The multiplicity of M-dwarfs in young moving groups

Yutong Shan, Jennifer C. Yee, Brendan P. Bowler, Lucas A. Cieza, Benjamin T. Montet, Héctor Cánovas, Michael C. Liu, Laird M. Close, Phil M. Hinz, Jared R. Males, Katie M. Morzinski, Amali Vaz, Vanessa P. Bailey, Katherine B. Follette

Research output: Contribution to journalArticlepeer-review

Abstract

We image 104 newly identified low-mass (mostly M-dwarf) pre-main sequence members of nearby young moving groups with Magellan Adaptive Optics (MagAO) and identify 27 binaries with instantaneous projected separation as small as 40 mas. 15 were previously unknown. The total number of multiple systems in this sample including spectroscopic and visual binaries from the literature is 36, giving a raw multiplicity rate of at least 35+54% for this population. In the separation range of roughly 1 - 300 AU in which infrared AO imaging is most sensitive, the raw multiplicity rate is at least 24+54% for binaries resolved by the MagAO infrared camera (Clio). The M-star sub-sample of 87 stars yields a raw multiplicity of at least 30+54% over all separations, 21+54% for secondary companions resolved by Clio from 1 to 300 AU (23+54% for all known binaries in this separation range). A combined analysis with binaries discovered by the Search for Associations Containing Young stars shows that multiplicity fraction as a function of mass and age over the range of 0.2 to 1.2 M and 10 - 200 Myr appears to be linearly flat in both parameters and across YMGs. This suggests that multiplicity rates are largely set by 100 Myr without appreciable evolution thereafter. After bias corrections are applied, the multiplicity fraction of low-mass YMG members (< 0.6M) is in excess of the field.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Jun 21 2017

Keywords

  • Methods: observational
  • Methods: statistical
  • Stars: binaries: visual
  • Stars: low-mass
  • Stars: pre-main sequence
  • Techniques: photometric

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'The multiplicity of M-dwarfs in young moving groups'. Together they form a unique fingerprint.

Cite this