Warm spitzer and palomar near-ir secondary eclipse photometry of two hot jupiters

Wasp-48b and hat-p-23b

Joseph G. O'Rourke, Heather A. Knutson, Ming Zhao, Jonathan J. Fortney, Adam Burrows, Eric Agol, Drake Deming, Jean Michel Désert, Andrew W. Howard, Nikole K. Lewis, Adam Showman, Kamen O. Todorov

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We report secondary eclipse photometry of two hot Jupiters, WASP-48b and HAT-P-23b, at 3.6 and 4.5 μm taken with the InfraRed Array Camera aboard the Spitzer Space Telescope during the warm Spitzer mission and in the H and K S bands with the Wide Field IR Camera at the Palomar 200 inch Hale Telescope. WASP-48b and HAT-P-23b are Jupiter-mass and twice Jupiter-mass objects orbiting an old, slightly evolved F star and an early G dwarf star, respectively. In the H, KS , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.047% ± 0.016%, 0.109% ± 0.027%, 0.176% ± 0.013%, and 0.214% ± 0.020% for WASP-48b. In the KS , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.234% ± 0.046%, 0.248% ± 0.019%, and 0.309% ± 0.026% for HAT-P-23b. For WASP-48b and HAT-P-23b, respectively, we measure delays of 2.6 ± 3.9 minutes and 4.0 ± 2.4 minutes relative to the predicted times of secondary eclipse for circular orbits, placing 2σ upper limits on |ecos ω| of 0.0053 and 0.0080, both of which are consistent with circular orbits. The dayside emission spectra of these planets are well-described by blackbodies with effective temperatures of 2158 ± 100 K (WASP-48b) and 2154 ± 90 K (HAT-P-23b), corresponding to moderate recirculation in the zero albedo case. Our measured eclipse depths are also consistent with one-dimensional radiative transfer models featuring varying degrees of recirculation and weak thermal inversions or no inversions at all. We discuss how the absence of strong temperature inversions on these planets may be related to the activity levels and metallicities of their host stars.

Original languageEnglish (US)
Article number109
JournalAstrophysical Journal
Volume781
Issue number2
DOIs
StatePublished - Feb 1 2014

Fingerprint

eclipses
wasp
Jupiter (planet)
Jupiter
photometry
planet
circular orbits
temperature inversion
planets
cameras
radiative transfer
albedo
G stars
inversions
F stars
temperature inversions
dwarf stars
Space Infrared Telescope Facility
S band
metallicity

Keywords

  • planetary systems
  • stars: individual (WASP-48, HAT-P-23)
  • techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

O'Rourke, J. G., Knutson, H. A., Zhao, M., Fortney, J. J., Burrows, A., Agol, E., ... Todorov, K. O. (2014). Warm spitzer and palomar near-ir secondary eclipse photometry of two hot jupiters: Wasp-48b and hat-p-23b. Astrophysical Journal, 781(2), [109]. https://doi.org/10.1088/0004-637X/781/2/109

Warm spitzer and palomar near-ir secondary eclipse photometry of two hot jupiters : Wasp-48b and hat-p-23b. / O'Rourke, Joseph G.; Knutson, Heather A.; Zhao, Ming; Fortney, Jonathan J.; Burrows, Adam; Agol, Eric; Deming, Drake; Désert, Jean Michel; Howard, Andrew W.; Lewis, Nikole K.; Showman, Adam; Todorov, Kamen O.

In: Astrophysical Journal, Vol. 781, No. 2, 109, 01.02.2014.

Research output: Contribution to journalArticle

O'Rourke, JG, Knutson, HA, Zhao, M, Fortney, JJ, Burrows, A, Agol, E, Deming, D, Désert, JM, Howard, AW, Lewis, NK, Showman, A & Todorov, KO 2014, 'Warm spitzer and palomar near-ir secondary eclipse photometry of two hot jupiters: Wasp-48b and hat-p-23b', Astrophysical Journal, vol. 781, no. 2, 109. https://doi.org/10.1088/0004-637X/781/2/109
O'Rourke, Joseph G. ; Knutson, Heather A. ; Zhao, Ming ; Fortney, Jonathan J. ; Burrows, Adam ; Agol, Eric ; Deming, Drake ; Désert, Jean Michel ; Howard, Andrew W. ; Lewis, Nikole K. ; Showman, Adam ; Todorov, Kamen O. / Warm spitzer and palomar near-ir secondary eclipse photometry of two hot jupiters : Wasp-48b and hat-p-23b. In: Astrophysical Journal. 2014 ; Vol. 781, No. 2.
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abstract = "We report secondary eclipse photometry of two hot Jupiters, WASP-48b and HAT-P-23b, at 3.6 and 4.5 μm taken with the InfraRed Array Camera aboard the Spitzer Space Telescope during the warm Spitzer mission and in the H and K S bands with the Wide Field IR Camera at the Palomar 200 inch Hale Telescope. WASP-48b and HAT-P-23b are Jupiter-mass and twice Jupiter-mass objects orbiting an old, slightly evolved F star and an early G dwarf star, respectively. In the H, KS , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.047{\%} ± 0.016{\%}, 0.109{\%} ± 0.027{\%}, 0.176{\%} ± 0.013{\%}, and 0.214{\%} ± 0.020{\%} for WASP-48b. In the KS , 3.6 μm, and 4.5 μm bands, respectively, we measure secondary eclipse depths of 0.234{\%} ± 0.046{\%}, 0.248{\%} ± 0.019{\%}, and 0.309{\%} ± 0.026{\%} for HAT-P-23b. For WASP-48b and HAT-P-23b, respectively, we measure delays of 2.6 ± 3.9 minutes and 4.0 ± 2.4 minutes relative to the predicted times of secondary eclipse for circular orbits, placing 2σ upper limits on |ecos ω| of 0.0053 and 0.0080, both of which are consistent with circular orbits. The dayside emission spectra of these planets are well-described by blackbodies with effective temperatures of 2158 ± 100 K (WASP-48b) and 2154 ± 90 K (HAT-P-23b), corresponding to moderate recirculation in the zero albedo case. Our measured eclipse depths are also consistent with one-dimensional radiative transfer models featuring varying degrees of recirculation and weak thermal inversions or no inversions at all. We discuss how the absence of strong temperature inversions on these planets may be related to the activity levels and metallicities of their host stars.",
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