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23 July 2008 SPHERE IFS: the spectro differential imager of the VLT for exoplanets search
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Abstract
SPHERE is an exo-solar planet imager, which goal is to detect giant exo-solar planets in the vicinity of bright stars and to characterize them through spectroscopic and polarimetric observations. It is a complete system with a core made of an extreme-Adaptive Optics (AO) turbulence correction, pupil tracker and interferential coronagraphs. At its back end, a differential dual imaging camera and an integral field spectrograph (IFS) work in the Near Infrared (NIR) Y, J, H and Ks bands (0.95 - 2.32μm) and a high resolution polarization camera covers the visible (0.6 - 0.9 μm). The IFS is a low resolution spectrograph (R~50 and R~30) which works in the near IR (0.95-1.7 microns), an ideal wavelength range for the detection of planetary features. In our baseline design the IFU is a new philosophy microlens array of about 145x145 elements designed to reduce as low as possible the contrast. The IFU will cover a field of view of about 1.8 x 1.8 square arcsecs reaching a contrast of 10-7, giving an high contrast and high spatial resolution "imager" able to search for planet well inside the star PSF.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. U. Claudi, M. Turatto, R. G. Gratton, J. Antichi, M. Bonavita, P. Bruno, E. Cascone, V. De Caprio, S. Desidera, E. Giro, D. Mesa, S. Scuderi, K. Dohlen, J. L. Beuzit, and P. Puget "SPHERE IFS: the spectro differential imager of the VLT for exoplanets search", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70143E (23 July 2008); https://doi.org/10.1117/12.788366
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