J/A+A/609/A34 VUV absorption cross section of CO2 (Venot+, 2018)
VUV-absorption cross section of carbon dioxide from 150 to 800 K and
applications to warm exoplanetary atmospheres.
Venot O., Benilan Y., Fray N., Gazeau M.-C., Lefevre F., Es-sebbar Et.,
Hebrard E., Schwell M., Bahrini C., Montmessin F., Lefevre M., Waldmann I.P.
<Astron. Astrophys. 609, A34 (2018)>
=2018A&A...609A..34V 2018A&A...609A..34V (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectra, ultraviolet
Keywords: molecular data - methods: laboratory: molecular -
planets and satellites: atmospheres
Abstract:
We quantify the temperature dependency of the VUV absorption cross
section of carbon dioxide. The VUV absorption cross section of CO2
increases with the temperature. The absorption we measured at 150K
seems to be close to the absorption of CO2 in the fundamental ground
state. The absorption cross section can be separated in two parts: a
continuum and a fine structure superimposed on the continuum. The
variation of the continuum of absorption can be represented by the sum
of three gaussian functions. We used these data in our 1D
thermo-photochemical model in order to study their impact on the
predicted atmospheric composition of warm exoplanets. Using data at
high temperature in thermo-photochemical models modifies significantly
the abundance and the photodissociation rates of many species, in
addition to carbon dioxide, such as methane and ammonia. These
deviations have an impact on synthetic transmission spectra, leading
to variations of up to 5ppm.
Description:
We performed experimental measurements of CO2 absorption cross
section with synchrotron radiation for the wavelength range
(115-200nm). For longer wavelengths (195-230nm), we used a deuterium
lamp and a 1.5m Jobin-Yvon spectrometer. We present a full set of
high resolution (Δλ=0.03nm) absorption cross sections
of CO2 from 115 to 230nm for temperatures ranging from 150 to 800K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
co2_150k.dat 22 1985 Absorption cross section of CO2 at 150K
co2_170k.dat 22 2154 Absorption cross section of CO2 at 170K
co2_195k.dat 22 2345 Absorption cross section of CO2 at 195K
co2_230k.dat 22 2367 Absorption cross section of CO2 at 230K
co2_300k.dat 22 2167 Absorption cross section of CO2 at 300K
co2_420k.dat 22 2040 Absorption cross section of CO2 at 420K
co2_500k.dat 22 2101 Absorption cross section of CO2 at 500K
co2_585k.dat 22 3031 Absorption cross section of CO2 at 585K
co2_700k.dat 22 3127 Absorption cross section of CO2 at 700K
co2_800k.dat 22 3394 Absorption cross section of CO2 at 800K
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Byte-by-byte Description of file: co2*.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 nm lambda [114/230] Wavelength
12- 22 E11.5 cm2 CS Absorption cross section
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Acknowledgements:
Olivia Venot, olivia.venot(at)lisa.u-pec.fr
(End) Olivia Venot [LISA, France], Patricia Vannier [CDS] 26-Sep-2017