Letter to the editor (Scientific journals)
Detection of Thermal Emission from a Super-Earth
Demory, Brice*-Olivier; Gillon, Michaël; Seager, Sara et al.
2012In Astrophysical Journal. Letters, 751 (2), p. 28
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We report on the detection of infrared light from the super-Earth 55 Cnc e, based on four occultations obtained with Warm Spitzer at 4.5 microns. Our data analysis consists of a two-part process. In a first step, we perform individual analyses of each dataset and compare several baseline models to optimally account for the systematics affecting each lightcurve. We apply independent photometric correction techniques, including polynomial detrending and pixel-mapping, that yield consistent results at the 1-sigma level. In a second step, we perform a global MCMC analysis including all four datasets, that yields an occultation depth of 131+-28ppm, translating to a brightness temperature of 2360+-300 K in the IRAC-4.5 micron channel. This occultation depth suggests a low Bond albedo coupled to an inefficient heat transport from the planetary dayside to the nightside, or else possibly that the 4.5-micron observations probe atmospheric layers that are hotter than the maximum equilibrium temperature (i.e., a thermal inversion layer or a deep hot layer). The measured occultation phase and duration are consistent with a circular orbit and improves the 3-sigma upper limit on 55 Cnc e's orbital eccentricity from 0.25 to 0.06.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Demory, Brice*-Olivier
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Seager, Sara
Benneke, Bjoern
Deming, Drake
Jackson, Brian
Language :
English
Title :
Detection of Thermal Emission from a Super-Earth
Publication date :
01 June 2012
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
751
Issue :
2
Pages :
L28
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 May 2012

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