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2MASSW J0746425+200322: Is the Secondary a Star or Brown Dwarf?

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John E. Gizis1 and I. Neill Reid2

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2MASSW J0746425+200322 is the first L dwarf system with a dynamical mass determination. It has been claimed that the system is young (<500 Myr) and that therefore the secondary is clearly substellar. We argue that the balance of evidence suggests the system is old; the secondary is likely either a star or a long-lived transition object.


Keywords

binaries: general; stars: fundamental parameters; stars: individual (2MASSW J0746425+200322); stars: low-mass, brown dwarfs


Dates

Issue 1 (2006 January)

Received 2005 February 3, accepted for publication 2005 September 19



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