Presentation is loading. Please wait.

Presentation is loading. Please wait.

Pierre BAUDOZ (Paris Observatory) A. Boccaletti, D. Mawet, J. Schneider, G. Tinetti, R. Galicher, C. Cavarroc J. Hough, P. Doel, D. Pinfield, C.-U. Keller,

Similar presentations


Presentation on theme: "Pierre BAUDOZ (Paris Observatory) A. Boccaletti, D. Mawet, J. Schneider, G. Tinetti, R. Galicher, C. Cavarroc J. Hough, P. Doel, D. Pinfield, C.-U. Keller,"— Presentation transcript:

1 Pierre BAUDOZ (Paris Observatory) A. Boccaletti, D. Mawet, J. Schneider, G. Tinetti, R. Galicher, C. Cavarroc J. Hough, P. Doel, D. Pinfield, C.-U. Keller, J.-L. Beuzit, S. Udry, M. Ferrari, E. Martin, F. Ménard, E. Sein, & SEE COAST Team … ULg / CSL / LESIA / LUTH / LUAN / ETH-Zurich / IAP / Obs. Geneva / U. Bern / UCL / ROE / U. Hertfords. / MSSL / SRON / Astron / U. Utrecht / LAOG / ONERA / DLR / U. Vienna / U. Nantes / U. Torino / Astrium Probing the Extrasolar Planet Diversity with SEE COAST

2 SPICA MIR: Old EGPs Direct Imaging Programs Overview Space-based Ground-based SEE COAST Vis/NIR: Old Jupiter + Super Earth Darwin/TPF-I MIR: Earth TPF-C Vis: Earth JWST NIR + MIR: Old EGPs 8m + XAO SPHERE / GPI / HiCIAO NIR : EGPs young/massive/ne arby 30/42m + XAO EPICS/ELTs NIR : EGPs intermediate Old + Super-Earth ? > HST Opportunity for Space projects In the Visible mature giants & Super-Earths 8m + OA VLT, Keck, Gemini, Subaru 4m + OA Silla, CFH

3 We already have targets !!! From radial velocity surveys :From direct imaging :

4 More targets to come We can anticipate many RV planets at longer periods (giants and tellurics) A few accessible from SPHERE/GPI/HiCIAO ( m) and JWST ( m) Motivation for exploring a different spectral range (in the visible) angular resolution AND contrast are required: A small telescope in space can be optimized for exo-planetology "Super Earth" as a sweet spot : brighter, earth-like notions apply (atmosphere, climate, variations, habitability, …) What sort of astrophysics on these planets ?

5 Explore the Diversity with SEE COAST - Spectra => Chemical composition Burrows, Sudarsky - Rayleigh scatterring => pressure, surf. reflectivity Spectroscopy

6 Explore the Diversity Spectroscopy Polarimetry - Polarization => Clouds / albedo Jupiter-like planet - Stam et al Earth-like planet - Stam et al cloud vegetation ocean A=0 A=1

7 Explore the Diversity - Spectral time variation => variation of temperature => surface properties 0.45 m 0.75 m - Polarimetric time variation => surface properties Cloud free Earth from 0.65 to 0.9 m 50° Phase angle 130° 90° Spectroscopy Polarimetry Variability

8 Which targets ? (contrast + IWA requirements) short wavelengths are optimal longer wavelengths require small IWA coronagraph (2 /D) near IR ( m) - self luminous planets - T > 800K contrast required

9 A proposal to Cosmic Vision … Submitted in 2007 to ESA Cosmic Vision Parameter Value Entrance pupil diameterD > 1.5m Angular resolution m Spectral Range 0.4 to 1.2 m Spectral ResolutionR>40 Contrast (after speckle 2 /D < Contrast (after speckle 4 /D < Orbit for 6 months visibility, high thermal stability L2 Lagrangian Hyperbolic secondary mirror 4,85 m long Parabolic primary mirror Two folding mirrors Focal plane

10 Coronagraphy: Multi 4QPM Baudoz et al. 2007, 08 laboratory planet Contrast : bandwidth 20% Multi 4QPM : Meudon N phase masks in series => Improves bandwidth as ^N Pupil Telescope FQPM # 1 FQPM # 3 FQPM # 2

11 Wavefront correction : Coherence Speckle nulling in a limited FOV with a DM (JPL)

12 Summary SEE COAST requires : High contrast : ANDsmall IWA : 2 /D SEE COAST can get : low res spectra of mature giants < 20pc (< AU) colors of a few mature Super Earths < 10pc (< AU) possibly Earths around the nearest star ( Cen) low res spectra of self luminous planets (extension to near IR) SEE COAST is : Compatible with general astrophysics (pushing to UV, wide field ?) Compatible with transit spectroscopy – additional targets (unresolved planets) & complements IR transit characterization programs Next steps in the project : refine some science cases and simulations (statistical analysis) elaborate optical design with industrial partners (Astrium) + derive tolerances technological developments in coronagraphy and wavefront control get prepared for next COSMIC VISION proposal (2010)


Download ppt "Pierre BAUDOZ (Paris Observatory) A. Boccaletti, D. Mawet, J. Schneider, G. Tinetti, R. Galicher, C. Cavarroc J. Hough, P. Doel, D. Pinfield, C.-U. Keller,"

Similar presentations


Ads by Google