Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.4201c&link_type=abstract
American Astronomical Society, DPS meeting #36, #42.01; Bulletin of the American Astronomical Society, Vol. 36, p.1171
Astronomy and Astrophysics
Astronomy
Scientific paper
The High Resolution Spectrograph on the Hobby-Eberly Telescope is now routinely producing stellar radial velocities with a precision of 2-3 meters/second. This velocity precision, coupled with queue-mode observing, has allowed us to detect planetary companions to two stars: HD 37605 and ρ 1 Cancri. The companion to HD 37605 has a minimum mass of 2.84 Jupiter masses. The planet is in a 54.23 day orbit of e = 0.737. The queue-scheduled operation of the Hobby-Eberly Telescope enabled us to discovery of this relatively short-period planet with a total observation time span of just two orbital periods. We have also discovered a fourth planet in orbit around ρ 1 Cancri. This planet has a 2.81 day orbital period, and a minimum mass of 14.21 Earth masses. This is the lowest m sin i of all of the extrasolar planets yet found. Analysis of Hubble Space Telescope Fine Guidance Sensor measurements together with all available ground-based radial velocity data gives a probable inclination for the outer planet ρ 1 Cancri d of 53o. Assuming coplanarity for all of the planets in the system, we then get a most probable mass for the new inner planet of 17.7 Earth masses. This planet may be a ``missing link'' in the planetary formation scenarios - a close-in Neptune-mass rocky core of a gas giant.
Cochran William D.
Endl Michael
McArthur Barbara E.
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