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Article Dans Une Revue Infrared Physics and Technology Année : 2010

Brightness temperature of synchronic exoplanets measured by infrared photometry from the ground: Method and perspective

Résumé

We explore a method to measure the temperature at the surface of ”hot Jupiter” type exoplanets by relative photometry in the infrared at around 10 μm in N spectral band. The method is described and validated by numerical simulations. Thermal radiation from an exoplanet and its parent star are analysed. Geometrical configurations of extra-solar planet rotating synchronously around parent star are explored for a feasibility study of the detection. A Jupiter size planet in orbit at 0.025 astronomical unit from Sun-like parent star should have a harmonic signature of up to 0.2 % in amplitude with a period of the planets orbital duration. Such a signature is difficult to detect when making absolute measurements, but by differential methods of analyses, and using a radiative transfer model to take into account background sky contribution of the Earth's atmosphere, this relative accuracy can be reached. Some results of simulations of observation are also presented.

Dates et versions

hal-00436751 , version 1 (27-11-2009)

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Citer

Alain Sarkissian. Brightness temperature of synchronic exoplanets measured by infrared photometry from the ground: Method and perspective. Infrared Physics and Technology, 2010, 53 (3), pp.186-192. ⟨10.1016/j.infrared.2009.11.005⟩. ⟨hal-00436751⟩
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