An Upper Limit to the Mass of the Radial Velocity Companion to ρ1 Cancri

Details An Upper Limit to the Mass of the Radial Velocity Companion to ρ1 Cancri An Upper Limit to the Mass of the Radial Velocity Companion to ρ1 Cancri

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564l..27m&link_type=abstract

The Astrophysical Journal, Volume 564, Issue 1, pp. L27-L30.

Astronomy and Astrophysics

Astronomy

11

Astrometry, Stars: Planetary Systems, Stars: Low-Mass, Brown Dwarfs

Scientific paper

Doppler spectroscopy of ρ1 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 observing technique have placed an upper limit on the astrometric reflex motion of ρ1 Cnc in a time period of only 1 month. These observations detected no reflex motion induced by the 14.65 day period radial velocity companion, allowing us to place a 3 σ upper limit of ~0.3 mas on the semimajor axis of this motion, ruling out the preliminary Hipparcos value of 1.15 mas. The corresponding upper limit on the true mass of the companion is ~30 MJ, confirming that it is a substellar object.

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