Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945

Details Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945 Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945

2003-02-14

arxiv.org/abs/astro-ph/0302293v1

Astron.Astrophys.402:701-712,2003

Astronomy and Astrophysics

Astrophysics

14 pages, Latex file, uses aa.cls, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030252

We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also present evolutionary models for irradiated planets, coupling for the first time irradiated atmosphere profiles and inner structures. We focus on HD 209458-like systems and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets. Irradiation effects, however, cannot alone explain the large observed radius of HD 209458b. Adopting assumptions which optimise irradiation effects and taking into account the extension of the outer atmospheric layers, we still find $\sim$ 20% discrepancy between observed and theoretical radii. An extra source of energy seems to be required to explain the observed value of the first transit planet.

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