
Proceedings Paper
Methods for the detection and the characterization of low mass companions using the IFS of SPHEREFormat | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
SPHERE is an instrument aimed to the search for low mass companions around young stars in the solar neighborhood. To achieve this goal light from the host star (and in particular the speckle pattern due to the telescope aberrations) should be strongly attenuated while avoiding to cancel out the light from the faint companion. Different techniques can be used to fulfill this aim exploiting the multi-wavelength datacube produced by the Integral Field Spectrograph that is one of the scientific modules that composes SPHERE. In particular we have tested the application of the Spectral Deconvolution and of the Principal Components Analysis techniques. Both of them allow us to obtained a contrast better than 10−5 with respect to the central star at separations of the order of 0.4 arcsec. A further improvement of one order of magnitude can be obtained by combining one of these techniques to the Angular Differential Imaging. To investigate the expected performance of IFS in characterizing detected objects we injected in laboratory data synthetics planets with different intrinsic fluxes and projected separations from the host star. We performed a complete astrometric and photometric analysis of these images to evaluate the expected errors on these measurements, the spectral fidelity and the differences between the reduction methods. The main issue is to avoid the strong self-cancellation that is inherent to all the reduction methods. We have in particular tested two possible solutions: the use of a mask during the reduction on the positions of the companions or, alternatively, using a KLIP procedure for the IFS. This latter seems to give better results in respect o the classical PCA, allowing us to obtain a good spectral reconstruction for simulated objects down to a contrast of ~10-5.
Paper Details
Date Published: 6 August 2014
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914770 (6 August 2014); doi: 10.1117/12.2055085
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914770 (6 August 2014); doi: 10.1117/12.2055085
Show Author Affiliations
A. Zurlo, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
INAF - Osservatorio Astronomico di Padova (Italy)
D. Mesa, INAF - Osservatorio Astronomico di Padova (Italy)
R. Gratton, INAF - Osservatorio Astronomico di Padova (Italy)
R. Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
S. Desidera, INAF - Osservatorio Astronomico di Padova (Italy)
E. Giro, INAF - Osservatorio Astronomico di Padova (Italy)
J.-L. Beuzit, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
K. Dohlen, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
D. Mouillet, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
P. Puget, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Wildi, Observatoire de Genève, Univ. de Genève (Switzerland)
M. Feldt, Max-Planck-Institut für Astronomie (Germany)
O. Moeller-Nilsson, Max-Planck-Institut für Astronomie (Germany)
INAF - Osservatorio Astronomico di Padova (Italy)
D. Mesa, INAF - Osservatorio Astronomico di Padova (Italy)
R. Gratton, INAF - Osservatorio Astronomico di Padova (Italy)
R. Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
S. Desidera, INAF - Osservatorio Astronomico di Padova (Italy)
E. Giro, INAF - Osservatorio Astronomico di Padova (Italy)
J.-L. Beuzit, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
K. Dohlen, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
D. Mouillet, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
P. Puget, Univ. Joseph Fourier-Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Wildi, Observatoire de Genève, Univ. de Genève (Switzerland)
M. Feldt, Max-Planck-Institut für Astronomie (Germany)
O. Moeller-Nilsson, Max-Planck-Institut für Astronomie (Germany)
A. Baruffolo, INAF - Osservatorio Astronomico di Padova (Italy)
D. Fantinel, INAF - Osservatorio Astronomico di Padova (Italy)
B. Salasnich, INAF - Osservatorio Astronomico di Padova (Italy)
M. Kasper, European Southern Observatory (Germany)
A. Costille, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
J.-F. Sauvage, ONERA (France)
A. Vigan, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
C. Moutou, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
M. Langlois, Ctr. de Recherche Astronomique de Lyon, CNRS, Univ. Lyon 1 (France)
J. Antichi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Pavlov, Max-Planck-Institut für Astronomie (Germany)
N. Zimmerman, European Southern Observatory (Germany)
M. Turatto, INAF - Osservatorio Astronomico di Padova (Italy)
D. Fantinel, INAF - Osservatorio Astronomico di Padova (Italy)
B. Salasnich, INAF - Osservatorio Astronomico di Padova (Italy)
M. Kasper, European Southern Observatory (Germany)
A. Costille, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
J.-F. Sauvage, ONERA (France)
A. Vigan, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
C. Moutou, Aix Marseille Univ., CNRS, Lab. d’Astrophysique de Marseille (France)
M. Langlois, Ctr. de Recherche Astronomique de Lyon, CNRS, Univ. Lyon 1 (France)
J. Antichi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Pavlov, Max-Planck-Institut für Astronomie (Germany)
N. Zimmerman, European Southern Observatory (Germany)
M. Turatto, INAF - Osservatorio Astronomico di Padova (Italy)
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
© SPIE. Terms of Use
