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Hypertelescopes and exo-planetary coronagraphy Antoine Labeyrie Coll ge de France LISE

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Hypertelescopes and exo-planetary coronagraphy Antoine Labeyrie Coll ge de France LISE

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    1. Hypertelescopes and exo-planetary coronagraphy Antoine Labeyrie ( Collège de France & LISE)

    2. Detecting auroral activity on exo-Jupiters Visible, UV: narrow emission lines detectable ? with un-resolved interferometry ( 100m hypertelescope) With resolved interferometry ( 100 km hypertelescope “Exo-Earth Imager”) Radio: hypertelescope imaging and coronagraphy also applicable, in space

    3. Towards an Exo-Earth Imager : 100 km hypertelescope with coronagraph. Goals: resolved image of an Earth at 3 pc in 30 mn, search colored spots of photosynthetic life, free-flyer ’s array : 150 km size, 150 3 m mirrors.

    4. What ’s a hypertelescope ? A multi-element imaging interferometric array. Uses densified-pupil imaging to provide direct images. Usable for coronagraphy at focus.

    5. Densify the pupil, but preserve the apertures pattern. Principle of the hypertelescope (Labeyrie A&A, 1996)

    6. Optical scheme: on-axis source

    7. Optical scheme: off-axis source

    8. Field of a periodic & fully densified hypertelescope:

    9. Hypertelescope with coronagraph Coronagraph fits like on conventional telescope The densified exit pupil behaves like a classical pupil

    10. Hypertelescope proposed for DARWIN and TPF (Boccaletti et al., Icarus, May 2000)

    11. hypertelescope element (artist concept by Boeing/SVS)

    12. Hypertelescope proposed for DARWIN and TPF: focal combiner and densifier

    13. Removing coronagraphic residues

    14. Multi-stage stellar coronagraphy for detecting planets in the visible Residual stellar speckles phased ( analyzer not shown) Interference peak in the far field, masked Cleaned relayed image of planet(s) Cascadable until few stellar photons left

    15. Feasibility of a “Neutron Star Imager” Size: 105 - 106 kilometers to resolve the 20 km source. 8-meter mirrors, and combiner of similar size, for diffractive matching. Paraboloïdal primary locus, for manageable combiner size. Internal laser metrology + global pointing for image acquisition in HOF ( 10 mas) and ZOF (nanoseconds) Many photons/resel/s on Crab pulsar, but too few on ordinary stars.

    16. Coronagraphy of binary star within l/d

    17. Mosaïc of high resolution images coro 1 résidue : ghost image of star in each image multiple channels of two-stage coronography

    18. Ground versions: hypertelescope image at VLTI Off axis example

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