ELODIE spectrograph

ELODIE spectrograph

ELODIE is a high-resolution spectrograph installed at the Observatoire de Haute-Provence 1.93-m reflector in south-eastern France. Its optical instrumentation was developed by André Baranne from the Marseille Observatory. This spectrograph is capable of detecting with an uncanny precision any small shift of a star, caused by the gravitational pull of an exoplanet.

Michel Mayor and Didier Queloz discovered the extrasolar planet 51 Pegasi b in 1995 using this instrument. Over twenty such planets have been found so far with ELODIE. First light was achieved in mid-1993. ELODIE was decommissioned in mid-August 2006 and replaced in September 2006 by SOPHIE, a new instrument of the same type but with much improved features. [ [http://hal.archives-ouvertes.fr/hal-00159126/en/ The ELODIE-SOPHIE Archive in the Virtual Observatory] , S. Ilovaisky, Ph. Prugniel, C. Soubiran, M. Koleva, and H. Le Coroller, in "Astronomical spectroscopy and the Virtual Observatory, Madrid (Spain), March 21-23, 2007", Madrid, 2007.] [ [http://www.obs-hp.fr/www/archive/elodie-for-dummies.html A user's guide to Elodie archive data products] , Elodie archive, Observatoire de Haute Provence. Accessed on line June 15, 2008.]

Characteristics

Spectra cover the 389.5-681.5 nanometre wavelength range in a single exposure, split into 67 orders. The instrument, which is located in a temperature-controlled room, is fed with optical fibers from the Cassegrain focus. One of the unique features of ELODIE is an integrated data reduction pipeline which fully reduces the spectra immediately after acquisition and allows the user to measure highly accurate radial velocities through cross-correlation with a numerical mask. This accuracy can reach ±7 m/s.

Over 34,000 spectra have been taken with this instrument so far, over 20,000 of which are publicly available through a dedicated on-line archive. [ [http://atlas.obs-hp.fr/elodie/ The ELODIE archive] . Accessed on line June 15, 2008.] ELODIE is the result of a collaboration between the observatories of Haute-Provence, Geneva and Marseille. A publication describing the instrument appeared in "Astronomy & Astrophysics Supplements". [ELODIE: A spectrograph for accurate radial velocity measurements, A. Baranne et al., "Astronomy and Astrophysics Supplement" 119 (October 1996), pp.373–390. bibcode|1996A&AS..119..373B]

References

External links

* [http://atlas.obs-hp.fr/elodie/ The ELODIE Archive]


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