Ultracool companions to high proper motion stars from the VISTA Hemisphere Survey

  1. B. Gauza
  2. V. J. S. Béjar
  3. Antonio Pérez Garrido 1
  4. N. Lodieu
  5. R. Rebolo
  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

Wide (>50 AU) ultracool companions in binary and multiple systems play an important rolein substellar studies, because properties such as distance, metallicity and age can be inferred from the brighter, and more easily characterizable, primary star. This in turn allows amore thorough characterization and offers the opportunity to better understand their physical and chemical properties. This talk will discuss the search for very low-mass stars andbrown dwarfs as co-moving companions to high proper motion stars in the VISTA HemisphereSurvey (VHS), and present the newly identified and spectroscopically characterized systemsfound within the early VHS data covering about 8,500 square degrees. Within these systemswe found over a dozen of new late M, L and T dwarf companions at angular separations from7 to 800 arcsec, corresponding to wide orbits ranging from ∼100 to tens of thousands AUand masses from very-low mass stars down to planetary mass regime.