF 5.497) Pub Date : 2020-05-13
    Przemek Mróz, Radosław Poleski, Cheongho Han, Andrzej Udalski, Andrew Gould, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Jan Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona (OGLE Collaboration), Michael D. Albrow, Sun-Ju Chung, Kyu-Ha Hwang, Yoon-Hyun Ryu, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng

    High-cadence observations of the Galactic bulge by the microlensing surveys led to the discovery of a handful of extremely short-timescale microlensing events that can be attributed to free-floating or wide-orbit planets. Here, we report the discovery of another strong free-floating planet candidate, which was found from the analysis of the gravitational microlensing event OGLE-2019-BLG-0551. The light

  • A Wide-orbit Exoplanet OGLE-2012-BLG-0838Lb
    Astron. J. (IF 5.497) Pub Date : 2020-05-13
    R. Poleski, Daisuke Suzuki, A. Udalski, Xiaojia Xie, J. C. Yee, Naoki Koshimoto, B. S. Gaudi, A. Gould (leading authors), J. Skowron, M. K. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, Ł. Wyrzykowski, K. Ulaczyk (OGLE collaboration), Fumio Abe, Richard K. Barry, David. P. Bennett, Aparna Bhattacharya, Ian A. Bond, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yoshitaka Itow, Yuki Hirao

    We present the discovery of a planet on a very wide orbit in the microlensing event OGLE-2012-BLG-0838. The signal of the planet is well separated from the main peak of the event and the planet–star projected separation is found to be twice the Einstein ring radius, which corresponds to a projected separation of ≈4 au. Similar planets around low-mass stars are very hard to find using any technique

  • Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry
    Astron. J. (IF 5.497) Pub Date : 2020-05-12
    Melissa L. Graham, Andrew J. Connolly, Winnie Wang, Samuel J. Schmidt, Christopher B. Morrison, Željko Ivezić, Sébastien Fabbro, Patrick Côté, Scott F. Daniel, R. Lynne Jones, Mario Jurić, Peter Yoachim, and J. Bryce Kalmbach

    Accurate photometric redshift (photo- z ) estimates are essential to the cosmological science goals of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). In this work, we use simulated photometry for mock galaxy catalogs to explore how LSST photo- z estimates can be improved by the addition of near-infrared (NIR) and/or ultraviolet ( UV ) photometry from the Euclid, Wide-Field InfrarRed

  • Dust Reverberation of 3C 273: Torus Structure and Lag–Luminosity Relation
    Astron. J. (IF 5.497) Pub Date : 2020-05-12
    Catalina Sobrino Figaredo, Martin Haas, Michael Ramolla, Rolf Chini, Julia Blex, Klaus Werner Hodapp, Miguel Murphy, Wolfram Kollatschny, Doron Chelouche, and Shai Kaspi

    We monitored the z = 0.158 quasar 3C 273 between 2015 and 2019 in the optical ( BVrz ) and near-infrared ( JHK ) with the aim to perform dust reverberation mapping. Accounting for host galaxy and accretion disk contributions, we obtained pure dust light curves in JHK . Cross correlations between the V band and the dust light curves yield an average rest-frame delay for the hot dust of τ cent ∼ 410

  • Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main-sequence Pulsating Stars.
    Astron. J. Pub Date : 2020-02-10
    Eric L Sandquist,Dennis Stello,Torben Arentoft,Karsten Brogaard,Frank Grundahl,Andrew Vanderburg,Anne Hedlund,Ryan DeWitt,Taylor R Ackerman,Miguel Aguilar,Andrew J Buckner,Christian Juarez,Arturo J Ortiz,David Richarte,Daniel I Rivera,Levi Schlapfer

    We present a survey of variable stars detected in K2 Campaign 13 within the massive intermediate-age (~1 Gyr) open cluster NGC 1817. We identify a complete sample of 44 red clump stars in the cluster, and have measured asteroseismic quantities (ν max and/or Δν) for 29 of them. Five stars showed suppressed dipole modes, and the occurrence rates indicate that mode suppression is unaffected by evolution

  • Not a simple relationship between Neptune's migration speed and Kuiper belt inclination excitation.
    Astron. J. Pub Date : 2019-10-22
    Kathryn Volk,Renu Malhotra

    We present numerical simulations of giant planet migration in our solar system and examine how the speed of planetary migration affects inclinations in the resulting population of small bodies (test particles) scattered outward and subsequently captured into Neptune's 3:2 mean motion resonance (the Plutinos) as well as the hot classical Kuiper belt population. We do not find a consistent relationship

    Astron. J. Pub Date : 2019-09-20
    T L Esplin,K L Luhman

    We present a large sample of new members of the Taurus star-forming region that extend from stellar to planetary masses. To identify candidate members at substellar masses, we have used color-magnitude diagrams and proper motions measured with several wide-field optical and infrared (IR) surveys. At stellar masses, we have considered the candidate members that were found in a recent analysis of high-precision

  • On the Dynamics of the Inclination Instability.
    Astron. J. Pub Date : 2019-08-06
    Ann-Marie Madigan,Alexander Zderic,Michael McCourt,Jacob Fleisig

    Axisymmetric disks of eccentric Kepler orbits are vulnerable to an instability that causes orbits to exponentially grow in inclination, decrease in eccentricity, and cluster in their angle of pericenter. Geometrically, the disk expands to a cone shape that is asymmetric about the mid-plane. In this paper, we describe how secular gravitational torques between individual orbits drive this "inclination

    Astron. J. Pub Date : 2019-08-06
    Nathan A Kaib,Rosemary Pike,Samantha Lawler,Maya Kovalik,Christopher Brown,Mike Alexandersen,Michele T Bannister,Brett J Gladman,Jean-Marc Petit

    Most known trans-Neptunian objects (TNOs) gravitationally scattering off the giant planets have orbital inclinations consistent with an origin from the classical Kuiper belt, but a small fraction of these "scattering TNOs" have inclinations that are far too large (i > 45°) for this origin. These scattering outliers have previously been proposed to be interlopers from the Oort cloud or evidence of an

    Astron. J. Pub Date : 2019-05-14
    Kaloyan Penev,L G Bouma,Joshua N Winn,Joel D Hartman

    Stars with hot Jupiters tend to be rotating faster than other stars of the same age and mass. This trend has been attributed to tidal interactions between the star and planet. A constraint on the dissipation parameter Q ⋆ ' follows from the assumption that tides have managed to spin up the star to the observed rate within the age of the system. This technique was applied previously to HATS-18 and WASP-19

  • Instabilities in the Early Solar System due to a Self-gravitating Disk.
    Astron. J. Pub Date : 2019-02-01
    B Quarles,N Kaib

    Modern studies of the early solar system routinely invoke the possibility of an orbital instability among the giant planets triggered by gravitational interactions between the planets and a massive exterior disk of planetesimals. Previous works have suggested that this instability can be substantially delayed (~100s Myr) after the formation of the giant planets. Bodies in the disk are typically treated

    Astron. J. Pub Date : 2019-01-08
    K L Luhman,K A Herrmann,E E Mamajek,T L Esplin,M J Pecaut

    To improve the census of the Upper Sco association (~11 Myr, ~145 pc), we have identified candidate members using parallaxes, proper motions, and color-magnitude diagrams from several wide-field imaging surveys and have obtained optical and infrared spectra of several hundred candidates to measure their spectral types and assess their membership. We also have performed spectroscopy on a smaller sample

  • A New, Long-Lived, Jupiter Mesoscale Wave Observed at Visible Wavelengths.
    Astron. J. Pub Date : 2018-12-05
    Amy A Simon,Ricardo Hueso,Peio Iñurrigarro,Agustín Sánchez-Lavega,Raúl MoralesJuberías,Richard Cosentino,Leigh N Fletcher,Michael H Wong,Andrew I Hsu,Imke de Pater,Glenn S Orton,François Colas,Marc Delcroix,Damian Peach,Josep-María Gómez-Forrellad

    Small-scale waves were observed along the boundary between Jupiter's North Equatorial Belt and North Tropical Zone, ~16.5° N planetographic latitude in Hubble Space Telescope data in 2012 and throughout 2015 to 2018, observable at all wavelengths from the UV to the near IR. At peak visibility, the waves have sufficient contrast (~10%) to be observed from ground-based telescopes. They have a typical

  • Jupiter's Mesoscale Waves Observed at 5 μm by Ground-based Observations and Juno JIRAM.
    Astron. J. Pub Date : 2018-12-05
    Leigh N Fletcher,H Melin,A Adriani,A A Simon,A Sanchez-Lavega,P T Donnelly,A Antuñano,G S Orton,R Hueso,E Kraaikamp,M H Wong,M Barnett,M L Moriconi,F Altieri,G Sindoni

    We characterize the origin and evolution of a mesoscale wave pattern in Jupiter's North Equatorial Belt (NEB), detected for the first time at 5 μm using a 2016-17 campaign of "lucky imaging" from the VISIR instrument on the Very Large Telescope and the NIRI instrument on the Gemini observatory, coupled with M-band imaging from Juno's JIRAM instrument during the first seven Juno orbits. The wave is

  • Spectroscopic Characterization of Key Aromatic Molecules: A Route toward The Origin of Life.
    Astron. J. Pub Date : 2018-04-07
    Cristina Puzzarini,Alberto Baiardi,Julien Bloino,Vincenzo Barone,Thomas E Murphy,Dennis Drew,Ashraf Ali

    To gain information on the abiotic synthesis of the building blocks of life from simple molecules, and their subsequent chemical evolution to biological systems, the starting point is the identification of target species in Titan-like planets, i.e., planets that resemble the primitive Earth, as well as in Earth-like planets in the habitable zone of their star, namely planets where life can be already

  • FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables.
    Astron. J. Pub Date : 2018-02-20
    Edward M Sion,Patrick Godon,Joanna Mikolajewska,Bassem Sabra,Craig Kolobow

    We have conducted a spectroscopic analysis of the far ultraviolet archival spectra of four symbiotic variables, EG And, AE Ara, CQ Dra and RW Hya. RW Hya and EG And have never had a recorded outburst while CQ Dra and AE Ara have outburst histories. We analyze these systems while they are in quiescence in order to help reveal the physical properties of their hot components via comparisons of the observations

  • Far Ultraviolet Spectroscopy of Old Novae. II. RR Pic, V533 Her, and DI Lac.
    Astron. J. Pub Date : 2018-02-20
    Edward M Sion,Patrick Godon,Liam Jones

    The old novae V533 Her (Nova Her 1963), DI Lac (Nova Lac 1910), and RR Pic (Nova Pic 1891) are in (or near) their quiescent stage, following their nova explosions, and continue to accrete at a high rate in the aftermath of their explosions. They exhibit continua that are steeply rising into the FUV, as well as absorption lines and emission lines of uncertain origin. All three have Far Ultraviolet Spectroscopic

  • Hubble COS Spectroscopy of the Dwarf Nova CW Mon: The White Dwarf in Quiescence?
    Astron. J. Pub Date : 2018-02-13
    Connor Hause,Edward M Sion,Patrick Godon,T Gänsicke Boris,Paula Szkody,Domitilla de Martino,Anna Pala

    We present a synthetic spectral analysis of the HST COS spectrum of the U Geminorum-type dwarf nova CW Mon, taken during quiescence as part of our COS survey of accreting white dwarfs in Cataclysmic Variables. We use synthetic photosphere and optically thick accretion disk spectra to model the COS spectrum as well as archival IUE spectra obtained decades ago when the system was in an even deeper quiescent

    Astron. J. Pub Date : 2018-01-30
    Joseph R Schmitt,Jon M Jenkins,Debra A Fischer

    The vast majority of the 4700 confirmed planets and planet candidates discovered by the Kepler space telescope were first found by the Kepler pipeline. In the pipeline, after a transit signal is found, all data points associated with those transits are removed, creating a "Swiss cheese"-like light curve full of holes, which is then used for subsequent transit searches. These holes could render an additional

    Astron. J. Pub Date : 2017-11-01
    Raluca Rufu,Robin M Canup

    The Neptunian satellite system is unusual. The major satellites of Jupiter, Saturn and Uranus are all in prograde, low inclination orbits. Neptune on the other hand, has the fewest satellites and most of the system's mass is within one irregular satellite, Triton. Triton was most likely captured by Neptune and destroyed the primordial regular satellite system. We investigate the interactions between

  • Second Epoch VLBA Calibrator Survey Observations - VCS-II.
    Astron. J. Pub Date : 2016-05-27
    David Gordon,Christopher Jacobs,Anthony Beasley,Alison Peck,Ralph Gaume,Patrick Charlot,Alan Fey,Chopo Ma,Oleg Titov,David Boboltz

    Six very successful VLBA calibrator survey campaigns were run between 1994 and 2007 to build up a large list of compact radio sources with positions precise enough for use as VLBI phase reference calibrators. We report on the results of a second epoch VLBA Calibrator Survey campaign (VCS-II) in which 2400 VCS sources were re-observed at X and S bands in order to improve the upcoming third realization

  • Far Ultraviolet Spectroscopy of Old Novae I. V603 Aquila.
    Astron. J. Pub Date : 2015-07-01
    Edward M Sion,Patrick Godon,Alexandra Bisol

    We present the results of a synthetic spectral analysis of the far ultraviolet archival IUE, HST and FUSE observations of the fast old nova V603 Aql, obtained some 90 years after its 1918 nova outburst. Our analysis utilizes the new Hubble FGS parallax distance for this nearly face-on old nova, a high white dwarf mass and a low reddening. Our analysis includes non-truncated optically thick accretion

    Astron. J. Pub Date : 2013-01-01
    Jacqueline K Faherty,Emily L Rice,Kelle L Cruz,Eric E Mamajek,Alejandro Núñez

    We present parallax and proper motion measurements, near-infrared spectra, and WISE photometry for the low surface gravity L5γ dwarf 2MASSJ035523.37+113343.7 (2M0355). We use these data to evaluate photometric, spectral, and kinematic signatures of youth as 2M0355 is the reddest isolated L dwarf yet classified. We confirm its low-gravity spectral morphology and find a strong resemblance to the sharp

    Astron. J. Pub Date : 2012-01-01
    Koraljka Mužić,Jacqueline Radigan,Ray Jayawardhana,Valentin D Ivanov,Jacqueline K Faherty,Radostin G Kurtev,Alejandro Núñez,Henri M J Boffin,Olivier Hainaut,Kelle Cruz,David Jones,Stanimir Metchev,Amy Tyndall,Jura Borissova

    We present the discovery and spectroscopic follow-up of a nearby late-type L dwarf (2M0614+3950), and two extremely wide very-low-mass binary systems (2M0525-7425AB and 2M1348-1344AB), resulting from our search for common proper motion pairs containing ultracool components in the Two Micron All Sky Survey (2MASS) and the Wide-field Infrared Survey Explorer (WISE) catalogs. The near-infrared spectrum

  • H2O ice in the envelopes of OH/IR stars.
    Astron. J. Pub Date : 2001-09-07
    A W Meyer,R G Smith,S B Charnley,Y J Pendleton

    In an attempt to better understand the conditions under which molecules condense onto grains in the envelopes of evolved stars, we have searched for the presence of H2O ice in the circumstellar envelopes of several evolved (OH/IR) stars. The sample of stars observed was selected on the basis of mass-loss rates, luminosities, and outflow velocities in order to cover a range of physical conditions that

  • The dust coma of Comet P/Giacobini-Zinner in the infrared.
    Astron. J. Pub Date : 1992-07-01
    M S Hanner,G J Veeder,A T Tokunaga

    We present 1-20 micrometers photometry of P/Giacobini-Zinner obtained at the NASA Infrared Telescope Facility, during 1985 June-September (r = 1.57-1.03 AU). A broad, weak 10 micrometers silicate emission feature was detected on August 26.6; a similar weak emission feature could have been hidden in the broadband photometry on other dates. The total scattering and emitting cross section of dust in the

  • A survey of cyclopropenylidene (C3H2) in galactic sources.
    Astron. J. Pub Date : 1989-05-01
    S C Madden,W M Irvine,H E Matthews,P Friberg,D A Swade

    We report the results of an initial survey in a variety of Galactic sources for cyclopropenylidene (C3H2), the first interstellar hydrocarbon ring molecule. C3H2 is found to be very widespread throughout the Galaxy. This, together with its large dipole moment and many observable transitions, makes cyclopropenylidene a promising probe for physical conditions in the interstellar medium. The ortho 1(10)-1(01)

  • Radiometry of near-earth asteroids.
    Astron. J. Pub Date : 1989-04-01
    G J Veeder,M S Hanner,D L Matson,E F Tedesco,L A Lebofsky,A T Tokunaga

    We report 10 micrometers infrared photometry for 22 Aten, Apollo, and Amor asteroids. Thermal models are used to derive the corresponding radiometric albedos and diameters. Several of these asteroids appear to have surfaces of relatively high thermal inertia due to the exposure of bare rock or a coarse regolith. The Apollo asteroid 3103, 1982 BB, is recognized as class E. The Jupiter-crossing Amor

  • Comet Sugano-Saigusa-Fujikawa (1983V)--a small, puzzling comet.
    Astron. J. Pub Date : 1987-10-01
    M S Hanner,R L Newburn,H Spinrad,G J Veeder

    Spectroscopic and infrared observations of Comet Sugano-Saigusa-Fujikawa (1983V) were obtained during its close approach to the Earth on 11-14 June 1983. The [O I] production rates of 1.8 +/- 0.9 x 10(26) atoms/s observed on 12.3 June and 7 +/- 3.5 x 10(26) atoms/s on 13.4 June lead to derived water-production rates of 3 x 10(27) mol/s on 12 June and 1.1 x 10(28) mol/s on 13 June. The abundances of

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