Discovery of a widely separated ultracool dwarf-white dwarf binary

Details Discovery of a widely separated ultracool dwarf-white dwarf binary Discovery of a widely separated ultracool dwarf-white dwarf binary

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.388..838d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 388, Issue 2, pp. 838-848.

Astronomy and Astrophysics

Astronomy

11

Binaries: General, Stars: Low-Mass, Brown Dwarfs, White Dwarfs

Scientific paper

We present the discovery of the widest known ultracool dwarf-white dwarf binary. This binary is the first spectroscopically confirmed widely separated system from our target sample. We have used the Two-Micron All-Sky Survey (2MASS) and SuperCOSMOS archives in the southern hemisphere, searching for very widely separated ultracool dwarf-white dwarf binaries, and find one common proper motion system, with a separation of 3650-5250au at an estimated distance of 41-59pc, making it the widest known system of this type. Spectroscopy reveals 2MASS J0030-3740 is a DA white dwarf with Teff = 7600 +/- 100K, log(g) = 7.79-8.09 and MWD = 0.48-0.65Msolar. We spectroscopically type the ultracool dwarf companion (2MASS J0030-3739) as M9+/-1 and estimate a mass of 0.07-0.08Msolar,Teff = 2000-2400K and log(g) = 5.30-5.35, placing it near the mass limit for brown dwarfs. We estimate the age of the system to be >1.94Gyr (from the white dwarf cooling age and the likely length of the main-sequence lifetime of the progenitor) and suggest that this system and other such wide binaries can be used as benchmark ultracool dwarfs.

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