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Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b

Author(s): Todorov, Kamen O; Deming, Drake; Knutson, Heather A; Burrows, Adam S; Fortney, Jonathan J; et al

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Abstract: 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 4.5μm bands. HAT-P-3b andHAT-P-4b are Jupiter-mass objects orbiting an early K and an early G dwarf star, respectively. For HAT-P-3b we find eclipse depths of 0.112%+0.015%−0.030%(3.6μm) and 0.094%+0.016%−0.009%(4.5μm). The HAT-P-4b values are 0.142%+0.014%−0.016%(3.6μm) and 0.122%+0.012%−0.014%(4.5μm). The two planets’ photometry is consistent with inefficient heat redistribution from their day to night sides (and low albedos), but it is inconclusive about possible temperature inversions in their atmospheres. HAT-P-12b is a Saturn-mass planet and is one of the coolest planets ever observed during secondary eclipse, along with the hot Neptune GJ 436b and the hot Saturn WASP-29b. We are able to place 3σupper limits on the secondary eclipse depth of HAT-P-12b in both wavelengths:<0.042% (3.6μm) and<0.085% (4.5μm). We discuss these results in the context of the Spitzer secondary eclipse measurements of GJ 436b and WASP-29b. It is possible that we do not detect the eclipses of HAT-P-12b due to high eccentricity, but find that weak planetary emission in these wavelengths is a more likely explanation. We place 3σupper limits on the |ecosω| quantity (where e is eccentricity and ωis the argument of periapsis) for HAT-P-3b (<0.0081) and HAT-P-4b (<0.0042), based on the secondary eclipse timings.
Publication Date: 20-Jun-2013
Electronic Publication Date: 30-May-2013
Citation: Todorov, Kamen O, Deming, Drake, Knutson, Heather A, Burrows, Adam, Fortney, Jonathan J, Lewis, Nikole K, Cowan, Nicolas B, Agol, Eric, Desert, Jean-Michel, Sada, Pedro V, Charbonneau, David, Laughlin, Gregory, Langton, Jonathan, Showman, Adam P. (2013). Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b. \apj, 770 (102 - 102. doi:10.1088/0004-637X/770/2/102
DOI: doi:10.1088/0004-637X/770/2/102
Type of Material: Journal Article
Journal/Proceeding Title: Astrophysical Journal
Version: Final published version. This is an open access article.

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