SPHERE IRDIS and IFS astrometric strategy and calibration

[en] We present the current results of the astrometric characterization of the VLT planet finder SPHERE over 2 years of on-sky operations. We first describe the criteria for the selection of the astrometric fields used for calibrating the science data: binaries, multiple systems, and stellar clusters. The analysis includes measurements of the pixel scale and the position angle with respect to the North for both near-infrared subsystems, the camera IRDIS and the integral field spectrometer IFS, as well as the distortion for the IRDIS camera. The IRDIS distortion is shown to be dominated by an anamorphism of 0.60+/-0.02% between the horizontal and vertical directions of the detector, i.e. 6 mas at 1 arcsec. The anamorphism is produced by the cylindrical mirrors in the common path structure hence common to all three SPHERE science subsystems (IRDIS, IFS, and ZIMPOL), except for the relative orientation of their field of view. The current estimates of the pixel scale and North angle for IRDIS are 12.255+/-0.009 milliarcseconds/pixel for H2 coronagraphic images and -1.70+/-0.08°. Analyses of the IFS data indicate a pixel scale of 7.46+/-0.02 milliarcseconds/pixel and a North angle of -102.18+/-0.13°. We finally discuss plans for providing astrometric calibration to the SPHERE users outside the instrument consortium. <P />

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Maire, Anne-Lise ; Max-Planck-Institut für Astronomie (Germany)

Langlois, Maud; Ctr. de Recherche Astrophysique de Lyon, Univ. Lyon, Univ. Lyon 1, CNRS (France)

Dohlen, Kjetil; Lab. d'Astrophysique de Marseille (France)

Lagrange, Anne-Marie; Institut de Planétologie et d'Astrophysique de Grenoble (France)

Gratton, Raffaele; INAF - Osservatorio Astronomico di Padova (Italy)

Chauvin, Gaël; Institut de Planétologie et d'Astrophysique de Grenoble (France)

Desidera, Silvano; INAF - Osservatorio Astronomico di Padova (Italy)

Girard, Julien H.; European Southern Observatory (Chile)

Milli, Julien; European Southern Observatory (Chile)

Vigan, Arthur; Lab. d'Astrophysique de Marseille (France)

More authors (9 more)

Language :

English

Title :

SPHERE IRDIS and IFS astrometric strategy and calibration

Publication date :

01 August 2016

Event name :

SPIE Astronomical Telescopes + Instrumentation

Event date :

26 June - 1 July, 2016

Main work title :

Ground-based and Airborne Instrumentation for Astronomy VI

Pages :

990834

Additional URL :

https://ui.adsabs.harvard.edu/abs/2016SPIE.9908E..34M

Commentary :

9908

Available on ORBi :

since 22 January 2020

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