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

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

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 radiu...

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Bibliographic Details
Main Authors: Gillon, M., Deming, Drake, Lovis, Christophe, Cubillos, P., Stevenson, K. B., Mayor, Michel, Pepe, F., Queloz, D., Segransan, D., Udry, S., Demory, Brice-Olivier, Valencia, Diana, Seager, Sara, Benneke, Bjoern, Harrington, Joseph, III
Other Authors: Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Format: Article
Language:en_US
Published: EDP Sciences 2014
Online Access:http://hdl.handle.net/1721.1/86109
https://orcid.org/0000-0002-6892-6948
Description
Summary: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.

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