Slide 1

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

Slide 2

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

Slide 3

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

Slide 4

High Time Resolution Astrophysics-London 12/04/2013

Slide 5

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

Slide 6

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

Slide 7

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

Slide 8

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

Slide 9

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

Slide 10

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

Slide 11

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

Slide 12

High Time Resolution Astrophysics-London 12/04/2013 UltrPhot, a high speed photometric mode on VLT2 field : 25 diameter 60-80 fibres fast camera (100 Hz) A Fast Multi-Object Photometer : UltraPhot

Slide 13

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

Slide 14

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

Slide 15

High Time Resolution Astrophysics-London 12/04/2013 Franoise Roques, Bruno Sicardy, Thomas Widemann Alain Doressoundiram, Frederic Dauny, Paul Felenbok, Andre 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) Franois Colas, Jean Lecacheux (Institut de Mcanique Cleste et de Calcul des Ephmrides, Observatoire de Paris) Beyond Neptune

Slide 16

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

Slide 17

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

Slide 18

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

Slide 19

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

Slide 20

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

Slide 21

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

Slide 22

High Time Resolution Astrophysics-London 12/04/2013 Spatial data : Liu et al., in preparation Corot data 144000 hours Images dt = 1sec 13 events : 0,5 1,5 km see Poster

Slide 23

High Time Resolution Astrophysics-London 12/04/2013 Spatial data : RXTE/VGA data Chang et al. 2011 70 hours Flux dt = 0.001 sec 1 event : 0,1km