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Fast Coherent Differential Imaging for Exoplanet Imaging

Event Details

Event Dates: 

Friday, June 8, 2018 - 12:00pm

Seminar Location: 

  • JILA 10th Floor - Foothills Room

Speaker Name(s): 

Benjamin Gerard

Speaker Affiliation(s): 

University of Victoria, British Columbia
Seminar Type/Subject

Scientific Seminar Type: 

  • Astrophysics Lunch Seminar

Event Details & Abstract: 

Direct detection and detailed characterization of exoplanets using extreme adaptive optics (ExAO) is a key science goal of future extremely largetelescopes and space observatories. However, quasi-static wavefront errorswill limit the sensitivity of this endeavor. Additional limitations forground-based telescopes arise from residual AO-corrected atmosphericwavefront errors, generating short-lived aberrations that will average intoa halo over a long exposure, also limiting the sensitivity of exoplanetdetection. We develop the framework for a solution to both of theseproblems using the self-coherent camera (SCC), to be applied toground-based telescopes, called Fast Atmospheric SCC Technique (FAST).Simulations show that for typical ExAO targets the FAST approach can reach~100 times better in raw contrast than what is currently achieved with ExAOinstruments if we extrapolate for an hour of observing time, illustratingthat the sensitivity improvement from this method could play an essentialrole in the future ground-based detection and characterization of lowermass/colder exoplanets.