{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,22]],"date-time":"2025-12-22T08:54:12Z","timestamp":1766393652061,"version":"3.48.0"},"reference-count":72,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2025,12,22]],"date-time":"2025-12-22T00:00:00Z","timestamp":1766361600000},"content-version":"vor","delay-in-days":21,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2025,10,26]]},"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:p>\n                    <jats:italic>Context<\/jats:italic>\n                    . Magnetic winds are a key mechanism for angular momentum removal in young stars.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Aims<\/jats:italic>\n                    . We aim to characterize the multi-component outflow of RU Lup, link discrete absorption components in resonance lines to forbidden-line emission, and quantify the mass loading, lever arms, and torque carried by the wind.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Methods<\/jats:italic>\n                    . The high resolution of the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) allowed us to perform a detailed study of the forbidden emission lines and the blueshifted absorption in the lines of the Na I and Ca II doublets, which we resolved in three discrete absorption components at low, medium, and high velocities. We developed a method that disentangles vertical and toroidal velocities in the absorption components and infers the launching radius\n                    <jats:italic>r<\/jats:italic>\n                    <jats:sub>0<\/jats:sub>\n                    , magnetic lever arm\n                    <jats:italic>\u03bb<\/jats:italic>\n                    , and\n                    <jats:italic>\u1e40<\/jats:italic>\n                    <jats:sub>wind<\/jats:sub>\n                    .\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Results<\/jats:italic>\n                    . We identify a low-velocity broad component in the [O I] 5577 line, consistent with a rotating magnetohydrodynamic disk wind launched near the disk truncation radius. We show that the discrete absorption components trace spatially and physically distinct regions of the outflow. The high-velocity absorption component is connected to the high-velocity component of the forbidden lines and it is formed in a knot in the large-scale, low-density jet. The medium- and low-velocity components are launched from the inner disk (\n                    <jats:italic>r<\/jats:italic>\n                    <jats:sub>0<\/jats:sub>\n                    \u2272 6.76\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>\u22c6<\/jats:sub>\n                    ) with low lever arms indicative of warm, highly mass-loaded streamlines. The two components differ mainly in their vertical velocity. The low-velocity absorption is consistent with an outer absorbing shell, whereas the medium-velocity absorption forms near the disk truncation radius. Its higher vertical velocity is compatible with either a slightly larger lever arm or additional heating at the base of the flow. For plausible ionization levels in the inner disk, this outflow component removes a substantial fraction of the accretion spin-up torque.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Conclusions<\/jats:italic>\n                    . RU Lup hosts a stratified, rotating, warm disk wind launched across a narrow annulus near the disk truncation radius, which is sufficiently mass-loaded to extract a large fraction of the stellar spin-up torque. These observations disfavor an X-wind scenario.\n                  <\/jats:p>","DOI":"10.1051\/0004-6361\/202554624","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T19:43:28Z","timestamp":1763581408000},"page":"A263","source":"Crossref","is-referenced-by-count":0,"title":["Spinning-down RU Lup"],"prefix":"10.1051","volume":"704","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8533-168X","authenticated-orcid":false,"given":"A.","family":"Armeni","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Astronomie und Astrophysik, Eberhard Karls Universit\u00e4t T\u00fcbingen","place":["Germany"]},{"name":"INAF \u2013 Osservatorio Astronomico di Capodimonte","place":["Italy"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4929-5703","authenticated-orcid":false,"given":"B.","family":"Stelzer","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Astronomie und Astrophysik, Eberhard Karls Universit\u00e4t T\u00fcbingen","place":["Germany"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0474-0896","authenticated-orcid":false,"given":"A.","family":"Frasca","sequence":"additional","affiliation":[{"name":"INAF \u2013 Osservatorio Astrofisico di Catania","place":["Italy"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3562-262X","authenticated-orcid":false,"given":"C. 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