skip to main content

SciTech ConnectSciTech Connect

Title: CLOUD BASE SIGNATURE IN TRANSMISSION SPECTRA OF EXOPLANET ATMOSPHERES

We present an analytical model for the transmission spectrum of a transiting exoplanet, showing that a cloud base can produce an observable inflection point in the spectrum. The wavelength and magnitude of the inflection can be used to break the degeneracy between the atmospheric pressure and the abundance of the main cloud material, however, the abundance still depends on cloud particle size. An observed inflection also provides a specific point on the atmospheric P-T profile, giving us a ''thermometer'' to directly validate or rule out postulated cloud species. We apply the model to the transit spectrum of HD 189733b.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Bay Area Environmental Research Institute, NASA Ames Research Center, Moffett Field, CA (United States)
  2. Space Science Division, Ames Research Center, Moffett Field, CA (United States)
  3. Astronomy Department, University of California, Santa Cruz, CA (United States)
Publication Date:
OSTI Identifier:
22365749
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; ABUNDANCE; ATMOSPHERIC PRESSURE; CLOUDS; PARTICLE SIZE; PLANETARY ATMOSPHERES; PLANETS; RADIANT HEAT TRANSFER; SATELLITE ATMOSPHERES; SCATTERING; WAVELENGTHS