An Upper Limit to the Mass of rho1 Cnc's Radial Velocity Companion

Details An Upper Limit to the Mass of rho1 Cnc's Radial Velocity Companion An Upper Limit to the Mass of rho1 Cnc's Radial Velocity Companion

2001-12-03

arxiv.org/abs/astro-ph/0112036v1

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures, 1 table

Scientific paper

Doppler spectroscopy of rho1 Cnc has detected evidence of a companion with an orbital period of 14.65 days and a minimum mass of 0.88 Jupiter masses. Astrometric observations performed with the Hubble Space Telescope Fine Guidance Sensor 1r using a novel new observing technique have placed an upper limit on the astrometric reflex motion of rho1 Cnc in a time period of only one month. These observations detected no reflex motion induced by the 14.65 day period radial velocity companion, allowing us to place a 3-sigma upper limit of \~0.3 milliarcseconds on the semi-major axis of this motion, ruling out the preliminary Hipparcos value of 1.15 milliarcseconds. The corresponding upper limit on the true mass of the companion is ~30 Mj, confirming that it is a sub-stellar object.

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