Theoretical Spectra and Atmospheres of Extrasolar Giant Planets

Details Theoretical Spectra and Atmospheres of Extrasolar Giant Planets Theoretical Spectra and Atmospheres of Extrasolar Giant Planets

2002-10-09

arxiv.org/abs/astro-ph/0210216v2

Astronomy and Astrophysics

Astrophysics

47 pages, plus 36 postscript figures; with minor revisions, accepted to the Astrophysical Journal, May 10, 2003 issue

Scientific paper

10.1086/374331

We present a comprehensive theory of the spectra and atmospheres of irradiated extrasolar giant planets. We explore the dependences on stellar type, orbital distance, cloud characteristics, planet mass, and surface gravity. Phase-averaged spectra for specific known extrasolar giant planets that span a wide range of the relevant parameters are calculated, plotted, and discussed. The connection between atmospheric composition and emergent spectrum is explored in detail. Furthermore, we calculate the effect of stellar insolation on brown dwarfs. We review a variety of representative observational techniques and programs for their potential for direct detection, in light of our theoretical expectations, and we calculate planet-to-star flux ratios as a function of wavelength. Our results suggest which spectral features are most diagnostic of giant planet atmospheres and reveal the best bands in which to image planets of whatever physical or orbital characteristics.

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