Detection of a transit of the super-Earth 55 Cancri e with warm Spitzer

Author(s)
Gillon, M.; Deming, Drake; Lovis, Christophe; Cubillos, P.; Harrington, Joseph; ... Show more
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Abstract
We report on the detection of a transit of the super-Earth 55 Cnc e with warm Spitzer in IRAC’s 4.5 μm band. Our MCMC analysis includes an extensive modeling of the systematic effects affecting warm Spitzer photometry, and yields a transit depth of 410 ± 63 ppm, which translates to a planetary radius of 2.08[+0.16 over -0.17]R[subscript ⊕] as measured in IRAC 4.5 μm channel. A planetary mass of 7.81[+0.58 over -0.53]M[subscript ⊕] is derived from an extensive set of radial-velocity data, yielding a mean planetary density of 4.78[+1.31 over -1.20] g cm[superscript -3]. Thanks to the brightness of its host star (V = 6, K = 4), 55 Cnc e is a unique target for the thorough characterization of a super-Earth orbiting around a solar-type star.
Date issued
2011-09
URI
http://hdl.handle.net/1721.1/86109
Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology. Department of Physics
Journal
Astronomy & Astrophysics
Publisher
EDP Sciences
Citation
Demory, B.-O., M. Gillon, D. Deming, D. Valencia, S. Seager, B. Benneke, C. Lovis, et al. “ Detection of a Transit of the Super-Earth 55 Cancri e with Warm  Spitzer .” A&A 533 (September 2011): A114. © ESO, 2011
Version: Final published version
ISSN
0004-6361
1432-0746
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