2009/01/22 by J. Antichi, Jacopo Antichi, Kjetil Dohlen +14
Engineering · Mathematics · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Computer science #Detector #Diffraction #Exoplanet #Field (mathematics) #Integral field spectrograph #Mathematics #Optical Polarization and Ellipsometry #Optics #Physics #Pixel #Planet #Speckle pattern #Spectral line #Spectrograph #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.IM
paper · pdf · doi:10.1088/0004-637x/695/2/1042
published as Astrophys.J.695:1042-1057,2009 · 17 pages, 18 figures, accepted for publication in ApJ
arxiv created 2009/01/22 · openalex publication_date 2009/04/07 · arxiv updated 2014/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.