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http://hdl.handle.net/20.500.12386/27818
Titolo: | Broadband near-infrared astronomical spectrometer calibration and on-sky validation with an electro-optic laser frequency comb | Autori: | Obrzud, E. RAINER, Monica Harutyunyan, A. Chazelas, B. Cecconi, M. Ghedina, A. MOLINARI, Emilio Carlo Kundermann, S. Lecomte, S. Pepe, F. Wildi, F. Bouchy, F. Herr, T. |
Data pubblicazione: | 2018 | Rivista: | OPTICS EXPRESS | Numero: | 26 | Fascicolo: | 26 | Da pagina:: | 34830 | Abstract: | The quest for extrasolar planets and their characterisation as well as studies of fundamental physics on cosmological scales rely on capabilities of high-resolution astronomical spectroscopy. A central requirement is a precise wavelength calibration of astronomical spectrographs allowing for extraction of subtle wavelength shifts from the spectra of stars and quasars. Here, we present an all-fibre, 400 nm wide near-infrared frequency comb based on electro-optic modulation with 14.5 GHz comb line spacing. Tests on the high-resolution, near-infrared spectrometer GIANO-B show a photon-noise limited calibration precision of <10 cm/s as required for Earth-like planet detection. Moreover, the presented comb provides detailed insight into particularities of the spectrograph such as detector inhomogeneities and differential spectrograph drifts. The system is validated in on-sky observations of a radial velocity standard star (HD221354) and telluric atmospheric absorption features. The advantages of the system include simplicity, robustness and turn-key operation, features that are valuable at the observation sites. | URI: | http://hdl.handle.net/20.500.12386/27818 | URL: | https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-26-34830 | ISSN: | 1094-4087 | DOI: | 10.1364/OE.26.034830 | Bibcode ADS: | 2018OExpr..2634830O | Fulltext: | open |
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