期刊
ASTRONOMY & ASTROPHYSICS
卷 551, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220574
关键词
stars: fundamental parameters; stars: late-type; stars: low-mass; stars: atmospheres; planetary systems
资金
- European Research Council/European Community under the FP7 through Starting Grant [239953]
- Programme National de Planetologie (PNP) of CNRS/INSU, France
- Fundacao para a Ciencia e a Tecnologia (FCT)
- FCT/MCTES (Portugal)
- POPH/FSE (EC)
- FCT [SFRH/BD/60688/2009]
- National Aeronautics and Space Administration
- National Science Foundation
- [PTDC/CTE-AST/098528/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/60688/2009, PTDC/CTE-AST/098528/2008] Funding Source: FCT
Aims. The aim of this work is the study of the planet-metallicity and the planet-stellar mass correlations for M dwarfs from the HARPS GTO M dwarf subsample. Methods. We use a new method that takes advantage of the HARPS high-resolution spectra to increase the precision of metallicity, using previous photometric calibrations of [Fe/H] and effective temperature as starting values. Results. In this work we use our new calibration (rms = 0.08 dex) to study the planet-metallicity relation of our sample. The well-known correlation for giant planet FGKM hosts with metallicity is present. Regarding Neptunians and smaller hosts no correlation is found but there is a hint that an anti-correlation with [Fe/H] may exist. We combined our sample with the California Planet Survey late-K and M-type dwarf sample to increase our statistics but found no new trends. We fitted a power law to the frequency histogram of the Jovian hosts for our sample and for the combined sample, f(P) = C10(alpha[Fe/H]), using two different approaches: a direct bin fitting and a Bayesian fitting procedure. We obtained a value for C between 0.02 and 0.04 and for alpha between 1.26 and 2.94. Regarding stellar mass, an hypothetical correlation with planets was discovered, but was found to be the result of a detection bias.
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