Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-13
Astron.Astrophys. 420 (2004) 1153-1162
Astronomy and Astrophysics
Astrophysics
Keywords: Stars: planetary systems -- Planets: rings -- Extrasolar planet characterization. 10 pages, 16 figures. Published ve
Scientific paper
10.1051/0004-6361:20035720
It is expected that the next generation of high-contrast imaging instruments will deliver the first unresolved image of an extrasolar planet. The emitted thermal infrared light from the planet should show no phase effect assuming the planet is in thermal equilibrium. But the reflected visible light will vary versus the phase angle. Here, we study the photometric variation of the reflected light versus the orbital phase of a ringed extrasolar planet. We show that a ring around an extrasolar planet, both obviously unresolved, can be detected by its specific photometric signature. A simple quantitative model is discussed, taking into account the basic optical and geometrical properties of the ringed planet.
Arnold Luc
Schneider Jean
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