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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 | Abstract: | 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. | Source: | arXiv, arxiv.0707.2261 | Services: | Forum | Review | PDF | Favorites |
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