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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…