Helioseismic inference of the solar radiative opacity
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Buldgen, Gaël Pain, Jean-Christophe Cossé, Philippe Blancard, Christophe Gilleron, Franck Pradhan, Anil Fontes, Christopher J. Colgan, James Noels, Arlette Christensen-Dalsgaard, Joergen Deal, Morgan Ayukov, Sergey V. Baturin, Vladimir A. Oreshina, Anna V. Scuflaire, Richard Pinçon, Charly Lebreton, Yveline Corbard, Thierry Eggenberger, Patrick Hakel, Peter Kilcrease, David P. |
| author_facet | Buldgen, Gaël Pain, Jean-Christophe Cossé, Philippe Blancard, Christophe Gilleron, Franck Pradhan, Anil Fontes, Christopher J. Colgan, James Noels, Arlette Christensen-Dalsgaard, Joergen Deal, Morgan Ayukov, Sergey V. Baturin, Vladimir A. Oreshina, Anna V. Scuflaire, Richard Pinçon, Charly Lebreton, Yveline Corbard, Thierry Eggenberger, Patrick Hakel, Peter Kilcrease, David P. |
| contents | The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current debate on its chemical composition. The problem reaches far beyond chemical abundances and is intimately linked to microscopic and macroscopic physical ingredients of solar models such as radiative opacity, for which experimental results have been recently measured that still await theoretical explanations. We present opacity profiles derived from helioseismic inferences and compare them with detailed theoretical computations of individual element contributions using three different opacity computation codes, in a complementary way to experimental results. We find that our seismic opacity is about 10% higher than theoretical values used in current solar models around 2 million degrees, but lower by 35% than some recent available theoretical values. Using the Sun as a laboratory of fundamental physics, we show that quantitative comparisons between various opacity tables are required to understand the origin of the discrepancies between reported helioseismic, theoretical and experimental opacity values. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_06891 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Helioseismic inference of the solar radiative opacity Buldgen, Gaël Pain, Jean-Christophe Cossé, Philippe Blancard, Christophe Gilleron, Franck Pradhan, Anil Fontes, Christopher J. Colgan, James Noels, Arlette Christensen-Dalsgaard, Joergen Deal, Morgan Ayukov, Sergey V. Baturin, Vladimir A. Oreshina, Anna V. Scuflaire, Richard Pinçon, Charly Lebreton, Yveline Corbard, Thierry Eggenberger, Patrick Hakel, Peter Kilcrease, David P. Solar and Stellar Astrophysics Earth and Planetary Astrophysics The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current debate on its chemical composition. The problem reaches far beyond chemical abundances and is intimately linked to microscopic and macroscopic physical ingredients of solar models such as radiative opacity, for which experimental results have been recently measured that still await theoretical explanations. We present opacity profiles derived from helioseismic inferences and compare them with detailed theoretical computations of individual element contributions using three different opacity computation codes, in a complementary way to experimental results. We find that our seismic opacity is about 10% higher than theoretical values used in current solar models around 2 million degrees, but lower by 35% than some recent available theoretical values. Using the Sun as a laboratory of fundamental physics, we show that quantitative comparisons between various opacity tables are required to understand the origin of the discrepancies between reported helioseismic, theoretical and experimental opacity values. |
| title | Helioseismic inference of the solar radiative opacity |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2504.06891 |