stars: individual: GSC 07396-00759; techniques: high angular resolution; protoplanetary disks; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] Debris disks are usually detected through the infrared excess over the photospheric level of their host star. The most favorable stars for disk detection are those with spectral types between A and K, while the statistics for debris disks detected around low-mass M-type stars is very low, either because they are rare or because they are more difficult to detect. Terrestrial planets, on the other hand, may be common around M-type stars. Here, we report on the discovery of an extended (likely) debris disk around the M-dwarf GSC 07396-00759. The star is a wide companion of the close accreting binary V4046 Sgr. The system probably is a member of the β Pictoris Moving Group. We resolve the disk in scattered light, exploiting high-contrast, high-resolution imagery with the two near-infrared subsystems of the VLT/SPHERE instrument, operating in the Y J bands and the H2H3 doublet. The disk is clearly detected up to 1.5[SUP]''[/SUP] ( 110 au) from the star and appears as a ring, with an inclination i 83°, and a peak density position at 70 au. The spatial extension of the disk suggests that the dust dynamics is affected by a strong stellar wind, showing similarities with the AU Mic system that has also been resolved with SPHERE. The images show faint asymmetric structures at the widest separation in the northwest side. We also set an upper limit for the presence of giant planets to 2 M[SUB]J[/SUB]. Finally, we note that the 2 resolved disks around M-type stars of 30 such stars observed with SPHERE are viewed close to edge-on, suggesting that a significant population of debris disks around M dwarfs could remain undetected because of an unfavorable orientation. <P />Based on data collected at the European Southern Observatory, Chile (ESO Program 198.C-0298).
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Vigan, A.; Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
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Langlois, M.; CRAL, UMR 5574, CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, 69364, Lyon Cedex 07, France ; Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
Boccaletti, A.; LESIA, Observatoire de Paris-Meudon, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92195, Meudon, France
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Lazzoni, C.; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy ; Dipartimento di Fisica e Astronomia - Universita' di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy
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Messina, S.; INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania, Italy
Sezestre, E.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Thébault, P.; LESIA, Observatoire de Paris-Meudon, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92195, Meudon, France
Zurlo, A.; Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile ; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Bhowmik, T.; LESIA, Observatoire de Paris-Meudon, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92195, Meudon, France
Bonnefoy, M.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Chauvin, G.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France ; Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
Feldt, M.; Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Hagelberg, J.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Lagrange, A.-M.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Janson, M.; Department of Astronomy, Stockholm University, AlbaNova University Center, 106 91, Stockholm, Sweden ; Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Maire, Anne-Lise ; Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Ménard, F.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Schlieder, J.; Exoplanets and Stellar Astrophysics Laboratory, Code 667, NASA Goddard Space Flight Center, Greenbelt, MD, 20770, USA ; Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
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Ramos, J.; Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
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