Here we provide an assortment of stellar spectra of interest to planetary modelers, model-generated planetary spectra of Earth, and a collection of line lists and absorption cross-sections for molecules of relevance to planetary atmospheres and biosignatures:
Molecular Line Lists and Absorption Cross-Sections
Of critical importance to our spectrum simulators are spectroscopic line lists, which describe the wavelength and strength of gas absorption lines from the ultraviolet to the far-infrared, as well as how the line shapes depend on various input parameters (e.g. temperature and pressure). These data come from a variety of sources, including lab measurements and theoretical calculations. We maintain this database by collecting data from updated, existing line lists (e.g. HITRAN, GEISA), and compiling data from new, peer-reviewed studies. We also provide a related tool to plot line list data for a user-selected molecule, database, and wavelength/wavenumber range.
Molecular Spectral Search Engine
This tool allows the user to query the HITRAN data and view the spectra of molecules that have features within a given wave number/wavelength range. The user can then identify molecules that correspond to spectroscopic features in spectra obtained by spacecraft or telescopes.
Our stellar spectra include two M-stars: AD Leo (M4.5V) and GJ 644 (M3.5Ve) (Segura, et al, 2005), and five others from publications by the VPL team spanning from far-ultraviolet to far-infrared (the Sun; the F2V HD128167; the G0V low-activity star HD114710; the G0V high-activity star HD206860; and the K2V star HD22049.)
M Star Spectra: Two spectra from Segura, et al, 2005: AD Leo (M4.5V) and GJ 644 (M3.5Ve). Images and Data.
Proxima Centauri Spectrum: UV through MIR composite spectrum from Meadows et al. 2016 Images and Data.
Other Stellar Spectra: Five stellar spectra from publications by the VPL team spanning from far-ultraviolet to far-infrared (the Sun; the F2V HD128167; the G0V low-activity star HD114710; the G0V high-activity star HD206860; and the K2V star HD22049.) Images and Data.
Biological Pigment Spectra
A database of the spectral properties of biological pigments, including absorbance, transmittance, or reflectance. Spectra can be of whole cells, intact membranes, and pigments in solvent extracts. Subjects may include photosynthetic pigments, protective pigments for a variety of functions, cells grown in different environmental treatments, and others.
LCROSS UV-Visible Spectrometer (VSP) Recalibration
A wavelength-dependent recalibration factor derived for the Lunar CRater Observing and Sensing Satellite (LCROSS) UV-visible spectrometer.
Alternative Surface Reflectance Biosignatures
Click below to find synthetic spectra from Schwieterman, Cockell, and Meadows 2015, Astrobiology, 15(5) (SCM15)*