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We present {em Spitzer} secondary-eclipse observations of the hot Jupiter HAT-P-13 b in the 3.6 {micron} and 4.5 {micron} bands. HAT-P-13 b inhabits a two-planet system with a configuration that enables constraints on the planets second Love number, math{ksb{2}}, from precise eccentricity measurements, which in turn constrains models of the planets interior structure. We exploit the direct measurements of math{e cos omega} from our secondary-eclipse data and combine them with previously published radial velocity data to generate a refined model of the planets orbit and thus an improved estimate on the possible interval for math{ksb{2}}. We report eclipse phases of math{0.49154 pm 0.00080} and math{0.49711 pm 0.00083} and corresponding math{e cos omega} estimates of math{-0.0136 pm 0.0013} and math{-0.0048 pm 0.0013}. Under the assumptions of previous work, our estimate of math{ksb{2}} of 0.81 {pm} 0.10 is consistent with the lower extremes of possible core masses found by previous models, including models with no solid core. This anomalous result challenges both interior models and the dynamical assumptions that enable them, including the essential assumption of apsidal alignment. We also report eclipse depths of 0.081% {pm} 0.008% in the 3.6 {micron} channel and 0.088 % {pm} 0.028 % in the 4.5 {micron} channel. These photometric results are non-uniquely consistent with solar-abundance composition without any thermal inversion.
It is well-established that the magnitude of the incident stellar flux is the single most important factor in determining the day-night temperature gradients and atmospheric chemistries of short-period gas giant planets. However it is likely that oth
The transiting exoplanet WASP-18b was discovered in 2008 by the Wide Angle Search for Planets (WASP) project. The Spitzer Exoplanet Target of Opportunity Program observed secondary eclipses of WASP-18b using Spitzers Infrared Array Camera (IRAC) in t
Previous secondary eclipse observations of the hot Jupiter Qatar-1b in the Ks band suggest that it may have an unusually high day side temperature, indicative of minimal heat redistribution. There have also been indications that the orbit may be slig
We present Warm Spitzer/IRAC secondary eclipse time series photometry of three short-period transiting exoplanets, HAT-P-3b, HAT-P-4b and HAT-P-12b, in both the available 3.6 and 4.5 micron bands. HAT-P-3b and HAT-P-4b are Jupiter-mass, objects orbit
We report secondary eclipse photometry of the hot Jupiter HAT-P-32Ab, taken with Hale/WIRC in H and Ks bands and with Spitzer/IRAC at 3.6 and 4.5 micron. We carried out adaptive optics imaging of the planet host star HAT-P-32A and its companion HAT-P