Ks-band detection of thermal emission and color constraints to corot-1b: A low-albedo planet with inefficient atmospheric energy redistribution and a temperature inversion

Justin C. Rogers, Daniel Apai, Mercedes López-Morales, David K. Sing, Adam Burrows

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b from time series photometry with the ARC 3.5 m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 0.042% and is centered at phase 0.5022+0.0023 -0.0027, consistent with a zero eccentricity orbit (e cos ω = 0.0035+0.0036 -0.0042). We perform the first optical to near-infrared multi-band photometric analysis of an exoplanet's atmosphere and constrain the reflected and thermal emissions by combining our result with the recent 0.6, 0.71, and 2.09 μm secondary eclipse detections by Snellen etal., Gillon etal., and Alonso etal. Comparing the multi-wavelength detections to state-of-the-art radiative-convective chemical-equilibrium atmosphere models, we find the near-infrared fluxes difficult to reproduce. The closest blackbody-based and physical models provide the following atmosphere parameters: a temperature T = 2460+80 -160 K; a very low Bond albedo AB = 0.000+0.081 -0.000; and an energy redistribution parameter Pn = 0.1, indicating a small but nonzero amount of heat transfer from the day to nightside. The best physical model suggests a thermal inversion layer with an extra optical absorber of opacity κe = 0.05cm2g-1, placed near the 0.1 bar atmospheric pressure level. This inversion layer is located 10 times deeper in the atmosphere than the absorbers used in models to fit mid-infrared Spitzer detections of other irradiated hot Jupiters.

Original languageEnglish (US)
Pages (from-to)1707-1716
Number of pages10
JournalAstrophysical Journal
Volume707
Issue number2
DOIs
StatePublished - 2009
Externally publishedYes

Fingerprint

temperature inversions
temperature inversion
thermal emission
albedo
planets
eclipses
planet
color
atmospheres
inversion layer
atmosphere
Jupiter (planet)
Jupiter
energy
absorbers
near infrared
inversions
extrasolar planets
opacity
eccentricity

Keywords

  • Binaries: eclipsing
  • Planetary systems
  • Stars: individual (CoRoT-1)
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Ks-band detection of thermal emission and color constraints to corot-1b : A low-albedo planet with inefficient atmospheric energy redistribution and a temperature inversion. / Rogers, Justin C.; Apai, Daniel; López-Morales, Mercedes; Sing, David K.; Burrows, Adam.

In: Astrophysical Journal, Vol. 707, No. 2, 2009, p. 1707-1716.

Research output: Contribution to journalArticle

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abstract = "We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b from time series photometry with the ARC 3.5 m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 0.042{\%} and is centered at phase 0.5022+0.0023 -0.0027, consistent with a zero eccentricity orbit (e cos ω = 0.0035+0.0036 -0.0042). We perform the first optical to near-infrared multi-band photometric analysis of an exoplanet's atmosphere and constrain the reflected and thermal emissions by combining our result with the recent 0.6, 0.71, and 2.09 μm secondary eclipse detections by Snellen etal., Gillon etal., and Alonso etal. Comparing the multi-wavelength detections to state-of-the-art radiative-convective chemical-equilibrium atmosphere models, we find the near-infrared fluxes difficult to reproduce. The closest blackbody-based and physical models provide the following atmosphere parameters: a temperature T = 2460+80 -160 K; a very low Bond albedo AB = 0.000+0.081 -0.000; and an energy redistribution parameter Pn = 0.1, indicating a small but nonzero amount of heat transfer from the day to nightside. The best physical model suggests a thermal inversion layer with an extra optical absorber of opacity κe = 0.05cm2g-1, placed near the 0.1 bar atmospheric pressure level. This inversion layer is located 10 times deeper in the atmosphere than the absorbers used in models to fit mid-infrared Spitzer detections of other irradiated hot Jupiters.",
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AU - Burrows, Adam

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N2 - We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b from time series photometry with the ARC 3.5 m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 0.042% and is centered at phase 0.5022+0.0023 -0.0027, consistent with a zero eccentricity orbit (e cos ω = 0.0035+0.0036 -0.0042). We perform the first optical to near-infrared multi-band photometric analysis of an exoplanet's atmosphere and constrain the reflected and thermal emissions by combining our result with the recent 0.6, 0.71, and 2.09 μm secondary eclipse detections by Snellen etal., Gillon etal., and Alonso etal. Comparing the multi-wavelength detections to state-of-the-art radiative-convective chemical-equilibrium atmosphere models, we find the near-infrared fluxes difficult to reproduce. The closest blackbody-based and physical models provide the following atmosphere parameters: a temperature T = 2460+80 -160 K; a very low Bond albedo AB = 0.000+0.081 -0.000; and an energy redistribution parameter Pn = 0.1, indicating a small but nonzero amount of heat transfer from the day to nightside. The best physical model suggests a thermal inversion layer with an extra optical absorber of opacity κe = 0.05cm2g-1, placed near the 0.1 bar atmospheric pressure level. This inversion layer is located 10 times deeper in the atmosphere than the absorbers used in models to fit mid-infrared Spitzer detections of other irradiated hot Jupiters.

AB - We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b from time series photometry with the ARC 3.5 m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 0.042% and is centered at phase 0.5022+0.0023 -0.0027, consistent with a zero eccentricity orbit (e cos ω = 0.0035+0.0036 -0.0042). We perform the first optical to near-infrared multi-band photometric analysis of an exoplanet's atmosphere and constrain the reflected and thermal emissions by combining our result with the recent 0.6, 0.71, and 2.09 μm secondary eclipse detections by Snellen etal., Gillon etal., and Alonso etal. Comparing the multi-wavelength detections to state-of-the-art radiative-convective chemical-equilibrium atmosphere models, we find the near-infrared fluxes difficult to reproduce. The closest blackbody-based and physical models provide the following atmosphere parameters: a temperature T = 2460+80 -160 K; a very low Bond albedo AB = 0.000+0.081 -0.000; and an energy redistribution parameter Pn = 0.1, indicating a small but nonzero amount of heat transfer from the day to nightside. The best physical model suggests a thermal inversion layer with an extra optical absorber of opacity κe = 0.05cm2g-1, placed near the 0.1 bar atmospheric pressure level. This inversion layer is located 10 times deeper in the atmosphere than the absorbers used in models to fit mid-infrared Spitzer detections of other irradiated hot Jupiters.

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