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Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893

Milli, J. and Mawet, D. (2017) Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893. Astronomy and Astrophysics, 597 . Art. No. L2. ISSN 0004-6361. doi:10.1051/0004-6361/201629908.

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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 M_(Jup) 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Milli, J.0000-0001-9325-2511
Mawet, D.0000-0002-8895-4735
Additional Information:© 2016 ESO. Received: 15 October 2016; Accepted: 28 November 2016; Published online 19 December 2016. J.M. is supported by the ESO fellowship programme. He thanks R. Galicher for his re-reduction of the NIRI data, and O. Wertz for his help with VIP and NEGFC. E.C. is supported by NASA through Hubble Fellowship grant HST-HF2-51355 and HST-AR-12652 awarded by STScI, operated by the AURA, Inc., for NASA under contract NAS5-26555. O.A. is a F.R.S.-FNRS Research Associate. The research leading to these results was partly funded by the European Research Council under the European Union’s Seventh Framework Programme (ERC Grant Agreement No. 337569), and by the French Community of Belgium through an ARC grant for Concerted Research Action. G.M.K. is supported by the Royal Society as a Royal Society University Research Fellow. M.C.W. and L.M. are supported by the European Union through ERC grant 279973. V.C. acknowledges J. Smoker and M. Espinoza for their help with NaCo. V.C. is supported by the Millennium Science Initiative (Chilean Ministry of Economy) through grant RC130007. C.d.B. acknowledges support from the Mexican CONACyT research grant CB-2012-183007.
Group:Astronomy Department
Funding AgencyGrant Number
European Southern Observatory (ESO)UNSPECIFIED
NASA Hubble FellowshipHST-HF2-51355
NASA Hubble FellowshipHST-AR-12652
European Research Council (ERC)337569
European Research Council279973
Ministry of Economy (Chile)RC130007
Consejo Nacional de Ciencia y Tecnología (CONACYT)CB-2012-183007
Subject Keywords:brown dwarfs – circumstellar matter – planet-disk interactions – planetary systems
Record Number:CaltechAUTHORS:20170310-131531783
Persistent URL:
Official Citation:Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893 J. Milli, P. Hibon, V. Christiaens, É. Choquet, M. Bonnefoy, G. M. Kennedy, M. C. Wyatt, O. Absil, C. A. Gómez González, C. del Burgo, L. Matrà, J.-C. Augereau, A. Boccaletti, C. Delacroix, S. Ertel, W. R. F. Dent, P. Forsberg, T. Fusco, J. H. Girard, S. Habraken, E. Huby, M. Karlsson, A.-M. Lagrange, D. Mawet, D. Mouillet, M. Perrin, C. Pinte, L. Pueyo, C. Reyes, R. Soummer, J. Surdej, Y. Tarricq and Z. Wahhaj A&A, 597 (2017) L2 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75033
Deposited By: Tony Diaz
Deposited On:10 Mar 2017 22:36
Last Modified:15 Nov 2021 16:30

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