Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published March 2017 | Submitted + Published
Journal Article Open

Binaries among low-mass stars in nearby young moving groups

Abstract

The solar galactic neighborhood contains a number of young co-moving associations of stars (known as young moving groups) with ages of ~10–150 Myr, which are prime targets for a range of scientific studies, including direct imaging planet searches. The late-type stellar populations of such groups still remain in their pre-main sequence phase, and are thus well suited for purposes such as isochronal dating. Close binaries are particularly useful in this regard since they allow for a model-independent dynamical mass determination. Here we present a dedicated effort to identify new close binaries in nearby young moving groups, through high-resolution imaging with the AstraLux Sur Lucky Imaging camera. We surveyed 181 targets, resulting in the detection of 61 companions or candidates, of which 38 are new discoveries. An interesting example of such a case is 2MASS J00302572-6236015 AB, which is a high-probability member of the Tucana-Horologium moving group, and has an estimated orbital period of less than 10 yr. Among the previously known objects is a serendipitous detection of the deuterium burning boundary circumbinary companion 2MASS J01033563-5515561 (AB)b in the z′ band, thereby extending the spectral coverage for this object down to near-visible wavelengths.

Additional Information

© 2017 ESO. Received: 23 October 2016. Accepted: 2 December 2016. M.J. gratefully acknowledges funding from the Knut and Alice Wallenberg Foundation. S.D. acknowledges support from the Northern Ireland Department of Education and Learning. The authors thank the ESO staff for their efficient support, S. Ciceri for transatlantic data transportation, and the anonymous referee for useful suggestions. This study made use of the CDS services SIMBAD and VizieR, the SAO/NASA ADS service, data from the ESA mission Gaia, and digitized archival data from the Anglo-Australian Observatory.

Attached Files

Published - aa29945-16.pdf

Submitted - 1612.02443.pdf

Files

1612.02443.pdf
Files (1.4 MB)
Name Size Download all
md5:7546f93c633321a8683549d95eda3286
723.7 kB Preview Download
md5:c05f5ec4b529e2a6e782d546b1636b6d
690.4 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023