Ms. Roxana E. Lupu Profile

Roxana E. Lupu

researcher

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Publications (5)

Proceedings Article | 15 December 2020 Presentation + Paper

The Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) technology demonstration

N. Jeremy Kasdin, Vanessa Bailey, Bertrand Mennesson, Robert Zellem, Marie Ygouf, Jason Rhodes, Thomas Luchik, Feng Zhao, A. J. Eldorado Riggs, Byoung-Joon Seo, John Krist, Brian Kern, Hong Tang, Bijan Nemati, Tyler Groff, Neil Zimmerman, Bruce Macintosh, Margaret Turnbull, John Debes, Ewan Douglas, Roxana Lupu

Proceedings Volume 11443, 114431U (2020) https://doi.org/10.1117/12.2562997

KEYWORDS: Coronagraphy, Imaging spectroscopy, Planets, Infrared telescopes, James Webb Space Telescope, Imaging systems, Wavefronts, Algorithm development, Jupiter, Infrared radiation

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Proceedings Article | 12 September 2017 Presentation + Paper

Current science requirements and planned implementation for the WFIRST-CGI Integral Field Spectrograph (IFS)

Avi Mandell, Tyler Groff, Qian Gong, Maxime Rizzo, Roxana Lupu, Neil Zimmerman, Prabal Saxena, Michael McElwain

Proceedings Volume 10400, 1040009 (2017) https://doi.org/10.1117/12.2274711

KEYWORDS: Iterated function systems, Spectrographs, Planets, Spectral resolution, Exoplanets, Sensors, Prisms, Coronagraphy, Signal to noise ratio, Cameras

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SPIE Journal Paper | 1 September 2017

High-efficiency UV/optical/NIR detectors for large aperture telescopes and UV explorer missions: development of and field observations with delta-doped arrays

Shouleh Nikzad, April Jewell, Michael Hoenk, Todd Jones, John Hennessy, Tim Goodsall, Alexander Carver, Charles Shapiro, Samuel Cheng, Erika Hamden, Gillian Kyne, D. Christopher Martin, David Schiminovich, Paul Scowen, Kevin France, Stephan McCandliss, Roxana Lupu

JATIS, Vol. 3, Issue 03, 036002, (September 2017) https://doi.org/10.1117/12.10.1117/1.JATIS.3.3.036002

KEYWORDS: Sensors, Silicon, Charge-coupled devices, Ultraviolet radiation, Quantum efficiency, Telescopes, Space telescopes, Semiconducting wafers, Ultraviolet telescopes, Astronomical telescopes

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Proceedings Article | 15 July 2008 Paper

Calibration and flight performance of the long-slit imaging dual order spectrograph

Roxana Lupu, Stephan McCandliss, Brian Fleming, Kevin France, Paul Feldman, Shouleh Nikzad

Proceedings Volume 7011, 70113I (2008) https://doi.org/10.1117/12.786435

KEYWORDS: Microchannel plates, Charge-coupled devices, Sensors, Calibration, Telescopes, Spectrographs, Stars, Lamps, CCD image sensors, Monochromatic aberrations

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Proceedings Article | 15 July 2008 Paper

Project Lyman

Stephan McCandliss, Jeffrey Kruk, William Blair, Mary Elizabeth Kaiser, Paul Feldman, Gerhardt Meurer, William Dixon, David Sahnow, David Neufeld, Roxana Lupu, Brian Fleming, Stephen Smee, B. Andersson, Samuel Moseley, Alexander Kutyrev, Mary Li, George Sonneborn, Oswald Siegmund, John Vallerga, Barry Welsh, Massimo Stiavelli, Rogier Windhorst, Alice Shapley

Proceedings Volume 7011, 701120 (2008) https://doi.org/10.1117/12.789574

KEYWORDS: Galactic astronomy, Camera shutters, Stars, Sensors, Photons, Telescopes, Near ultraviolet, Ionization, Spectroscopy, James Webb Space Telescope

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We explore the design of a space mission called Project Lyman that has the goal of quantifying the ionization history of the universe from the present epoch to a redshift of z ~ 3. Observations from WMAP and SDSS show that before a redshift of z (Symbol not available. See manuscript.) 6 the first collapsed objects, possibly dwarf galaxies, emitted Lyman continuum (LyC) radiation shortward of 912 Å that reionized most of the universe. Theoretical estimates of the LyC escape fraction ( f_esc ) required from these objects to complete reionization is f_esc~10%. How LyC escapes from galactic environments, whether it induces positive or negative feedback on the local and global collapse of structures, and the role played by clumping, molecules, metallicity and dust are major unanswered theoretical questions, requiring observational constraint. Numerous intervening Lyman limit systems frustrate the detection of LyC from high z objects. They thin below z ~ 3 where there are reportedly a few cases of apparently very high fesc. At low z there are only controversial detections and a handful of upper limits. A wide-field multi-object spectroscopic survey with moderate spectral and spatial resolution can quantify f_esc within diverse spatially resolved galactic environments over redshifts with significant evolution in galaxy assemblage and quasar activity. It can also calibrate LyC escape against Lyα escape, providing an essential tool to JWST for probing the beginnings of reionization. We present calculations showing the evolution of the characteristic apparent magnitude of star-forming galaxy luminosity functions at 900 Å, as a function of redshift and assumed escape fraction. These calculations allow us to determine the required aperture for detecting LyC and conduct trade studies to guide technology choices and balance science return against mission cost. Finally we review our efforts to build a pathfinding dual order multi-object spectro/telescope with a (0.5°)² field-of-view, using a GSFC microshutter array, and crossed delay-line micro-channel plate detector.

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