exploration of the outer solar system : serendipitous occultations françoise roques

High Time Resolution Astrophysics-London 12/04/2013

Exploration of the Outer Solar System : Serendipitous Occultations

Françoise Roques(Observatoire de Paris)


Beyond Neptune

200 meters TNO at 40AU

A 10 km comet at 5000 AU


Beyond Neptune :an invisible world

KUIPER BELT OORT CLOUD


Ground-based research TAOS : T:0,5m + camera 10 Hz + 1000 stars (4 years) (Bianco et al. 2009)

Ultracam : T:4-8m + camera 60Hz + 2 stars (100h) (Doressoundiram et al. 2012)

Bickerton : T:2m + camera 40Hz + 2 stars (10h) (Bickerton et al. 2008)

MMT :T4m+camera 10Hz+1000 stars (10h) (Bianco et al., 2009)

PanStarr guiding camera : in prog. (Wang et al., 2010)

Miosotys : T2m + camera 20Hz + 29 stars (2000h) : in prog (HTRA poster)

UltraPhot : project of F-MOP instrument (Doressoundiram et al. 2013)

Spatial research HST guiding camera +40Hz (10 years) (Schlichting et al., 2009, 2012)

RXTE Sco X-1(100h) (Chang et al. 2006, 2010)

Corot sismology data (144 kh) :in prog. (HTRA poster)

Whipple : project of NASA dedicated mission (Nihei etal. 2009)


Schlichting et al., 2009

Liu et al. in preparation

Liu et al. in preparation

Structure of the Kuiper Belt


Schlichting et al., in preparation Liu et al. in preparation

Structure of the Kuiper Belt


Kuiper Belt occultation rate

N(radius>250m) = 107 deg-2

dt = 0.1 second => frequency > 20Hzdp = 20% => SNR > 100.f-1/2

occultations rate per star : 2500-1 hours

=>Several target stars and long runs


Oort Cloud exploration :Choice of target stars

Target stars must be bright and very small :

only 100 stars.deg-2


Fast Multi Object PhotometerF-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…


see poster session

29 image fibres10 Hz

MEFOS, a 29 fibers spectrograph has been upgraded and and mounted on the 1.93m telescope of the OHP


dt = 0.05 second

A flash star?


UltrPhot, a high speed photometric mode on VLT2• field : 25’ diameter

• 60-80 fibres • fast camera (100 Hz)

A Fast Multi-Object Photometer : UltraPhot


Fast Multi Object PhotometerF-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


Thank you,


Françoise Roques, Bruno Sicardy, Thomas WidemannAlain 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


UltraCam data

UltraPhot - aperture size

maximum diameter = 4.3’’


UltraPhot - CCD


UltraPhot - camera


Two approachs

Size ?Shape ?Atmosphere ?Satellites ?

size distribution?disk mass ?spatiale distribution ?


Seeing mimics occultation events

VLT/Ultracam : g’-r’ filters - f=65Hz

dt=0.9 secondsdepth = 7%stars separation : 79’’


Ground-based data :

Doressoundiram et al., in preparation

Miosotys3780 hours

Imagesdt = 0.5 sec

1-10 events :0,3 – 1 km

Data under analysissee Poster


Spatial data :

Liu et al., in preparation

Corot data144000 hours

Imagesdt = 1sec

13 events :0,5 – 1,5 km

see Poster


Spatial data : RXTE/VGA data

Chang et al. 2011

70 hoursFlux

dt = 0.001 sec

1 event :0,1km

exploration of the outer solar system : serendipitous occultations françoise roques

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