{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,29]],"date-time":"2026-01-29T18:17:09Z","timestamp":1769710629107,"version":"3.49.0"},"reference-count":24,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2026,1,29]],"date-time":"2026-01-29T00:00:00Z","timestamp":1769644800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/04434\/2025"],"award-info":[{"award-number":["UID\/04434\/2025"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"ERC","award":["772293"],"award-info":[{"award-number":["772293"]}]},{"name":"ERC","award":["10101965"],"award-info":[{"award-number":["10101965"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2025,12,31]]},"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:p>\n                    <jats:italic>Context.<\/jats:italic>\n                    Dipole mixed modes observed in the oscillation pattern of red giant stars probe the radiative regions in the stellar core.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Aims.<\/jats:italic>\n                    Oscillation spectra of helium-core-burning stars sometimes show extra peaks that remain unexplained by the dipole mixed-mode pattern expected from the coupling of a radiative cavity in the stellar core and a pressure cavity in the stellar envelope.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Methods.<\/jats:italic>\n                    We use the asymptotic expansion developed for a multi-cavity star in order to characterize these extra peaks.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Results.<\/jats:italic>\n                    The analytical resonance condition of the multi-cavity gravito-acoustic modes, with two inner gravity cavities and an outer pressure cavity, helps us explain that the apparent extra peaks are dipole mixed modes that follow the three-cavity oscillation pattern. The derivation of the two asymptotic period spacings associated with the two distinct regions in the radiative core provides an estimate of the full radiative cavity.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Conclusions.<\/jats:italic>\n                    Our results provide new constraints for analyzing the overshoot or mixing in the core of helium-core-burning stars. An important structure discontinuity inside the radiative core may explain the larger than expected observed period spacings.\n                  <\/jats:p>","DOI":"10.1051\/0004-6361\/202558345","type":"journal-article","created":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T19:45:47Z","timestamp":1768419947000},"page":"L5","source":"Crossref","is-referenced-by-count":0,"title":["Extra modes in helium-core-burning stars probing an infra core cavity"],"prefix":"10.1051","volume":"706","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7547-1208","authenticated-orcid":false,"given":"B.","family":"Mosser","sequence":"first","affiliation":[{"name":"LIRA, Observatoire de Paris, Universit\u00e9 PSL, CNRS, Sorbonne Universit\u00e9, Universit\u00e9 Paris Cit\u00e9, CY Cergy Paris Universit\u00e9","place":["France"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9430-001X","authenticated-orcid":false,"given":"M.","family":"Takata","sequence":"additional","affiliation":[{"name":"Department of Astronomy, School of Science, The University of Tokyo","place":["Japan"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5490-7033","authenticated-orcid":false,"given":"C.","family":"Pin\u00e7on","sequence":"additional","affiliation":[{"name":"LIRA, Observatoire de Paris, Universit\u00e9 PSL, CNRS, Sorbonne Universit\u00e9, Universit\u00e9 Paris Cit\u00e9, CY Cergy Paris Universit\u00e9","place":["France"]},{"name":"Universit\u00e9 Paris-Saclay, CNRS, Institut d\u2019Astrophysique Spatiale","place":["France"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8237-7343","authenticated-orcid":false,"given":"M. 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