Bibcode
Spanò, P.; Mégevand, D.; Herreros, J. M.; Zerbi, F. M.; Cabral, A.; di Marcantonio, P.; Lovis, C.; Cristiani, S.; Rebolo, R.; Santos, N.; Pepe, F.
Referencia bibliográfica
Ground-based and Airborne Instrumentation for Astronomy III. Edited by McLean, Ian S.; Ramsay, Suzanne K.; Takami, Hideki. Proceedings of the SPIE, Volume 7735, pp. 77350K-77350K-10 (2010).
Advertised on:
7
2010
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0
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Descripción
ESPRESSO, a very high-resolution, high-efficiency, ultra-high stability,
fiber-fed, cross-dispersed echelle spectrograph located in the
Combined-Coudé focus of the VLT, has been designed to detect
exo-planets with unprecedented radial velocity accuracies of 10 cm/sec
over 20 years period. To increase spectral resolution, an innovative
pupil slicing technique has been adopted, based onto free-form optics.
Anamorphism has been added to increase resolution while keeping the
physical size of the echelle grating within reasonable limits.
Anamorphic VPH grisms will help to decrease detector size, while
maximizing efficiency and inter-order separation. Here we present a
summary of the optical design of the spectrograph and of expected
performances.