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A Multi-band Catalog of 10978 Star Clusters, Associations, and Candidates in the Milky Way
Bica, Eduardo; Pavani, Daniela B.; Bonatto, Charles J. +1 more
We present a catalog of Galactic star clusters, associations and candidates with 10978 entries. This multi-band catalog was constructed over 20 years, starting with visual inspections on the Digital Sky Survey and incremented with the 2MASS, WISE, VVV, Spitzer, and Herschel surveys. Large and small catalogs, as well as papers on individual objects…
Disentangling the Planet from the Star in Late-Type M Dwarfs: A Case Study of TRAPPIST-1g
Bourrier, V.; Wakeford, H. R.; Lewis, N. K. +10 more
The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets because of the presence of strong molecular features in the stellar atmosphere. TRAPPIST-1 is an ultracool dwarf, host to seven transiting planets, and contains its own molecular signatures that can potentially be imprinted on pla…
A Survey for New Members of Taurus from Stellar to Planetary Masses
Luhman, K. L.; Esplin, T. L.
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…
Compositions of Planetary Debris around Dusty White Dwarfs
Zuckerman, B.; Dufour, Patrick; Xu, Siyi +5 more
The photospheres of some white dwarfs (WDs) are “polluted” by accretion of material from their surrounding planetary debris. WDs with dust disks are often heavily polluted and high-resolution spectroscopic observations of these systems can be used to infer the chemical compositions of extrasolar planetary material. Here, we report spectroscopic ob…
HD 202772A b: A Transiting Hot Jupiter around a Bright, Mildly Evolved Star in a Visual Binary Discovered by TESS
Trifonov, Trifon; Reffert, Sabine; Kürster, Martin +58 more
We report the first confirmation of a hot Jupiter discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HD 202772A b. The transit signal was detected in the data from TESS Sector 1, and was confirmed to be of planetary origin through radial velocity (RV) measurements. HD 202772A b is orbiting a mildly evolved star with a period o…
The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS)
Villanueva, Geronimo L.; Cochran, Anita L.; Bauer, James +14 more
Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile, as opposed to H2O, and one of the largest N2/CO ratios ever observed in a comet. Using observations obtained with the Spitzer Space Telescope, NASA’s Infrared Telescope Facility, the 3.5 m Astrophysical Research Consortium te…
WASP-4b Arrived Early for the TESS Mission
Dai, F.; Winn, J. N.; Jenkins, J. M. +21 more
The Transiting Exoplanet Survey Satellite (TESS) recently observed 18 transits of the hot Jupiter WASP-4b. The sequence of transits occurred 81.6 ± 11.7 s earlier than had been predicted, based on data stretching back to 2007. This is unlikely to be the result of a clock error, because TESS observations of other hot Jupiters (WASP-6b, 18b, and 46b…
The CIDA Variability Survey of Orion OB1. II. Demographics of the Young, Low-mass Stellar Populations
Berlind, Perry; Mateo, Mario; Bailey, John I., III +11 more
We present results of our large-scale, optical, multi-epoch photometric survey across ∼180 square degrees in the Orion OB1 association, complemented with extensive follow-up spectroscopy. Our focus is mapping and characterizing the off-cloud, low-mass, pre-main-sequence (PMS) populations. We report 2062 K- and M-type confirmed T Tauri members; 59%…
Exploring the Age-dependent Properties of M and L Dwarfs Using Gaia and SDSS
Angus, Ruth; Kiman, Rocio; Faherty, Jacqueline K. +3 more
We present a sample of 74,216 M and L dwarfs constructed from two existing catalogs of cool dwarfs spectroscopically identified in the Sloan Digital Sky Survey (SDSS). We cross-matched the SDSS catalog with Gaia DR2 to obtain parallaxes and proper motions and modified the quality cuts suggested by the Gaia Collaboration to make them suitable for l…
Anisotropy of the Milky Way’s Stellar Halo Using K Giants from LAMOST and Gaia
Bird, Sarah A.; Yang, Chengqun; Liu, Chao +3 more
The anisotropy parameter β characterizes the extent to which orbits in stellar systems are predominantly radial or tangential and is likely to constrain, for the stellar halo of the Milky Way, scenarios for its formation and evolution. We have measured β as a function of Galactocentric radius from 5 to 100 kpc for 7664 metal-poor ([Fe/H] < -1.3…