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07 February 2025
 
  » arxiv » astro-ph/0112036

 Article overview



An Upper Limit to the Mass of rho1 Cnc's Radial Velocity Companion
Melissa A. McGrath ; Edmund Nelan ; David C. Black ; George Gatewood ; Keith Noll ; Al Schultz ; Stephen Lubow ; Inwoo Han ; Tomasz F. Stepinski ; Thomas Targett ;
Date 3 Dec 2001
Subject astro-ph
AbstractDoppler 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.
Source arXiv, astro-ph/0112036
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