Detection of a transit of the super-Earth 55 Cnc e with Warm Spitzer

B.-O. Demory , M. Gillon , D. Deming , D. Valencia , S. Seager , B. Benneke , C. Lovis , P. Cubillos

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J. Harrington K. B. Stevenson M. Mayor F. Pepe D. Queloz D. Segransan S. Udry

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classification 🌌 astro-ph.EP

keywords planetaryspitzersuper-earthtransitwarmdetectionearthextensive

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We report on the detection of a transit of the super-Earth 55 Cnc e with warm Spitzer in IRAC's 4.5-micron 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 R_Earth as measured in IRAC 4.5-micron channel. A planetary mass of 7.81 +- 0.58 M_Earth is derived from an extensive set of radial-velocity data, yielding a mean planetary density of 4.8 +- 1.3 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.

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Detection of a transit of the super-Earth 55 Cnc e with Warm Spitzer

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