Radius and Structure models for the First Super-Earth Planet

Abstract

With improving methods and surveys, the young field of extrasolar planets has recently expanded into a qualitatively new domain - terrestrial (mostly rocky) planets. The first such planets were discovered during the past year, judging by their measured masses of less than 10 Earth-masses ($M_{\oplus }$) or Super-Earths. They are introducing a novel physical regime that has not been explored before as such planets do not exist in our Solar System. Their composition can be either completely terrestrial or harbour an extensive ocean (water and ices) above a rocky core. We model the structure and properties of the first Super-Earth (mass $\sim$ 7.5 $M_{\oplus }$) discovered in 2005, illustrating the possibilities in composition and providing radius evaluations in view of future detection of similar planets by transits. We find that a threshold in radius exists for which larger values indicate that a Super-Earth most certainly has an extensive water content. In the case of GJ876d this threshold is at about 12000 km. Our results show that unique characterization of the bulk composition of Super-Earths will be possible in future transit studies.

22 pages, 3 tables, 5 figures; Article will appear in ApJ Jan 2007 issue

References in corpus (10)

• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• Internal Structure of Massive Terrestrial Planets
• A ~ 7.5 Earth-Mass Planet Orbiting the Nearby Star, GJ 876
• An extrasolar planetary system with three Neptune-mass planets
• A New Family of Planets ? "Ocean Planets"
• A Planetary Companion to the Nearby M4 Dwarf, Gliese 876
• On the Snow Line in Dusty Protoplanetary Disks
• An Upper Limit on the Albedo of HD 209458b: Direct Imaging Photometry with the MOST Satellite
• Origin and Ubiquity of Short-Period Earth-like Planets: Evidence for the Sequential-Accretion Theory of Planet Formation
• The Transit Light Curve Project. IV. Five Transits of the Exoplanet OGLE-TR-10b

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