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SIAMOIS Sismomètre Interférentiel A Mesurer les Oscillations des Intérieurs Stellaires

SIAMOIS Sismomètre Interférentiel A Mesurer les Oscillations des Intérieurs Stellaires Seismic Interferometer to Measure Oscillations in the Interior of Stars.

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SIAMOIS Sismomètre Interférentiel A Mesurer les Oscillations des Intérieurs Stellaires

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  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 ARENA workshop

  2. The Sun without asteroseismic constraints ! Asteroseismology What asteroseismology teaches us ? …. Example of the Sun ARENA workshop

  3. The Sun without asteroseismic constraints ! Asteroseismology What asteroseismology teaches us ? …. Example of the Sun ARENA workshop

  4. Asteroseismology after COROT 1st step: photometry, space-based observations 2nd step : spectrometry, ground-based obs. • Complementary observations • Bright stars • Low mass stars • Doppler signal • reduced granulation noise, modes l=3 Scientific specifications: continuous observations, longduration ARENA workshop

  5. SIAMOIS at Dome C ARENA workshop

  6. Scientific program Observable targets with SIAMOIS and a 40-cm telescope dedicated to the project COROT • 40-cm telescope: • - 7 targets, type: F, G, K class: IV & V - many red giants; d Scuti (v sin i < 20 km/s) • Scientific programme for more than 6 winterings 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). ARENA workshop

  8. Instrument Dedicated Telescope Bonnette Vacuum pump Thermo-mechanical structure. Optical bench. Optical fibers : signal and calibration Interferometer Camera Calibration Command/control system: Acquisition,image processing … ARENA workshop

  9. Instrument • 40-cm telescope low cost, easy ‘antarctization’, dedicated to the projet • Interferometer monolithic instrument • no moving part, reduced size • fiber fed • Post-dispersion efficiency, photon noise limited performances 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. 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 Interferometer JP Amans, GEPI, Obs Paris Coast : 860 k€ Including ANR : 460 k€ For phase A in 2006 (ACI + CSA + PNPS) : 116 k€ 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! ARENA workshop

  13. Dome C: a unique site for asterosismology 3-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 siamois ‘‘Big science’’  at Dome C with a budget < 1 M€ ARENA workshop

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