Swiss 1.2-metre Leonhard Euler Telescope
{{Short description|Telescope in the La Silla Observatory, Chile}}
{{Infobox telescope}}
Leonhard Euler Telescope, or the Swiss EULER Telescope, is a national, fully automatic {{convert|1.2|m|in|adj=on}} reflecting telescope, built and operated by the Geneva Observatory. It is located at an altitude of {{convert|2375|m|ft|abbr=on}} at ESO's La Silla Observatory site in the Chilean Norte Chico region, about 460 kilometers north of Santiago de Chile. The telescope, which saw its first light on 12 April 1998, is named after Swiss mathematician Leonhard Paul Euler.{{cite web |url=https://www.eso.org/public/teles-instr/lasilla/swiss/ |title=Swiss 1.2-metre Leonhard Euler Telescope |work=ESO |access-date=10 September 2015}}{{cite web |url=http://exoplanets.ch/projects/euler/ |title=EULER |work=Exoplanets |publisher=Université de Genève |location=Switzerland |access-date=10 September 2015}}
The Euler telescope uses the CORALIE instrument to search for exoplanets. In addition, the telescope uses the multi-purpose EulerCam (ecam), a high precision photometry instrument, and a smaller, piggyback mounted telescope, called "Pisco". Its first discovery was a planet in orbit around Gliese 86, determined to be a hot Jupiter with an orbital period of only 15.8 earth days and about four times the mass of Jupiter. Since then, many other exoplanets have been discovered or examined in follow-up observations.
Together with the Mercator Telescope, Euler was part of the Southern Sky extrasolar Planet search Programme, which has discovered numerous extrasolar planets. It has also been frequently employed for follow-up characterization to determine the mass of exoplanets discovered by the Wide Angle Search for Planets, SuperWASP.{{cite journal | bibcode = 2010A&A...517L...1Q | title=WASP-8b: a retrograde transiting planet in a multiple system | journal=Astronomy and Astrophysics | volume=517 | year=2010 |display-authors=4 |author1=Queloz, D. |author2=Anderson, D. R. |author3=Collier Cameron, A. |author4=Gillon, M. |author5=Hebb, L. |author6=Hellier, C. |author7=Maxted, P. |author8=Pepe, F. |author9=Pollacco, D. |author10=Ségransan, D. |author11=Smalley, B. |author12=Triaud, A.H.M.J. |author13=Udry, S. |author14=West, R. | pages=L1 |arxiv = 1006.5089 |doi = 10.1051/0004-6361/201014768 | s2cid=35774603 }}
CORALIE
The CORALIE spectrograph is an echelle- type spectrograph used for astronomy. It is a copy of the ELODIE spectrograph used by Michel Mayor and Didier Queloz to detect the planet orbiting a star . In April 1998 it was built and installed at the Euler Telescope. Later in 2007 it was upgraded by Didier Queloz and his team to increase its performances to support Wide Angle Search for Planets program and Next-Generation Transit Survey. The instrument is optimized to measure Doppler effect on a star's electromagnetic spectrum with great precision to detect the gravitational tug of an exoplanet orbiting around it.{{cite journal
| title=The CORALIE survey for southern extra-solar planets. I. A planet orbiting the star Gliese 86
| last1=Queloz |first1=D.
| journal=Astronomy and Astrophysics
| volume=354
| pages= 99–102
| date=2000
| bibcode=2000A&A...354...99Q
| last2=Mayor
| first2=M.
| last3=Weber
| first3=L.
| last4=Blécha
| first4=A.
| last5=Burnet
| first5=M.
| last6=Confino
| first6=B.
| last7=Naef
| first7=D.
| last8=Pepe
| first8=F.
| last9=Santos
| first9=N.
| last10=Udry
| first10=S.
| display-authors=4
}}ESO publication, D. Queloz and M. Mayor, [https://www.eso.org/sci/publications/messenger/archive/no.105-sep01/messenger-no105-1-7.pdf From CORALIE to HARPS], September 2001 It also known as "radial velocity" or "wobble" method, is an indirect detection method. The mass of the planet can be estimated from these measurements.
The spectrograph participates in the [http://obswww.unige.ch/~udry/planet/coralie.html Southern Sky extrasolar Planet search Programme] initiated by Michel Mayor
In 2010 visible camera EulerCam was installed by Didier Queloz. Camera main objective was to measure planet by transit method by supporting ground base program such as Wide Angle Search for Planets . The size of an exoplanet can be estimated using the transit method. By combining the measured size and mass from both methods, it can be determined whether the observed exoplanet is gaseous or rocky.
= Characteristics =
The resolution of CORALIE is fixed at R = 50,000 with three-pixel sampling. The detector charge-coupled device is 2k X 2k with a 15 micrometer pixel size.
= Discovered exoplanets =
The first five planetary object discovered using CORALIE are
Gallery
File:Lso-swiss.jpg|The 1.2-meter Leonhard Euler Telescope
Image:LaSillaByNight2.jpg|Euler Telescope with the ESO 3.6-meter in the background
File:The Swiss 1.2-metre Leonhard Euler Telescope in its dome at La Silla.jpg|A fisheye view of the Euler Telescope
File:La Silla from 3,6m.jpg|La Silla with NTT in the center and Euler on the right
File:Exoplanet Hunters at La Silla.jpg|Euler and ESO 3.6-meter are both exoplanet hunters at La Silla
File:Moonlight and Zodiacal Light Over La Silla Observatory.jpg|Moonlight and Zodiacal Light Over La Silla Observatory
File:La Silla - Evening.jpg|Sunset at ESO's La Silla observatory in Chile
File:Fantastic Mr Fox.jpg|Fantastic Mr Fox
= Video =
File:La Silla Timelapse 241109.ogv
{{clear}}
See also
References
{{reflist
|refs=
{{Cite arXiv
| eprint=astro-ph/9910223
| display-authors=4
| last1=Queloz | first1=D. | last2=Mayor | first2=M. | last3=Weber | first3=L.
| last4=Blecha | first4=A. | last5=Burnet | first5=M. | last6=Confino | first6=B.
| last7=Naef | first7=D. | last8=Pepe | first8=F. | last9=Santos | first9=N.
| title=A planet orbiting the star Gliese 86
| date=1999
}}
{{cite web
|url=http://obswww.unige.ch/~udry/planet/coralie.html
|title=Southern Sky extrasolar Planet search Programme
|work=unige.ch
}}
}}
External links
{{commons category|Leonhard Euler Telescope}}
- [http://www.eso.org/public/teles-instr/lasilla/swiss.html ESO La Silla 1.2m Leonhard Euler Telescope]
- [http://obswww.unige.ch/~udry/planet/coralie.html Southern Sky extrasolar Planet search Programme]
- [http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html The CORALIE survey for southern extrasolar planets]
- [http://www.exoplanets.ch/ www.exoplanets.ch]
- [http://www.unige.ch/sciences/astro/en/ University of Geneva – The Geneva Observatory]
- [http://www.daviddarling.info/encyclopedia/L/Leonard_Euler_Telescope.html daviddarling.info /Euler]
- [http://astro.berkeley.edu/~gmarcy/hd83443/pressrelease.html ESO press release: 4 May 2000]
{{European Southern Observatory}}
{{Exoplanet search projects}}
Category:Reflecting telescopes
Category:European Southern Observatory
Category:Astronomical instruments
Category:Telescope instruments