The Frequency of Wide Companions to Planet-Host Stars: A New Wide Brown Dwarf Companion

摘要

The aim of the project is to improve our knowledge of the multiplicity of planet-host stars at wide physical separations. We cross-matched approximately 6,200 square degrees imaged by the Visible Infrared Survey Telescope for Astronomy (VISTA) Hemisphere Survey (VHS) with the Two Micron All Sky Survey (2MASS) to look for wide common proper motion companions to known planet-host stars. We report two new stellar M dwarf companions as well as a T4.5 dwarf companion, at 6.3 arcmin (~9,000 au) from the K7V star HIP 70849, yielding stellar and substellar frequencies of 5.4 ± 3.8% and 2.7 ± 2.7% (lσ), respectively. We refer the reader to our refereed paper (Lodieu et al. 2014) for more detailed information on the results.