SIMBAD references

2019MNRAS.490.5088M - Mon. Not. R. Astron. Soc., 490, 5088-5102 (2019/December-3)

Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release.


Abstract (from CDS):

A new survey is presented, which explores the second data release of the ESA-Gaia mission, in order to search for stellar companions of exoplanet host stars, located at distances closer than about 500 pc around the Sun. In total, 176 binaries, 27 hierarchical triples, and one hierarchical quadruple system are detected among more than 1300 exoplanet host stars, whose multiplicity is investigated, yielding a multiplicity rate of the exoplanet host stars of at least about 15 per cent. The detected companions and the exoplanet host stars are equidistant and share a common proper motion, as it is expected for gravitationally bound stellar systems, proven with their accurate Gaia astrometry. The companions exhibit masses in the range between about 0.078 and 1.4 M with a peak in their mass distribution between 0.15 and 0.3 M. The companions are separated from the exoplanet host stars by about 20 up to 9100 au, but are found most frequently within a projected separation of 1000 au. While most of the detected companions are early M dwarfs, eight white dwarf companions of exoplanet host stars are also identified in this survey, whose true nature is revealed with their photometric properties. Hence, these degenerated companions and the exoplanet host stars form evolved stellar systems with exoplanets, which have survived (physically but also dynamically) the post-main-sequence evolution of their former primary star.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: high angular resolution - binaries: visual - stars: imaging - stars: individual: (HD8535B, HD118904B, HIP116454B, Kepler-779B, WASP-98B) - white dwarfs

VizieR on-line data: <Available at CDS (J/MNRAS/490/5088): table2.dat table3.dat table4.dat>

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 214

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