A Theory for the Radius of the Transiting Giant Planet HD 209458b

Details A Theory for the Radius of the Transiting Giant Planet HD 209458b A Theory for the Radius of the Transiting Giant Planet HD 209458b

2003-05-15

arxiv.org/abs/astro-ph/0305277v1

Astrophys.J. 594 (2003) 545-551

Astronomy and Astrophysics

Astrophysics

6 pages in emulateapj format, plus 2 figures (one color), accepted to the Astrophysical Journal

Scientific paper

10.1086/376897

Using a full frequency-dependent atmosphere code that can incorporate irradiation by a central primary star, we calculate self-consistent boundary conditions for the evolution of the radius of the transiting planet HD 209458b. Using a well-tested extrasolar giant planet evolutionary code, we then calculate the behavior of this planet's radius with age. The measured radius is in fact a transit radius that resides high in HD 209458b's inflated atmosphere. Using our derived atmospheric and interior structures, we find that irradiation plus the proper interpretation of the transit radius can yield a theoretical radius that is within the measured error bars. We conclude that if HD 209458b's true transit radius is at the lower end of the measured range, an extra source of core heating power is not necessary to explain the transit observations.

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