[{"department":[{"_id":"LiBu"}],"status":"public","has_accepted_license":"1","language":[{"iso":"eng"}],"month":"04","fulldoi":"https://doi.org/10.1051/0004-6361/202558428","abstract":[{"text":"Aims. We investigate signatures of pressure extrema on global oscillations in discs.\r\n\r\nMethods. We used the framework of wave topology to establish a generalised local dispersion relation that includes pressure gradients. We highlight the influence of a previously unrecognised epicyclic–acoustic frequency, and we derive an analytical criterion for the existence of a branch of modes transiting between the inertial and the pressure bands, known as topological modes.\r\n\r\nResults. We find that pressure extrema consist of wave guides in which such topological modes propagate. The fundamental mode trapped at a pressure bump can propagate at any frequency, allowing it to resonate with any temporal forcing. Conversely, the fundamental mode associated with a pressure dip propagates at any vertical phase velocity. These specific features make them attractive candidates for future discoseismology.","lang":"eng"}],"date_updated":"2026-10-07T12:17:34Z","day":"01","date_created":"2026-10-04T22:01:54Z","volume":708,"DOAJ_listed":"1","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"type":"journal_article","article_processing_charge":"No","publication_identifier":{"issn":["0004-6361"],"eissn":["1432-0746"]},"title":"Radial modes of pressure bumps and dips in astrophysical discs","arxiv":1,"date_published":"2026-04-01T00:00:00Z","file_date_updated":"2026-10-07T12:13:55Z","scopus_import":"1","publication":"Astronomy and Astrophysics","author":[{"last_name":"Leclerc","first_name":"Armand","full_name":"Leclerc, Armand","id":"2a1fb1fc-f373-11ef-901a-87cee43a1217"},{"last_name":"Laibe","first_name":"Guillaume","full_name":"Laibe, Guillaume"},{"last_name":"Lynch","full_name":"Lynch, Elliot","first_name":"Elliot"},{"last_name":"Perez","full_name":"Perez, Nicolas","first_name":"Nicolas"}],"external_id":{"arxiv":["2512.05737"]},"_id":"23047","dataavailabilitystatement":"The scripts written and used for numerical calculations\r\nare accessible at https://github.com/ArmandLeclerc/\r\nradialStratifDisc.","acknowledgement":"AL was funded by Contrat Doctoral Spécifique Normaliens during this work. GL, EL and NP acknowledge funding from\r\nERC CoG project PODCAST No 864965. AL acknowledges funding\r\nfrom ERC StG project Calcifer No 101165631. We used Mathematica\r\n(Wolfram Research Inc, 2024).\r\n","oa_version":"Published Version","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"A. Leclerc, G. Laibe, E. Lynch, and N. Perez, “Radial modes of pressure bumps and dips in astrophysical discs,” <i>Astronomy and Astrophysics</i>, vol. 708. EDP Sciences, 2026.","apa":"Leclerc, A., Laibe, G., Lynch, E., &#38; Perez, N. (2026). Radial modes of pressure bumps and dips in astrophysical discs. <i>Astronomy and Astrophysics</i>. EDP Sciences. <a href=\"https://doi.org/10.1051/0004-6361/202558428\">https://doi.org/10.1051/0004-6361/202558428</a>","ista":"Leclerc A, Laibe G, Lynch E, Perez N. 2026. Radial modes of pressure bumps and dips in astrophysical discs. Astronomy and Astrophysics. 708, A355.","mla":"Leclerc, Armand, et al. “Radial Modes of Pressure Bumps and Dips in Astrophysical Discs.” <i>Astronomy and Astrophysics</i>, vol. 708, A355, EDP Sciences, 2026, doi:<a href=\"https://doi.org/10.1051/0004-6361/202558428\">10.1051/0004-6361/202558428</a>.","chicago":"Leclerc, Armand, Guillaume Laibe, Elliot Lynch, and Nicolas Perez. “Radial Modes of Pressure Bumps and Dips in Astrophysical Discs.” <i>Astronomy and Astrophysics</i>. EDP Sciences, 2026. <a href=\"https://doi.org/10.1051/0004-6361/202558428\">https://doi.org/10.1051/0004-6361/202558428</a>.","short":"A. Leclerc, G. Laibe, E. Lynch, N. Perez, Astronomy and Astrophysics 708 (2026).","ama":"Leclerc A, Laibe G, Lynch E, Perez N. Radial modes of pressure bumps and dips in astrophysical discs. <i>Astronomy and Astrophysics</i>. 2026;708. doi:<a href=\"https://doi.org/10.1051/0004-6361/202558428\">10.1051/0004-6361/202558428</a>"},"publication_status":"published","PlanS_conform":"1","researchdata_availability":"no","corr_author":"1","doi":"10.1051/0004-6361/202558428","year":"2026","quality_controlled":"1","ddc":["520"],"publisher":"EDP Sciences","OA_type":"diamond","intvolume":"       708","keyword":["accretion","accretion disks","hydrodynamics","instabilities","waves","protoplanetary disks"],"file":[{"date_updated":"2026-10-07T12:13:55Z","file_name":"2026_AstronomyAstrophysics_Leclerc.pdf","success":1,"creator":"dernst","access_level":"open_access","checksum":"868c1be53a4f3e0cf2852a723fcacd08","file_id":"23075","file_size":10533299,"relation":"main_file","content_type":"application/pdf","date_created":"2026-10-07T12:13:55Z"}],"supplementarymaterial":"yes","article_number":"A355","article_type":"original","OA_place":"publisher","das_tickbox":"1","oa":1,"project":[{"_id":"914d8549-16d5-11f0-9cad-bbe6324c93a9","grant_number":"101165631","name":"Unveiling the mysteries of stellar dynamics: a pioneering journey in magnetoasteroseismology"}]}]