Authors

B. O. Demory; M. Gillon; D. Deming; D. Valencia; S. Seager; B. Benneke; C. Lovis; P. Cubillos; J. Harrington; K. B. Stevenson; M. Mayor; F. Pepe; D. Queloz; D. Segransan;S. Udry

Comments

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Abbreviated Journal Title

Astron. Astrophys.

Keywords

binaries: eclipsing; planetary systems; stars: individual: 55 Cnc; techniques: photometric; EXTRA-SOLAR PLANETS; NEPTUNE-MASS PLANET; GJ 1214B; EFFECTIVE; TEMPERATURES; SPACE-TELESCOPE; MAIN-SEQUENCE; SHORT-PERIOD; SEARCH; STAR; SYSTEM; Astronomy & Astrophysics

Abstract

We report on the detection of a transit of the super-Earth 55 Cnc e with warm Spitzer in IRAC's 4.5 mu m 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(-0.17)(+0.16) R-circle plus as measured in IRAC 4.5 mu m channel. A planetary mass of 7.81(-0.53)(+0.58) M-circle plus is derived from an extensive set of radial-velocity data, yielding a mean planetary density of 4.78(-1.20)(+1.31) 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.

Journal Title

Astronomy & Astrophysics

Volume

533

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000295168100114

ISSN

0004-6361

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