ANALYSIS OF THE HIPPARCOS MEASUREMENTS OF υ ANDROMEDAE A MASS ESTIMATE OF ITS OUTEANOST KNOWN PLANETARY COMPANION

摘要

We present an analysis of Hipparcos astrometric measurements of υ Andromedae, a nearby main-sequence star around which three planet candidates have recently been discovered by means of radial velocity measurements. The stellar orbit associated with the outermost candidate has a period of 1269 ± 9 days and a minimum semimajor axis of 0.6 mas. Using the Hipparcos data together with the spectroscopic elements, we found a semimajor axis of 1.4 ± 0.6 mas. This implies a mass of 10.l_(-4.6)~(+4.7) Jupiter masses for that planet of υ And.