title: The phase-dependent infrared brightness of the extrasolar planet upsilon Andromedae b.
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.
authors.affiliation: Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Harrington
authors.forename: Brad M
authors.initials: BM
authors.lastname: Hansen
authors.forename: Statia H
authors.initials: SH
authors.lastname: Luszcz
authors.forename: Sara
authors.initials: S
authors.lastname: Seager
authors.forename: Drake
authors.initials: D
authors.lastname: Deming
authors.forename: Kristen
authors.initials: K
authors.lastname: Menou
authors.forename: James Y-K
authors.initials: JY
authors.lastname: Cho
authors.forename: L Jeremy
authors.initials: LJ
authors.lastname: Richardson
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D016083:Planets