論文

査読有り
2017年11月

A Detached Protostellar Disk around a ̃0.2 M Protostar in a Possible Site of a Multiple Star Formation in a Dynamical Environment in Taurus

The Astrophysical Journal

849
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.3847/1538-4357/aa8e9e

We report ALMA observations in 0.87 mm continuum and <SUP>12</SUP>CO (J = 3-2) toward a very low-luminosity (<0.1 L <SUB>☉</SUB>) protostar, which is deeply embedded in one of the densest cores, MC27/L1521F, in Taurus with an indication of multiple star formation in a highly dynamical environment. The beam size corresponds to ̃20 au, and we have clearly detected blueshifted/redshifted gas in <SUP>12</SUP>CO associated with the protostar. The spatial/velocity distributions of the gas show there is a rotating disk with a size scale of ̃10 au, a disk mass of ̃10<SUP>-4</SUP> M <SUB>☉</SUB>, and a central stellar mass of ̃0.2 M <SUB>☉</SUB>. The observed disk seems to be detached from the surrounding dense gas, although it is still embedded at the center of the core whose density is ̃10<SUP>6</SUP> cm<SUP>-3</SUP>. The current low-outflow activity and the very low luminosity indicate that the mass accretion rate onto the protostar is extremely low in spite of a very early stage of star formation. We may be witnessing the final stage of the formation of ̃0.2 M <SUB>☉</SUB> protostar. However, we cannot explain the observed low luminosity with the standard pre-main-sequence evolutionary track unless we assume cold accretion with an extremely small initial radius of the protostar (̃0.65 {R}<SUB>☉ </SUB>). These facts may challenge our current understanding of the low mass star formation, in particular the mass accretion process onto the protostar and the circumstellar disk....

Web of Science ® 被引用回数 : 4

リンク情報
DOI
https://doi.org/10.3847/1538-4357/aa8e9e
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000414587300021&DestApp=WOS_CPL
URL
http://orcid.org/0000-0003-3127-5982