Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
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In this article, the authors present evolutionary models for cool brown dwarfs and extra-solar giant planets and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets.Abstract:
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.read more
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References
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A Jupiter-Mass Companion to a Solar-Type Star
Michel Mayor,Didier Queloz +1 more
TL;DR: The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star's radial velocity as discussed by the authors, which would be well inside the orbit of Mercury in our Solar System.
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Gilles Chabrier,Gilles Chabrier,Isabelle Baraffe,Isabelle Baraffe,F. Allard,Peter H. Hauschildt +5 more
TL;DR: In this paper, the interior of the most massive brown dwarfs is shown to develop a conductive core after ~2 Gyr which slows down their cooling, and the authors suggest the possibility of a brown dwarf dearth in J, H, and K color-magnitude diagrams around this temperature.
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Detection of an Extrasolar Planet Atmosphere
TL;DR: In this paper, high-precision spectrophotometric observations of four planetary transits of HD 209458, in the region of the sodium resonance doublet at 589.3 nm, were reported.