Volume 533, September 2011
|Number of page(s)||7|
|Section||Planets and planetary systems|
|Published online||12 September 2011|
Detection of a transit of the super-Earth 55 Cancri e with warm Spitzer⋆
Department of Earth, Atmospheric and Planetary Sciences,
Department of Physics, Massachusetts Institute of Technology,
77 Massachusetts Ave.,
2 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Bat. B5C, 4000 Liège, Belgium
3 Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
4 Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
5 Planetary Science Group, Department of Physics, University of Central Florida, Orlando, FL 32816-2385, USA
Accepted: 31 July 2011
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 as measured in IRAC 4.5 μm channel. A planetary mass of is derived from an extensive set of radial-velocity data, yielding a mean planetary density of g cm-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.
Key words: binaries: eclipsing / planetary systems / stars: individual: 55 Cnc / techniques: photometric
The photometric time series used in this work are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/533/A114
© ESO, 2011
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