NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Astrometric discovery of GJ 802b : in the Brown Dwarf Oasis?The Stellar Planet Survey is an ongoing astrometric search for giant planets and brown dwarfs around a sample of ~30 M dwarfs. We have discovered several low-mass companions by measuring the motion of our target stars relative to their reference frames. The lowest mass discovery thus far is GJ 802b, a companion to the M5 dwarf GJ 802A. The orbital period is 3.14 +/-0:03 yr, the system mass is 0:214 +/- 0:045 M(circled dot operator), and the semimajor axis is 1:28+/- 0:10 AU or 81 + 6 mas. Imaging observations indicate that GJ 802b is likely to be a brow with the astrometrically determined mass 0:058 +/- 0:021 M(circled dot operator) (1 (sigma) limits). The remaining uncertainty in the orbit is the eccentricity that is now loosely constrained. We dis the system age limits the mass and the prospects of further narrowing the mass range when e is more precisely determined.
Document ID
20060044027
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Pravdo, Steven H.
Shaklan, Stuart B.
Lloyd, James
Date Acquired
August 23, 2013
Publication Date
September 1, 2005
Publication Information
Publication: The Astrophysical Journal
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other
Keywords
stars : low mass
brown dwarfs

Available Downloads

There are no available downloads for this record.
No Preview Available