ELODIE was anechellespectrograph installed on the 1.93mreflector at theObservatoire de Haute-Provence in south-easternFrance. Its optical instrumentation was developed by André Baranne from theMarseille Observatory. The purpose of the instrument wasextrasolar planet detection by theradial velocity method.
ELODIE'sfirst light was achieved in 1993. The instrument was decommissioned in August 2006 and replaced in September 2006 bySOPHIE, a new instrument of the same type but with improved features.[1][2]
The instrument could observe theelectromagnetic spectrum over awavelength range of 389.5 nm to 681.5 nm in a single exposure, split into 67spectral orders. The instrument, which was located in a temperature-controlled room, was fed withoptical fibers from theCassegrain focus. The observatory provided an integrated data reduction pipeline which fully reduced thespectra immediately after acquisition and allowed the user to measureradial velocities to an accuracy as good as ±7 m/s.
Over 34,000 spectra were taken with ELODIE, over 20,000 of which are publicly available through a dedicated on-line archive.[3] The instrument was the result of a collaboration between the observatories of Haute-Provence,Geneva andMarseille. A publication describing the instrument appeared inAstronomy & Astrophysics Supplements.[4]
The firstextrasolar planet to be discovered orbiting a Sun-like star,51 Pegasi b, was discovered in 1995 using ELODIE.[5]Michel Mayor andDidier Queloz received theNobel Prize in Physics in 2019 for their achievement.[6] Over twenty such planets have been found with ELODIE.
The instrument was also used to find a planet by thetransit method.[7]
| Planet | Announced in | Ref |
|---|---|---|
| 51 Pegasi b | 1995 | [5] |
| Gliese 876 b | 1998 | [8] |
| 14 Herculis b | 1998 | [9] |
| HD 209458 b | 1999 | [7] |
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