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Title: DETECTION OF SHARP SYMMETRIC FEATURES IN THE CIRCUMBINARY DISK AROUND AK Sco

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.
Authors:
;  [1] ; ; ;  [2] ;  [3] ; ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Department of Astronomy, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm (Sweden)
  2. Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich (Switzerland)
  3. LESIA, Observatoire de Paris—Meudon, CNRS, Université Pierre et Marie Curie, Université Paris Didierot, 5 Place Jules Janssen, F-92195 Meudon (France)
  4. Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany)
  5. Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago (Chile)
  6. Dipartimento di Fisica, University of Padova, Via Marzolo 8, I-35131 Padova (Italy)
  7. Department of Physics and Astronomy, College of Charleston, 66 George Street, Charleston, SC 29424 (United States)
  8. Université Grenoble Alpes, IPAG, F-38000 Grenoble (France)
  9. INAF—Osservatorio Astromonico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova (Italy)
Publication Date:
OSTI Identifier:
22518647
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 816; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BINARY STARS; DETECTION; ENERGY SPECTRA; IMAGES; MORPHOLOGY; PLANETS; SPHERES; VISIBLE RADIATION