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Updated: Jul 19, 2026

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
The phase-dependent infrared brightness of the extrasolar planet upsilon Andromedae b
Joseph Harrington1, Brad M Hansen, Statia H Luszcz
1Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
Abstract:
The star upsilon Andromedae is orbited by three known planets, the innermost of which has an orbital period of 4.617 days and a mass at least 0.69 that of Jupiter. This planet is close enough to its host star that the radiation it absorbs overwhelms its internal heat losses. Here, we present the 24-micrometer light curve of this system, obtained with the Spitzer Space Telescope. It shows a variation in phase with the orbital motion of the innermost planet, demonstrating that such planets possess distinct hot substellar (day) and cold antistellar (night) faces.
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