New disk discovered with VLT/SPHERE around the M star GSC 07396−00759
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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 beta 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 YJ bands and the H2H3 doublet. The disk is clearly detected up to 1.5 '' (similar to 110 au) from the star and appears as a ring, with an inclination i similar to 83 degrees, and a peak density position at similar to 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-J. 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.
ESO CNRS (France) MPIA (Germany) INAF (Italy) FINES (Switzerland) NOVA (Netherlands) European Commission Sixth Framework Programme as part of the Optical Infrared Coordination Network for Astronomy (OPTICON) RII3-Ct-2004-001566 226604 312430 European Commission Seventh Framework Programme as part of the Optical Infrared Coordination Network for Astronomy (OPTICON) RII3-Ct-2004-001566 226604 312430 LabEx OSUG@2020, Investissement d'avenir ANR10 LABX56 "Progetti Premiali" funding scheme of the Italian Ministry of Education, University, and Research project PRIN-INAF The Cradle of Life - GENESIS- SKA (General Conditions in Early Planetary Systems for the rise of life with SKA) ICM Nucleo Milenio de Formacion Planetaria, NPF Universidad de Valparaiso "Programme National de Planetologie" (PNP) of CNRS/INSU - CNES European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant 664931 STFC via the Institute of Astronomy, Cambridge Consolidated Grant ANR of France ANR-16-CE31-0013 Spanish MICINN AyA2011-24052
Artículo de publicación ISI
Quote ItemA&A 613, L6 (2018)
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