Extrasolar planets in stellar multiple systems
T. Roell (1), A. Seifahrt (1,2,3), R. Neuh\"auser (1), M. Mugrauer (1), ((1) Astrophysical Institute, University Observatory, Jena, Germany, (2), Physics Department, University of California, Davis, USA, (3) Department of, Astronomy, Astrophysics, University of Chicago, USA)
TL;DR
This study investigates how the presence of stellar companions affects exoplanet properties, revealing a lower multiplicity rate among host stars and correlations between stellar separation and planetary characteristics.
Contribution
It provides the first comprehensive analysis of exoplanet host star multiplicity, updating the catalog with 15 new systems and examining the influence of stellar companions on planet properties.
Findings
Multiplicity rate of exoplanet hosts is about 12%, lower than general stellar population.
Planetary mass decreases as the separation between host star and companion increases.
Updated catalog includes 15 new exoplanet systems in multiple star systems.
Abstract
Analyzing exoplanets detected by radial velocity or transit observations, we determine the multiplicity of exoplanet host stars in order to study the influence of a stellar companion on the properties of planet candidates. Matching the host stars of exoplanet candidates detected by radial velocity or transit observations with online multiplicity catalogs in addition to a literature search, 57 exoplanet host stars are identified having a stellar companion. The resulting multiplicity rate of at least 12 percent for exoplanet host stars is about four times smaller than the multiplicity of solar like stars in general. The mass and the number of planets in stellar multiple systems depend on the separation between their host star and its nearest stellar companion, e.g. the planetary mass decreases with an increasing stellar separation. We present an updated overview of exoplanet candidates in…
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