Jonay I. González Hernández (IAC)

High precision spectroscopy with HARPS-LFC: the solar gravitational redshift
Wann Am 12.10.2016 von 14:00 bis 15:30
  • Special Seminar
  • Kolloquium
Wo SH Lecture Hall
Termin übernehmen vCal / iCal

The new class of large telescopes with significantly increased light-collecting power will probably alleviate the photon-noise limitation to high precision spectroscopy. Thus a new, more precise calibration source will enhance science cases that need high precision spectroscopy. Since 2006, a collaboration between ESO, MPQ and Menlo GmbH, that later joined the IAC and more recently the UFRN, has been studying the capabilities of laser frequency combs (LFC) as a calibration source for high-resolution astronomical spectrographs. The LFC attached to the ultra-stable spectrograph HARPS (designed to detect exoplanets using the radial velocity technique, Mayor et al. 2003) has been demonstrated to be a very accurate calibration system, achieving short-term repeatability at the level of 2.5 cm/s (Wilken et al. 2012).  One interesting application is the empirical determination of the gravitational redshift of the Sun from accurate measurements of Fe line positions. In this talk I will show some new instrument facilities operating at high spectral resolution together with some science cases that require high precision spectroscopy.