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

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

2007-07-16

arxiv.org/abs/0707.2261v4

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A on 21/07/2007; 5 pages, 3 figures

Scientific paper

10.1051/0004-6361:20078283

We 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.

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