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Trapped photoelectrons during spacecraft charging in sunlight
(Institute of Electrical and Electronics Engineers, 2015-09)
For a dielectric spacecraft charging in sunlight, the potentials are different on the sunlit and dark sides. Differential charging of spacecraft surfaces can trap low-energy electrons by means of potential wells and barriers. ...
Interplanetary space weather effects on Lunar Reconnaissance Orbiter avalanche photodiode performance.
(Space Weather: The International Journal of Research & Applications, 2016)
Space weather is a major concern for radiation-sensitive space systems, particularly for interplanetary missions, which operate outside of the protection of Earth's magnetic field. We examine and quantify the effects of ...
Planetary Imaging Concept Testbed Using a Recoverable Experiment-Coronagraph (PICTURE C)
(SPIE, 2015)
An exoplanet mission based on a high-altitude balloon is a next logical step in humanity's quest to explore Earthlike planets in Earthlike orbits orbiting Sunlike stars. The mission described here is capable of spectrally ...
Direct imaging of exoEarths embedded in clumpy debris disks
(SPIE - The International Society for Optical Engineering, 2012)
The inner solar system, where the terrestrial planets formed and evolve, is populated by small grains of dust produced by collisions of asteroids and outgassing comets. At visible and infrared wavelengths, this dust cloud ...
Combining laser frequency combs and iodine cell calibration techniques for Doppler detection of exoplanets
(SPIE - The International Society for Optical Engineering, 2010)
Exoplanets can be detected from a time series of stellar spectra by looking for small, periodic shifts in the absorption features that are consistent with Doppler shifts caused by the presence of an exoplanet, or multiple ...
Atmospheric characterization of cold exoplanets with a 1.5-m space coronagraph
(Amsterdam Netherlands: SPIE - The International Society for Optical Engineering, 2012)
Several small space coronagraphs have been proposed to characterize cold exoplanets in reflected light. Studies have mainly focused on technical feasibility because of the huge star/planet flux ratio to achieve in the ...
CubeSat deformable mirror demonstration
(SPIE - The International Society for Optical Engineering, 2012)
The goal of the CubeSat Deformable Mirror Demonstration (DeMi) is to characterize the performance of a small deformable mirror over a year in low-Earth orbit. Small form factor deformable mirrors are a key technology needed ...
Effect of Longitude-Dependent Cloud Coverage on Exoplanet Visible Wavelength Reflected-Light Phase Curves
(IOP Publishing, 2015-05-10)
We use a planetary albedo model to investigate variations in visible wavelength phase curves of exoplanets. Thermal and cloud properties for these exoplanets are derived using one-dimensional radiative-convective and cloud ...