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21 September 2012 The study of magnetic activity and exoplanet magnetospheres using EChO VNIR-channel spectropolarimetry
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Abstract
The EChO satellite provides an opportunity to investigate the magnetic stellar activity and the nature of magnetic interactions of exoplanets with their host stars by using spectropolarimetry from space. These include auroral phenomena induced by the coupling on the exoplanet, induced flows between the planet and parent star, and a broad range of signatures of enhanced magneto-hydrodynamic interactions. A comprehensive view of the structure and evolution of exoplanetary atmospheres requires investigating the escape mechanisms of their constituent species, including the effect of a planetary magnetosphere. Given the distribution of masses and orbital parameters among the currently known gas giant exoplanets, the presence of a significant magnetic field could have some surprising consequences. In analogy with active dynamo-generated fields in close binary star systems, such as the RS CVn stars, a planetary field could link to that of the parent star, producing a strongly dissipative torque and magnetically and tidally locking the planet to its central star. Additionally, the study of stellar magnetism aids understanding of the coronal and chromospheric activity that affects the evolution of the planetary atmospheres.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Focardi, M. Pancrazzi, E. Pace, and S. N. Shore "The study of magnetic activity and exoplanet magnetospheres using EChO VNIR-channel spectropolarimetry", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844230 (21 September 2012); https://doi.org/10.1117/12.925237
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