A Molecular Disk Survey of Low-Mass Stars in the TW Hya Association

摘要

We have carried out an ALMA Cycle 2 survey of 15 confirmed or candidate low-mass (< 0.2M_⊙) members of the TW Hya Association (TWA) with the goal of detecting line emission from CO molecular gas and continuum emission from cold dust. Our targets have spectral types of M4-L0 and hence represent the extreme low end of the TWA's mass function. The survey has yielded a detection of ~(12)CO(2-1) emission around TWA 34. This newly discovered ?10 Myr-old molecular gas disk lies just ?50pc from Earth.