Zobrazeno 1 - 10
of 271
pro vyhledávání: '"Lépine, Sébastien"'
Here we present speckle observations of 16 low-separation ($s<30$ AU) high probability candidate binaries from the catalog by Medan et al., where secondaries typically lack astrometric solutions in Gaia. From these speckle observations, we find a sec
Externí odkaz:
http://arxiv.org/abs/2404.02976
Autor:
Medan, Ilija, Lépine, Sébastien
We present a method to identify likely visual binaries in Gaia eDR3 that does not rely on parallax or proper motion. This method utilizes the various PSF sizes of 2MASS/Gaia, where at $<2.5$" two stars may be unresolved in 2MASS but resolved by Gaia.
Externí odkaz:
http://arxiv.org/abs/2310.02256
Autor:
Medan, Ilija, Lépine, Sébastien
We combine photometric metallicities with astrometry from Gaia DR3 to examine the chemodynamic structure of ~250,000 K dwarfs in the Solar Neighborhood (SN). In kinematics, we observe ridges/clumps of "kinematic groups", like studies of more massive
Externí odkaz:
http://arxiv.org/abs/2209.11331
Over the past decade, the number of known wide binary systems has exponentially expanded thanks to the release of data from the Gaia Mission. Some of these wide binary systems are actually higher-order multiples, where one of the components is an unr
Externí odkaz:
http://arxiv.org/abs/2205.13715
We present a model-fit pipeline to determine the stellar parameters of M-type dwarfs, which is an improvement upon our previous work described in Hejazi et al. 2020. We apply this pipeline to analyze the low-resolution (R~2000) spectra of 3745 M dwar
Externí odkaz:
http://arxiv.org/abs/2201.07460
Autor:
Kim, Bokyoung, Lépine, Sebastien
We present a catalogue of 551,214 main-sequence stars in the local ($d < 2$ kpc) Galactic thick disk and halo, based on a search of stars with large proper motions ($\mu_{\mathrm{tot}} > 40.0$ mas/yr) in the Gaia Early Data Release 3. We derive photo
Externí odkaz:
http://arxiv.org/abs/2112.07419
We use halo dwarf stars with photometrically determined metallicities that are located within 2 kpc of the Sun to identify local halo substructure. The kinematic properties of these stars do not indicate a single, dominant radial merger event (RME).
Externí odkaz:
http://arxiv.org/abs/2110.11465
Autor:
Lim, Dongwook, Koch-Hansen, Andreas J., Hansen, Camilla Juul, Lépine, Sebastien, Marshall, Jennifer L., Wilkinson, Mark I., Peñarrubia, Jorge
Publikováno v:
A&A 655, A26 (2021)
Recently, an increasing number of wide binaries has been discovered. Their chemical and dynamical properties are studied through extensive surveys and pointed observations. However, the formation of these wide binaries is far from clear, although sev
Externí odkaz:
http://arxiv.org/abs/2108.08850
We present a Bayesian method to cross-match 5,827,988 high proper motion Gaia sources ($\mu>40 \ mas \ yr^{-1}$) to various photometric surveys: 2MASS, AllWISE, GALEX, RAVE, SDSS and Pan-STARRS. To efficiently associate these objects across catalogs,
Externí odkaz:
http://arxiv.org/abs/2102.10210
Publikováno v:
The Astrophysical Journal, 899:83 (17 pp), 2020
We present a catalog of 531 white dwarf candidates that have large apparent transverse motions relative to the Sun ($v_{T} > 200$ km s$^{-1}$), thus making them likely members of the local Galactic halo population. The candidates were selected from t
Externí odkaz:
http://arxiv.org/abs/2007.05153