binaries: general; planet─disk interactions; planetary systems; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] The Search for Planets Orbiting Two Stars survey aims to study the formation and distribution of planets in binary systems by detecting and characterizing circumbinary planets and their formation environments through direct imaging. With the SPHERE Extreme Adaptive Optics instrument, a good contrast can be achieved even at small (<300 mas) separations from bright stars, which enables studies of planets and disks in a separation range that was previously inaccessible. Here, we report the discovery of resolved scattered light emission from the circumbinary disk around the well-studied young double star AK Sco, at projected separations in the ̃13-40 AU range. The sharp morphology of the imaged feature is surprising, given the smooth appearance of the disk in its spectral energy distribution. We show that the observed morphology can be represented either as a highly eccentric ring around AK Sco, or as two separate spiral arms in the disk, wound in opposite directions. The relative merits of these interpretations are discussed, as well as whether these features may have been caused by one or several circumbinary planets interacting with the disk. <P />Based on observations collected at the European Southern Observatory, Chile, under observing program 095.C-0346(B).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Janson, Markus; Department of Astronomy, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
Thalmann, Christian; Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
Boccaletti, Anthony; LESIA, Observatoire de Paris—Meudon, CNRS, Université Pierre et Marie Curie, Université Paris Didierot, 5 Place Jules Janssen, F-92195 Meudon, France
Maire, Anne-Lise ; Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany ; INAF—Osservatorio Astromonico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Zurlo, Alice; Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Millennium Nucleus “Protoplanetary Disk,” Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Marzari, Francesco; Dipartimento di Fisica, University of Padova, Via Marzolo 8, I-35131 Padova, Italy
Meyer, Michael R.; Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
Carson, Joseph C.; Department of Physics and Astronomy, College of Charleston, 66 George Street, Charleston, SC 29424, USA ; Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Augereau, Jean-Charles; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France
Garufi, Antonio; Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
Henning, Thomas; Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
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