DISCOVERY OF THE COLDEST IMAGED COMPANION OF A SUN-LIKE STAR

2009/11/05 by Christian Thalmann, C. Thalmann, Joseph Carson +37 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.EP

paper · pdf · doi:10.1088/0004-637x/707/2/l123

published as Astrophys.J.707:L123-L127,2009 · 5 pages, 3 figures, 2 tables. Accepted for publication in ApJ Letters

arxiv created 2009/11/05 · openalex publication_date 2009/12/04 · arxiv updated 2014/11/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

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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Cited by

• Lyra [wikipedia]