MILLIMETER DUST EMISSION IN THE GQ LUP SYSTEM

摘要

We present SubMillimeter Array observations of the GQ Lup system at 1.3 mm wavelength with 0'.'4 (-60 AU)resolution. Emission is detected from the position of the primary star, GQ Lup A, and is marginally resolved. Noemission is detected from the substellar companion, GQ Lup B, 0'.'7 away. These data, together with models of thespectral energy distribution, suggest a compact disk around GQ Lup A with mass —3 Al hip, perhaps truncated bytidal forces. There is no evidence for a gap or hole in the disk that might be the signature of an additional innercompanion body capable of scattering GQ Lup B out to —100 AU separation from GQ Lup A. For GQ Lup B tohave formed in situ, the disk must have been much more massive and extended.