Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b

Gillon, M.; Demory, B.-O.; Barman, T.; Bonfils, X.; Mazeh, T.; Pont, F.; Udry, S.; Mayor, M.; Queloz, D. (2007). Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b. Astronomy and astrophysics, 471(3), L51-L54. EDP Sciences 10.1051/0004-6361:20078283

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We present Spitzer Space Telescope infrared photometry of a primary transit of the hot Neptune GJ 436b. The observations were obtained using the 8 μm band of the InfraRed Array Camera (IRAC). The high accuracy of the transit data and the weak limb-darkening in the 8 μm IRAC band allow us to derive (assuming M = 0.44 ± 0.04 M⊙ for the primary) a precise value for the planetary radius (4.19+0.21-0.16 R⊙), the stellar radius (0.463+0.022-0.017 R⊙), the orbital inclination (85.90+0.19⁰-0.18⁰) and transit timing (2454280.78186+0.00015-0.00008 HJD). Assuming current planet models, an internal structure similar to that of Neptune with a small H/He envelope is necessary to account for the measured radius of GJ 436b.

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