siamois sismomètre interférentiel a mesurer les oscillations des intérieurs stellaires
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June 15, 2006 ARENA workshop 1
SIAMOIS Sismomètre Interférentiel A Mesurer les Oscillations des Intérieurs Stellaires
Seismic Interferometer to Measure Oscillations in the Interior of Stars
Benoît Mosser, Tristan Buey, Claude Catala, Michel Auvergne, Thierry Appourchaux, Annie Baglin, Caroline Barban, Marc-Antoine Dupret, MarieJo Goupil, Jean-Pierre Maillard, Eric Michel, Reza Samadi,
Francois-Xavier Schmider, Frédéric Thévenin, Gérard Vauclair, Denis Fappani et al. Observatoire de Paris/LESIA, IAS, UNSA/LUAN, OMP/LATT, IAP, OCA
June 15, 2006 ARENA workshop 2
Asteroseismology
The Sun without asteroseismic constraints !
What asteroseismology teaches us ? …. Example of the Sun
June 15, 2006 ARENA workshop 3
Asteroseismology
The Sun without asteroseismic constraints !
What asteroseismology teaches us ? …. Example of the Sun
June 15, 2006 ARENA workshop 4
Asteroseismology after COROT
1st step: photometry, space-based observations2nd step : spectrometry, ground-based obs.
Complementary observations • Bright stars• Low mass stars• Doppler signalreduced granulation noise, modes l=3
Scientific specifications: continuous observations, long duration
June 15, 2006 ARENA workshop 5
SIAMOIS at Dome C
Demanding site ? Project ~ spatial organization
Quasi automatic, simple setup
Reduced mass, power, telemetry
Seeing ? Fibre = 5" on the sky
No big telescope available at Dome C ?
Key science with a 40-cm telescope
Only circumpolar targets ? Enough interesting bright targets for more than 6 winterings
Duty cycle ~ 90% ! Scientific specification #1 : duty cycle > 85%
Polar night = 3 months Scientific specification #2 : 100-day long run on the same target
June 15, 2006 ARENA workshop 6
Scientific program
Observable targets with SIAMOIS and a
40-cm telescope dedicated to the
project
• 40-cm telescope:- 7 targets, type: F, G, K class: IV & V
- many red giants; Scuti (v sin i < 20 km/s)
Scientific programme for more than 6 winterings
COROT
June 15, 2006 ARENA workshop 7
Overall description
• Divided in four sub-systems :
– A dedicated Telescope with its Bonnette (telescope guiding and fiber coupling).
– An Interferometer and a Camera.
– A structure for thermal and mechanical control.
– A command/control software system.
• Divided in five laboratories :
– GIGT from OMP (Observatoire Midi-Pyrennée).
– LUAN from OCA (Observatoire Côte d’Azur).
– IAS (Institut d’Astrophysique Spatiale).
– LESIA from OPM (Observatoire Paris-Meudon).
– CSIC from Institutode Astrofisica de Andalusia (in discussion).
• One associated private contractor :
– SESO (Société Européenne de Systèmes Optiques).
June 15, 2006 ARENA workshop 8
Instrument
Thermo-mechanical structure.
Optical bench.
Interferometer
Camera
Dedicated Telescope
Bonnette
Calibration
Optical fibers : signal and calibration
Command/control system: Acquisition,image processing …
Vacuum pump
June 15, 2006 ARENA workshop 9
Instrument
• 40-cm telescope low cost, easy ‘antarctization’, dedicated to the projet • Interferometer monolithic instrument
no moving part, reduced sizefiber fed
• Post-dispersion efficiency, photon noise limited performances
June 15, 2006 ARENA workshop 10
The constraints.
• Small budget and short planning…
• High reability of the instrument :
– Observation requirements : 90% of duty cycle.
– Very difficult to fix anything at Dome C in Antarctica.
• Very easy to use :
– Not easy set-up at Dome C in Antarctica (once again :-) ).
– Wintering will insure a minimal maintenance.
• Rather hard environmental conditions :
– Shocks and temperature (level and gradient) during transportation and storage.
– Temperature, humidity and pressure during operation.
June 15, 2006 ARENA workshop 11
Planning
• 2004- design- Achievement of the feasibility phase.
• 2006- thermo-mechanical analysis - Qualification tests.
• 2007- PDR- FDR
• 2008- integration
• 2009- tests- summer campaign: Dome C
• 2010
- first winterover at Dome C
Laboratories: LESIA (Obs. Paris), IAS (Orsay), LUAN (Nice), LATT (Toulouse) + SESO
SIAMOIS InterferometerJP Amans, GEPI, Obs Paris
Coast : 860 k€Including ANR : 460 k€
For phase A in 2006(ACI + CSA + PNPS) : 116 k€
June 15, 2006 ARENA workshop 12
Development Philosophy
• Step I : Establish all the requirements of the sub-systems and the interfaces between them.
• Step II : Develop the test benches and equipments, write the invitation to tender for the industrial contractors.
• Step III : Develop the sub-systems (industries and laboratories) or buy them directly when possible (budget and specifications).
• Step IV : Individual acceptance of each sub-systems.• Step V : Environmental qualification.• Step VI : Integration of the sub-systems together up to the instrument level.• Step VII : End-to-end test in laboratory and on the sky, final setup.• Step VIII : After transportation to Dome-C, simple integrity test.
• Some revue are foreseen during the project development.• Like “space instrument” development : quality, management of
configuration, documentation, revues… with limitations!
June 15, 2006 ARENA workshop 13
• Dome C: a unique site for asterosismology3-month continuous observation with duty cycle ~ 90%
• A specific scientific program after• High performances with a 40-cm collector
– Pioneering project at Dome C– FT seismometry: suitable concept for installation and setup at Dome C– Multiplex advantage of FT spectrometry– Small instrument : < 300kg, < 2m3, < 1kW, …– Rather fast development with a demonstrate feasibility.
Conclusion
‘‘Big science’’ at Dome C with a budget < 1 M€
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