Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0504g&link_type=abstract
American Astronomical Society Meeting 208, #5.04; Bulletin of the American Astronomical Society, Vol. 38, p.83
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the preliminary results of a continuing VLT program to map the orbit of the nearby binary L4.5 dwarf GJ 1001BC (LHS 102BC). Since discovering its duplicity in 2002 and 2003 using HST's NICMOS and ACS, we have obtained high-resolution images of GJ 1001BC at three epochs between October 2004 and November 2005 using the NAOS/CONICA system at VLT-UT4 (Yepun). Our HST and VLT images cover 75% of GJ 1001BC's 4 year orbit. A least-squares fit of a Keplerian orbit yields a combined binary mass of 0.100 ± 0.026 M&sun; for a tentative parallactic distance measurement of 13.0 ± 0.7 pc to the M dwarf GJ 1001A. Assuming a 3:2 mass ratio for the nearly equal-luminosity L dwarfs, we estimate masses of 0.060 ± 0.016 M&sun; and 0.040 ± 0.010 M&sun; for GJ 1001B and C, respectively. If these preliminary values are sustained by our continuing orbit and parallax measurements, then GJ 1001C will be the least massive L dwarf for which a dynamical mass has been measured.
Ford Holland C.
Golimowski David A.
Henry Todd J.
~Minniti Dante
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