Planets in Binary Star Systems: An Input Catalog of Wide Low-mass Pairs for SIM 'Lite'

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present a sample of wide (a > 500 AU) low-mass (K5-M6) binaries that will be ideal for targeting with the Space Interferometry Mission 'Lite'(SIM) to search for both gas giant and terrestrial planets. With only a handful of planet-hosting binaries known, there is a need for systematic searches around multiple star systems if we are to understand the effects of one or more stellar companions on the formation of planets. SIM-Lite, with its sub-microarcsecond astrometry, will be in an ideal position to explore and constrain the parameter space of planet-hosting systems. The presented binaries are a sub-sample from the SLoWPoKES catalog identified from the astrometric, photometric, and kinematic data in the Sloan Digital Sky Survey, Data Release 7. Based on their masses, distances, and possible magnetic activity, we vetted the catalog for systems that are ideal for detection of terrestrial planets by SIM-lite. We also explore the possibility of using SIM-lite astrometry to calculate orbits of these very long-period binary systems.

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