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

2009-11-05

arxiv.org/abs/0911.1127v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, 3 figures, 2 tables. Accepted for publication in ApJ Letters

Scientific paper

We present the discovery of a brown dwarf or possible planet at a projected separation of 1.9" = 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" at one epoch.

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