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Article Dans Une Revue The Astrophysical Journal Année : 2009

BIGRE: A Low Cross-Talk Integral Field Unit Tailored for Extrasolar Planets Imaging Spectroscopy

Kjetil Dohlen
  • Fonction : Auteur
Raffaele G. Gratton
  • Fonction : Auteur
Dino Mesa
  • Fonction : Auteur
Riccardo U. Claudi
  • Fonction : Auteur
Enrico Giro
  • Fonction : Auteur
Anthony Boccaletti
Jean-Luc Beuzit

Résumé

Integral field spectroscopy represents a powerful technique for the detection and characterization of extrasolar planets through high-contrast imaging since it allows us to obtain simultaneously a large number of monochromatic images. These can be used to calibrate and then to reduce the impact of speckles, once their chromatic dependence is taken into account. The main concern in designing integral field spectrographs for high-contrast imaging is the impact of the diffraction effects and the noncommon path aberrations together with an efficient use of the detector pixels. We focus our attention on integral field spectrographs based on lenslet arrays, discussing the main features of these designs: the conditions of appropriate spatial and spectral sampling of the resulting spectrograph's slit functions and their related cross-talk terms when the system works at the diffraction limit. We present a new scheme for the integral field unit based on a dual-lenslet device (BIGRE), that solves some of the problems related to the classical Traitement Intégral des Galaxies par l'Étude de leurs Rays (TIGER) design when used for such applications. We show that BIGRE provides much lower cross-talk signals than TIGER, allowing a more efficient use of the detector pixels and a considerable saving of the overall cost of a lenslet-based integral field spectrograph.

Dates et versions

hal-00479868 , version 1 (03-05-2010)

Identifiants

Citer

Jacopo Antichi, Kjetil Dohlen, Raffaele G. Gratton, Dino Mesa, Riccardo U. Claudi, et al.. BIGRE: A Low Cross-Talk Integral Field Unit Tailored for Extrasolar Planets Imaging Spectroscopy. The Astrophysical Journal, 2009, 695, pp.1042. ⟨10.1088/0004-637X/695/2/1042⟩. ⟨hal-00479868⟩
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