Journal
ASTRONOMY & ASTROPHYSICS
Volume 582, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201527031
Keywords
open clusters and associations: individual: TW Hya; protoplanetary disks; stars: evolution; stars: pre-main sequence
Categories
Funding
- FONDECYT [3130520, 3150550, 3140393]
- Chilean Ministry of Economy [RC130007]
- National Science Foundation [AST-1108950]
- NASA Astrophysics Data Analysis Program [NNX12H37G]
- STFC [ST/K001051/1]
- STFC [ST/K001051/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1108950] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/K001051/1] Funding Source: researchfish
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We carried out an ALMA survey of 15 confirmed or candidate low-mass (<0.2 M-circle dot) members of the TW Hya Association (TWA) with the goal of detecting molecular gas in the form of CO emission, as well as of 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 1.3 mm continuum emission around 4 systems (TWA 30B, 32, 33, and 34), suggesting the presence of cold dust grains. All continuum sources are unresolved. TWA 34 further shows (CO)-C-12(2-1) emission whose velocity structure is indicative of Keplerian rotation. Among the sample of known similar to 7-10 Myr-old star/disk systems, TWA 34, which lies just similar to 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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