Antonio Manescau

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We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such as atomic clocks. Such ‘frequency combs’ provide a series of narrow modes which are uniformly spaced according to the laser’s pulse repetition rate and whose(More)
The best spectrographs are limited in stability by their calibration light source. Laser frequency combs are the ideal calibrators for astronomical spectrographs. They emit a spectrum of lines that are equally spaced in frequency and that are as accurate and stable as the atomic clock relative to which the comb is stabilized. Absolute calibration provides(More)
A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require measurements of Doppler velocity drifts of approximately 1 centimeter per second per year, and astronomical spectrographs have not yet been calibrated to this tolerance.(More)
We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such as atomic clocks. Such ‘frequency combs’ provide a series of narrow modes which are uniformly spaced according to the laser’s pulse repetition rate and whose(More)
A number of outstanding scientific problems require a high resolution, visual spectrograph at the E-ELT. Measuring the dynamics of the universe, finding earth-like planets with radial velocity techniques, determining the chemical evolution of the intergalactic medium and if physical constants varied in the past, all require a superior capability of(More)
S. Cristiani()(), G. Avila(), P. Bonifacio()(), F. Bouchy(), B. Carswell(), S. D’Odorico(), V. D’Odorico(), B. Delabre(), H. Dekker() M. Dessauges(), P. Dimarcantonio(), R. Garcia-Lopez(), A. Grazian(), M. Haehnelt(), J. M. Herreros(), G. Israelian(), S. Levshakov(), J. Liske(), C. Lovis(), A. Manescau(), E. Martin(), M. Mayor(), D. Megevand(), P. Molaro(),(More)
EMIR is a near-infrared, multi-slit camera-spectrograph under development for the 10m GTC on La Palma. It will deliver up to 45 independent R=3500-4000 spectra of sources over a field of view (FOV) of 6’x3’, and allow NIR (Z, J, H, K) imaging over a 6’x6’ FOV, with spatial sampling of 0.175”/pixel. The prime science goal of the instrument is to open Kband,(More)
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