454 citations · 7.2k across the 161 of their papers we have counts for
24 papers · 1 filter
A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A
Maude Gull, Daniel R. Weisz, Peter Senchyna +17
We characterize massive stars (M>8 M_sun) in the nearby (D~0.8 Mpc) extremely metal-poor (Z~5% Z_sun) galaxy Leo A using Hubble Space Telescope ultra-violet (UV), optical, and near…
15000 Ellipsoidal Binary Candidates in TESS: Orbital Periods, Binary Fraction, and Tertiary Companions
Matthew J. Green, Dan Maoz, Tsevi Mazeh +5
We present a homogeneously-selected sample of 15779 candidate binary systems with main sequence primary stars and orbital periods shorter than 5 days. The targets were selected fro…
A dense star in a 51-minute orbital period eclipsing binary
Kevin B. Burdge, Kareem El-Badry, Thomas R. Marsh +24
In over a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes. One way to ach…
The C/N ratio from FUV spectroscopy as a constraint upon the past evolution of HS0218+3229
O. Toloza, Boris T. Gaensicke, Laura M. Guzman-Rincon +8
Some white dwarfs accreting from non-degenerate companions show anomalous carbon and nitrogen abundances in the photospheres of their stellar components which have been postulated…
A Sun-like star orbiting a black hole
Kareem El-Badry, Hans-Walter Rix, Eliot Quataert +18
We report discovery of a bright, nearby () Sun-like star orbiting a dark object. We identified the system as a black hole candidate via its astrometri…
Triage of the Gaia DR3 astrometric orbits. I. A sample of binaries with probable compact companions
Sahar Shahaf, Dolev Bashi, Tsevi Mazeh +4
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…
Magnetic braking saturates: evidence from the orbital period distribution of low-mass detached eclipsing binaries from ZTF
Kareem El-Badry, Charlie Conroy, Jim Fuller +4
We constrain the orbital period () distribution of low-mass detached main-sequence eclipsing binaries (EBs) with light curves from the Zwicky Transient Facility (ZTF),…
An X-ray quiet black hole born with a negligible kick in a massive binary within the Large Magellanic Cloud
Tomer Shenar, Hugues Sana, Laurent Mahy +35
Stellar-mass black holes are the final remnants of stars born with more than 15 solar masses. Billions are expected to reside in the Local Group, yet only few are known, mostly det…
Gaia Spectroscopic Orbits Validated with LAMOST and GALAH Radial Velocities
Dolev Bashi, Sahar Shahaf, Tsevi Mazeh +5
The recently published Gaia DR3 catalog of 181327 spectroscopic binaries (SB) includes the Keplerian elements of each orbit but not the measured radial velocities (RVs) and their e…
What are the spectroscopic binaries with high mass functions near the Gaia DR3 main sequence?
Kareem El-Badry, Hans-Walter Rix
The 3rd data release of the Gaia mission includes orbital solutions for single-lined spectroscopic binaries, representing more than an order of magnitude increase in sampl…
The gravitational redshift of solar-type stars from Gaia DR3 wide binaries
Kareem El-Badry
Light escaping from a gravitational potential suffers a redshift with magnitude proportional to the depth of the potential. This "gravitational redshift" is easily measurable in de…
ET White Paper: To Find the First Earth 2.0
Jian Ge, Hui Zhang, Weicheng Zang +163
We propose to develop a wide-field and ultra-high-precision photometric survey mission, temporarily named "Earth 2.0 (ET)". This mission is designed to measure, for the first time,…
Discovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-ray Catalog
Antonio C. Rodriguez, Shrinivas R. Kulkarni, Thomas A. Prince +14
Magnetic CVs are luminous Galactic X-ray sources but have been difficult to find in purely optical surveys due to their lack of outburst behavior. The eROSITA telescope aboard the…
Spectroscopy of TOI-1259B -- an unpolluted white dwarf companion to an inflated warm Saturn
Evan Fitzmaurice, David V. Martin, Romy Rodriguez Martinez +7
TOI-1259 consists of a transiting exoplanet orbiting a main sequence star, with a bound outer white dwarf companion. Less than a dozen systems with this architecture are known. We…
Testing White Dwarf Age Estimates using Wide Double White Dwarf Binaries from Gaia EDR3
Tyler M. Heintz, J. J. Hermes, Kareem El-Badry +4
White dwarf (WD) stars evolve simply and predictably, making them reliable age indicators. However, self-consistent validation of the methods for determining WD total ages has yet…
Wide twin binaries are extremely eccentric: evidence of twin binary formation in circumbinary disks
Hsiang-Chih Hwang, Kareem El-Badry, Hans-Walter Rix +3
The Gaia mission recently revealed an excess population of equal-mass "twin" wide binaries, with mass ratio , extending to separations of at least 1000 AU. The origi…
Formation of proto-globular cluster candidates in cosmological simulations of dwarf galaxies at
Omid Sameie, Michael Boylan-Kolchin, Philip F. Hopkins +8
We perform cosmological hydrodynamical simulations to study the formation of proto-globular cluster candidates in progenitors of present-day dwarf galaxies $(M_{\rm vir} \approx 10…
Unicorns and Giraffes in the binary zoo: stripped giants with subgiant companions
Kareem El-Badry, Rhys Seeburger, Tharindu Jayasinghe +5
We analyze two binary systems containing giant stars, V723 Mon ("the Unicorn") and 2M04123153+6738486 ("the Giraffe"). Both giants orbit more massive but less luminous companions,…
Improving white dwarfs as chronometers with Gaia parallaxes and spectroscopic metallicities
Adam Moss, Ted von Hippel, Elliot Robinson +9
White dwarfs (WDs) offer unrealized potential in solving two problems in astrophysics: stellar age accuracy and precision. WD cooling ages can be inferred from surface temperatures…
Public data release of the FIRE-2 cosmological zoom-in simulations of galaxy formation
Andrew Wetzel, Christopher C. Hayward, Robyn E. Sanderson +23
We describe a public data release of the FIRE-2 cosmological zoom-in simulations of galaxy formation, available at http://flathub.flatironinstitute.org/fire, from the Feedback In R…
NGC 2004 #115: a black hole imposter containing three luminous stars
Kareem El-Badry, Kevin B. Burdge, Przemek Mróz
NGC 2004 #115 is a recently identified black hole (BH) candidate in the Large Magellanic Cloud (LMC) containing a B star orbiting an unseen companion in a 2.9 day orbit and Be star…
The "Giraffe": Discovery of a stripped red giant in an interacting binary with a lower giant
T. Jayasinghe, Todd A. Thompson, C. S. Kochanek +13
We report the discovery of a stripped giant + lower giant binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object-star binaries. 2M0412 i…
Hot-mode accretion and the physics of thin-disk galaxy formation
Zachary Hafen, Jonathan Stern, James Bullock +16
We use FIRE simulations to study disk formation in z~0, Milky Way-mass galaxies, and conclude that a key ingredient for the formation of thin stellar disks is the ability for accre…
Birth of a Be star: an APOGEE search for Be stars forming through binary mass transfer
Kareem El-Badry, Charlie Conroy, Eliot Quataert +7
Motivated by recent suggestions that many Be stars form through binary mass transfer, we searched the APOGEE survey for Be stars with bloated, stripped companions. From a well-defi…