SIMBAD references

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 T_eff= 7600±100K, log(g) = 7.79-8.09 and M_WD= 0.48-0.65M_☉. We spectroscopically type the ultracool dwarf companion (2MASS J0030-3739) as M9±1 and estimate a mass of 0.07-0.08M_☉,T_eff= 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.