Hyper Illumination of Exoplanets: Analytical and Numerical Approaches

Carter, Jennifer L.Susquehanna Univ, Dept Phys, 514 Univ Ave, Selinsgrove, PA 17870 USA. (författare)

Hyper Illumination of Exoplanets : Analytical and Numerical Approaches

This work describes the illumination of exoplanets whose orbits are close enough to their host star that the finite angular size of their host star causes hyper illumination, in which more than 50% of the planet receives light. Such exoplanets include the hot Jupiters KELT-9 b (64.5% illuminated) and Kepler-91 b (69.6% illuminated). We describe the geometry of three primary illumination zones: the fully illuminated zone, penumbral zone, and unilluminated zone. The integrals required to determine the incident radiation as a function of position from the substellar point on the exoplanet are explained and derived, and the analytical solution is presented within the fully illuminated zone. We find that the illumination predicted by our model is greater at the substellar point than the typical plane-parallel ray model used would suggest. In addition, it is greater within the region of the penumbral zone extending into the antistellar side of the exoplanet. Finally, we compare our model to that used in starry, an open-source software package used to create albedo maps. It appears that starry may be overestimating the illumination of closely orbiting exoplanets because the foreshortening of the area element of the host star is not included in its calculation.

Perera, Risinie D.SUNY Albany, Dept Phys, 1400 Washington Ave, Albany, NY 12222 USA. (författare)
Way, Michael J.Uppsala universitet,Teoretisk astrofysik,Goddard Inst Space Studies, NASA, 2880 Broadway, New York, NY 10025 USA(Swepub:uu)micwa958 (författare)
Susquehanna Univ, Dept Phys, 514 Univ Ave, Selinsgrove, PA 17870 USA.SUNY Albany, Dept Phys, 1400 Washington Ave, Albany, NY 12222 USA. (creator_code:org_t)

Ingår i:Astronomical Journal: American Astronomical Society167:50004-62561538-3881

Av författaren/redakt...: Carter, Jennifer ...; Perera, Risinie ...; Way, Michael J.

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