The IAG Solar Flux Atlas: Telluric Correction With a Semi-Empirical Model. (arXiv:2001.02615v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Baker_A/0/1/0/all/0/1">Ashley D. Baker</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Blake_C/0/1/0/all/0/1">Cullen H. Blake</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reiners_A/0/1/0/all/0/1">Ansgar Reiners</a>
Observations of the Sun as a star have been key to guiding models of stellar
atmospheres and additionally provide useful insights on the effects of
granulation and stellar activity on radial velocity measurements. Most high
resolution solar atlases contain telluric lines that span the optical and limit
the spectral regions useful for analysis. We present here a telluric-corrected
solar atlas covering 0.5-1.0 micron derived from solar spectra taken with a
Fourier Transform Spectrograph (FTS) at the Institut f”ur Astrophysik,
G”ottingen. This atlas is the highest resolution spectrum with a wavelength
calibration precise to +/-10 m/s across this 500 nm spectral window. We find
that the atlas matches to within 3% of the telluric-corrected Kitt Peak atlas
in regions containing telluric absorption weaker than 50% in transmission. The
telluric component of the spectral data is fit with a semi-empirical model
composed of Lorentz profiles initialized to the HITRAN parameters for each
absorption feature. Comparisons between the best-fit telluric parameters
describing the Lorentz profile for each absorption feature to the original
HITRAN values in general show excellent agreement considering the effects
atmospheric pressure and temperature have on our final parameters. However, we
identify a small subset of absorption features with larger offsets relative to
the catalogued line parameters. We make our final solar atlas available online.
We additionally make available the telluric spectra extracted from the data
that, given the high resolution of the spectrum, would be useful for studying
the time evolution of telluric line shapes and their impact on Doppler
measurements.
Observations of the Sun as a star have been key to guiding models of stellar
atmospheres and additionally provide useful insights on the effects of
granulation and stellar activity on radial velocity measurements. Most high
resolution solar atlases contain telluric lines that span the optical and limit
the spectral regions useful for analysis. We present here a telluric-corrected
solar atlas covering 0.5-1.0 micron derived from solar spectra taken with a
Fourier Transform Spectrograph (FTS) at the Institut f”ur Astrophysik,
G”ottingen. This atlas is the highest resolution spectrum with a wavelength
calibration precise to +/-10 m/s across this 500 nm spectral window. We find
that the atlas matches to within 3% of the telluric-corrected Kitt Peak atlas
in regions containing telluric absorption weaker than 50% in transmission. The
telluric component of the spectral data is fit with a semi-empirical model
composed of Lorentz profiles initialized to the HITRAN parameters for each
absorption feature. Comparisons between the best-fit telluric parameters
describing the Lorentz profile for each absorption feature to the original
HITRAN values in general show excellent agreement considering the effects
atmospheric pressure and temperature have on our final parameters. However, we
identify a small subset of absorption features with larger offsets relative to
the catalogued line parameters. We make our final solar atlas available online.
We additionally make available the telluric spectra extracted from the data
that, given the high resolution of the spectrum, would be useful for studying
the time evolution of telluric line shapes and their impact on Doppler
measurements.
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