Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893
1 European Southern Observatory (ESO), Alonso de Córdova 3107, Vitacura, Santiago, Chile
2 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
3 Millenium Nucleus Protoplanetary Disks in ALMA Early Science, Santiago, Chile
4 Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, 19c allée du Six Août, 4000 Liège, Belgium
5 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
6 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
7 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, UK
8 Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Sta. Ma. Tonantzintla, Puebla, Mexico
9 LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
10 Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, USA
11 Steward Observatory, University of Arizona, 933 N Cherry Ave, Tucson, AZ 85719, USA
12 Atacama Large Millimeter/submillimeter Array (ALMA) Santiago Central Offices, Alonso de Córdova 3107, Vitacura, Casilla 763 0355, Santiago, Chile
13 Department of Engineering Sciences, Ångström Laboratory, Uppsala University, PO Box 534, 751 21 Uppsala, Sweden
14 ONERA, The French Aerospace Lab, BP72, 29 avenue de la Division Leclerc, 92322 Chatillon Cedex, France
15 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
16 Department of Astronomy, California Institute of Technology, 1200 E. California Blvd, MC 249-17, Pasadena, CA 91125, USA
Received: 15 October 2016
Accepted: 28 November 2016
Aims. Uncovering the ingredients and the architecture of planetary systems is a very active field of research that has fuelled many new theories on giant planet formation, migration, composition, and interaction with the circumstellar environment. We aim at discovering and studying new such systems, to further expand our knowledge of how low-mass companions form and evolve.
Methods. We obtained high-contrast H-band images of the circumstellar environment of the F5V star HD 206893, known to host a debris disc never detected in scattered light. These observations are part of the SPHERE High Angular Resolution Debris Disc Survey (SHARDDS) using the InfraRed Dual-band Imager and Spectrograph (IRDIS) installed on VLT/SPHERE.
Results. We report the detection of a source with a contrast of 3.6 × 10-5 in the H-band, orbiting at a projected separation of 270 milliarcsec or 10 au, corresponding to a mass in the range 24 to 73 MJup for an age of the system in the range 0.2 to 2 Gyr. The detection was confirmed ten months later with VLT/NaCo, ruling out a background object with no proper motion. A faint extended emission compatible with the disc scattered light signal is also observed.
Conclusions. The detection of a low-mass companion inside a massive debris disc makes this system an analog of other young planetary systems such as β Pictoris, HR 8799 or HD 95086 and requires now further characterisation of both components to understand their interactions.
Key words: brown dwarfs / circumstellar matter / planet-disk interactions / planetary systems
© ESO, 2016