The PHASES Differential Astrometry Data Archive. III. Limits to Tertiary Companions

Details The PHASES Differential Astrometry Data Archive. III. Limits to Tertiary Companions The PHASES Differential Astrometry Data Archive. III. Limits to Tertiary Companions

2010-10-19

arxiv.org/abs/1010.4044v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

16 pages, Accepted to AJ

Scientific paper

The Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) monitored 51 subarcsecond binary systems to evaluate whether tertiary companions as small as Jovian planets orbited either the primary or secondary stars, perturbing their otherwise smooth Keplerian motions. Twenty-one of those systems were observed 10 or more times and show no evidence of additional companions. A new algorithm is presented for identifying astrometric companions and establishing the (companion mass)-(orbital period) combinations that can be excluded from existence with high confidence based on the PHASES observations, and the regions of mass-period phase space being excluded are presented for 21 PHASES binaries.

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