A 400-3500 nm spectroscopy through a common-path interfero coronagraph instrument on 600 mm telescope on RS ISS


A. Tavrov(1), O. Korablev(1), L. Ksanfomaliti(1), V. Gnedykh(1), A. Rodin(1), J. Nishikwa(2), M. Tamura(2), M. Takeda(3), T. Kurokawa(4)


(1) IKI-RAS Space Research Institute of RAS, Moscow, Russia; (2) National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; (3) The University of Electro-Communications, 1-5-1, Chofugaoka, Chofu, Tokyo, Japan; (4) Tokyo University of Agriculture and Technology, 2-24-16, Nakamachi, Koganei-shi, Japan


A 10e6…10e10 high-contrast coronagraphy is required to image and to characterize extra-solar planetary systems among other faint astronomical targets observed in the vicinity of bright objects. Stellar coronagraphy becomes a rapidly evolving field with many enhanced alternatives to the classical Lyot coronagraph. In this list, an interfero-coronagraph (AIC) is advanced because its wide achromaticity and because its leading spatial resolution specified as the IWA. We developed a common-path achromatic interfero-coronagraph CP-AIC to maintain an OPD trend in an AIC method. At next we proposed the tandem TCP-AIC to obtain a 10e10 coronagraphic contrast at 0.8•λ/D IWA by the ratio of planet to star separation to the stellar size at 0.01•λ/D as considering the Earth-Sun pair. Perspective survey for exoplanets and for faint contrast astronomical objects combines coronagraphy and spectroscopy to enable a material- and potential bio-markers recognition. Solar System planetology has a wide use of observing spectroscopy from surface geology to atmosphere climatology. A 600 mm space telescope is scheduled to monitor the planets spectral identities on the board of Russian Segment of ISS. Among the telescope instruments is a stellar coronagraph (CP-AIC) with a CCD camera observing in a visible wavelength range. CP-AIC is co-linked with a low resolution spectrometer covering 1000…3500 nm to identify the spectral characteristics of faint objects. Special efforts correct a 600 mm telescope pointing error.

Attached documents

Lyot2010proc s9 poster TavrovA.pdf
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