| | |
| | |
Stat |
Members: 3645 Articles: 2'504'928 Articles rated: 2609
26 April 2024 |
|
| | | |
|
Article overview
| |
|
The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). II. Multiplicity of Protostars in the Perseus Molecular Cloud | John J. Tobin
; Leslie W. Looney
; Zhi-Yun Li
; Claire J. Chandler
; Michael M. Dunham
; Dominique Segura-Cox
; Sarah I. Sadavoy
; Carl Melis
; Robert J. Harris
; Kaitlin Kratter
; Laura Perez
; | Date: |
4 Jan 2016 | Abstract: | We present a multiplicity study of all known protostars (94) in the Perseus
molecular cloud from a Karl G. Jansky Very Large Array (VLA) survey at Ka-band
(8 mm and 1 cm) and C-band (4 cm and 6.6 cm). The observed sample has a
bolometric luminosity range between 0.1 L$_{odot}$ and $sim$33 L$_{odot}$,
with a median of 0.7 L$_{odot}$. This multiplicity study is based on the
Ka-band data, having a best resolution of $sim$0.065" (15 AU) and separations
out to $sim$43" (10000 AU) can be probed. The overall multiplicity fraction
(MF) is found to be of 0.40$pm$0.06 and the companion star fraction (CSF) is
0.71$pm$0.06. The MF and CSF of the Class 0 protostars are 0.57$pm$0.09 and
1.2$pm$0.2, and the MF and CSF of Class I protostars are both 0.23$pm$0.08.
The distribution of companion separations appears bi-modal, with a peak at
$sim$75 AU and another peak at $sim$3000 AU. Turbulent fragmentation is
likely the dominant mechanism on $>$1000 AU scales and disk fragmentation is
likely to be the dominant mechanism on $<$200 AU scales. Toward three Class 0
sources we find companions separated by $<$30 AU. These systems have the
smallest separations of currently known Class 0 protostellar binary systems.
Moreover, these close systems are embedded within larger (50 AU to 400 AU)
structures and may be candidates for ongoing disk fragmentation. | Source: | arXiv, 1601.0692 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |