Paper 13093-127
Paper 13093-127
A standalone UV coronagraph instrument for the Habitable Worlds Observatory
17 June 2024 • 17:30 - 19:00 Japan Standard Time | Room G5, North - 1F
Abstract
The near-ultraviolet wavelength range contains a valuable Ozone absorption feature for characterizing the atmospheric composition of Earth-like exoplanets. Both the LUVOIR and HabEx decadal mission concept studies baselined instrumentation for obtaining photometry of directly imaged exoplanets down to wavelengths of 200 nm. Both of their proposed implementations present challenges: in the case of the HabEx starshade occulter, a separate spacecraft is required; in the case of a UV channel within the main coronagraph instrument, non-UV-optimized optics limit the performance. Yet, the science requirements allow the relaxation of some of the trades of a dedicated near-UV coronagraph. Here we present the preliminary design of a standalone UV coronagraph instrument for the Habitable Worlds Observatory concept based on the science requirements. We describe the trades and rationale behind the decision of separating the UV coronagraph from the main instrument and show the evaluation of several coronagraph designs in the UV. We assess the effect of polarization aberrations and describe potential UV detectors and wavefront sensing and control strategies.
Presenter
Roser Juanola-Parramon
NASA Goddard Space Flight Ctr. (United States)
Roser Juanola-Parramon received her BS and MS degrees in electrical engineering and computer science, and her MS degree in photonics from Polytechnic University of Catalonia, Spain, in 2008, and her PhD in astrophysics in 2014 from the University College London, United Kingdom. She is currently a research engineer at NASA Goddard Space Flight Center. Her research activities include modeling coronagraph instruments and corresponding wavefront sensing and control.