Constraints on the HL Tauri Protostellar Disk from Millimeter‐ and Submillimeter‐Wave Interferometry

Abstract

Millimeter and submillimeter interferometry is used to probe the dusty accretion disks around young protostars. New 460 GHz (j \ 650 km) data from the Caltech Submillimeter Observatory and the James Clerk Maxwell Telescope CSO-JCMT Interferometer are combined with previous 345 GHz (j \ 870 km) data from CSO-JCMT, 220 GHz (j \ 1.4 mm) data from the Owens Valley Radio Observatory (OVRO) Millimeter Array, 110 GHz (j \ 2.7 mm) data from the Berkeley-Illinois-Maryland Association Array (BIMA), and 43 GHz (j \ 7 mm) data from the VLA, in order to constrain the nature of the protostellar disk around HL Tau on size scales of 50 AU and above. A power-law disk model is tted directly to the measured visibility data, and probability distributions are derived for the parameters. The e ects of instrumental uncertainties are included in a consistent way.