Uses of Linear Polarization as a Probe of Extrasolar Planet Atmospheres

Details Uses of Linear Polarization as a Probe of Extrasolar Planet Atmospheres Uses of Linear Polarization as a Probe of Extrasolar Planet Atmospheres

2003-05-22

arxiv.org/abs/astro-ph/0305436v1

Scientific Frontiers in Research on Extrasolar Planets, eds. D. Deming and S. Seager, ASP Conf. Ser. 2003, 294, 529-534

Astronomy and Astrophysics

Astrophysics

6 pages, conf. proceedings for Scientific Frontiers in Research on Extrasolar Planets eds. D. Deming and S. Seager

Scientific paper

We point out some advantages of making observations of extrasolar planets in linearly polarized (LP) light. Older cool stars have quite low levels (~ 10^-4 to 10^-5) of fractional LP, while extrasolar planets can have relatively high fractional LP (~0.1). Observations in LP light can therefore significantly enhance contrast between the planet and its parent star. Data on LP as a function of planetary orbital phase can be used to diagnose the properties (e.g., composition, size, and shape) of the scatterers in the planetary atmosphere. We discuss the feasibility of LP observations of extrasolar planets.

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