• Publications
  • Influence
Infrared radiation from an extrasolar planet
A class of extrasolar giant planets—the so-called ‘hot Jupiters’ (ref. 1)—orbit within 0.05 au of their primary stars (1 au is the Sun–Earth distance). These planets should be hot and so emit
Spitzer Transit and Secondary Eclipse Photometry of GJ 436b
We report the results of infrared (8 μm) transit and secondary eclipse photometry of the hot Neptune exoplanet, GJ 436b using Spitzer. The nearly photon-limited precision of these data allows us to
Strong infrared emission from the extrasolar planet HD 189733b
We report detection of strong infrared thermal emission from the nearby (d = 19 pc) transiting extrasolar planet HD 189733b by measuring the flux decrement during its prominent secondary eclipse. A 6
A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b
TLDR
It is found that the extremely irradiated atmosphere of WASP-12b lacks a prominent thermal inversion (or stratosphere) and has very efficient day–night energy circulation, in stark contrast to theoretical predictions for the most highly irradiated hot-Jupiter atmospheres.
A spectrum of an extrasolar planet
TLDR
Observations of the infrared spectrum of the transiting extrasolar planet HD 209458b reveal a hot thermal continuum for the planetary spectrum, with an approximately constant ratio to the stellar flux over this wavelength range.
Possible thermochemical disequilibrium in the atmosphere of the exoplanet GJ 436b
TLDR
The detection of planetary thermal emission from the dayside of GJ 436b at multiple infrared wavelengths during the secondary eclipse is reported, finding a high CO abundance and a substantial methane (CH4) deficiency relative to thermochemical equilibrium models for the predicted hydrogen-dominated atmosphere.
On the orbit of exoplanet WASP-12b
TLDR
An orbit fit to all the available transit, eclipse, and radial-velocity data indicates precession at <1σ; a non-precessing solution fits better; comment on analysis and reporting for Spitzer exoplanet data in light of recent re-analyses.
Deciphering the Atmospheric Composition of WASP-12b: A Comprehensive Analysis of its Dayside Emission
WASP-12b was the first planet reported to have a carbon-to-oxygen ratio (C/O) greater than one in its dayside atmosphere. However, recent work to further characterize its atmosphere and confirm its
The hottest planet
TLDR
Direct detection of thermal emission from the smallest known transiting planet, HD 149026b, that indicates a brightness temperature of 2,300 ± 200 K at 8 µm is reported, which may give rise to novel atmospheric properties yet to be investigated.
A New Search for Carbon Monoxide Absorption in the Transmission Spectrum of the Extrasolar Planet HD 209458b
We have revisited the search for carbon monoxide absorption features in transmission during the transit of the extrasolar planet HD 209458b. In 2002 August-September we acquired a total of 1077
...
...