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The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au
Wittenmyer, Robert A.; Horner, Jonathan; Dupuy, Trent J. +12 more
Gliese 86 is a nearby K dwarf hosting a giant planet on a ≈16 day orbit and an outer white dwarf companion on a ≈century-long orbit. In this study we combine radial velocity data (including new measurements spanning more than a decade) with high angular resolution imaging and absolute astrometry from Hipparcos and Gaia to measure the current orbit…
A Hot Mars-sized Exoplanet Transiting an M Dwarf
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +21 more
We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R …
Orbits of the Irregular Satellites of Uranus and Neptune
Jacobson, Robert A.; Brozović, Marina
We report on an ephemerides update for the irregular satellites of Uranus and Neptune, including Nereid. Our data set contains ground-based and Voyager 2 position measurements of the satellites. Some of the new observations were reduced with respect to the GAIA star catalog and represent high-quality, modern astrometry. The orbital fits are based …
White Dwarf Binaries across the H-R Diagram
Schneider, Donald P.; Majewski, Steven R.; Stassun, Keivan G. +7 more
We created the APOGEE-GALEX-Gaia catalog to study white dwarf (WD) binaries. This database aims to create a minimally biased sample of WD binary systems identified from a combination of GALEX, Gaia, and APOGEE data to increase the number of WD binaries with orbital parameters and chemical compositions. We identify 3414 sources as WD binary candida…
High-velocity Stars in SDSS/APOGEE DR17
Pereira, C. B.; Cunha, K.; Majewski, S. R. +7 more
We report 23 stars having Galactocentric velocities larger than 450 km s-1 in the final data release of the APOGEE survey. This sample was generated using space velocities derived by complementing the high-quality radial velocities from the APOGEE project in Sloan Digital Sky Survey's Data Release 17 (DR17) with distances and proper mot…
TOI-712: A System of Adolescent Mini-Neptunes Extending to the Habitable Zone
Vanderburg, Andrew; Hellier, Coel; Triaud, Amaury H. M. J. +41 more
As an all-sky survey, NASA's Transiting Exoplanet Survey Satellite (TESS) mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study of the evolutionary processes that occur within the first billion years. Here we report the discovery of a young, multiplanet system orbiting t…
Discovery of SiO Masers in the "Water Fountain" Source IRAS 16552-3050
Tafoya, D.; Gómez, J. F.; Uscanga, L. +7 more
In this paper, we report new detections of SiO v = 1 and v = 2 J = 1 → 0 masers in the "water fountain" source IRAS 16552-3050, which was observed with the Nobeyama 45 m telescope during 2021 March-April. Water fountains are evolved stars whose H2O maser spectra trace high-velocity outflows of >100 km s-1. This is the seco…
Gap Opening and Inner Disk Structure in the Strongly Accreting Transition Disk of DM Tau
Dong, Ruobing; Johnstone, Doug; Liu, Hauyu Baobab +7 more
Large inner dust gaps in transition disks are frequently posited as evidence of giant planets sculpting gas and dust in the disk, or the opening of a gap by photoevaporative winds. Although the former hypothesis is strongly supported by the observations of planets and deep depletions in gas within the gap in some disks, many T Tauri stars hosting …
Revised Stellar Parameters for V471 Tau, A Post-common Envelope Binary in the Hyades
Drout, Maria R.; Muirhead, Philip S.; Nordhaus, Jason
V471 Tau is a post-common-envelope binary consisting of an eclipsing DA white dwarf and a K-type main-sequence star in the Hyades star cluster. We analyzed publicly available photometry and spectroscopy of V471 Tau to revise the stellar and orbital parameters of the system. We used archival K2 photometry, archival Hubble Space Telescope spectrosco…
Far-ultraviolet to FIR Spectral-energy Distribution Modeling of the Stellar Formation History of the M31 Bulge
Leahy, Denis; Leahy, Cameron; Seminoff, Noah
M31 is being surveyed at far- and near-ultraviolet with the UVIT telescope on AstroSat. The central bulge of M31 was observed in the N279N (275-280 nm), N219M (200-240 nm), F172M (160-185 nm), F169M (145-175 nm), and F148W (120-180 nm) filters. These images are made publicly available here. The UVIT data are supplemented with Sloan Digital Sky Sur…