Solar System Bodies for Exoplanet Comparison

We present a catalog of spectra and geometric albedos, representative of the different types of Solar System bodies, from 0.45 to 2.5 microns. Our catalog provides a baseline for comparison of exoplanet observations to 18 bodies in our own Solar System, which can assist in the prioritization of exoplanets for time intensive follow-up with next generation Extremely Large Telescopes (ELTs) and space based direct observation missions. We calculate and cross reference the albedos of 8 planets, 8 moons, and 2 dwarf planets from several sources for our analysis. Using high and low-resolution spectra, we also derive colors for these bodies and explore how a color-color diagram can be used to tentatively distinguish between rocky, icy, and gaseous exoplanets before being confirmed through follow-up observations. We explore how the colors of Solar System analog bodies would change when orbiting different host stars. This catalog of Solar System spectra and albedos is available for download through the Carl Sagan Institute.

We will also discuss how this may be used in 1D climate simulations by implementing a wavelength dependent surface albedo instead of a single value. In addition to providing a more accurate approximation, a wavelength dependent surface albedo allows models to more realistically calculate the surface temperatures of exoplanets with the same surfaces but around different stars.

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