ELODIE spectrograph
ELODIE was an echelle spectrograph installed on the 1.93 m telescope of the Observatoire de Haute -Provence in southeastern France for the screening of the Northern Extrasolar Planet Search.
Its optical instrumentation was developed by André Baranne from the Observatoire de Marseille. The aim of this spectrograph was the discovery of extrasolar planets by radial velocity method. In addition ELODIE was also used for the M - Dwarf program.
Elodie's first light was gained in 1993. After 13 years, it was then placed in August 2006 out of service and replaced by the spectrograph SOPHIE however, a new instrument of the same type with improved properties, a month later in September 2006.
Properties
The electromagnetic spectrum is divided by ELODIE in the wavelength range from 389.5 nm to 681.5 nm in a single shot in 67 spectral diffraction orders. The instrument was located in a temperature-controlled room and were fed by optical fibers from the Cassegrain focus of the telescope with light.
One of the unique properties Elodie was the integrated data reduction, the immediate, extremely accurate measurement of the radial velocity of down to DELTA.v = ± 7 m / s of the investigated objects allowed by cross-correlating means of a numerical aperture.
About 34,000 spectra were obtained using ELODIE, about 20.0000 it publicly available through an online archive. The spectrograph was a product of collaboration between the Observatoire de Haute -Provence, the Geneva Observatory and the Observatoire de Marseille. A publication that described the instrument appeared in Astronomy and Astrophysics.
Planets discovered by ELODIE
The first extrasolar planet was in 1995 using this instrument to the Sun-like star 51 Pegasi b, discovered more than twenty of these planets using ELODIE. In addition to the radial velocity method could be discovered with ELODIE also by the transit method planet.
More
- List of Exoplanets
- CORALIE spectrograph was an identical instrument for screening Survey for Southern Extra -solar Planets.