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We find that in SU Aur the H\u00a0\u03b1 line\u2019s flux at radial velocity RV \u00a0=\u00a0\u221250\u00a0\u00b1\u00a07 \u2009km\u2009s\u22121 varies with a period P = 255\u00a0\u00b1\u00a05\u00a0d. A similar effect previously discovered in RY Tau is confirmed with these new data: P = 21.6\u00a0d at RV \u00a0=\u00a0\u221295\u00a0\u00b1\u00a05 \u2009km\u00a0s. In both stars, the radial velocity of these variations, the period, and the mass of the star turn out to be related by Kepler\u2019s law, suggesting structural features on the disc plane orbiting at radii of 0.2 au in RY Tau and 0.9 au in SU Aur, respectively. Both stars have a large inclination of the accretion disc to the line of sight \u2013 so that the line of sight passes through the region of the disc wind. We propose there is an azimuthal asymmetry in the disc wind, presumably in the form of \u2018density streams,\u2019 caused by substructures of the accretion disc surface. These streams cannot dissipate until they go beyond the Alfven surface in the disc\u2019s magnetic field. These findings open up the possibility to learn about the structure of the inner accretion disc of CTTS on scales less than 1 au and to reveal the orbital distances related to the planet\u2019s formation.<\/jats:p>","DOI":"10.1093\/mnras\/stad2252","type":"journal-article","created":{"date-parts":[[2023,7,26]],"date-time":"2023-07-26T20:04:34Z","timestamp":1690401874000},"page":"5944-5953","source":"Crossref","is-referenced-by-count":4,"title":["Density streams in the disc winds of Classical T Tauri stars"],"prefix":"10.1093","volume":"524","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5551-4963","authenticated-orcid":false,"given":"P P","family":"Petrov","sequence":"first","affiliation":[{"name":"Crimean Astrophysical Observatory , p\/o Nauchny, 298409, Republic of Crimea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5707-8448","authenticated-orcid":false,"given":"K N","family":"Grankin","sequence":"additional","affiliation":[{"name":"Crimean Astrophysical Observatory , p\/o Nauchny, 298409, Republic of Crimea"}]},{"given":"E V","family":"Babina","sequence":"additional","affiliation":[{"name":"Crimean Astrophysical Observatory , p\/o Nauchny, 298409, Republic of Crimea"}]},{"given":"S A","family":"Artemenko","sequence":"additional","affiliation":[{"name":"Crimean Astrophysical Observatory , p\/o Nauchny, 298409, Republic of Crimea"}]},{"given":"M M","family":"Romanova","sequence":"additional","affiliation":[{"name":"Cornell University , Ithaca, NY 14853, USA"}]},{"given":"S Yu","family":"Gorda","sequence":"additional","affiliation":[{"name":"Ural Federal University , 51, Lenin av., Ekaterinburg 620000, Russia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6316-9880","authenticated-orcid":false,"given":"A A","family":"Djupvik","sequence":"additional","affiliation":[{"name":"Nordic Optical Telescope , Rambla Jos\u00e9 Ana Fern\u00e1ndez P\u00e9rez, 7, E-38711 Bre\u00f1a Baja, Spain"},{"name":"Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1970-7001","authenticated-orcid":false,"given":"J F","family":"Gameiro","sequence":"additional","affiliation":[{"name":"Instituto de Astrof\u00edsica e Ci\u00eancias do Espa\u00e7o, Universidade do Porto , CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal"},{"name":"Departamento de F\u00edsica e Astronomia, Faculdade de Ci\u00eancias, Universidade do Porto , Rua do Campo Alegre 687, P-4169-007 Porto, Portugal"}]}],"member":"286","published-online":{"date-parts":[[2023,7,27]]},"reference":[{"key":"2024072700014696500_bib1","doi-asserted-by":"publisher","first-page":"1029","DOI":"10.1051\/0004-6361:200810025","volume":"493","author":"Agra-Amboage","year":"2009","journal-title":"A&A"},{"key":"2024072700014696500_bib2","doi-asserted-by":"publisher","first-page":"165","DOI":"10.3847\/1538-3881\/ab0ae4","volume":"157","author":"Akiyama","year":"2019","journal-title":"AJ"},{"key":"2024072700014696500_bib3","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1051\/0004-6361\/201834263","volume":"620","author":"Alencar","year":"2018","journal-title":"A&A"},{"key":"2024072700014696500_bib4","doi-asserted-by":"publisher","first-page":"483","DOI":"10.1146\/annurev-astro-031220-010302","volume":"58","author":"Andrews","year":"2020","journal-title":"ARA&A"},{"key":"2024072700014696500_bib5","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-662-58687-7","volume-title":"From Protoplanetary Disks to Planet Formation, Saas-Fee Advanced Course, Volume 45. 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