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Title:
Exoplanet HAT-P-11b Secondary Transit Observations
Authors:
Barry, Richard; Deming, Drake; Bakos, Gaspar; Deming, L. Drake; Harrington, Joseph; Madhusudhan, Nikku; Noyes, Robert; Seager, Sarah
Publication:
Spitzer Proposal ID #60063
Publication Date:
04/2009
Origin:
SPITZER
Bibliographic Code:
2009sptz.prop60063B

Abstract

We propose to conduct secondary eclipse observations of exoplanet HAT-P-11b, recently discovered by proposal Co-Investigator G. Bakos and his colleagues. HAT-P-11b is the smallest transiting extrasolar planet yet found and one of only two known exo-Neptunes. We will observe the system at 3.6 microns for a period of 22 hours centered on the anticipated secondary eclipse time, to detect the eclipse and determine its phase. Once the secondary eclipse is located, we will make a more focused series of observations in both the 3.6 and 4.5 micron bands to fully characterize it. HAT-P-11b has a period of 4.8878 days, radius of 0.422 RJ, mass of 0.081 MJ and semi-major axis 0.053 AU. Measurements of the secondary eclipse will clarify two key issues; 1) the planetary brightness temperature and the nature of its atmosphere, and 2) the eccentricity of its orbit, with implications for its dynamical evolution. A precise determination of the orbit phase for the secondary eclipse will also be of great utility for Kepler observations of this system at visible wavelengths.
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