Journal
ASTRONOMY & ASTROPHYSICS
Volume 493, Issue 2, Pages 671-676Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20078951
Keywords
planetary systems; planetary systems: formation; stars: individual: GJ 436
Categories
Funding
- Fundacao para Ciencia e a Tecnologia (Portugal) [SFRH/BD/21502/2005]
- Swiss National Science Foundation
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The hot Neptune orbiting around GJ 436 is a unique example of an intermediate mass planet. Its close-in orbit suggests that the planet has undergone migration and its study is fundamental to understand planet formation and evolution. As it transits its parent star, it is the only Neptune-mass extrasolar planet of known mass and radius, being slightly larger and more massive than Neptune (M = 22.6 M(sic), R = 4.19 R(sic)). In this regime, several bulk compositions are possible: from an Earth-like core with a thick hydrogen envelope to a water-rich planet with a thin hydrogen envelope, and comprising a Neptune-like structure. We combine planet-structure modelling with an advanced planet-formation model to assess the likelihood of the different possible bulk compositions of GJ 436 b. We find that both an envelope-free water planet (Ocean planet) as well as a diminute version of a gaseous giant planet are excluded. Consisting of a rocky core with a thick hydrogen/helium envelope, a dry composition produces not only too small a radius but is also a very unlikely outcome of planet formation around such a low-mass star. We conclude that GJ 436 b is probably of much higher rock content than Neptune (more than 45% in mass), with a small H-He envelope (10-20% in mass). This is the expected outcome of the gathering of materials during the migration process in the inner disk, creating a population of which the hot Neptune is representative.
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