High Time Resolution Astrophysics-London 12/04/2013 Exploration of the Outer Solar System : Serendipitous Occultations Françoise Roques (Observatoire de Paris)

High Time Resolution Astrophysics-London 12/04/2013 Beyond Neptune 200 meters TNO at 40AU A 10 km comet at 5000 AU

High Time Resolution Astrophysics-London 12/04/2013 Beyond Neptune : an invisible world KUIPER BELTOORT CLOUD

High Time Resolution Astrophysics-London 12/04/2013

Schlichting et al., 2009 Liu et al. in preparation Structure of the Kuiper Belt

High Time Resolution Astrophysics-London 12/04/2013 Schlichting et al., in preparationLiu et al. in preparation Structure of the Kuiper Belt

High Time Resolution Astrophysics-London 12/04/2013 Kuiper Belt occultation rate

High Time Resolution Astrophysics-London 12/04/2013 Oort Cloud exploration : Choice of target stars Target stars must be bright and very small : only 100 stars.deg -2

High Time Resolution Astrophysics-London 12/04/2013 Fast Multi Object Photometer F-MOP multi-fiber instrument + large telescope + fast camera Fast simultaneous accurate (multi-color) photometry on several targets in a large field. stellar occultations, but also YSO, sdB stars, exoplanets transits (Kepler field), cataclismic variables…

High Time Resolution Astrophysics-London 12/04/2013 see poster session 29 image fibres 10 Hz MEFOS, a 29 fibers spectrograph has been upgraded and and mounted on the 1.93m telescope of the OHP

High Time Resolution Astrophysics-London 12/04/2013 dt = 0.05 second A flash star?

High Time Resolution Astrophysics-London 12/04/2013 UltrPhot, a high speed photometric mode on VLT2 field : 25’ diameter fibres fast camera (100 Hz) A Fast Multi-Object Photometer : UltraPhot

High Time Resolution Astrophysics-London 12/04/2013 Fast Multi Object Photometer F-MOP Fast simultaneous accurate (multi-color) photometry on several targets in a large field. stellar occultations, but also YSO, sdB stars, exoplanets transits (Kepler field), cataclismic variables… Search collaborations for promotion of F-MOP

High Time Resolution Astrophysics-London 12/04/2013 Thank you,

High Time Resolution Astrophysics-London 12/04/2013 Françoise Roques, Bruno Sicardy, Thomas Widemann Alain Doressoundiram, Frederic Dauny, Paul Felenbok, Andrée Fernandez, Bernard Christophe, Jean Guerin, Stephen Shih, Joe Liu, Lucie Maquet (Lesia, Observatoire de Paris) Hsiang-Kuang Chang (Institute of Astronomy National Tsing Hua University, Taiwan) François Colas, Jean Lecacheux (Institut de Mécanique Céleste et de Calcul des Ephémérides, Observatoire de Paris) Beyond Neptune

High Time Resolution Astrophysics-London 12/04/2013 UltraCam data UltraPhot - aperture size maximum diameter = 4.3 ’’

High Time Resolution Astrophysics-London 12/04/2013 UltraPhot - CCD

High Time Resolution Astrophysics-London 12/04/2013 UltraPhot - camera

High Time Resolution Astrophysics-London 12/04/2013 Two approachs Size ? Shape ? Atmosphere ? Satellites ? size distribution? disk mass ? spatiale distribution ?

High Time Resolution Astrophysics-London 12/04/2013 Seeing mimics occultation events VLT/Ultracam : g’-r’ filters - f=65Hz dt=0.9 seconds depth = 7% stars separation : 79’’

High Time Resolution Astrophysics-London 12/04/2013 Ground-based data : Doressoundiram et al., in preparation Miosotys 3780 hours Images dt = 0.5 sec 1-10 events : 0,3 – 1 km Data under analysis see Poster

High Time Resolution Astrophysics-London 12/04/2013 Spatial data : Liu et al., in preparation Corot data hours Images dt = 1sec 13 events : 0,5 – 1,5 km see Poster

High Time Resolution Astrophysics-London 12/04/2013 Spatial data : RXTE/VGA data Chang et al hours Flux dt = sec 1 event : 0,1km