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Proceedings Paper

Telluric-line subtraction in high-accuracy velocimetry: a PCA-based approach
Author(s): Étienne Artigau; Nicola Astudillo-Defru; Xavier Delfosse; François Bouchy; Xavier Bonfils; Christophe Lovis; Francesco Pepe; Claire Moutou; Jean-François Donati; René Doyon; Lison Malo
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Paper Abstract

Optical velocimetry has led to the detection of more than 500 planets to date and there is a strong effort to push m/s velocimetry to the near-infrared to access cooler and lighter stars. The presence of numerous telluric absorption lines in the nIR brings an important challenge. As the star’s barycentric velocity varies through the year, the telluric absorption lines effectively varies in velocity relative to the star’s spectrum by the same amount leading to important systematic RV offsets. We present a novel Principal component analysis-based approach for telluric line subtraction and demonstrated its effectiveness with archival HARPS data for GJ436 and τ Ceti, over parts of the R-band that contain strong telluric absorption lines. The main results are: 1) a better RV accuracy with excluding only a few percentage of the domain, 2) better use of the entire spectrum to measure RV and 3) a higher telescope time efficency by using A0V telluric standard from telescope archive.

Paper Details

Date Published: 28 July 2014
PDF: 11 pages
Proc. SPIE 9149, Observatory Operations: Strategies, Processes, and Systems V, 914905 (28 July 2014); doi: 10.1117/12.2056385
Show Author Affiliations
Étienne Artigau, Observatorie du Mont-Mégantic, Univ. de Montréal (Canada)
Nicola Astudillo-Defru, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Joseph Fourier (France)
Xavier Delfosse, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Joseph Fourier (France)
François Bouchy, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Xavier Bonfils, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Christophe Lovis, Observatoire Astronomique de l’Univ. de Genève (Switzerland)
Francesco Pepe, Observatoire Astronomique de l’Univ. de Genève (Switzerland)
Claire Moutou, Canada-France-Hawaii Telescope Corp. (United States)
Jean-François Donati, Institut de Recherche en Astrophysique et Planétologie, CNRS, Univ. de Toulouse (France)
René Doyon, Observatorie du Mont-Mégantic, Univ. de Montréal (Canada)
Lison Malo, Canada-France-Hawaii Telescope Corp. (United States)


Published in SPIE Proceedings Vol. 9149:
Observatory Operations: Strategies, Processes, and Systems V
Alison B. Peck; Chris R. Benn; Robert L. Seaman, Editor(s)

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