Study of the HARPS Line Profile Using a Laser Frequency Comb. Issue Volume 8:Issue S293(2012) (29th April 2014)

• Record Type: Journal Article
• Authors: Zhao, F.; Curto, G. Lo; Pasquini, L.; Zhao, G.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 8:Issue S293(2012)
• Page Start: 407
• Page End: 409
• Publication Date: 2014-04-29
• Subjects: HARPS, -- laser frequency comb, -- radial velocity, -- line profile; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921313013276
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: High precision spectroscopy is one of the most successful methods to detect extra-solar planets. To enable the detection of Earth-like planets in the habitable zone, extremely precise instruments are required. Our lack of knowledge of the instrument line profile, non-linearity and charge transfer efficiency effects in the detector limits the achievable precision of an instrument. We report our studies on the HARPS (High Accuracy Radial- velocity Planet Searcher) line profiles, measured using the unresolved lines of a Laser Frequency Comb (LFC). We show how the line profile changes as a function of position and signal, and estimate the errors made in the line centroid measurement due to the variation of the line profile.