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 BELT OORT CLOUD
High Time Resolution Astrophysics-London 12/04/2013
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)
High Time Resolution Astrophysics-London 12/04/2013
Schlichting et al., 2009
Liu et al. in preparation
Liu et al. in preparation
Structure of the Kuiper Belt
High Time Resolution Astrophysics-London 12/04/2013
Schlichting et al., in preparation Liu et al. in preparation
Structure of the Kuiper Belt
High Time Resolution Astrophysics-London 12/04/2013
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
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 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…
High Time Resolution Astrophysics-London 12/04/2013
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
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
• 60-80 fibres • fast camera (100 Hz)
A Fast Multi-Object Photometer : UltraPhot
High Time Resolution Astrophysics-London 12/04/2013
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
High Time Resolution Astrophysics-London 12/04/2013
Thank you,
High Time Resolution Astrophysics-London 12/04/2013
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
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 secondsdepth = 7%stars separation : 79’’
High Time Resolution Astrophysics-London 12/04/2013
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
High Time Resolution Astrophysics-London 12/04/2013
Spatial data :
Liu et al., in preparation
Corot data144000 hours
Imagesdt = 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. 2011
70 hoursFlux
dt = 0.001 sec
1 event :0,1km
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