We overview a recently developed planetary radiative transfer (RT) model, PLANETS (PLANETary Spectroscopy), which is based on the MODTRAN® 5 band model RT algorithms. The basic features and RT algorithms are described and an application of PLANETS to a variety of observed Neptune spectra, spanning a broad spectral region, ultraviolet through far infrared, is highlighted. We also apply PLANETS to analysis of the recently reported observation of the thermal infrared emission spectrum of the exoplanet HR 8799c. We attribute the observed spectral features to CH4 transmission and emission lines, located to the blue and red of the 4.3 μm CO2 band edge, respectively.

“Hyperspectral” is a relatively new descriptor for measurement techniques historically used by the atmospheric remote sensing communities. As opposed to “multi-spectral” sensing, which includes any instrument with a finite number of specific channels, filters, or bands, hyperspectral implies employing enough (usually contiguous) channels to provide redundant information on both the characteristics of the surface and the atmosphere when the instrument is configured for nadir viewing. This definition (Alex Goetz, Univ. of Colorado, private communication) can be contrasted with others, such as ‘any instrument with better than 4 cm -1 resolution.” This latter definition can be inadequate in the infrared spectral range because many overlapping molecular systems will not be sufficiently discriminated at such ‘narrow’ resolution. However, the 4 cm -1 resolution is often much more than adequate in the visible, when typical resolutions of 10 nm (e.g. AVIRIS, Green et al., 1996) at 600 nm corresponds to a frequency resolution of over 200 cm -1 .

Journal Article Co-trimoxazole Get access L.S. BERNSTEIN, L.S. BERNSTEIN Clinical Research Division, The Wellcome Research LaboratoriesLangley Court, Beckenham, Kent BR3 3BS, England Search for other works by this author on: Oxford Academic PubMed Google Scholar J. LENOX-SMITH J. LENOX-SMITH Clinical Research Department, Roche Products Ltd.,P.O. Box 8, Welwyn Garden City, Hertfordshire AL7 3AY, England Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Antimicrobial Chemotherapy, Volume 11, Issue 2, February 1983, Page 195, https://doi.org/10.1093/jac/11.2.195 Published: 01 February 1983

This paper demonstrates the impact of these model upgrades. (A more detailed description of the upgradedMODTRAN4 / DISORT interface has been previously presented (Acharya et al., 1999).