The IAG spectral atlas of the spatially resolved Sun: Centre-to-limb observations
M. Ellwarth, S. Sch\"afer, A. Reiners, M. Zechmeister

TL;DR
This paper presents a high-resolution, high-accuracy spectral atlas of the Sun across different viewing angles, aiding in understanding solar atmospheric processes and improving radial velocity measurements for exoplanet studies.
Contribution
The authors provide the first high-resolution, high-frequency accuracy centre-to-limb solar spectral atlas covering 4200-8000 Å with 14 heliocentric positions, including detailed line profile analysis.
Findings
Line profiles are consistent with previous observations.
Identified differences between observed and model line profiles near the limb.
The atlas improves reference templates for solar and exoplanet research.
Abstract
Solar surface magneto-convection appears as granulation pattern that impacts spectral lines in terms of both shape and wavelength. Such induced effects also tend to vary over the observed solar disc because of the changing observation angle and, thus, the changing observation height as well. Centre-to-limb observations of the resolved Sun offer an insight into the variable spectral behaviour across different heliocentric observing positions, providing crucial information about limb darkening, convective velocities, and line profile variability relevant to radial velocity (RV) calculations. Thus, RV measurements and exoplanet transit spectroscopy depend on precise reference templates. We want to provide a spectroscopic centre-to-limb solar atlas at high spectral resolution and high-frequency accuracy. The atlas shall help improve the understanding of the solar atmosphere and convection…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Solar and Space Plasma Dynamics · Astronomy and Astrophysical Research
