Issue |
A&A
Volume 582, October 2015
|
|
---|---|---|
Article Number | L5 | |
Number of page(s) | 5 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201527031 | |
Published online | 08 October 2015 |
An ALMA survey for disks orbiting low-mass stars in the TW Hya Association
1
Departamento de AstronomíaUniversidad de Chile,
Casilla 36-D,
Santiago,
Chile
e-mail:
drodrigu@das.uchile.cl
2 Millennium Nucleus Protoplanetary Disks, Chile
3
Center for Imaging Science, School of Physics & Astronomy,
and Laboratory for Multiwavelength Astrophysics, Rochester Institute of
Technology, 54 Lomb Memorial
Drive, Rochester,
NY
14623,
USA
4
Department of Physics and Astronomy, University of
Toledo, 2801 W. Bancroft
St., Toledo,
OH
43606,
USA
5
Department of Terrestrial Magnetism, Carnegie Institution of
Washington, 5241 Broad Branch Road
NW, Washington,
DC
20015,
USA
6
Imperial College London, 1010 Blackett Lab., Prince Consort
Road, London
SW7 2AZ,
UK
7
Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego
Portales, Av. Ejercito
441, Santiago,
Chile
Received: 22 July 2015
Accepted: 14 September 2015
We carried out an ALMA survey of 15 confirmed or candidate low-mass (<0.2 M⊙) 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 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.
Key words: open clusters and associations: individual: TW Hya / protoplanetary disks / stars: evolution / stars: pre-main sequence
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.