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dc.contributor.authorKnutson, Heather A.
dc.contributor.authorShowman, Adam P.
dc.contributor.authorCowan, Nicolas B.
dc.contributor.authorLaughlin, Gregory
dc.contributor.authorBurrows, Adam
dc.contributor.authorDeming, Drake
dc.contributor.authorCrepp, Justin R.
dc.contributor.authorMighell, Kenneth J.
dc.contributor.authorAgol, Eric
dc.contributor.authorBakos, Gaspar A.
dc.contributor.authorCharbonneau, David
dc.contributor.authorDesert, Jean-Michel
dc.contributor.authorFischer, Debra A.
dc.contributor.authorFortney, Jonathan J.
dc.contributor.authorHartman, Joel D.
dc.contributor.authorHinkley, Sasha
dc.contributor.authorHoward, Andrew W.
dc.contributor.authorJohnson, John Asher
dc.contributor.authorKao, Melodie M.
dc.contributor.authorLangton, Jonathan
dc.contributor.authorMarcy, Geoffrey W.
dc.contributor.authorLewis, Nikole
dc.date.accessioned2015-02-05T20:13:34Z
dc.date.available2015-02-05T20:13:34Z
dc.date.issued2013-03
dc.date.submitted2012-10
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/1721.1/93877
dc.description.abstractWe present the first secondary eclipse and phase curve observations for the highly eccentric hot Jupiter HAT-P-2b in the 3.6, 4.5, 5.8, and 8.0 μm bands of the Spitzer Space Telescope. The 3.6 and 4.5 μm data sets span an entire orbital period of HAT-P-2b (P = 5.6334729 d), making them the longest continuous phase curve observations obtained to date and the first full-orbit observations of a planet with an eccentricity exceeding 0.2. We present an improved non-parametric method for removing the intrapixel sensitivity variations in Spitzer data at 3.6 and 4.5 μm that robustly maps position-dependent flux variations. We find that the peak in planetary flux occurs at 4.39 ± 0.28, 5.84 ± 0.39, and 4.68 ± 0.37 hr after periapse passage with corresponding maxima in the planet/star flux ratio of 0.1138% ± 0.0089%, 0.1162% ± 0.0080%, and 0.1888% ± 0.0072% in the 3.6, 4.5, and 8.0 μm bands, respectively. Our measured secondary eclipse depths of 0.0996% ± 0.0072%, 0.1031% ± 0.0061%, 0.071% [+0.029% over -0.013%], and 0.1392% ± 0.0095% in the 3.6, 4.5, 5.8, and 8.0 μm bands, respectively, indicate that the planet cools significantly from its peak temperature before we measure the dayside flux during secondary eclipse. We compare our measured secondary eclipse depths to the predictions from a one-dimensional radiative transfer model, which suggests the possible presence of a transient day side inversion in HAT-P-2b's atmosphere near periapse. We also derive improved estimates for the system parameters, including its mass, radius, and orbital ephemeris. Our simultaneous fit to the transit, secondary eclipse, and radial velocity data allows us to determine the eccentricity (e = 0.50910 ± 0.00048) and argument of periapse (ω = 188°.09 ± 0°.39) of HAT-P-2b's orbit with a greater precision than has been achieved for any other eccentric extrasolar planet. We also find evidence for a long-term linear trend in the radial velocity data. This trend suggests the presence of another substellar companion in the HAT-P-2 system, which could have caused HAT-P-2b to migrate inward to its present-day orbit via the Kozai mechanism.en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration. Jet Propulsion Laboratory (U.S.)en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration. Earth and Space Science Fellowship Program (NNX08AX02H)en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration. Origins Program (NNX08AF27G)en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration. Sagan Fellowship Program (California Institute of Technology)en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/0004-637x/766/2/95en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAmerican Astronomical Societyen_US
dc.titleORBITAL PHASE VARIATIONS OF THE ECCENTRIC GIANT PLANET HAT-P-2ben_US
dc.typeArticleen_US
dc.identifier.citationLewis, Nikole K., Heather A. Knutson, Adam P. Showman, Nicolas B. Cowan, Gregory Laughlin, Adam Burrows, Drake Deming, et al. “ORBITAL PHASE VARIATIONS OF THE ECCENTRIC GIANT PLANET HAT-P-2b.” The Astrophysical Journal 766, no. 2 (March 13, 2013): 95. © 2013 The American Astronomical Societyen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.mitauthorLewis, Nicoleen_US
dc.relation.journalAstrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsLewis, Nikole K.; Knutson, Heather A.; Showman, Adam P.; Cowan, Nicolas B.; Laughlin, Gregory; Burrows, Adam; Deming, Drake; Crepp, Justin R.; Mighell, Kenneth J.; Agol, Eric; Bakos, Gaspar A.; Charbonneau, David; Desert, Jean-Michel; Fischer, Debra A.; Fortney, Jonathan J.; Hartman, Joel D.; Hinkley, Sasha; Howard, Andrew W.; Johnson, John Asher; Kao, Melodie; Langton, Jonathan; Marcy, Geoffrey W.en_US
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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