BIGRE: a low cross-talk integral field unit tailored for extrasolar planets imaging spectroscopy

Abstract

Integral field spectroscopy (IFS) represents a powerful technique for the detection and characterization of extrasolar planets through high contrast imaging, since it allows 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 non-common 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 (IFU) based on a dual-lenslet device (BIGRE), that solves some of the problems related to the classical 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.

17 pages, 18 figures, accepted for publication in ApJ

References in corpus (13)

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Cited by in corpus (23)

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• Performance of the VLT Planet Finder SPHERE II. Data analysis and Results for IFS in laboratory
• First light of the VLT planet finder SPHERE. II. The physical properties and the architecture of the young systems PZ Tel and HD 1160 revisited
• High-contrast imaging of Sirius~A with VLT/SPHERE: Looking for giant planets down to one astronomical unit
• Testing giant planet formation in the transitional disk of SAO 206462 using deep VLT/SPHERE imaging
• SPHERE dynamical and spectroscopic characterization of HD142527B
• Direct characterization of young giant exoplanets at high spectral resolution by coupling SPHERE and CRIRES+
• Searching for proto-planets with MUSE
• Discovery and Characterization of a Faint Stellar Companion to the A3V Star Zeta Virginis
• SPICES: Spectro-Polarimetric Imaging and Characterization of Exoplanetary Systems
• Orbiting a binary: SPHERE characterisation of the HD 284149 system
• Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the Multi-Core fiber-fed Integral-Field Unit
• The wind-driven halo in high-contrast images I: analysis from the focal plane images of SPHERE
• Apodization in high-contrast long-slit spectroscopy. II. Concept validation and first on-sky results with VLT/SPHERE
• Atmospheric characterization of cold exoplanets using a 1.5-m coronagraphic space telescope
• Simulation of planet detection with the SPHERE IFS
• Impacts of high-contrast image processing on atmospheric retrievals
• Apodization in high-contrast long-slit spectroscopy. Closer, deeper, fainter, cooler
• Complex spectral line profiles resulting from cryogenic deformation of the SINFONI/SPIFFI diffraction gratings
• FFREE: a Fresnel-FRee Experiment for EPICS, the EELT planets imager
• Spectral cube extraction for the VLT/SPHERE IFS: Open-source pipeline with full forward modeling and improved sensitivity
• Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary