SIMBAD references

2011ApJ...732L..29R - Astrophys. J., 732, L29 (2011/May-2)

The ultra cool brown dwarf companion of WD 0806-661B: age, mass, and formation mechanism.


Abstract (from CDS):

We have combined multi-epoch images from the Infrared Side Port Imager on the CTIO 4 m telescope to derive a 3σ limit of J = 21.7 for the ultra cool brown dwarf companion to WD 0806-661 (GJ 3483). We find that J - [4.5] > 4.95, redder than any other brown dwarf known to date. With theoretical evolutionary models and ages 1.5-2.7 Gyr, we estimate the brown dwarf companion to have mass <10-13 MJup and temperature ≲ 400 K, providing evidence that this is among the coolest brown dwarfs currently known. The range of masses for this object is consistent with that anticipated from Jeans-mass fragmentation and we present this as the likely formation mechanism. However, we find that substellar companions of similar mass (∼7-17 MJup) are distributed over a wide range of semimajor axes, which suggests that giant planet and low-mass brown dwarf formation overlap in this mass range.

Abstract Copyright:

Journal keyword(s): binaries: visual - brown dwarfs - planetary systems

Simbad objects: 32

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