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SIM spectral characteristics and accuracy analysis

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dc.contributor.author Pan, Xiaopei
dc.contributor.author Goullioud, Renaud
dc.contributor.author Yu, Jeffrey
dc.contributor.author Shao, Michael
dc.date.accessioned 2006-03-16T22:38:02Z
dc.date.available 2006-03-16T22:38:02Z
dc.date.issued 2004-06-21
dc.identifier.citation SPIE 2004 Conference on Astronomical Telescopes and Instrumentation, Glasgow, Scotland, June 21-25, 2004 en
dc.identifier.clearanceno 04-1561
dc.identifier.uri http://hdl.handle.net/2014/38885
dc.description.abstract The Space Interferometry Mission (SIM) will perform global astrometry (full sky), local wide-angle (15 degree) and narrow-angle (1 degree) observations to search extra-solar planets, and can calibrate stellar and galactic evolution theories. The astrometric accuracy of the SIM mission depends on spectral characteristics of the optics, detectors and targets. This paper will discuss the photometric throughput of the SIM instrument, and analyze effects of wavefront errors, optical mismatches and control biases as a function of wavelength. The color dependence models of the instrument optics including mirrors, lenses, field-stop and beam-splitter are presented. The performances of different detectors with a variety of coatings are compared. A model of the SIM fringe spectrometer is created. For early and late types of stars, brightness dependency errors are analyzed for different combinations of optics and detectors. Visibility loss due to imperfect optics is investigated in detail. Based on the models of instrument and estimated visibilities, the astrometric accuracies for various kinds of stars are evaluated. It is important to emphasize that not only light sources, mirrors, lenses, field stop and detectors are all wavelength dependent, but also fringe visibility loss, wavefront error, optics control error, etc. are all a function of wavelengths. For the first time the estimate of SIM performance is based on spectral analysis of all factors above, rather than monochromatic approximations of detected fringes, or simply adopted constants. This paper summarizes the astrometric accuracies for a wide range of stars and various combinations of optical design and detector configurations. It has been verified that SIM has astrometric accuracy of about 4 μas for targets with different spectra. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 1338853 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject space interferometry en
dc.subject instruments en
dc.subject spectrum en
dc.subject white light fringe en
dc.title SIM spectral characteristics and accuracy analysis en
dc.type Preprint en


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