Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Kareem El-Badry"'
Autor:
Kareem El-Badry, Hans-Walter Rix, David W. Latham, Sahar Shahaf, Tsevi Mazeh, Allyson Bieryla, Lars A. Buchhave, René Andrae, Natsuko Yamaguchi, Howard Isaacson, Andrew W. Howard, Alessandro Savino, Ilya V. Ilyin
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
We report discovery and spectroscopic follow-up of 21 astrometric binaries containing solar-type stars and dark companions with masses near 1.4 $M_{\odot}$. The simplest interpretation is that the companions are dormant neutron stars (NSs), though ul
Externí odkaz:
https://doaj.org/article/cbe59678c2674f21ba2f43dc8c790f75
Autor:
Kareem El-Badry
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
A $33\,M_\odot$ black hole (BH) was recently discovered in an 11.6-year binary only 590 pc from the Sun. The system, Gaia BH3, contains a $0.8\,M_\odot$ low-metallicity giant ($\rm [M/H]=-2.2$) that is a member of the ED-2 stellar stream. This paper
Externí odkaz:
https://doaj.org/article/f75f187963f549d3896681c272c77990
Autor:
Kareem El-Badry, Joshua D. Simon, Henrique Reggiani, Hans-Walter Rix, David W. Latham, Allyson Bieryla, Lars A. Buchhave, Sahar Shahaf, Tsevi Mazeh, Sukanya Chakrabarti, Puragra Guhathakurta, Ilya V. Ilyin, Thomas M. Tauris
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\pm 0.04\,M_{\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up o
Externí odkaz:
https://doaj.org/article/feba1a58792147db80f02c475007d249
Autor:
Zexuan Wu, Subo Dong, Tuan Yi, Zhuokai Liu, Kareem El-Badry, Andrew Gould, L. Wyrzykowski, K. A. Rybicki, Etienne Bachelet, Grant W. Christie, L. de Almeida, L. A. G. Monard, J. McCormick, Tim Natusch, P. Zieliński, Huiling Chen, Yang Huang, Chang Liu, A. Mérand, Przemek Mróz, Jinyi Shangguan, Andrzej Udalski, J. Woillez, Huawei Zhang, Franz-Josef Hambsch, P. J. Mikołajczyk, M. Gromadzki, M. Ratajczak, Katarzyna Kruszyńska, N. Ihanec, Uliana Pylypenko, M. Sitek, K. Howil, Staszek Zola, Olga Michniewicz, Michal Zejmo, Fraser Lewis, Mateusz Bronikowski, Stephen Potter, Jan Andrzejewski, Jaroslav Merc, Rachel Street, Akihiko Fukui, R. Figuera Jaimes, V. Bozza, P. Rota, A. Cassan, M. Dominik, Y. Tsapras, M. Hundertmark, J. Wambsganss, K. Bąkowska, A. Słowikowska
Publikováno v:
The Astronomical Journal, Vol 168, Iss 2, p 62 (2024)
We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with ${M}_{{\rm{
Externí odkaz:
https://doaj.org/article/13d1199627a54a9cb497ca946f70ca7c
Autor:
Gautham Adamane Pallathadka, Vedant Chandra, Nadia L. Zakamska, Hsiang-Chih Hwang, Yossef Zenati, J. J. Hermes, Kareem El-Badry, Boris T. Gänsicke, Sean Morrison, Nicole R. Crumpler, Stefan Arseneau
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 1, p 42 (2024)
We report the discovery of SDSS J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (>1 M _⊙ at 2 σ confidence) companion with a period of 36 hr. We use a combination of spectroscopy, including data from the
Externí odkaz:
https://doaj.org/article/62a13503445a400e8b6597480272c441
Autor:
Stefan Arseneau, Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska, Gautham Adamane Pallathadka, Nicole R. Crumpler, J. J. Hermes, Kareem El-Badry, Hans-Walter Rix, Keivan G. Stassun, Boris T. Gänsicke, Joel R. Brownstein, Sean Morrison
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 1, p 17 (2024)
Measuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 13
Externí odkaz:
https://doaj.org/article/15bbd847e35f4c6c9de1df2a48d4f385
Publikováno v:
The Open Journal of Astrophysics, Vol 6 (2023)
Externí odkaz:
https://doaj.org/article/c6a8bf40be90411596edacc909bc02a6
Autor:
David R. Miller, Ilaria Caiazzo, Jeremy Heyl, Harvey B. Richer, Kareem El-Badry, Antonio C. Rodriguez, Zachary P. Vanderbosch, Jan van Roestel
Publikováno v:
The Astrophysical Journal Letters, Vol 956, Iss 2, p L41 (2023)
We searched the Gaia DR3 database for ultramassive white dwarfs with kinematics consistent with having escaped the nearby Hyades open cluster, identifying three such candidates. Two of these candidates have masses estimated from Gaia photometry of ap
Externí odkaz:
https://doaj.org/article/cca25499123b4e4ca3f006a6a05c5390
Autor:
Kevin B. Burdge, Kareem El-Badry, Saul Rappaport, Tin Long Sunny Wong, Evan B. Bauer, Lars Bildsten, Ilaria Caiazzo, Deepto Chakrabarty, Emma Chickles, Matthew J. Graham, Erin Kara, S. R. Kulkarni, Thomas R. Marsh, Melania Nynka, Thomas A. Prince, Robert A. Simcoe, Jan van Roestel, Zach Vanderbosch, Eric C. Bellm, Richard G. Dekany, Andrew J. Drake, George Helou, Frank J. Masci, Jennifer Milburn, Reed Riddle, Ben Rusholme, Roger Smith
Publikováno v:
The Astrophysical Journal Letters, Vol 953, Iss 1, p L1 (2023)
We report the discovery of ZTF J0127+5258, a compact mass-transferring binary with an orbital period of 13.7 minutes. The system contains a white dwarf accretor, which likely originated as a post–common envelope carbon–oxygen (CO) white dwarf, an
Externí odkaz:
https://doaj.org/article/ace38e716fd44f759b9684510b6f4082
Autor:
Antonio C. Rodriguez, Ilkham Galiullin, Marat Gilfanov, Shrinivas R. Kulkarni, Irek Khamitov, Ilfan Bikmaev, Jan van Roestel, Lev Yungelson, Kareem El-Badry, Rashid Sunayev, Thomas A. Prince, Mikhail Buntov, Ilaria Caiazzo, Andrew Drake, Mark Gorbachev, Matthew J. Graham, Rustam Gumerov, Eldar Irtuganov, Russ R. Laher, Frank J. Masci, Pavel Medvedev, Josiah Purdum, Nail Sakhibullin, Alexander Sklyanov, Roger Smith, Paula Szkody, Zachary P. Vanderbosch
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 1, p 63 (2023)
AM Canum Venaticorum (AM CVn) systems are ultracompact binaries where a white dwarf accretes from a helium-rich degenerate or semidegenerate donor. Some AM CVn systems will be among the loudest sources of gravitational waves for the upcoming Laser In
Externí odkaz:
https://doaj.org/article/30bbbb9bafa348229cb69047cc5d04e4