Volume 593, September 2016
|Number of page(s)||12|
|Section||Planets and planetary systems|
|Published online||04 October 2016|
Characterizing HR 3549 B using SPHERE
1 INAF–Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
2 Aix Marseille Université, CNRS, LAM – Laboratoire d’Astrophysique de Marseille, UMR 7326, 13388 Marseille, France
3 Department of Physics and Astronomy, Macquarie University, 2109 Sydney, Australia
4 Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Melbourne, VIC 3800, Australia
5 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
6 Universitè Grenoble Alpes, IPAG, 38000 Grenoble, France
7 CNRS, IPAG, 38000 Grenoble, France
8 CRAL, UMR 5574, CNRS, Université Lyon 1, 9 avenue Charles André, 69561 Saint-Genis-Laval Cedex, France
9 Department of Physics, University of Padova, 35131 Padova, Italy
10 INAF–Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
11 INAF–Osservatorio Astrofisico di Arcetri – L.go E. Fermi 5, 50125 Firenze, Italy
12 Institute for Astronomy, University of Edinburgh, Blackford Hill View, Edinburgh EH9 3HJ, UK
13 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
14 INAF–Astrophysical Observatory of Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
15 YSVP Observatory, 2 Yandra Street Vale Park, 5081 South Australia, Australia
16 Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, 8093 Zurich, Switzerland
17 LESIA, Observatoire de Paris, PSL Research Univ., CNRS, Univ. Paris Diderot, Sorbonne Paris Cité, UPMC Paris 6, Sorbonne Univ., 5 place Jules Janssen, 92195 Meudon Cedex, France
18 INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano, via E. Bassini 15, 20133 Milano, Italy
19 York Creek Observatory, George Town, Tasmania, Australia
20 European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile
21 Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
22 Universidad de Chile, Camino el Observatorio, 1515 Santiago, Chile
Received: 19 April 2016
Accepted: 20 June 2016
Aims. In this work, we characterize the low-mass companion of the A0 field star HR 3549.
Methods. We observed HR 3549B in imaging mode with the near-infrared branch (IFS and IRDIS) of SPHERE at the VLT, with IFS in YJ mode and IRDIS in the H band. We also acquired a medium-resolution spectrum with the IRDIS long-slit spectroscopy mode. The data were reduced using the dedicated SPHERE GTO pipeline, which is custom-designed for this instrument. We employed algorithms such as PCA and TLOCI to reduce the speckle noise.
Results. The companion was clearly visible with both IRDIS and IFS. We obtained photometry in four different bands and also the astrometric position for the companion. Based on our astrometry, we confirm that it is a bound object and set constraints on its orbit. Although several uncertainties still remain, we estimate an age of ~100–150 Myr for this system, yielding a most probable mass for the companion of 40–50 MJup and Teff ~ 2300−2400 K. Compared with template spectra, this points to a spectral type between M9 and L0 for the companion, commensurate with its position on the color–magnitude diagram.
Key words: instrumentation: spectrographs / methods: data analysis / techniques: imaging spectroscopy / planetary systems
© ESO, 2016
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