Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Arenou, Frédéric"'
Autor:
El-Badry, Kareem, Rix, Hans-Walter, Quataert, Eliot, Howard, Andrew W., Isaacson, Howard, Fuller, Jim, Hawkins, Keith, Breivik, Katelyn, Wong, Kaze W. K., Rodriguez, Antonio C., Conroy, Charlie, Shahaf, Sahar, Mazeh, Tsevi, Arenou, Frédéric, Burdge, Kevin B., Bashi, Dolev, Faigler, Simchon, Weisz, Daniel R., Seeburger, Rhys, Monter, Silvia Almada, Wojno, Jennifer
We report discovery of a bright, nearby ($G = 13.8;\,\,d = 480\,\rm pc$) Sun-like star orbiting a dark object. We identified the system as a black hole candidate via its astrometric orbital solution from the Gaia mission. Radial velocities validated
Externí odkaz:
http://arxiv.org/abs/2209.06833
Autor:
Shahaf, Sahar, Bashi, Dolev, Mazeh, Tsevi, Faigler, Simchon, Arenou, Frédéric, El-Badry, Kareem, Rix, Hans-Walter
In preparation for the release of the astrometric orbits of Gaia, Shahaf et al. (2019) proposed a triage technique to identify astrometric binaries with compact companions based on their astrometric semi-major axis, parallax, and primary mass. The te
Externí odkaz:
http://arxiv.org/abs/2209.00828
Autor:
Halbwachs, Jean-Louis, Pourbaix, Dimitri, Arenou, Frédéric, Galluccio, Laurent, Guillout, Patrick, Bauchet, Nathalie, Marchal, Olivier, Sadowski, Gilles, Teyssier, David
Publikováno v:
A&A 674, A9 (2023)
Context.The Gaia Early Data Release 3 contained the positions, parallaxes and proper motions of 1.5 billion sources, among which some did not fit well the "single star" model. Binarity is one of the causes of this. Aims. Four million of these stars w
Externí odkaz:
http://arxiv.org/abs/2206.05726
Autor:
Hammer, François, Wang, Jianling, Pawlowski, Marcel, Yang, Yanbin, Bonifacio, Piercarlo, Li, Hefan, Babusiaux, Carine, Arenou, Frédéric
Here we show that precise Gaia EDR3 proper motions have provided robust estimates of 3D velocities, angular momentum and total energy for 40 Milky Way dwarfs. The results are statistically robust and are independent of the Milky Way mass profile. Dwa
Externí odkaz:
http://arxiv.org/abs/2109.11557
Publikováno v:
A&A 657, A7 (2022)
The multiplicity fraction of stars, down to the substellar regime, is a parameter of fundamental importance for stellar formation, evolution, and planetology. The census of multiple stars in the solar neighborhood is however incomplete. Our study is
Externí odkaz:
http://arxiv.org/abs/2109.10912
Autor:
Li, Hefan, Hammer, Francois, Babusiaux, Carine, Pawlowski, Marcel S., Yang, Yanbin, Arenou, Frederic, Du, Cuihua, Wang, Jianling
Based on Gaia Early Data Release 3 (EDR3), we estimate the proper motions for 46 dwarf spheroidal galaxies (dSphs) of the Milky Way. The uncertainties in proper motions, determined by combining both statistical and systematic errors, are smaller by a
Externí odkaz:
http://arxiv.org/abs/2104.03974
Autor:
Breuval, Louise, Kervella, Pierre, Wielgórski, Piotr, Gieren, Wolfgang, Graczyk, Dariusz, Trahin, Boris, Pietrzyński, Grzegorz, Arenou, Frédéric, Javanmardi, Behnam, Zgirski, Bartlomiej
The Cepheid Period-Luminosity (PL) relation is the key tool for measuring astronomical distances and for establishing the extragalactic distance scale. In particular, the local value of the Hubble constant ($H_0$) strongly depends on Cepheid distance
Externí odkaz:
http://arxiv.org/abs/2103.10894
Autor:
Hammer, Francois, Yang, Yanbin, Arenou, Frederic, Li, Hefan, Wang, Jianling, Bonifacio, Piercarlo, Babusiaux, Carine, Jiao, Yongjun
Publikováno v:
University of Kansas Libraries, 2020-12-23, Proceedings of the 3rd World Summit on Exploring the Dark Side of the Universe (EDSU2020): March 9-13, 2020, Guadeloupe Islands, P.229
Milky Way dwarf spheroidal galaxies are the tiniest observed galaxies and are currently associated with the largest fractions of dark matter, which is revealed by their too large velocity dispersions. However, most of them are found near their orbita
Externí odkaz:
http://arxiv.org/abs/2009.11935
Autor:
Breuval, Louise, Kervella, Pierre, Anderson, Richard I., Riess, Adam G., Arenou, Frédéric, Trahin, Boris, Mérand, Antoine, Gallenne, Alexandre, Gieren, Wolfgang, Storm, Jesper, Bono, Giuseppe, Pietrzyński, Grzegorz, Nardetto, Nicolas, Javanmardi, Behnam, Hocdé, Vincent
Publikováno v:
A&A 643, A115 (2020)
Classical Cepheids provide the foundation for the empirical extragalactic distance ladder. Milky Way Cepheids are the only stars in this class accessible to trigonometric parallax measurements. However, the parallaxes of Cepheids from the second Gaia
Externí odkaz:
http://arxiv.org/abs/2006.08763
Autor:
Halbwachs, Jean-Louis, Kiefer, Flavien, Lebreton, Yveline, Boffin, Henri M. J., Arenou, Frédéric, Bouquin, Jean-Baptiste Le, Famaey, Benoît, Pourbaix, Dimitri, Guillout, Patrick, Salomon, Jean-Baptiste, Mazeh, Tsevi
Double-lined spectroscopic binaries (SB2s) are one of the main sources of stellar masses, as additional observations are only needed to give the inclinations of the orbital planes in order to obtain the individual masses of the components. For this r
Externí odkaz:
http://arxiv.org/abs/2006.01467