Green astro-comb for HARPS-N

摘要

Searches for Earth-like exoplanets using the stellar radial velocity measurements require accuracy &10 cm/s over years.To achieve such high accuracy requires a wavelength reference that provides many calibration lines with fractionalfrequency accuracy of 10sup-10/sup in the visible spectral range. We have developed a green astro-comb that generates ~6000 lines equally spaced by ~0.15 Å over 1000-Å bandwidth (centered at 5500 Å). The frequency of each line is directly locked to a frequency standard with fractional accuracy of 10sup-12/sup over decades. We plan to bring this green astro-comb to the HARPS-north spectrograph at the TNG telescope for tests in 2012.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.