VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B
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2018-08-07Metadata
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Maire, A.-L.
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VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B
Author
- Maire, A.-L.;
- Rodet, L.;
- Lazzoni, C.;
- Boccaletti, A.;
- Brandner, W.;
- Galicher, R.;
- Cantalloube, F.;
- Mesa, D.;
- Klahr, H.;
- Beust, H.;
- Chauvin, G.;
- Desidera, S.;
- Janson, M.;
- Keppler, M.;
- Olofsson, J.;
- Augereau, J. -C.;
- Daemgen, S.;
- Henning, Thomas;
- Thebault, P.;
- Bonnefoy, M.;
- Feldt, M.;
- Gratton, R.;
- Lagrange, Anne Marie;
- Langlois, M.;
- Meyer, M. R.;
- Vigan, A.;
- D'Orazi, V.;
- Hagelberg, J.;
- Coroller, H. Le;
- Ligi, R.;
- Rouan, D.;
- Samland, M.;
- Schmidt, T.;
- Udry, S.;
- Zurlo, A.;
- Abe, L.;
- Carle, M.;
- Delboulbe, A.;
- Feautrier, P.;
- Magnard, Y.;
- Maurel, D.;
- Moulin, T.;
- Pavlov, A.;
- Perret, D.;
- Petit, C.;
- Ramos, J. R.;
- Rigal, F.;
- Roux, A.;
- Weber, L.;
Abstract
Context. A low-mass brown dwarf has recently been imaged around HR 2562 (HD 50571), a star hosting a debris disk resolved in the far infrared. Interestingly, the companion location is compatible with an orbit coplanar with the disk and interior to the debris belt. This feature makes the system a valuable laboratory to analyze the formation of substellar companions in a circumstellar disk and potential disk-companion dynamical interactions.
Aims. We aim to further characterize the orbital motion of HR 2562 B and its interactions with the host star debris disk.
Methods. We performed a monitoring of the system over similar to 10 months in 2016 and 2017 with the VLT/SPHERE exoplanet imager.
Results. We confirm that the companion is comoving with the star and detect for the first time an orbital motion at high significance, with a current orbital motion projected in the plane of the sky of 25 mas (similar to 0.85 au) per year. No orbital curvature is seen in the measurements. An orbital fit of the SPHERE and literature astrometry of the companion without priors on the orbital plane clearly indicates that its orbit is (quasi-)coplanar with the disk. To further constrain the other orbital parameters, we used empirical laws for a companion chaotic zone validated by N-body simulations to test the orbital solutions that are compatible with the estimated disk cavity size. Non-zero eccentricities (>0.15) are allowed for orbital periods shorter than 100 yr, while only moderate eccentricities up to similar to 0.3 for orbital periods longer than 200 yr are compatible with the disk observations. A comparison of synthetic Herschel images to the real data does not allow us to constrain the upper eccentricity of the companion.
Patrocinador
Programme National de Planetologie (PNP)
Programme National de Physique Stellaire (PNPS) of CNRSINSU
French LabEx OSUG@2020
ANR10 LABX56
CNRS
Agence Nationale de la Recherche
ANR-14-CE33-0018
ICM Nucleo Milenio de Formaci6n Planetaria, NPF
ESO
CNRS (France)
MPIA (Germany)
INAF (Italy)
FINES (Switzerland)
NOVA (Netherlands)
European Commission Sixth and Seventh Framework Programs as part of the Optical Infrared Coordination Network for Astronomy (OPTICON)
RII3-Ct-2004-001566
226604
312430
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Artículo de publicación ISI
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Astronomy & Astrophysics Volumen: 615 Número de artículo: A177
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