Thermal Emission of Exoplanet XO-1b
arXiv:0805.2418 · doi:10.1086/590140
Abstract
We estimate flux ratios of the extrasolar planet XO-1b to its host star XO-1 at 3.6, 4.5, 5.8 and 8.0 microns with the IRAC on the Spitzer Space Telescope to be 0.00086 +/- 0.00007, 0.00122 +/- 0.00009, 0.00261 +/- 0.00031 and 0.00210 +/- 0.00029, respectively. The fluxes are inconsistent with a canonical cloudless model for the thermal emission from a planet and suggest an atmosphere with a thermal inversion layer and a possible stratospheric absorber. A newly emerging correlation between the presence of a thermal inversion layer in the planetary atmosphere and stellar insolation of the planet (Burrows et al. 2007b) is refined. The sub-stellar point flux from the parent star at XO-1b of ~ 0.49 x 10^9 erg cm^-2 s^-1 sets a new lower limit for the occurrence of a thermal inversion in a planetary atmosphere.
7 pages, 4 figures, 2 tables, accepted for publication to ApJ
References in corpus (12)
- Detection of Thermal Emission from an Extrasolar Planet
- Improved parameters for extrasolar transiting planets
- Theoretical Spectra and Light Curves of Close-in Extrasolar Giant Planets and Comparison with Data
- Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands
- Strong Infrared Emission from the Extrasolar Planet HD189733b
- The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
- A Spectrum of an Extrasolar Planet
- Spitzer Transit and Secondary Eclipse Photometry of GJ 436b
- Theory for the Secondary Eclipse Fluxes, Spectra, Atmospheres, and Light Curves of Transiting Extrasolar Giant Planets
- A Transiting Planet of a Sun-like Star
- A Sensitive Search for Variability in Late L Dwarfs: The Quest for Weather
- Analysis of Spitzer Spectra of Irradiated Planets: Evidence for Water Vapor?
Cited by in corpus (17)
- Can TiO Explain Thermal Inversions in the Upper Atmospheres of Irradiated Giant Planets?
- Atmospheric Sulfur Photochemistry on Hot Jupiters
- Spitzer Secondary Eclipses of the Dense, Modestly-irradiated, Giant Exoplanet HAT-P-20b Using Pixel-Level Decorrelation
- Pseudo 2D chemical model of hot Jupiter atmospheres: application to HD 209458b and HD 189733b
- Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b
- New Analysis Indicates No Thermal Inversion in the Atmosphere of HD 209458b
- C/O Ratios of Stars with Transiting Hot Jupiter Exoplanets
- Evidence against a strong thermal inversion in HD 209458 b from high-dispersion spectroscopy
- A transition between the hot and the ultra-hot Jupiter atmospheres
- Evidence for disequilibrium chemistry from vertical mixing in hot Jupiter atmospheres. A comprehensive survey of transiting close-in gas giant exoplanets with warm-Spitzer/IRAC
- The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
- Colour-magnitude diagrams of transiting Exoplanets - II. A larger sample from photometric distances
- High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
- Search for TiO and Optical Night-side Emission from the Exoplanet WASP-33b
- Trends in Spitzer Secondary Eclipses
- Atmospheric heat redistribution effect on Emission spectra of Hot-Jupiters
- Effect of clouds on emission spectra for Super Venus