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A catalog of nearby accelerating star candidates in Gaia DR3
Marc L. Whiting, Joshua B. Hill, Benjamin C. Bromley +1
We describe a new catalog of accelerating star candidates with Gaia mag and distances pc. Designated as Gaia Nearby Accelerating Star Catalog (GNASC), it con…
Anisotropy of Halo Main Sequence Turnoff Stars Measured with New MMT Radial Velocities and Gaia Proper Motions
Charles King, Warren R. Brown, Margaret J. Geller +1
We measure the anisotropy of the Milky Way stellar halo traced by a dense sample of 18<r<21 mag F-type main sequence turnoff stars using Gaia eDR3 proper motions and new radial vel…
Nearby high-speed stars in Gaia DR2
Benjamin C. Bromley, Scott J. Kenyon, Warren R. Brown +1
We investigate the nature of nearby (10-15 kpc) high-speed stars in the Gaia DR2 archive identified on the basis of parallax, proper motion and radial velocity. Together with a con…
Stellar Velocity Dispersion and Anisotropy of the Milky Way Inner Halo
Charles King, Warren R. Brown, Margaret J. Geller +1
We measure the three components of velocity dispersion, , for stars within 6 < R < 30 kpc of the Milky Way using a new radial velocity sample from the MMT telescope.…
The Runaway Binary LP 400-22 is Leaving the Galaxy
Mukremin Kilic, A. Gianninas, Warren R. Brown +7
We present optical spectroscopy, astrometry, radio, and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial v…
The Nature of Hypervelocity Stars and the Time Between Their Formation and Ejection
Warren R. Brown, Judith G. Cohen, Margaret J. Geller +1
We obtain Keck HIRES spectroscopy of HVS5, one of the fastest unbound stars in the Milky Way halo. We show that HVS5 is a 3.62 +- 0.11 Msun main sequence B star at a distance of 50…
The ELM Survey. IV. 24 White Dwarf Merger Systems
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +4
We present new radial velocity and X-ray observations of extremely low-mass (ELM, 0.2 Msol) white dwarf candidates in the Sloan Digital Sky Survey (SDSS) Data Release 7 area. We id…
Binary Disruption by Massive Black Holes: Hypervelocity Stars, S Stars, and Tidal Disruption Events
Benjamin C. Bromley, Scott J. Kenyon, Margaret J. Geller +1
We examine whether disrupted binary stars can fuel black hole growth. In this mechanism, tidal disruption produces a single hypervelocity star (HVS) ejected at high velocity and a…
MMT Hypervelocity Star Survey. II. Five New Unbound Stars
Warren R. Brown, Margaret J. Geller, Scott J. Kenyon
We present the discovery of five new unbound hypervelocity stars (HVSs) in the outer Milky Way halo. Using a conservative estimate of Galactic escape velocity, our targeted spectro…
Identifying Star Streams in the Milky Way Halo
Charles King, Warren R. Brown, Margaret J. Geller +1
We develop statistical methods for identifying star streams in the halo of the Milky Way galaxy that exploit observed spatial and radial velocity distributions. Within a great circ…
SDSS J163030.58+423305.8: A 40 minute Orbital Period Detached White Dwarf Binary
Mukremin Kilic, Warren R. Brown, J. J. Hermes +4
We report the discovery of a new detached, double white dwarf system with an orbital period of 39.8 min. We targeted SDSS J163030.58+423305.8 (hereafter J1630) as part of our radia…
A 12 minute Orbital Period Detached White Dwarf Eclipsing Binary
Warren R. Brown, Mukremin Kilic, J. J. Hermes +3
We have discovered a detached pair of white dwarfs (WDs) with a 12.75 min orbital period and a 1,315 km/s radial velocity amplitude. We measure the full orbital parameters of the s…
The Shortest Period Detached Binary White Dwarf System
Mukremin Kilic, Warren R. Brown, S. J. Kenyon +6
We identify SDSS J010657.39-100003.3 (hereafter J0106-1000) as the shortest period detached binary white dwarf (WD) system currently known. We targeted J0106-1000 as part of our ra…
The Binary Fraction of Low Mass White Dwarfs
Justin M. Brown, Mukremin Kilic, Warren R. Brown +1
We describe spectroscopic observations of 21 low-mass (<0.45 M_sun) white dwarfs (WDs) from the Palomar-Green Survey obtained over four years. We use both radial velocities and inf…
The ELM Survey. II. Twelve Binary White Dwarf Merger Systems
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +3
We describe new radial velocity and X-ray observations of extremely low-mass white dwarfs (ELM WDs, ~0.2 Msol) in the Sloan Digital Sky Survey Data Release 4 and the MMT Hyperveloc…
The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
Warren R. Brown, Mukremin Kilic, Carlos Allende Prieto +1
We analyze radial velocity observations of the 12 extremely low-mass <0.25 Msol white dwarfs (WDs) in the MMT Hypervelocity Star Survey. Eleven of the 12 WDs are binaries with orbi…
The Merger Rate of Extremely Low Mass White Dwarf Binaries: Links to the Formation of AM CVn Stars and Underluminous Supernovae
Warren R. Brown, Mukremin Kilic, Carlos Allende Prieto +1
We study a complete, colour-selected sample of double-degenerate binary systems containing extremely low mass (ELM) <0.25 Msol white dwarfs (WDs). We show, for the first time, that…
Accurate Masses for the Primary and Secondary in the Eclipsing White Dwarf Binary NLTT 11748
Mukremin Kilic, Carlos Allende Prieto, Warren R. Brown +3
We measure the radial velocity curve of the eclipsing detached white dwarf binary NLTT 11748. The primary exhibits velocity variations with a semi-amplitude of 273 km/s and an orbi…
A Galactic Center Origin for HE 0437-5439, the Hypervelocity Star near the Large Magellanic Cloud
Warren R. Brown, Jay Anderson, Oleg Y. Gnedin +4
We use Hubble Space Telescope imaging to measure the absolute proper motion of the hypervelocity star (HVS) HE 0437-5439, a short-lived B star located in the direction of the Large…
The Mass Profile of the Galaxy to 80 kpc
Oleg Y. Gnedin, Warren R. Brown, Margaret J. Geller +1
The Hypervelocity Star survey presents the currently largest sample of radial velocity measurements of halo stars out to 80 kpc. We apply spherical Jeans modeling to these data in…
Velocity Dispersion Profile of the Milky Way Halo
Warren R. Brown, Margaret J. Geller, Scott J. Kenyon +1
We present a spectroscopic sample of 910 distant halo stars from the Hypervelocity Star survey from which we derive the velocity dispersion profile of the Milky Way halo. The sampl…
Runaway Stars, Hypervelocity Stars, and Radial Velocity Surveys
Benjamin C. Bromley, Scott J. Kenyon, Warren R. Brown +1
Runaway stars ejected from the Galactic disk populate the halo of the Milky Way. To predict the spatial and kinematic properties of runaways, we inject stars into a Galactic potent…
The Runaway White Dwarf LP400-22 Has a Companion
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +4
We report the detection of a radial velocity companion to the extremely low mass white dwarf LP400-22. The radial velocity of the white dwarf shows variations with a semi-amplitude…