March 21, 2006 SONG workshop 1/27 SIAMOIS Sismomètre Interferentiel A Mesurer les Oscillations des Intérieurs Stellaires An asteroseismic network with 1 site... in Antarctica Benoît Mosser, Tristan Buey, Claude Catala Michel Auvergne, Thierry Appourchaux, Annie Baglin, Caroline Barban, François Bouchy, Stéphane Charpinet, Marc-Antoine Dupret, Marie-Jo Goupil, Jean-Pierre Maillard, Eric Michel, Reza Samadi, François-Xavier Schmider, Frédéric Thévenin, Gérard Vauclair et al. Observatoire de Paris/LESIA, IAP, IAS, UNSA/LUAN, OMP/LATT, OCA
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March 21, 2006SONG workshop1/27 SIAMOIS Sismomètre Interferentiel A Mesurer les Oscillations des Intérieurs Stellaires An asteroseismic network with 1.
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March 21, 2006 SONG workshop 1/27
SIAMOIS Sismomètre Interferentiel A Mesurer les Oscillations des Intérieurs Stellaires
An asteroseismic network with 1 site... in Antarctica
Benoît Mosser, Tristan Buey, Claude Catala Michel Auvergne, Thierry Appourchaux, Annie Baglin, Caroline Barban, François Bouchy,
Stéphane Charpinet, Marc-Antoine Dupret, Marie-Jo Goupil, Jean-Pierre Maillard, Eric Michel, Reza Samadi, François-Xavier Schmider, Frédéric Thévenin, Gérard Vauclair et al.
Observatoire de Paris/LESIA, IAP, IAS, UNSA/LUAN, OMP/LATT, OCA
March 21, 2006 SONG workshop 2/27
SUMMARY
• Which program in asterosismology after COROT ?
• Dome C in Antarctica
• SIAMOIS: principle
• SIAMOIS: performances (/ SONG)
• Project: organisation, science
March 21, 2006 SONG workshop 3/27
Ground-based observations, 2006
Ground-based asteroseismic observations remain limited by the window effect
March 21, 2006 SONG workshop 4/27
Ground-based observations, 2006
Even with bi-sites observations
Continuous observations are required for precise structure modelling
Kjeldsen et al 2005
March 21, 2006 SONG workshop 5/27
In 2009, end of COROT
will have done a considerable work !
And after that ???
March 21, 2006 SONG workshop 6/27
Photometry / spectrometry
• Spectrometry less sensitive to granulation than photometry
• Visibility of l = 3 modes enhanced about ~ 3 times in spectometry
Small separation between modes with degrees 1 et 3
Ground-based measurements = spectrometric observationsNecessarily: continuity, long duration network or Antarctica
March 21, 2006 SONG workshop 7/27
Dome C
• Concordia station, Italy + France
75°06’ south, 123°21’ east
• Average temperatures
40°C in summer
60°C in winter• Slow wind• Rare precipitations:
2 to 10 cm snow/year
Polar night: 3 months
March 21, 2006 SONG workshop 8/27
Duty cycle > 90 %during 3 months in winter (K. Agabi)
March 21, 2006 SONG workshop 9/27
(First) observations at Dome C
Specifications for observations at Dome C
• integrated project- has to be fully tested before installation in Antarctica- with limited setup
• small size telescope- pioneering project
• project has to be fully automatic, ~ spatial condition- human intervention limited to routine, or survival - mass, power, telemetry: limited values
• scientific programme has to be- ambitious- unfeasible elsewhere- to make sense after COROT
March 21, 2006 SONG workshop 10/27
Observations at Dome C
-1- dedicated asteroseismometerwith a small size telescopefirst wintering in 2010
-2- 2-m class telescope + spectropolarimeter
• IPEV (Institut Paul-Emile Victor)- in charge of the Concordia base; wintering since 2005- supervises scientific projects
• INSU (National Institute for Astronomy)/ Antarctic group- promotes observations at Dome C- has to identify pioneering projects in astronomy
• PNPS (National programme for stellar physics)- promotes the rapid development of an asteroseismometer at Dome C
March 21, 2006 SONG workshop 11/27
• Principle (Bouchy et al. 2001): photon noise limited performances
• An asteroseismometer has to be extremely stable and efficient
- quality factor Q - number of photoelectrons Ne
• Q depends on:- the spectral type and rotation of the star- the instrument