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Janson, M. Langlois, O. Moeller-Nilsson, P. Rabou, P. Thebault, Q. Kral, R. Galicher, R. Gratton, R. Roelfsema, S. Benatti, S. Daemgen, S. Desidera, S. Peretti, T. Bhowmik, T. Scatolin, T. Schmidt, T. Stolker, V. D'Orazi, W. Brandner","submitted_at":"2018-11-26T19:00:02Z","abstract_excerpt":"For a comprehensive understanding of planetary formation and evolution, we need to investigate the environment in which planets form: circumstellar disks. Here we present high-contrast imaging observations of V4046 Sagittarii, a 20-Myr-old close binary known to host a circumbinary disk. We have discovered the presence of rotating shadows in the disk, caused by mutual occultations of the central binary. Shadow-like features are often observed in disks\\cite{garufi,marino15}, but those found thus far have not been due to eclipsing phenomena. 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