Thermal Emission from the Super-Earth Orbiting GJ 876

Details Thermal Emission from the Super-Earth Orbiting GJ 876 Thermal Emission from the Super-Earth Orbiting GJ 876

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50440d&link_type=abstract

Spitzer Proposal ID #50440

Physics

Scientific paper

GJ 876d is a 7.5 Earth mass non-transiting super-Earth orbiting at 0.025 AU from its M4V host star. This system is a very near neighbor of the Sun, at only 5 pc distant, so the thermal flux from the planet will be maximized. We propose to detect the orbital phase variation of 8 micron thermal emission from the super-Earth mass planet GJ 876d during ~ 70% of the planet's 1.97 day period orbit. Our observations will rely on high precision photometry at 8 microns, focusing exclusively on this crucial capability that will disappear with the depletion of Spitzer's cryogen. We will detect this planet if it is a bare rock, or has only a thin atmosphere, for all plausible sizes and albedos. We will use a novel technical strategy that will 'pre-flash' the IRAC detector to eliminate the time dependence of detector response.

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