UT 1 - Amis des Sciences

Le Very large télescope
des défis techniques et des résultats astronomiques
Friday, March 15, 2013

Presentation
•Jean-Baptiste Le Bouquin
•33 ans (= jeune chercheur)
•Astronome Adjoint - OSUG / UJF
•These en 2006 à Grenoble
•CDD au Chili de 2006 - 2010
Friday, March 15, 2013

Presentation
Sujets de recherche: Techniques d’observations, Physique stellaire.
Méthodes de recherche: Instrumentation, Observations
3
UT1 UT2 UT3 UT4
VLTI ELT
108 December 2010 Physics Today www.physicstoday.org
A PIONIERing interferometer
In a grand display of astrophotonics, the light from four telescopes
at the Very Large Telescope Interferometer (VLTI) in Chile was com-
bined in late October for the first time, by the Precision Integrated-
Optics Near-infrared Imaging ExpeRiment (PIONIER). The visiting
instrument, developed at the Laboratoire d’Astrophysique de
Grenoble (LAOG) in France, complements the two existing VLTI
instruments that combine light from two and three telescopes.
Before even reaching PIONIER, the light paths from the four
1.8-meter auxiliary telescopes at the VLTI had to be controlled to
less than a micron. Each of PIONIER’s four alignment units, seen
above in the foreground, focuses one of the incoming VLTI beams
into an optical fiber. The fibers channel the light into the heart of
the instrument: an integrated optics beam combiner, developed at
LETI, a French Atomic Energy Commission laboratory, in collabora-
tion with LAOG. Housed under the folded metal cover to the left of the alignment units, the combiner, smaller than a credit card,
interferes each beam with all the others (see the inset). The 24 combiner outputs are then focused onto a detector in the brass
cryostat.
The interference output of PIONIER will have the resolving power of a virtual telescope some 100 meters across. The first images
are anticipated in early 2011. Among the topics that PIONIER will study are protoplanetary and debris disks, hot Jupiters, and stellar
surfaces. (Photo courtesy of Bernard Lazareff/LAOG/OSUG/UJF/CNRS and the European Southern Observatory; inset courtesy of
LAOG/UJF and CEA/LETI, photo © CNRS Photothèque/Emmanuel Perrin.)
To submit candidate images for Back Scatter, visit http://www.physicstoday.org/backscatter.html.
8cm
le Very Large Telescope Interferometer
L’instrument
PIONIER
Le composant d’optique
intégrée IONIC - 4T
2010−10−28
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−5
0
5
2010−12−07
−5 0 5
2010−12−22
A star
M giant
Solar system
m v earth m
Sun
−5 0 5
Image interferometrique
HRA de la binaire
symbiotique SS Lep
Friday, March 15, 2013

Un peu d’histoire... et
de technique
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Friday, March 15, 2013

Quelques télescopes historiques...
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2.5m Hooker telescope, Mt. Wilson, California
5 meter Hale telescope, Mt. Palomar
Friday, March 15, 2013