[giaban]0.000 VNĐ[/giaban] [kythuat]
[/kythuat]
[tomtat]
[tomtat]
A new era of observational capability at Ritter Observatory - spectropolarimetry from exoplanets to circumstellar disks and beyond
Contents
Abstract
Acknowledgments
Contents
List of Tables
List of Figures
List of Abbreviations
1 Introduction
1.1 Background on Polarization
1.2 Solar System Polarization
1.3 Polarization of Unresolved stars
1.4 Polarization of Circumstellar Material .
1.5 Polarization of Exoplanet Systems
1.5.1 Scattered Light from an Exoplanet Atmosphere
1.5.2 Using Exoplanets to Probe Limb Polarization of Host Stars
1.5.3 Starspots as a Source of Variable Polarization
2 The HPOL Spectropolarimeter
2.1 History of the Instrument
2.2 Description of the Instrument
2.2.1 Arc and Flat Lamp Assembly
2.2.2 Polarizing Prism
2.2.3 Slit & Decker Assembly
2.2.4 Filters
2.2.5 Halfwave Plate
2.2.6 Cylindrical Lens
2.2.7 Wollaston Prism
2.2.8 Gratings
2.2.9 Camera
2.2.10 Detector
2.3 The End of the PBO Era
3 Restoration & Relocation
3.1 Restoring HPOL to Operation
3.1.1 Control System Software Restoration
3.1.2 Slit Camera Replacements
3.2 Relocation to Ritter Observatory
3.3 New Layout of Equipment
4 Ritter Observatory
4.1 Telescope Collimation
4.1.1 Optical Aberrations
4.1.1.1 Spherical
4.1.1.2 Coma
4.1.1.3 Astigmatism
4.1.2 Two Mirror Mis-alignments
4.1.3 Collimating the Ritter Observatory 1-meter Telescope
4.1.4 Development of a New Collimation Procedure
4.1.4.1 Optical Table Assembly
4.1.4.2 Defining the Telescope Optical Axis
4.1.4.3 Setting the Rotation of the Secondary Mirror Ring .
4.1.4.4 Aligning the Secondary Mirror Housing Assembly and Spider with the Telescope Optical Axis .
4.1.4.5 Adjusting the Tilt of the Secondary Mirrors
4.1.4.6 Adjusting the Tilt of the Primary Mirror
4.1.4.7 Final Adjustments On-Sky
4.1.5 Installing Monofilament Crosshairs
4.1.6 Identification and Solution to a Flexure Issue in Secondary Mirror Assembly
4.1.7 Extender for HPOL
4.2 Summary of Telescope Collimation
5 Polarization Calibration
5.1 Observing Unpolarized Stars
5.2 Constructing a Calibration File
5.3 The Final Calibration File
5.4 Comparison With 10 Years of Previous PBO Calibration Work
6 Polarimetric Observations of the Exoplanet System HD189733
6.1 Observations
6.2 Data Reduction
6.3 Results
6.4 Higher Than Expected Signal
6.5 Conclusions
7 Future Work
7.1 Calibration Improvements
7.1.1 Evaluation of-Cas as an Unpol Standard
7.1.2 Cutting Polarization Observations at 3200°A
7.2 Bringing Faint-Mode Back Online
7.3 The HD189733 System
7.4 Long Term Monitoring Programs
7.5 Conclusions
ReferencesBài viết liên quan
