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19 April 2024
 
  » arxiv » arxiv.0707.2261

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Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b
M. Gillon ; B.-O. Demory ; T. Barman ; X. Bonfils ; T. Mazeh ; F. Pont ; S. Udry ; M. Mayor ; D. Queloz ;
Date 17 Jul 2007
AbstractWe present Spitzer Space Telescope infrared photometry of a primary transit of the hot Neptune GJ 436b. The observations were obtained using the 8 microns band of the InfraRed Array Camera (IRAC). The high accuracy of the transit data and the weak limb-darkening in the 8 microns IRAC band allow us to derive (assuming M = 0.44 +- 0.04 Msun for the primary) a precise value for the planetary radius (4.19 +0.21-0.16 Rearth), the stellar radius (0.463 +0.022-0.017 Rsun), the orbital inclination (85.90 +0.19-0.18 degrees) 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.
Source arXiv, arxiv.0707.2261
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