Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars

Details Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542318b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #423.18; Bulletin of the American Astronomical Society, Vol. 42, p.329

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of 5 years of radial velocity measurements from the Lick Subgiant Planet Search program targeting a sample of 31 intermediate-mass stars (1.5 < M*/Msun < 1.9). The frequency of Jovian planets within 3 AU is 26%, which is significantly higher than the frequency for solar-mass stars. We perform a Monte Carlo analysis to compare the power-law relationships that characterize the mass and period distributions of planets around Sun-like stars to those around intermediate-mass stars. These distributions differ at the 4 sigma confidence level. Thus, the properties of planets around A stars are markedly different than those around Sun-like stars, suggesting that a small ( 50%) increase in stellar mass has a large influence on the formation and orbital evolution of planets.

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