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We present an intensive monitoring of high-resolution spectra of the Ca ii K line in the A7IV shell star φ Leo at very short (minutes, hours), short (night to night), and medium (weeks, months) timescales. The spectra show remarkable variable absorptions on timescales of hours, days, and months. The characteristics of these sporadic events are very similar(More)
(2014). Can eccentric debris disks be long-lived? A first numerical investigation and application to 2 Reticuli. Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page.(More)
We present high spatial resolution observations and detailed multi-wavelength modeling of the structure and composition of two prominent debris disks and a systematic study on the observability of planet-disk interaction in debris disks with present and future instruments. As the spatial structure of debris disks is, in addition to stellar gravity and(More)