Discovery Of The Coldest Imaged Companion Of A Sun-like Star

Details Discovery Of The Coldest Imaged Companion Of A Sun-like Star Discovery Of The Coldest Imaged Companion Of A Sun-like Star

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560104c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #601.04; Bulletin of the American Astronomical Society, Vol. 36, p.1119

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the discovery of a brown dwarf or possible planet at a projected separation of 1.9-arcsec = 29 AU around the star GJ 758, placing it between the separations at which substellar companions are expected to form by core accretion ( 5 AU) or direct gravitational collapse (typically 100 AU). The object was detected by direct imaging of its thermal glow with Subaru/HiCIAO. At 10-40 times the mass of Jupiter and a temperature of 550-640 K, GJ 758 B constitutes one of the few known T-type companions, and the coldest ever to be imaged in thermal light around a Sun-like star. Its orbit is likely eccentric and of a size comparable to Pluto’s orbit, possibly as a result of gravitational scattering or outward migration. A candidate second companion is detected at 1.2-arcsec in one epoch. We summarize these results as well as give a status report on on-going follow-up studies of this system.

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