NOAO >   Observing Info >   Approved Programs >   2006A-0064

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Proposal Information for 2006A-0064


PI: Thomas Harrison, New Mexico State University, tharriso@nmsu.edu
Address: Astronomy Department, Box 30001/MSC4500, Las Cruces, NM 88003, USA

CoI: Fritz Benedict, University of Texas
CoI: Geoff Marcy, University of California, Berkeley
CoI: Debra Fischer, San Francisco State University
CoI: Paul Butler, Carnegie Institution of Washington
CoI: Doug Hoffman, New Mexico State University
CoI: Jillian Bornak, New Mexico State University
CoI: Joseph Wellhouse, New Mexico State University

Title: Astrometric Masses of Extrasolar Planets and Brown Dwarfs

Abstract: We have a large, 108 orbit, HST program in Cycles 14 and 15 to estimate the astrometric elements (perturbation orbit, semi-major axis, and inclination) of the extra-solar planets orbiting six stars. These companions were originally detected through radial velocity measurements. We have demonstrated that the Fine Guidance Sensors on the HST can obtain astrometry of the reflex motion of the parent star that, when combined with the radial velocity data, yields useful inclination information allowing us to derive companion masses. To obtain useful reflex data, however, requires that we obtain accurate parallaxes to the parent star. This requires optical spectroscopy and photometry of the reference frame stars to measure spectroscopic parallaxes. We request three nights with the RCSP on the KPNO 4 m to obtain spectroscopy of the reference frame stars for three of the six program objects.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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