Infrared Photometry of the Hot Earth Orbiting Gliese 876

Details Infrared Photometry of the Hot Earth Orbiting Gliese 876 Infrared Photometry of the Hot Earth Orbiting Gliese 876

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..258d&link_type=abstract

Spitzer Proposal ID #258

Computer Science

Scientific paper

Rivera et al. (2005) have recently reported Doppler detection of a ~7.5 Earth-mass planet orbiting the nearby M-dwarf Gliese 876 with a period of 1.97 days. We propose to detect the phase variation of the IR thermal emission of this planet, using IRAC at 8 and 4.5 microns. Because this system lies only 4.7 pc from Earth, the IR flux from this terrestial planet is likely to be comparable to the thermal fluxes from the hot Jupter planets already detected by Spitzer. Since the planet's rotation is likely to be synchronous with its orbit, the amplitude and relative phase of the thermal emission curve will yield significant information on the existence and nature of an atmosphere on this extrasolar Earth. Our error level will be a factor of 8 below the maximum expected signal, and even a null result will be of significant interest.

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