Title page for 952409004


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Student Number 952409004
Author Jen-Hung Wang(LE)
Author's Email Address andrew@asiaa.sinica.edu.tw
Statistics This thesis had been viewed 1405 times. Download 385 times.
Department Graduate Institute of Astronomy
Year 2008
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language English
Title Searching for TNOs and Sedna-like Objects with TAOS and Pan-STARRS Projects
Date of Defense 2009-03-06
Page Count 129
Keyword
  • solar system
  • Abstract This thesis is the study of searching for outer Solar System objects (from 50 to 1000~AU) by methods of stellar occultation. In the first part, I present the results of a search for occultation events by objects at distances between 100 and 1000~AU in lightcurves from the Taiwanese-American Occultation Survey (TAOS). We utilize an algorithm capable of detecting consecutive, shallow flux reductions in the stellar lightcurvesobtained by our survey between 7 February 2005 and 31 December 2006 with a total of $sim$$4.5imes10^{9}$ three-telescope simultaneous photometric measurements. No events were detected, allowing us to set upper limits on the number density as a function of size and distance of objects in Sedna-like orbits, using simple models.
    In the second part, I present a pre-survey study of using Pan-STARRS 30~Hz video mode guide star images to search for TNOs near 50~AU. With careful selection of the guide stars in the Pan-STARRS 7 $m deg^{2}$ field of view, the light curves of these guide stars can be used to search for diffraction patterns by occultation of TNOs.
    In principle, stars with higher signal to noise ratio and smaller angular size are best for our purpose. A detection method is outlined that can search for local fluctuation due to occultation events in the light curves. The detection threshold is set to compromise between real detection and false positive. Depending on the theoretical model been used, we expect to find up emph{a few hundred events} (upper limit set by TAOS survey) during 3 years life time of the Pan-STARRS survey. The high cadence of the survey facilitates detections of small objects (as small as 400m) and thus allows us to verify various models and further constrain our understanding of the structure in the outer reach of the Solar System.
    Table of Content Chinese Abstract i
    English Abstract iii
    Table of Contents v
    List of Figures vii
    List of Tables ix
    List of Symbols x
    1 Introduction 1
    1.1 The Formation of the Outer Solar System and the Origin of
    LP Comets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
    2 Searching for Ob jects on Sedna-like Orbits in TAOS Data 16
    2.1 Introduction to TAOS . . . . . . . . . . . . . . . . . . . . . . 17
    2.1.1 My Involvement with the TAOS Pro ject . . . . . . . . 18
    2.2 Diffraction Effect and Simulation . . . . . . . . . . . . . . . . 21
    2.3 Detection Algorithm . . . . . . . . . . . . . . . . . . . . . . . 25
    2.4 Processing the TAOS Data . . . . . . . . . . . . . . . . . . . . 33
    2.5 Efficiency Test and Upper Limits on Surface Density . . . . . 36
    3 Searching for sub-km TNOs Using Pan-STARRS Video Mode
    Light Curves 43
    3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
    3.2 Pan-STARRS system . . . . . . . . . . . . . . . . . . . . . . . 48
    3.3 Diffraction Profiles of an Object Smaller than the Fresnel Scale 51
    3.4 Detection Method . . . . . . . . . . . . . . . . . . . . . . . . . 58
    3.5 Predicted Event Rate . . . . . . . . . . . . . . . . . . . . . . . 66
    3.6 Estimate of the Stellar Angular Size . . . . . . . . . . . . . . . 71
    4 Conclusion and Future Work 83
    4.1 TAOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
    4.2 Pan-STARRS . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
    A Proof of continuous F distribution 95
    B Effective Solid Angle 98
    C The Taiwanese-American Occultation Survey: The Multi-
    Telescope Robotic Observatory 101
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    Advisor
  • Wen-Ping Chen()
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    Date of Submission 2009-04-15

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