Binaries among low-mass stars in nearby young moving groups

TL;DR

This study identifies new close binary systems in nearby young moving groups using high-resolution imaging, providing valuable data for stellar and planetary formation research.

Contribution

It presents the first dedicated high-resolution imaging survey of 181 targets in young moving groups, discovering 38 new binary candidates and providing detailed orbital and spectral information.

Findings

Detected 61 companions or candidates, 38 of which are new discoveries.

Identified a close binary with an orbital period under 10 years.

Extended spectral coverage of a circumbinary companion down to near-visible wavelengths.

Abstract

The solar galactic neighbourhood contains a number of young co-moving associations of stars (so-called `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 population 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 years. 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.