UTILIZATION OF THE WAVEFRONT SENSOR AND SHORT-EXPOSURE IMAGES FOR SIMULTANEOUS ESTIMATION OF QUASI-STATIC ABERRATION AND EXOPLANET INTENSITY

Heretofore, the literature on exoplanet detection with coronagraphic telescope systems has paid little attention to the information content of short exposures and methods of utilizing the measurements of adaptive optics wavefront sensors. This paper provides a framework for the incorporation of the...

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Bibliographic Details
Published in:The Astrophysical journal 2013-04, Vol.767 (1), p.1-11
Main Author: Frazin, Richard A
Format: Article
Language:English
Subjects:
ACCURACY
Adaptive optics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BRIGHTNESS
CAMERAS
DISTANCE
Estimates
Extrasolar planets
GAUSS FUNCTION
IMAGE PROCESSING
Mathematical models
OPTICAL SYSTEMS
OPTICS
PHOTONS
Planet detection
PLANETS
ROTATION
Sensors
SIMULATION
TELESCOPES
Wave fronts
WAVE PROPAGATION
WAVELENGTHS
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Summary:Heretofore, the literature on exoplanet detection with coronagraphic telescope systems has paid little attention to the information content of short exposures and methods of utilizing the measurements of adaptive optics wavefront sensors. This paper provides a framework for the incorporation of the wavefront sensor measurements in the context of observing modes in which the science camera takes millisecond exposures. In this formulation, the wavefront sensor measurements provide a means to jointly estimate the static speckle and the planetary signal. The ability to estimate planetary intensities in as little as a few seconds has the potential to greatly improve the efficiency of exoplanet search surveys. For simplicity, the mathematical development assumes a simple optical system with an idealized Lyot coronagraph. Numerical experiments are performed with wavefront data from the AEOS Adaptive Optics System sensing at 850 nm. These experiments assume a science camera wavelength [lambda] of 1.1[mu], that the measured wave-fronts are exact, and a Gaussian approximation of shot-noise. The effects of detector read-out noise and other issues are left to future investigations.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/767/1/21