the nearby supernovae factory: monitoring spectrograph calibration lamp ben dilday advisor: rick...
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The Nearby Supernovae Factory: Monitoring Spectrograph
Calibration LampBen Dilday
Advisor: Rick Kessler, CfCPPhysics 335
March 10, 2004
Project Overview
• SNFactory– Observe low-Z Type Ia supernovae– Correlate intrinsic brightness with light
curve characteristics– Reduce statistical error in cosmological
parameters
Project Overview
• Calibration– Blackbody emission source (lamp at
T~3000K) calibrates spectrograph
• University of Chicago CfCP Role– instrumentation to confirm stability of
blackbody source– Measure red-blue ratio
Physics 335 Project Objectives
• Hardware– Construct casing for pin diodes– Remotely controlled roof
• Opens to allow light onto PIN diodes• Closes to protect from environment
– Instrument installation
• Software– Stepper motor (roof) interface– Analysis
Physics 335 Objectives
• Casing for pin diodes
COMPLETED
16 1/2” x 15 1/2” x 10 1/4”
1/4” garolite on 1/2” aluminum base
1/32” garolite roof on 1/8” garolite frame
Physics 335 Objectives
1.8 degree stepper motor
- interfaced via AllMotion EZHR23 stepper motor controller
Previous controller: EZ17
- coarse step resolution
- inadequate
• Remotely controlled roof
Physics 335 Objectives
• Stepper motor (roof) interface
COMPLETED
Allows remote operation and status checks
Physics 335 Objectives• Instrument Installation
Mauna Kea Observatories, Hawaiihttp://www.ifa.hawaii.edu/mko/maunakea.htm
INSTALLATION SCHEDULE
March 22nd – Hilo
Reassemble instrument
March 29th – Mauna Kea
Install on UH 2.2 meter
Physics 335 Objectives• Analysis of PIN diode data
SOFTWARE
In progress
SN OBSERVATIONS
~Late Spring ?
http://harris.roe.ac.uk/~jkd/startrails.htmlGemini, the UH88 inch and UKIRT
Conclusion & Project Outlook• Casing with Roof
– COMPLETE
• Stepper motor (Remote Operation)– COMPLETE
• Installation– Scheduled for end of March
• Analysis– PIN diode analysis software likely finished by late
April– Application of PIN diode data
• Techniques not certain until experiments can be carried out