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tokens: Acknowledgements RL thanks Centre National d'Études Spatiales (CNES) for financial support through its post-doctoral programme. This work has been carried out in part within National Competence in Research PlanetS, supported by the Swiss National Science Foundation. The authors thank the European Southern Observatory (ESO) Paranal Staff for support for conducting the observations. We also warmly thank H. Méheut for useful discussions about vortices. We acknowledge financial support from the Programme National de Planétologie and the Programme National de Physique Stellaire of Centre National de la Recherche Scientifique - Institut National des Sciences de l'Univers (CNRS-INSU). This work has also been supported by a grant from the French Labex OSUG@2020 (Investissements d'avenir; ANR10 LABX56). The project is supported by CNRS and by the Agence Nationale de la Recherche (ANR; ANR-14-CE33-0018). MB acknowledges funding from ANR of France under contract number ANR-16-CE31-0013 (Planet Forming Discs). This work made use of the SPHERE Data Centre, jointly operated by Observatoire des Sciences de l'Univers de Grenoble (OSUG)/Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) (Grenoble), PYTHEAS/Laboratoire d'Astrophysique de Marseille (LAM)/Centre de donnéeS Astrophysiques de Marseille (CéSAM) (Marseilles), Observatoire de la Côte d'Azur (OCA)/Lagrange (Nice) and Observatoire de Paris/Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) (Paris). We thank P. Delorme and E. Lagadec (SPHERE Data Centre) for their efficient help during the data reduction process. SPHERE is an instrument designed and built by a consortium consisting of IPAG (Grenoble, France), Max Planck Institute for Astronomy (MPIA, Heidelberg, Germany), LAM (Marseille, France), LESIA (Paris, France), Laboratoire Lagrange (Nice, France), Istituto Nazionale de Astrofisica (INAF)-Osservatorio di Padova (Italy), Observatoire astronomique de l'Université de Genève (Switzerland), Eidgenössische Technische Hochschule (ETH) Zurich (Switzerland), Nederlandse Onderzoekschool Voor Astronomie (NOVA) (Netherlands), Office National d'Etudes et de Recherches Aérospatiales (ONERA) (France) and the Netherlands Institute for Radio Astronomy (ASTRON) (Netherlands) in collaboration with ESO. SPHERE was funded by ESO, with additional contributions from CNRS (France), MPIA (Germany), INAF (Italy), FINES (Switzerland) and NOVA (Netherlands). SPHERE also received funding from the European Commission Sixth and Seventh Framework Programmes as part of the Optical Infrared Coordination Network for Astronomy (OPTICON) under grant RII3-Ct-2004-001566 for FP6 (2004–2008), grant 226604 for FP7 (2009–2012) and grant 312430 for FP7 (2013–2016). We acknowledge the use of the electronic database from CDS, Strasbourg and electronic bibliography maintained by the NASA/ADS system. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.