Created by Thea Kozakis on 13 September 2020

Spectra of red giant stellar hosts and reflectance/emission planetary spectra as described in Kozakis & Kaltenegger 2020.

File names are explained below.  All spectra file names contain the name of the red giant host, as listed in Table 1 of Kozakis & Kaltenegger 2020. 

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Stellar host spectra

Creation is described in Kozakis & Kaltenegger 2019.

File prefix: stellar_host_spectrum

File format:
Column 0:  wavelength (in angstroms)
Column1:  F_lambda (ergs/s/cm^2/angstrom)

All stellar host spectra are scaled to the solar constant (i.e. as viewed by a planet at the 1 AU equivalent distance).


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Planetary spectra

All planetary spectra are of Earth-like planets orbiting at the 1 AU equivalent distance. Their spectra are available in high resolution (R > 100,000) and slightly processed with R = 10,000.

Cloudy planetary spectra consist of 60% cloud coverage, with 40% of clouds at 1 km, 40% at 6 km, and 20% at 12 km.  Surface albedos are from the USGS Digital Spectral Library and the ASTER Spectral Library (see Kozakis & Kaltenegger 2020 for more details).

File suffixes for different resolutions (note high resolution is only available for relative reflectance/emission):
_hires: R > 100,000
_R=10000:  R = 10,000



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Reflectance spectra:  Planetary spectra from reflected light, both in terms of relative reflectivity and integrated flux for clear-sky and cloudy atmospheres.  Different file prefixes explained below.

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Relative reflectance spectra:
File prefix: relative_reflectance

This spectra show the relative reflectance (normalized to 1.0) for planetary atmospheres with clear skies and cloud decks of specific heights.

File format:
Column 0:  wavelength (in angstroms)
Column1:  relative reflectivity

Cloud file suffixes:
_12km: 12 km clouds
_6km: 6 km clouds
_1km: 1 km clouds
NOTE:  no cloud suffix means it was a clear sky model.

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Integrated flux reflectance spectra:
File prefix: reflectance

Planetary spectra in integrated flux derived from reflected light spectra. Spectra were convolved with host star spectra and land/cloud albedos.

File format:
Column 0: wavelength (in angstroms)
Column 1: integrated flux (ergs/s/cm^2/angstrom)

Suffixes:
_clearsky: clear-sky
_clouds: 60% cloud coverage, described above


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Emission spectra:  Planetary spectra from emission, both in terms of relative reflectivity and integrated flux for clear-sky and cloudy atmospheres.  Different file prefixes explained below.

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Relative emission spectra:
File prefix: relative_emission

This spectra show the relative emission (normalized to 1.0) for planetary atmospheres with clear skies and cloud decks of specific heights.

File format:
Column 0:  wavelength (in angstroms)
Column1:  relative emission

Cloud file suffixes:
_12km: 12 km clouds
_6km: 6 km clouds
_1km: 1 km clouds
NOTE:  no cloud suffix means it was a clear sky model.

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Integrated flux emission spectra:
File prefix: emission

Planetary spectra in integrated flux derived from emission spectra. Spectra were convolved with a blackbody corresponding to the planet's surface temperature.

File format:
Column 0: wavelength (in angstroms)
Column 1: integrated flux (ergs/s/cm^2/angstrom)

Suffixes:
_clearsky: clear-sky
_clouds: 60% cloud coverage, described above


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Combined reflectance and emission spectra
File prefix: combined

Reflectance and emission spectra added together; clear-sky and Earth-like clouds

File format:
Column 0: wavelength (in angstroms)
Column 1: integrated flux (ergs/s/cm^2/angstrom)

Suffixes:
_clearsky: clear-sky
_clouds: 60% cloud coverage, described above