An ALMA Survey for Disks Orbiting Low-Mass Stars in the TW Hya Association

Kavli Affiliate: David Principe

| First 5 Authors: David R. Rodriguez, Gerrit van der Plas, Joel H. Kastner, Adam C. Schneider, Jacqueline K. Faherty

| Summary:

We have carried out an ALMA survey of 15 confirmed or candidate low-mass
(<0.2M$_odot$) members of the TW Hya Association (TWA) with the goal of
detecting molecular gas in the form of CO emission, as well as providing
constraints on continuum emission due to cold dust. Our targets have spectral
types of M4-L0 and hence represent the extreme low end of the TWA’s mass
function. Our ALMA survey has yielded detections of 1.3mm continuum emission
around 4 systems (TWA 30B, 32, 33, & 34), suggesting the presence of cold dust
grains. All continuum sources are unresolved. TWA 34 further shows 12CO(2-1)
emission whose velocity structure is indicative of Keplerian rotation. Among
the sample of known ~7-10 Myr-old star/disk systems, TWA 34, which lies just
~50 pc from Earth, is the lowest mass star thus far identified as harboring
cold molecular gas in an orbiting disk.

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