Search Publications
A Candidate High-velocity Exoplanet System in the Galactic Bulge
Lu, Jessica R.; Cole, Andrew A.; Beaulieu, Jean-Philippe +11 more
We present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens with an exomoon companion or a very low-mass star with a planetary companion in the Galactic bulge. The ∼10 yr b…
The Hottest Neptunes Orbit Metal-rich Stars
Behmard, Aida; Vissapragada, Shreyas
The Neptune desert is no longer empty. A handful of close-in planets with masses between those of Neptune and Saturn have now been discovered, and their puzzling properties have inspired a number of interesting theories on the formation and evolution of desert-dwellers. While some studies suggest that Neptune desert planets form and evolve similar…
Disk in the Circumstellar Envelope of Carbon Mira V Cygni
Strakhov, Ivan A.; Shenavrin, Victor I.; Safonov, Boris S. +2 more
Asymptotic giant branch (AGB) stars are the primary source of dust and complex molecules in the interstellar medium. The determination of outflow parameters is often hindered by the unknown geometry of the circumstellar environment, creating a demand for high-angular resolution observations. We use our near-infrared spectra and photometry of the c…
The Orbits of Uranus, Its Satellites and Rings, the Gravity Field of the Uranian System, and the Orientation of the Poles of Uranus and Its Satellites
Jacobson, Robert A.; Park, Ryan S.
R. A. Jacobson determined the orbits of the Uranian satellites, the masses of Uranus and its satellites, and the orientation of the pole of Uranus from Earth-based astrometry, Earth-based ring occultations, and observations acquired with the Voyager 2 spacecraft. Subsequent to that publication, several observers obtained new astrometry, and some o…
Mind the Gap. II. The Near-UV Fluxes of M Dwarfs
Youngblood, Allison; Jao, Wei-Chun
Because of the continuous variations in mass, metallicity, and opacity, dwarf stars are distributed along the main sequence on optical and near-IR color–magnitude diagrams following a smooth polynomial. In this study, utilizing a catalog of crossmatched Galaxy Evolution Explorer (GALEX) and Gaia sources, we identify two distinct populations of M d…
Detection of Semidetached Eclipsing Binaries from TESS
Ding, Xu; Ji, KaiFan; Cheng, QiYuan +4 more
Semidetached binaries, distinguished by their mass transfer phase, play a crucial role in elucidating the physics of mass transfer within interacting binary systems. To identify these systems in eclipsing binary light curves provided by large-scale time-domain surveys, we have developed a methodology by training two distinct models that establish …
LAMOST Reveals Long-lived Protoplanetary Disks
Fang, Min; Liu, Yao; Wang, Xiao-Long +2 more
While both observations and theories demonstrate that protoplanetary disks are not expected to live much longer than ∼10 Myr, several examples of prolonged disks have been observed in the past. In this work, we perform a systematic search for aged young stellar objects still surrounded by protoplanetary disks in the M-star catalog from the LAMOST …
The SDSS-V Local Volume Mapper: Data Analysis Pipeline
Bizyaev, Dmitry; Blanc, Guillermo A.; Wofford, Aida +10 more
We introduce the data analysis pipeline (DAP) for the Sloan Digital Sky Survey V Local Volume Mapper (LVM) project, referred to as the LVM-DAP. We outline our methods for recovering both stellar and emission-line components from optical integral field spectroscopy, highlighting the developments and changes implemented to address specific challenge…
AstroSat/UVIT Far- and Near-UV Deep Field Around IC 4329A
Dewangan, Gulab C.; Ganguly, Piyali; Rani, Priyanka
We present high-resolution near-ultraviolet (NUV) and far-ultraviolet (FUV) deep imaging of the field around the Seyfert galaxy IC 4329A based on five observations performed with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. The long exposures of 82.9 ks in the NUV (N245M; λmean = 2447 Å; Δλ = 270 Å) and 92.2 ks in the FUV…
On the Orbit of the Binary Brown Dwarf Companion GL229 Ba and Bb
Henning, Thomas; Mérand, Antoine; Johnstone, Doug +21 more
The companion GL229B was recently resolved by Xuan et al. as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry and Very Large Telescope-CRIRES+ radial velocity (RV) measurements. Here, we present Bayesian models of the interferometric and RV data in additional detail, along with an updated outer orbit of the brown …