Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0905j&link_type=abstract
American Astronomical Society Meeting 210, #09.05; Bulletin of the American Astronomical Society, Vol. 39, p.106
Astronomy and Astrophysics
Astronomy
Scientific paper
Very little is known about the occurrence rate and orbital properties of planets around A type stars, corresponding to stellar masses ranging from 1.5 Msun to 2.5 Msun. The apparent dearth of planets around massive stars is due to a strong selection bias against early-type, main-sequence stars in Doppler-based planet searches. A-type stars have sparse, rotationally broadened spectral features, which limits the radial velocity precision attainable from their spectra. One method to circumvent the difficulties inherent to massive dwarfs is to instead observe these stars after they have evolved onto the subgiant branch of the H-R diagram. We show how the cooler atmospheres and slower rotational velocities of subgiants make them ideal proxies for A stars in Doppler-based planet searches. We also present the early results from our planet search, including several exoplanets orbiting stars with masses greater than 1.6 Msun.
Fischer Debra Ann
Johnson John A.
Marcy Geo? W.
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