SVEEEETIES: Singular vector expansion to estimate Earth-like exoplanet temperatures from infrared emission spectra.
作者： Franz Schreier , Steffen Städt , Mareike Godolt , Fabian Wunderlich , John Lee Grenfell
DOI: 10.1051/0004-6361/201936511
关键词:
摘要: Context. Detailed characterizations of exoplanets are moving to the forefront planetary science. Temperature is a key marker for understanding atmospheric physics and chemistry. Aims. We aim retrieve temperatures N2-O2 dominated atmospheres from secondary eclipse spectroscopic observations thermal emission Earth-like orbiting G-, K-, M-stars using large future space telescopes. Methods. Line-by-line radiative transfer was used generate synthetic infrared (TIR) observations. Atmospheric temperature approximated by an expansion with base vectors defined singular value decomposition matrix comprising representative profiles. Nonlinear least squares fitting estimate coefficients. Results. Analysis $4.3 \rm\,\mu m$ $15 CO2 bands in TIR permits inference even low signal-to-noise (S/N) ~5 at medium resolution. Deviations true upper troposphere stratosphere usually few Kelvin, larger deviations atmosphere and, less often, lower troposphere. Although performance two equivalent most cases, longwave more favorable than shortwave due increased star-planet contrast. A high spectral resolution, as provided JWST instruments, important retaining sensitivity atmosphere. Furthermore, selection appropriate set functions also key. Conclusions. mid-atmosphere can be suitably characterized IR spectroscopy resolution 1000 (ideally ~2500). Obtaining necessary S/N could feasible missions, such Origins Space Telescope or Large Interferometer Exoplanets. Meanwhile applicable other classes planets.
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