A Distant Stellar Companion in the Upsilon Andromedae System

Details A Distant Stellar Companion in the Upsilon Andromedae System A Distant Stellar Companion in the Upsilon Andromedae System

2002-05-16

arxiv.org/abs/astro-ph/0205277v1

Astrophys.J. 572 (2002) L79

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to be published in June ApJ Letters

Scientific paper

10.1086/341554

Upsilon Andromedae is an F8V star known to have an extrasolar system of at least 3 planets in orbit around it. Here we report the discovery of a low-mass stellar companion to this system. The companion shares common proper motion, lies at a projected separation of ~750 AU, and has a spectral type of M4.5V. The effect of this star on the radial velocity of the brighter primary is negligible, but this system provides an interesting testbed for stellar planetary formation theory and understanding dynamical stability since it is the first multiple planetary system known in a multiple stellar system.

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