Mon. Not. R. Astron. Soc., 464, 3309-3314 (2017/January-3)
Zero age planetary orbit of gas giant planets revisited: reinforcement of the link with stellar metallicity.
PINOTTI R., BOECHAT-ROBERTY H.M. and PORTO DE MELLO G.F.
Abstract (from CDS):
In 2005, we suggested a relation between the optimal locus of gas giant planet formation, prior to migration, and the metallicity of the host star, based on the core accretion model, and radial profiles of dust surface density and gas temperature. At that time, less than 200 extrasolar planets were known, limiting the scope of our analysis. Here, we take into account the expanded statistics allowed by new discoveries, in order to check the validity of some premises. We compare predictions with the present available data and results for different stellar mass ranges. We find that the zero age planetary orbit (ZAPO) hypothesis continues to hold after an order of magnitude increase in discovered planets. In particular, the prediction that metal-poor stars harbour planets with average radii distinctively lower than metal-rich ones is still evident in the statistics, and cannot be explained by chaotic planetary formation mechanisms involving migration and gravitational interaction between planets. The ZAPO hypothesis predicts that in metal-poor stars the planets are formed near their host stars; as a consequence, they are more frequently engulfed by the stars during the migration process or stripped of their gaseous envelops. The depleted number of gas giant planets around metal-poor stars would then be the result of the synergy between low formation probability, as predicted by the core accretion model, and high destruction probability, for the ones that are formed.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
planets and satellites: formation - planets and satellites: gaseous planets - protoplanetary discs - stars: abundances - stars: abundances
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