期刊
ASTRONOMY & ASTROPHYSICS
卷 452, 期 2, 页码 669-683出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20054364
关键词
methods : numerical; polarization; radiative transfer; stars : planetary systems
We present an efficient numerical method for integrating planetary radiation over a planetary disk, which is especially interesting for simulating signals of extrasolar planets. Our integration method is applicable to calculating the full flux vector of the disk-integrated planetary radiation, i.e. not only its observed flux ( irradiance), but also its state of polarization ( linear and circular). Including polarization is important for simulations of the light reflected by a planet, in particular, because this will generally be polarized. Our integration method is based on the expansion of the radiation field of a spherical, horizontally homogeneous planet into generalized spherical functions. With the expansion coefficients, the flux vector of the disk-integrated, reflected starlight can be obtained rapidly for arbitrary planetary phase angles. We describe the theory behind the disk-integration algorithm and results of accuracy tests. In addition, we give some illustrative examples of the application of the algorithm to extrasolar planets.
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