Search for common proper motion wide substellar companions to young nearby stars with Vista Hemisphere Survey.

  1. P. Chinchilla
  2. V. J. Sánchez Béjar
  3. N. Lodieu
  4. B. Gauza
  5. M. R. Zapatero Osorio
  6. R. Rebolo
  7. A. Pérez Garrido 1
  1. 1 Universidad Politécnica de Cartagena
    info

    Universidad Politécnica de Cartagena

    Cartagena, España

    ROR https://ror.org/02k5kx966

Proceedings:
20th Cambridge Workshop: Cool Stars, Stellar Systems, and the Sun: Cambridge, del 29 de julio al 3 de agosto de 2018

Year of publication: 2018

Type: Conference paper

GOOGLE SCHOLAR

Abstract

We have performed a search for substellar objects as common proper motion companions to young nearby stars (including Young Moving Groups such as TW Hya, Tuc-Hor, Beta Pic, and associations such as Upper Scorpius) up to separations of 50,000 AU, using the VISTA VHS survey and 2MASS astrometric and photometric data. We have found tens of candidates with spectral types from M to L, and estimated masses from low-mass stars to the deuterium-burning limit. For some of these candidates, we have also obtained optical and/or near-infrared spectroscopy confirming them as true companions. We will present the preliminary results of our searches and discuss the most outstanding cases. Our results show that the frequency of young companions is higher than the field.