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25 April 2024 |
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Reflected Light Curves, Spherical and Bond Albedos of Jupiter- and Saturn-like Exoplanets | | Ulyana Dyudina
; Xi Zhang
; Liming Li
; Pushkar Kopparla
; Yuk L. Yung
; Andrew P. Ingersoll
; Luke Dones
; | | Date: |
10 Nov 2015 | | Abstract: | We estimate how the light curve and total stellar heating of a planet depend
on forward and backward scattering clouds. To do that, we construct light
curves for Jupiter- and Saturn-like planet based on observations. We fit
analytical functions to the reflected brightness of Jupiter’s and Saturn’s
surface versus planet’s phase. We use Pioneer and Cassini spacecraft images to
estimate these functions. These observations cover broad bands at 0.59-0.72
microns and 0.39-0.5 microns, and narrow bands at 0.938 microns (atmospheric
window), 0.889 microns (CH4 absorption band), and 0.24-0.28 microns. We
simulate the images of the planets at different phases with ray-tracing model
of a planet by Dyudina et al. (2005). The full-disk luminosity of these
simulated images changes with planet’s phase producing the full-orbit light
curves. We also derive total planet’s reflection integrated in all directions
(spherical albedos) for Jupiter, Saturn, and for planets with Lambertian and
Rayleigh-scattering atmosphere. For Jupiter, we tune the model to fit the
observed full-disk brightness at several phase angles. Jupiter-like atmosphere
can produce light curves that are a factor of two fainter at half-phase than
the Lambertian planet, given the same geometric albedo at transit. The
spherical albedo (and likely the wavelengh-integrated Bond albedo) is lower
than for a Lambertian planet. Corresponding absorption of the stellar light and
the planet’s heating rate would be higher than for a grey Lambertian planet.
Lambertian assumption can overestimate spherical albedo by up to a factor of ~
1.5. | | Source: | arXiv, 1511.4415 | | Services: | Forum | Review | PDF | Favorites | |
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