Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7802b&link_type=abstract
American Astronomical Society Meeting 210, #78.02; Bulletin of the American Astronomical Society, Vol. 39, p.185
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on our investigation of the upsilon Andromedae planetary system. Using high-cadence, high-precision, iodine-cell radial velocities from the Hobby-Eberly Telescope to confirm the existence of previously known companions, and to search for previously unknown companions, we determine period, time of periastron passage, eccentricity, RV amplitude, and longitude of periastron for each attendant planet. Simultaneously, we make use of Hubble Space Telescope Fine Guidance Sensor millisecond of arc precision astrometry to establish perturbation size, orbital inclination, and actual mass for the outer-most, longest-period companion. We discuss progress made towards establishing the degree of co-planarity of two of the planetary mass companions to upsilon Andromedae. This work is supported by NASA through the Space Telescope Science Institute General Observer program; grants GO-09407, -09971, -10103, -10610, and -10989.
Bean Jacob L.
Benedict George F.
McArthur Barbara E.
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