AN ASTROMETRIC SEARCH FOR A SUB-STELLAR COMPANION OF THE M8.5 DWARF TVLM 513-46546 USING VERY LONG BASELINE INTERFEROMETRY

作者：Forbrich Jan^*; Berger Edo; Reid Mark J

来源：Astrophysical Journal, 2013, 777(1): 70.

DOI：10.1088/0004-637X/777/1/70

• brown dwarfs
• planetary systems
• radio continuum: stars
• stars: low-mass

We conducted multi-epoch very long baseline interferometry observations to search for astrometric reflex motion that would be caused by a sub-stellar companion of the M8.5 dwarf TVLM 513-46546. The observations yield an absolute parallax corresponding to a distance of 10.762+/-0.027 pc and a proper motion of 78.09+/-0.17 mas yr(-1). The averaged flux density per epoch varies by a factor of at least three. From the absence of significant residual motion, we place an upper limit on any reflex motion caused by a companion, extending the parameter space covered by previous near-infrared direct-imaging searches. The data exclude a phase space of companion masses and orbital periods ranging from 3.8 M-Jup with an orbital radius of similar to 0.05 AU (and an orbital period of 16 days) to 0.3 M-Jup with an orbital radius of similar to 0.7 AU (and an orbital period of 710 days).

• 出版日期2013-11-1