Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30498d&link_type=abstract
Spitzer Proposal ID #30498
Computer Science
Scientific paper
We propose to characterize super-Earth-mass planets around nearby - and infrared bright - low-mass stars. We define super Earths to be planets between 5 and 30 Earth masses (and to include Neptune-mass planets). It may seem counter-intuitive that super Earths can be studied with Spitzer. However, the small size of M-dwarfs and the IR brightness of nearby M-dwarfs compensates for the small planetary radius of low-mass planets. We propose two related components in this program: (1) A search for infrared photometric orbital variation of the 7.5 Earth mass planet Gliese 876d in IRAC 4.5 and 8 micron bands. This will allow us to identify the presence or absence of a thick atmosphere. (2) Target of Opportunity observations of primary eclipse (transit) and secondary eclipse(s) of any hot super Earths to be discovered transiting M-dwarf stars. The primary eclipse (at IRAC 8 micron band) will allow a planet radius to be determined to 10% accuracy, enough to infer the planet's bulk composition (e.g., substantial gas envelope, liquid ocean interior, predominantly rocky or massive iron core, etc.). The secondary eclipse observations (in all four IRAC bands) will allow investigation of atmospheric escape, and planetary atmosphere composition and temperature.
Deming Drake
Seager Sara
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