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26 April 2024 |
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Characterization of the hot Neptune GJ 436b with Spitzer and ground-based observations | | B.-O. Demory
; M. Gillon
; T. Barman
; X. Bonfils
; M. Mayor
; T. Mazeh
; F. Pont
; D. Queloz
; S. Udry
; F. Bouchy
; X. Delfosse
; T. Forveille
; F. Mallmann
; F. Pepe
; C. Perrier
; | | Date: |
25 Jul 2007 | | Abstract: | We present Spitzer Space Telescope infrared photometry of a secondary eclipse
of the hot Neptune GJ 436b. The observations were obtained using the 8-micron
band of the InfraRed Array Camera (IRAC). The data spanning the predicted time
of secondary eclipse show a clear flux decrement with the expected shape and
duration. The observed eclipse depth of slightly less than 0.5 mmag allows us
to estimate a blackbody brightness temperature of Tb = 709 +-17 K at 8 microns.
We compare this infrared flux measurement to a model of the planetary thermal
emission, and show that this model reproduces properly the observed flux
decrement. The timing of the secondary eclipse confirms the non-zero orbital
eccentricity of the planet, while also increasing its precision (e = 0.14 +-
0.01). Using additional new spectroscopic and photometric observations allows
us to estimate the rotational period of the star and to assess to an high
extent the dynamics of the system and the potential presence of another planet. | | Source: | arXiv, 0707.3809 | | Services: | Forum | Review | PDF | Favorites | |
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