SIMBAD references

2015ApJ...806..254A - Astrophys. J., 806, 254 (2015/June-3)

BANYAN. VI. Discovery of a companion at the brown dwarf/planet-mass limit to a Tucana-Horologium M dwarf.

ARTIGAU E., GAGNE J., FAHERTY J., MALO L., NAUD M.-E., DOYON R., LAFRENIERE D. and BELETSKY Yu.

Abstract (from CDS):

We report the discovery of a substellar companion to 2MASS J02192210-3925225, a young M6 γ candidate member of the Tucana-Horologium association (30-40 Myr). This L4 γ companion has been discovered with seeing-limited direct imaging observations; at a 4{#8243} separation (160 AU) and a modest contrast ratio, it joins the very short list of young low-mass companions amenable to study without the aid of adaptive optics, enabling its characterization with a much wider suite of instruments than is possible for companions uncovered by high-contrast imaging surveys. With a model-dependent mass of 12-15 MJup, it straddles the boundary between the planet and brown dwarf mass regimes. We present near-infrared spectroscopy of this companion and compare it to various similar objects uncovered in the last few years. The J0219-3925 system falls in a sparsely populated part of the host mass versus mass ratio diagram for binaries; the dearth of known similar companions may be due to observational biases in previous low-mass companion searches.

Abstract Copyright:

Journal keyword(s): brown dwarfs - stars: late-type - stars: low-mass

Simbad objects: 23

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2019.10.14-21:15:23

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