3.6 and 4.5 μm PHASE CURVES of the HIGHLY IRRADIATED ECCENTRIC HOT JUPITER WASP-14b

Ian Wong, Heather A. Knutson, Nikole K. Lewis, Tiffany Kataria, Adam Burrows, Jonathan J. Fortney, Joel Schwartz, Eric Agol, Nicolas B. Cowan, Drake Deming, Jean Michel Désert, Benjamin J. Fulton, Andrew W. Howard, Jonathan Langton, Gregory Laughlin, Adam Showman, Kamen Todorov

Research output: Contribution to journalArticle

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Abstract

We present full-orbit phase curve observations of the eccentric (e ∼ 0.08) transiting hot Jupiter WASP-14b obtained in the 3.6 and 4.5 μm bands using the Spitzer Space Telescope. We use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise. Our measured secondary eclipse depths of 0.1882% ± 0.0048% and 0.2247% ± 0.0086% at 3.6 and 4.5 μm, respectively, are both consistent with a blackbody temperature of 2402 ± 35 K. We place a 2σ upper limit on the nightside flux at 3.6 μm and find it to be 9% ± 1% of the dayside flux, corresponding to a brightness temperature of 1079 K. At 4.5 μm, the minimum planet flux is 30% ± 5% of the maximum flux, corresponding to a brightness temperature of 1380 ± 65 K. We compare our measured phase curves to the predictions of one-dimensional radiative transfer and three-dimensional general circulation models. We find that WASP-14b's measured dayside emission is consistent with a model atmosphere with equilibrium chemistry and a moderate temperature inversion. These same models tend to overpredict the nightside emission at 3.6 μm, while underpredicting the nightside emission at 4.5 μm. We propose that this discrepancy might be explained by an enhanced global C/O ratio. In addition, we find that the phase curves of WASP-14b (7.8 MJup) are consistent with a much lower albedo than those of other Jovian mass planets with thermal phase curve measurements, suggesting that it may be emitting detectable heat from the deep atmosphere or interior processes.

Original languageEnglish (US)
Article number122
JournalAstrophysical Journal
Volume811
Issue number2
DOIs
StatePublished - Oct 1 2015

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eccentrics
wasp
Jupiter (planet)
Jupiter
brightness temperature
curves
planet
planets
temperature inversion
atmosphere
temperature inversions
atmospheres
Space Infrared Telescope Facility
radiative transfer
albedo
general circulation model
eclipses
decoupling
chemistry
prediction

Keywords

  • binaries: eclipsing
  • planetary systems
  • stars: individual (WASP-14)
  • techniques: photometric

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Wong, I., Knutson, H. A., Lewis, N. K., Kataria, T., Burrows, A., Fortney, J. J., ... Todorov, K. (2015). 3.6 and 4.5 μm PHASE CURVES of the HIGHLY IRRADIATED ECCENTRIC HOT JUPITER WASP-14b. Astrophysical Journal, 811(2), [122]. https://doi.org/10.1088/0004-637X/811/2/122

3.6 and 4.5 μm PHASE CURVES of the HIGHLY IRRADIATED ECCENTRIC HOT JUPITER WASP-14b. / Wong, Ian; Knutson, Heather A.; Lewis, Nikole K.; Kataria, Tiffany; Burrows, Adam; Fortney, Jonathan J.; Schwartz, Joel; Agol, Eric; Cowan, Nicolas B.; Deming, Drake; Désert, Jean Michel; Fulton, Benjamin J.; Howard, Andrew W.; Langton, Jonathan; Laughlin, Gregory; Showman, Adam; Todorov, Kamen.

In: Astrophysical Journal, Vol. 811, No. 2, 122, 01.10.2015.

Research output: Contribution to journalArticle

Wong, I, Knutson, HA, Lewis, NK, Kataria, T, Burrows, A, Fortney, JJ, Schwartz, J, Agol, E, Cowan, NB, Deming, D, Désert, JM, Fulton, BJ, Howard, AW, Langton, J, Laughlin, G, Showman, A & Todorov, K 2015, '3.6 and 4.5 μm PHASE CURVES of the HIGHLY IRRADIATED ECCENTRIC HOT JUPITER WASP-14b', Astrophysical Journal, vol. 811, no. 2, 122. https://doi.org/10.1088/0004-637X/811/2/122
Wong, Ian ; Knutson, Heather A. ; Lewis, Nikole K. ; Kataria, Tiffany ; Burrows, Adam ; Fortney, Jonathan J. ; Schwartz, Joel ; Agol, Eric ; Cowan, Nicolas B. ; Deming, Drake ; Désert, Jean Michel ; Fulton, Benjamin J. ; Howard, Andrew W. ; Langton, Jonathan ; Laughlin, Gregory ; Showman, Adam ; Todorov, Kamen. / 3.6 and 4.5 μm PHASE CURVES of the HIGHLY IRRADIATED ECCENTRIC HOT JUPITER WASP-14b. In: Astrophysical Journal. 2015 ; Vol. 811, No. 2.
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abstract = "We present full-orbit phase curve observations of the eccentric (e ∼ 0.08) transiting hot Jupiter WASP-14b obtained in the 3.6 and 4.5 μm bands using the Spitzer Space Telescope. We use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise. Our measured secondary eclipse depths of 0.1882{\%} ± 0.0048{\%} and 0.2247{\%} ± 0.0086{\%} at 3.6 and 4.5 μm, respectively, are both consistent with a blackbody temperature of 2402 ± 35 K. We place a 2σ upper limit on the nightside flux at 3.6 μm and find it to be 9{\%} ± 1{\%} of the dayside flux, corresponding to a brightness temperature of 1079 K. At 4.5 μm, the minimum planet flux is 30{\%} ± 5{\%} of the maximum flux, corresponding to a brightness temperature of 1380 ± 65 K. We compare our measured phase curves to the predictions of one-dimensional radiative transfer and three-dimensional general circulation models. We find that WASP-14b's measured dayside emission is consistent with a model atmosphere with equilibrium chemistry and a moderate temperature inversion. These same models tend to overpredict the nightside emission at 3.6 μm, while underpredicting the nightside emission at 4.5 μm. We propose that this discrepancy might be explained by an enhanced global C/O ratio. In addition, we find that the phase curves of WASP-14b (7.8 MJup) are consistent with a much lower albedo than those of other Jovian mass planets with thermal phase curve measurements, suggesting that it may be emitting detectable heat from the deep atmosphere or interior processes.",
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AU - Wong, Ian

AU - Knutson, Heather A.

AU - Lewis, Nikole K.

AU - Kataria, Tiffany

AU - Burrows, Adam

AU - Fortney, Jonathan J.

AU - Schwartz, Joel

AU - Agol, Eric

AU - Cowan, Nicolas B.

AU - Deming, Drake

AU - Désert, Jean Michel

AU - Fulton, Benjamin J.

AU - Howard, Andrew W.

AU - Langton, Jonathan

AU - Laughlin, Gregory

AU - Showman, Adam

AU - Todorov, Kamen

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