emph{In-situ} determination of astro-comb calibrator lines to better than 10 cm s$^{-1}$ - Astrophysics > Instrumentation and Methods for AstrophysicsReportar como inadecuado




emph{In-situ} determination of astro-comb calibrator lines to better than 10 cm s$^{-1}$ - Astrophysics > Instrumentation and Methods for Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Improved wavelength calibrators for high-resolution astrophysicalspectrographs will be essential for precision radial velocity RV detection ofEarth-like exoplanets and direct observation of cosmological deceleration. Theastro-comb is a combination of an octave-spanning femtosecond laser frequencycomb and a Fabry-P\-erot cavity used to achieve calibrator line spacings thatcan be resolved by an astrophysical spectrograph. Systematic spectral shiftsassociated with the cavity can be 0.1-1 MHz, corresponding to RV errors of10-100 cm-s, due to the dispersive properties of the cavity mirrors over broadspectral widths. Although these systematic shifts are very stable, theircorrection is crucial to high accuracy astrophysical spectroscopy. Here, wedemonstrate an \emph{in-situ} technique to determine the systematic shifts ofastro-comb lines due to finite Fabry-P\-erot cavity dispersion. The techniqueis practical for implementation at a telescope-based spectrograph to enablewavelength calibration accuracy better than 10 cm-s.



Autor: C.-H. Li, A. Glenday, A. J. Benedick, G. Chang, L.-J. Chen, C. Cramer, P. Fendel, G. Furesz, F. Kärtner, S. Korzennik, D. Philli

Fuente: https://arxiv.org/







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