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Near-Infrared Thermal Emission from the Hot Jupiter TrES-2b: Ground-Based Detection of the Secondary Eclipse
Earth and Planetary Astrophysics · Submitted 17 May 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Our thermal emission measurement when combined with the thermal emission measurements using Spitzer/IRAC from O'Donovan and collaborators suggest that this planet exhibits relatively efficient day to night-side redistribution of heat and a near isothermal dayside atmospheric temperature structure, with a spectrum that is well approximated by a blackbody.
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The abstract, sentence by sentence
We present near-infrared Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-2b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope. We detect its thermal emission with an eclipse depth of 0.062 +/- 0.012% (5-sigma). Our best-fit secondary eclipse is consistent with a circular orbit (a 3-sigma upper limit on the eccentricity, e, and argument or periastron, omega, of |ecos(omega)| < 0.0090), in agreement with mid-infrared detections of the secondary eclipse of this planet. A secondary eclipse of this depth corresponds to a day-side Ks-band brightness temperature of TB = 1636 +/- 88 K. Our thermal emission measurement when combined with the thermal emission measurements using Spitzer/IRAC from O'Donovan and collaborators suggest that this planet exhibits relatively efficient day to night-side redistribution of heat and a near isothermal dayside atmospheric temperature structure, with a spectrum that is well approximated by a blackbody. It is unclear if the atmosphere of TrES-2b requires a temperature inversion; if it does it is likely due to chemical species other than TiO/VO as the atmosphere of TrES-2b is too cool to allow TiO/VO to remain in gaseous form. Our secondary eclipse has the smallest depth of any detected from the ground at around 2 micron to date.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present near-infrared Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-2b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope. | method 0.58 | 0.97 | 0.05 | asserted 0.98 |
| s1 | We detect its thermal emission with an eclipse depth of 0.062 +/- 0.012% (5-sigma). | result 1.00 | 0.97 | 0.58 | asserted 1.00 |
| s2 | Our best-fit secondary eclipse is consistent with a circular orbit (a 3-sigma upper limit on the eccentricity, e, and argument or periastron, omega, of |ecos(omega)| < 0.0090), in agreement with mid-infrared detections of the secondary eclipse of this planet. | result 0.98 | 0.91 | 0.10 | hedged possibility 0.92 |
| s3 | A secondary eclipse of this depth corresponds to a day-side Ks-band brightness temperature of TB = 1636 +/- 88 K. | result 0.99 | 0.94 | 0.26 | asserted 1.00 |
| s4 | Our thermal emission measurement when combined with the thermal emission measurements using Spitzer/IRAC from O'Donovan and collaborators suggest that this planet exhibits relatively efficient day to night-side redistribution of heat and a near isothermal dayside atmospheric temperature structure, with a spectrum that is well approximated by a blackbody. | interpretation 1.00 | 0.74 | 0.42 | hedged possibility 0.92 |
| s5 | It is unclear if the atmosphere of TrES-2b requires a temperature inversion; if it does it is likely due to chemical species other than TiO/VO as the atmosphere of TrES-2b is too cool to allow TiO/VO to remain in gaseous form. | interpretation 0.98 | 0.50 | 0.06 | hedged possibility 0.87 |
| s6 | Our secondary eclipse has the smallest depth of any detected from the ground at around 2 micron to date. | result 0.89 | 0.91 | 0.09 | asserted 0.99 |
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Original abstract
We present near-infrared Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-2b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope. We detect its thermal emission with an eclipse depth of 0.062 +/- 0.012% (5-sigma). Our best-fit secondary eclipse is consistent with a circular orbit (a 3-sigma upper limit on the eccentricity, e, and argument or periastron, omega, of |ecos(omega)| < 0.0090), in agreement with mid-infrared detections of the secondary eclipse of this planet. A secondary eclipse of this depth corresponds to a day-side Ks-band brightness temperature of TB = 1636 +/- 88 K. Our thermal emission measurement when combined with the thermal emission measurements using Spitzer/IRAC from O'Donovan and collaborators suggest that this planet exhibits relatively efficient day to night-side redistribution of heat and a near isothermal dayside atmospheric temperature structure, with a spectrum that is well approximated by a blackbody. It is unclear if the atmosphere of TrES-2b requires a temperature inversion; if it does it is likely due to chemical species other than TiO/VO as the atmosphere of TrES-2b is too cool to allow TiO/VO to remain in gaseous form. Our secondary eclipse has the smallest depth of any detected from the ground at around 2 micron to date.
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