Search Publications
Massive Stars in Molecular Clouds Rich in High-energy Sources: The Bridge of G332.809-0.132 and CS 78 in NGC 6334
Menten, Karl M.; Figer, Donald F.; Messineo, Maria +1 more
Detections of massive stars in the direction of the H II region CS 78 in NGC 6334 and of G332.809-0.132 are here presented. The region covered by the G332.809-0.132 complex coincides with the RCW 103 stellar association. In its core (40' in radius), approximately 110 OB candidate stars (Ks < 10 mag and 0.4 < ${A}_{{K}_{s}}$ < 1…
Detecting Exoplanets Using Eclipsing Binaries as Natural Starshades
Zabludoff, Ann I.; Guyon, Olivier; Bellotti, Stefano +2 more
We investigate directly imaging exoplanets around eclipsing binaries using the eclipse as a natural tool for dimming the binary and thus increasing the planet to star brightness contrast. At eclipse, the binary becomes pointlike, making coronagraphy possible. We select binaries where the planet-star contrast would be boosted by >10× during ecli…
The Improved Orbit Solution and Component Masses of bet LMi
Wang, Xiaoli; Fu, Yanning; Xia, Fang
bet LMi is a double-lined visual binary with an orbital period of ∼39 yr. Via a simultaneous fitting to both astrometric and radial velocity measurements, we give a complete and improved orbit solution with high precision. Then, the component masses are precisely determined as 2.98 ± 0.10 M⊙ and 1.92 ± 0.04 M⊙ with a relative…
A New Moving Group in the Local Arm
Zhao, Gang; Chen, Yuqin; Zhao, Jingkun +5 more
We present a new moving group clustered in kinematics, spatial position, and elemental abundances. Its spatial position is around the center of the Local Arm of the Milky Way. A convergent point method was taken to select candidate member stars. Among 206 candidate member stars, 74 are pre-main-sequence stars and some of them have stellar disks. W…
Serendipitous Discovery of a Physical Binary Quasar at z = 1.76
Geier, S.; Fynbo, J. P. U.; Heintz, K. E. +7 more
Binary quasars are extremely rare objects, used to investigate clustering on very small scales at different redshifts. The cases where the two quasar components are gravitationally bound, known as physical binary quasars, can also exhibit enhanced astrophysical activity and therefore are of particular scientific interest. Here we present the seren…
KR Persei, a Mid-F Eclipsing Binary with a One-day Period
Fekel, Francis C.; Muterspaugh, Matthew W.; Sowell, James R. +5 more
KR Per is a partially eclipsing binary with an orbital period of 0.9960798 days, very close to one sidereal day, making it difficult to obtain extensive phase coverage in a reasonable amount of time. We used the Wilson-Devinney program to determine its orbital elements and stellar absolute dimensions from recently acquired radial velocities and di…
Analytic Marginalization of Absorption Line Continua
Tchernyshyov, Kirill
Absorption line spectroscopy is a powerful way of measuring properties of stars and the interstellar medium. Absorption spectra are often analyzed manually, an approach that limits reproducibility and which cannot practically be applied to modern data sets consisting of thousands or even millions of spectra. Simultaneous probabilistic modeling of …
Overview of the DESI Legacy Imaging Surveys
Castander, Francisco J.; Gaztanaga, Enrique; Bell, Eric F. +158 more
The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image ≈14,000 deg2 of the extragalactic sky visible from the northern h…
The Revised TESS Input Catalog and Candidate Target List
Torres, Guillermo; Barclay, Thomas; Ge, Jian +34 more
We describe the catalogs assembled and the algorithms used to populate the revised TESS Input Catalog (TIC), based on the incorporation of the Gaia second data release. We also describe a revised ranking system for prioritizing stars for 2 minute cadence observations, and we assemble a revised Candidate Target List (CTL) using that ranking. The TI…
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au
Burrows, Adam; Fortney, Jonathan J.; Duchêne, Gaspard +63 more
We present a statistical analysis of the first 300 stars observed by the Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections and our contrast curves we infer the underlying distributions of substellar companions with respect to their mass, semimajor axis, and host stella…