Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9

Abstract

In a search for common proper motion companions using the VISTA Hemisphere Survey and 2MASS catalogs we have identified a very red (J-Ks=2.47 mag) late-L dwarf companion of a previously unrecognized M dwarf VHS J125601.92-125723.9, located at a projected angular separation of 8.06"+/-0.03". From low-resolution optical and near-IR spectroscopy we classified the primary and the companion as an M7.5+/-0.5 and L7+/-1.5, respectively. The primary shows weaker alkali lines than field dwarfs of similar spectral type, but still consistent with either a high-gravity dwarf or a younger object of hundreds of millions of years. The secondary shows spectral features characteristic for low surface gravity objects at ages below several hundred Myr, like the triangular shape of the H-band continuum and alkali lines weaker than in field dwarfs of the same spectral type. The absence of lithium in the atmosphere of the primary and the likely membership to the Local Association allowed us to constrain the age of the system to the range of 150-300 Myr. We report a measurement of the trigonometric parallax pi=78.8+/-6.4 mas, which translates into a distance of 12.7+/-1.0 pc; the pair thus has a projected physical separation of 102+/-9 AU. We derived the Lbol of the components and compared them with theoretical evolutionary models to estimate the masses and effective temperatures. For the primary, we determined log(Lbol/LSun)=-3.14+/-0.10, and a mass of 73 (+20,-15} MJup at the boundary between stars and brown dwarfs and Teff of 2620+/-140 K. For the companion we obtained log(Lbol/LSun)=-5.05+/-0.22 and a mass of 11.2 (+9.7,-1.8) MJup placing it near the deuterium-burning mass limit. The effective temperature derived from evolutionary models is 880 (+140,-110) K, about 400-700 K cooler than expected for field late-L dwarfs.

19 pages, 13 figures. Accepted for publication in ApJ

References in corpus (18)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• Discovery of Two T Dwarf Companions with the Spitzer Space Telescope
• A VLBI Resolution of the Pleiades Distance Controversy
• Young Nearby Loose Associations
• Discovery of a wide planetary-mass companion to the young M3 star GU Psc
• Finding benchmark brown dwarfs to probe the IMF as a function of time
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• Trigonometric parallaxes of young field L dwarfs
• Pleiades low-mass brown dwarfs: the cluster L dwarf sequence
• Southern Infrared Proper Motion Survey II: A sample of low mass stars with μ> 0.1''/yr
• SIMP J2154-1055: A New Low-Gravity L4$\beta$ Brown Dwarf Candidate Member of the Argus Association
• Precise Radial Velocities of 2046 Nearby FGKM Stars and 131 Standards
• The ages of L dwarfs

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