Search Publications
TESS Hunt for Young and Maturing Exoplanets (THYME). IX. A 27 Myr Extended Population of Lower Centaurus Crux with a Transiting Two-planet System
Vanderburg, Andrew; Latham, David W.; Quinn, Samuel N. +35 more
We report the discovery and characterization of a nearby (~85 pc), older (27 ± 3 Myr), distributed stellar population near Lower Centaurus Crux (LCC), initially identified by searching for stars comoving with a candidate transiting planet from TESS (HD 109833; TOI 1097). We determine the association membership using Gaia kinematics, color-magnitud…
The Absolute Age of M92
Chaboyer, Brian; Boylan-Kolchin, Michael; Weisz, Daniel +3 more
The absolute age of a simple stellar population is of fundamental interest for a wide range of applications but is difficult to measure in practice, as it requires an understanding of the uncertainties in a variety of stellar evolution processes as well as the uncertainty in the distance, reddening, and composition. As a result, most studies focus…
A Unified Treatment of Kepler Occurrence to Trace Planet Evolution. I. Methodology
Dattilo, Anne; Batalha, Natalie M.; Bryson, Steve
We present Kepler exoplanet occurrence rates for planets between 0.5 and 16 R ⊕ and between 1 and 400 days. To measure occurrence, we use a nonparametric method via a kernel density estimator and use bootstrap random sampling for uncertainty estimation. We use a full characterization of completeness and reliability measurements from the…
The Giant Accreting Protoplanet Survey (GAPlanetS)-Results from a 6 yr Campaign to Image Accreting Protoplanets
Weinberger, Alycia J.; De Rosa, Robert J.; Macintosh, Bruce +21 more
Accreting protoplanets are windows into planet formation processes, and high-contrast differential imaging is an effective way to identify them. We report results from the Giant Accreting Protoplanet Survey (GAPlanetS), which collected Hα differential imagery of 14 transitional disk host stars with the Magellan Adaptive Optics System. To address t…
The Far Side of the Galactic Bar/Bulge Revealed through Semi-regular Variables
Huber, Daniel; Saunders, Nicholas; Bedding, Timothy R. +8 more
The Galactic bulge is critical to our understanding of the Milky Way. However, due to the lack of reliable stellar distances, the structure and kinematics of the bulge/bar beyond the Galactic center have remained largely unexplored. Here, we present a method to measure distances of luminous red giants using a period-amplitude-luminosity relation a…
Mid-to-late M Dwarfs Lack Jupiter Analogs
Latham, David W.; Berlind, Perry; Calkins, Michael L. +6 more
Cold Jovian planets play an important role in sculpting the dynamical environment in which inner terrestrial planets form. The core accretion model predicts that giant planets cannot form around low-mass M dwarfs, although this idea has been challenged by recent planet discoveries. Here, we investigate the occurrence rate of giant planets around l…
Discovery of a New Local Group Dwarf Galaxy Candidate in UNIONS: Boötes V
Smith, Simon E. T.; Hayes, Christian R.; Sestito, Federico +12 more
We present the discovery of Boötes V, a new ultra-faint dwarf galaxy (UFD) candidate. This satellite is detected as a resolved overdensity of stars during an ongoing search for new Local Group dwarf galaxy candidates in the UNIONS photometric data set. It has a physical half-light radius of ${26.9}_{-5.4}^{+7.5}$ pc, a V-band magnitude of -4.5 ± 0…
The Orbital Architecture of Qatar-6: A Fully Aligned Three-body System?
Rice, Malena; Howard, Andrew W.; Dai, Fei +5 more
The evolutionary history of an extrasolar system is, in part, fossilized through its planets' orbital orientations relative to the host star's spin axis. However, spin-orbit constraints for warm Jupiters-particularly in binary star systems, which are amenable to a wide range of dynamical processes-are relatively scarce. We report a measurement of …
The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems
Gies, Douglas R.; Wang, Luqian; Peters, Geraldine J. +1 more
Close binary interactions may play a critical role in the formation of the rapidly rotating Be stars. Mass transfer can result in a mass gainer star spun up by the accretion of mass and angular momentum, while the mass donor is stripped of its envelope to form a hot and faint helium star. Far-UV spectroscopy has led to the detection of about 20 su…
Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b
Fu, Guangwei; Brogi, Matteo; Désert, Jean-Michel +10 more
We present high-resolution dayside thermal emission observations of the exoplanet KELT-20b/MASCARA-2b using the MAROON-X spectrograph. Applying the cross-correlation method with both empirical and theoretical masks and a retrieval analysis, we confirm previous detections of Fe I emission lines and we detect Ni I for the first time in the planet (a…