eso, 27 nov 09 sphere – the high contrast challenge markus kasper, eso 1 1
TRANSCRIPT
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ESO, 27 Nov 09
SPHERE – the high contrast challengeSPHERE – the high contrast challenge
Markus Kasper, ESOMarkus Kasper, ESO
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ESO, 27 Nov 09
Outline
SPHERE project history The mission The concept Demonstrations Now and soon
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ESO, 27 Nov 09
From the start…
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2 Phase A studies led by MPIA and LAOG: 2003 –2004
Phase A review Dec 2004 Major Merger: 2005 – 2006
(consortium agreement issue 1, Dec 2006)
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ESO, 27 Nov 09
SPHERE project structure
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VLT 2nd generation instrument for Exoplanets
Consortium: LAOG, LAM, LESIA, LUAN, MPIA, Padova University, Obs. Geneve, ETH Zuerich, ASTRON and ONERA
Passed FDR in Dec 2008, now in MAIT phase
Many critical components (DM+driver, WFS CCD, IR detectors, large common path optics) already in house
Commissioning and 1st light in summer 2011, in less than 2 years!!
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ESO, 27 Nov 09
Possible exoplanets, directly imaged
55HR 8799, Marois et al 2008Lagrange et al. 2009
GJ 758, Thalmann et al 2009
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ESO, 27 Nov 09
Science objectives
Radial Velocity
Large Surveys
HC & HAR Imaging
μ Lensing
Transits
Stars - BDsStars - BDs
BDs - PlanetsBDs - Planets
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ESO, 27 Nov 09
SPHERE features High contrast detection capability
Contrast Gain up to 5 mag wrt current instrumentation (10-6-10-7) Extreme AO (SR ~ 90% in H-band) Coronagraphy at small inner working angles: 0.1 – 3 Spectral Differential imaging (IRDIS, IFS) Polarimetric Differential imaging (ZIMPOL)
Characterization Polarimetry (IRDIS, ZIMPOL) Medium resolution Long-Slit spectroscopy
(R~500 in range 0.95 – 2.32 microns, IRDIS) Low resolution spectroscopy (R~50, IFS, IRDIS)
Classical imaging at high Strehl ratios (IRDIS, ZIMPOL)
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ESO, 27 Nov 09
The concept
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ESO, 27 Nov 09
40x40 SH-WFS in visible1.2 KHz, RON < 1e-
ALC, 4QPMs, Lyot, SlitsIR –TT sensor
λ = 0.5 – 0.9 µm - FoV = 3.5”
0.95 – 1.65 µm FoV = 1.77”
0.95 – 2.32 µm - FoV = 12.5’’
Nasmyth platform, static bench, Temperature control, cleanliness control Active vibration control
Concept overview
Beam control DM, TTs
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ESO, 27 Nov 09
SPHERE implementation
CPICPI
IRDISIRDISIFSIFS
ZIMPOLZIMPOL
ITTMITTM
PTTMPTTM
DMDM
DTTPDTTP
DTTSDTTS
WFSWFS
De-rotatorDe-rotator
VIS ADCVIS ADCNIR ADCNIR ADC
NIR coronoNIR corono
VIS coronoVIS corono
HWP2HWP2
HWP1HWP1
Polar CalPolar Cal
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ESO, 27 Nov 09
Spectral Differential Imaging (SDI)
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Lenzen paper
NACO, Close et al. 2003
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ESO, 27 Nov 09
Angular Differential Imaging (ADI)
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NACO at Nasmyth of VLT (Alt-Az)-> pupil and field rotate at different speeds
Standard: Rotate NACO to stabilize field PANew option: Rotate NACO to stabilize pupil (and diffraction pattern and quasi-static speckles)
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ESO, 27 Nov 09
Instrument modes
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ESO, 27 Nov 09
IRDIS / IFS performances
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ESO, 27 Nov 09
ZIMPOL performance
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ESO, 27 Nov 09
Predicted Science Output
MC simulations (MESS, Bonavita et al.) Modeled planet population or extrapolated RV
distribution Model planet brightness (thermal, reflected,
albedo, phase angle,…) Match statistics with RV results
1616Young stars (<5 108 yrs)Nearby stars (<20 pc)
Mordasini et al. (2009)
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ESO, 27 Nov 09
Science objectives
Radial Velocity
Large Surveys
HC & HAR Imaging
μ Lensing
Transits
Stars - BDsStars - BDs
BDs - PlanetsBDs - Planets
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ESO, 27 Nov 09
XAO with HOT Developed at ESO in collaboration with Arcetri and Durham Univ. H-band Strehl ratios ~90% in 0.5 seeing (SPIE 2008, Esposito et al.
& Aller-Carpentier et al. ) correcting 8-m aperture for ~600 modes
2 4 6 8 10 1250
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60
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90
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Star magnitude
SR
(%
)
Aller-Carpentier, proc. AO4ELT
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ESO, 27 Nov 09
XAO coronagraphy with HOT
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Good agreement with SPHERE simulations
Martinez et al., submitted to A&AL
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ESO, 27 Nov 09
CP bench aka piano
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ESO, 27 Nov 09
CP dampers
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ESO, 27 Nov 09
CP mounts and stages
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ESO, 27 Nov 09
Toric mirrors All toric finished TM1&TM2 in specs New TM3 started
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ESO, 27 Nov 09
Cabinets and cooling systems
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ESO, 27 Nov 09
Calibration sources
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ESO, 27 Nov 09
CODE/HODM testing
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ESO, 27 Nov 09
WFS
ASTRON, 16/17 Nov ASTRON, 16/17 Nov 200920092727
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ESO, 27 Nov 09
OCAM with LA
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ESO, 27 Nov 09
IFS
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ESO, 27 Nov 09
Opto - mechanics Layout
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ESO, 27 Nov 09
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ESO, 27 Nov 09
IFS camera
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ESO, 27 Nov 09
IRDIS status: MFG Progress
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ESO, 27 Nov 09
ZIMPOL
Mark Downing (ESO), Peter Steiner (ETH) and Charlotte installing eng.detector system
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ESO, 27 Nov 09
ZIMPOL, 1st light
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ESO, 27 Nov 09
Project Schedule
started in May 2001
Phase-A, Consortium selection, PDR…
December 2008: Final Design ReviewJan.-Dec. 2009: Procurement / ManufacturingOct. 2009 – June 2010: Sub-systems AITJuly 2010 – February 2011: Global system AITFeb.-March 2011: Preliminary Acceptance EuropeMay-End 2011: CommissioningEarly 2012: Beginning of science operation
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ESO, 27 Nov 09 3737
Review Passed
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