Operation of a broadband visible-wavelength astro-comb with a high-resolution astrophysical spectrograph
Abstrak
Searches for Earth-like exoplanets using the periodic Doppler shift of stellar absorption lines require 10 cm/s precision in the measurement of stellar radial velocity (RV) over timescales of years. Current techniques have led to the discovery of short-period exoplanets that induce RV wobbles as small as ≈1 m/s on their parent stars. It has been suggested that order-of-magnitude improved RV precision may be achievable using an astro-comb, a laser frequency comb optimized for astrophysical spectrograph wavelength calibration. Here we report the development of a broadband visible-wavelength astro-comb and its operation with the HARPS-N spectrograph at the Telescopio Nazionale Galileo in the Canary Islands. This green astro-comb has >7000 narrow (<1 MHz) spectral lines spaced by 16 GHz with relatively uniform line power from 500 to 620 nm. The line frequencies are locked to GPS, enabling us to realize HARPS-N wavelength calibration with RV measurement precision and stability <10 cm/s.
Topik & Kata Kunci
Penulis (12)
A. Glenday
Chih-Hao Li
N. Langellier
G. Chang
Li-Jin Chen
G. Fűrész
A. Zibrov
F. Kärtner
D. Phillips
D. Sasselov
A. Szentgyorgyi
R. Walsworth
Akses Cepat
- Tahun Terbit
- 2015
- Bahasa
- en
- Total Sitasi
- 60×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1364/OPTICA.2.000250
- Akses
- Open Access ✓