جهت دسترسی به کاربرگه ی زیر، از این لینک استفاده کنید. http://dl.pgu.ac.ir/handle/Hannan/83024
Title: An ALMA survey for disks orbiting low-mass stars in the TW Hya Association
Keywords: Science & Technology;Physical Sciences;Astronomy & Astrophysics;open clusters and associations: individual: TW Hya;protoplanetary disks;stars: evolution;stars: pre-main sequence;HYDRAE ASSOCIATION;CIRCUMSTELLAR DISKS;PROTOPLANETARY DISKS;BROWN DWARF;KINEMATIC GROUPS;BP-PISCIUM;YOUNG SUNS;X-RAY;NEARBY;DUST;Astronomy & Astrophysics;0201 Astronomical And Space Sciences
Issue Date: 1-Feb-2017
8-Oct-2015
14-Sep-2015
Publisher: Imperial College Trust;EDP Sciences
Description: 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.
URI: http://dx.doi.org/10.1051/0004-6361/201527031
Other Identifiers: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000363538500132&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
1432-0746
http://hdl.handle.net/10044/1/43866
N/A
Type Of Material: Other
Appears in Collections:Physics

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