Chemistry (all); Biochemistry, Genetics and Molecular Biology (all); Multidisciplinary; Physics and Astronomy (all); astro-ph.SR; astro-ph.EP
Abstract :
[en] 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.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Buldgen, Gaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Pain, Jean-Christophe ; CEA, DAM, DIF, F-91297, Arpajon, France ; Université Paris-Saclay, CEA, LMCE, F-91680, Bruyères le Châtel, France
Cossé, Philippe ; CEA, DAM, DIF, F-91297, Arpajon, France ; Université Paris-Saclay, CEA, LMCE, F-91680, Bruyères le Châtel, France
Blancard, Christophe; CEA, DAM, DIF, F-91297, Arpajon, France ; Université Paris-Saclay, CEA, LMCE, F-91680, Bruyères le Châtel, France
Gilleron, Franck; CEA, DAM, DIF, F-91297, Arpajon, France ; Université Paris-Saclay, CEA, LMCE, F-91680, Bruyères le Châtel, France
Pradhan, Anil K; Ohio State University, Dept. Astronomy, Columbus, OH, 43210, USA
Fontes, Christopher J ; Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
Colgan, James ; Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
Noels, Arlette; STAR Institute, Université de Liège, Allée du 6 août, 19C, 4000, Liège, Belgium
Christensen-Dalsgaard, Jørgen ; Stellar Astrophysics Centre and Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
Deal, Morgan; LUPM, Université de Montpellier, CNRS, Place Eugène Bataillon, 34095, Montpellier, France ; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762, Porto, Portugal
Ayukov, Sergey V; Sternberg Astronomical Institute, Lomonosov Moscow State University, 119234, Moscow, Russia
Baturin, Vladimir A; Sternberg Astronomical Institute, Lomonosov Moscow State University, 119234, Moscow, Russia
Oreshina, Anna V; Sternberg Astronomical Institute, Lomonosov Moscow State University, 119234, Moscow, Russia
Scuflaire, Richard ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Pinçon, Charly ; Université Paris-Saclay, Institut dÁstrophysique Spatiale, UMR 8617, CNRS, Bâtiment 121, 91405, Orsay Cedex, France
Lebreton, Yveline; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, 5 place Jules Janssen, 92195, Meudon, France ; Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, 35000, Rennes, France
Corbard, Thierry ; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France
Eggenberger, Patrick ; Département d'Astronomie, Université de Genève, Chemin Pegasi 51, CH-1290, Versoix, Switzerland
Salmon, Sébastien; STAR Institute, Université de Liège, Allée du 6 août, 19C, 4000, Liège, Belgium
Hakel, Peter ; Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
Kilcrease, David P; Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung
Funding text :
G.B. acknowledges funding from the SNF AMBIZIONE grant No 185805 (Seismic inversions and modeling of transport processes in stars) and from the Fonds National de la Recherche Scientifique (FNRS) as a postdoctoral researcher. M.D. acknowledges support from the Centre National d\u2019Etudes Spatiale (CNES), focused on the PLATO mission. A.P. acknowledges partial support from a grant by the US National Science Foundation. P.E. has received funding from the European Research Council (ERC) under the European Union\u2019s Horizon 2020 research and innovation program (grant agreement No 833925, project STAREX). Funding for the Stellar Astrophysics Centre was provided by The Danish National Research Foundation (Grant DNRF106). J.C., C.J.F., P.H., and D.P.K. were supported by the US Department of Energy through the Los Alamos National Laboratory, which is operated by Triad National Security, LLC, for the National Nuclear Security Administration of US Department of Energy (Contract No. 89233218CNA000001). We acknowledge support by the ISSI team \u201CProbing the core of the Sun and the stars\u201D (ID 423) led by Thierry Appourchaux.
Commentary :
Published in Nature Communications on January 27. The Arxiv version is the version including supplementary figures as part of the Methods Section
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