Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942220n&link_type=abstract
American Astronomical Society, AAS Meeting #219, #422.20
Astronomy and Astrophysics
Astronomy
Scientific paper
The high-resolution visible and infrared spectrograph (HiVIS) is located in one of the coudé rooms of the air force's AEOS (advanced electro-optical system) telescope, which is a 3.67m telescope situated on the island of Maui. Spectropolarimetric signals are typically on the order of 0.1% of the continuum intensity. Therefore, although spectropolarimetry is a powerful remote-sensing tool, useful for the detection of processes taking place within the stellar environment, it requires a high signal to noise ratio to detect these small signatures as well as the identification of systematic noise in order to achieve the precision necessary to avoid masking polarization signatures.
HiVIS uses a new CCID20 detector with bi-directional clocking and charge shuffling capabilities and liquid crystal variable retarders for the purpose of modulating an incoming polarization signature. We present a characterization of the CCID20 detector and the LCVRs, revealing trade-offs and limitations of the rapid modulation process. The preliminary results show that within the range of parameters we expect for observations, the detector is not a major limitation. The liquid crystal variable retarders show the expected correlation between more rapid modulation (increased fraction of time spent switching) and an increase in statistical noise from demodulation.
This work was conducted by a Research Experience for Undergraduates (REU) position at the University of Hawai'i's Institute for Astronomy and funded by the NSF.
Harrington Dave
Nevin Becky
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