Apertures and secondary support structures selected for the study (12m diameter or 12m flat-to-flat diameter).

To meet the challenge of segmented and obscured aperture coronagraphy, the ExEP’s Segmented Coronagraph Design and Analysis (SCDA) study funds several groups to design and model coronagraph architectures that enable 10-10 contrast sensitivities (needed to direct-image Earth-like exoplanets orbiting Sun-like stars) with optimal throughput and robustness to many wavefront errors. In addition to the baseline 12 m SCDA set of segmented and obscured apertures shown above, the SCDA teams are working with the LUVOIR study design team to include their 15 m aperture. Robustness calculations will determine the sensitivities of these coronagraph designs to the effects of optical misalignments, and help to establish error budgets. How these error budgets translate to sensing and control of the wavefront errors through mechanical movements is a critical question for the future of these architectures and coronagraphy in space.

SCDA teams

The SCDA study is a collaboration of coronagraphers at multiple institutions (STScI, GSFC, Ames, JPL, Caltech, University of Arizona) investigating several flavors of coronagraph as starting points for achieving designs that maximize science yield (number of detected exo-Earths) and are robust to expected on-orbit disturbances. The task lead is Brendan Crill (ExEP - NASA/JPL) and the technical lead is Stuart Shaklan (NASA/JPL).

  1. Apodized Pupil Lyot Coronagraph: Rémi Soummer (STScI) et al.

  2. Vortex Coronagraph: Dimitri Mawet (Caltech) et al.

  3. Phase-Induced Amplitude Apodization - Complex Mask Coronagraph (PIAACMC): Guyon (University of Arizona) et al in collaboration wtih Belikov et al. TDEM work.

  4. Hybrid Lyot Coronagraph: El Dorado Riggs (JPL) et al.

  5. Visible Nuller Coronagraph: Hicks (GSFC) et al.

SCDA Bibliography

  • Mazoyer, J., Pueyo, L., N’Diaye, M., Fogarty, K., Zimmerman, N., Leboulleux, L., et al. (2018). Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm. The Astronomical Journal, 155(1), 7. http://doi.org/10.3847/1538-3881/aa91cf

  • Ruane, G., Mawet, D., Mennesson, B., Jewell, J., & Shaklan, S. (2018). Vortex coronagraphs for the Habitable Exoplanet Imaging Mission concept: theoretical performance and telescope requirements. Journal of Astronomical Telescopes, Instruments, and Systems, 4(1), 015004. http://doi.org/10.1117/1.JATIS.4.1.015004

  • Jeffrey Jewell, Garreth Ruane, Stuart Shaklan, Dimitri Mawet, Dave Redding, "Optimization of coronagraph design for segmented aperture telescopes," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000H (13 September 2017) https://doi.org/10.1117/12.2274574

  • Ruane, G., Mawet, D., Jewell, J., & Shaklan, S. (2017). Performance and sensitivity of vortex coronagraphs on segmented space telescopes. In Techniques and Instrumentation for Detection of Exoplanets VIII (Vol. 10400, p. 104000J). International Society for Optics and Photonics. http://doi.org/10.1117/12.2274508

  • Justin M. Knight, John Brewer, Ryan Hamilton, Karen Ward, Tom D. Milster, Olivier Guyon, "Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000N (12 September 2017); https://doi.org/10.1117/12.2273558

  • Brendan P. Crill, Nicholas Siegler, "Space technology for directly imaging and characterizing exo-Earths," Proc. SPIE 10398, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII, 103980H (5 September 2017); https://doi.org/10.1117/12.2275697

  • Johan Mazoyer, Laurent Pueyo, Mamadou N'Diaye, Kevin Fogarty, Lucie Leboulleux, Sylvain Egron, Colin Norman, "Capabilities of ACAD-OSM, an active method for the correction of aperture discontinuities," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000G (1 September 2017); https://doi.org/10.1117/12.2273070

  • Johan Mazoyer, Laurent Pueyo, Mamadou N'Diaye, Dimitri Mawet, Rémi Soummer, Colin Norman, "Correcting for the effects of pupil discontinuities with the ACAD method," Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99044T (29 July 2016); https://doi.org/10.1117/12.2232907

  • Neil T. Zimmerman, Mamadou N'Diaye, Kathryn E. St. Laurent, Rémi Soummer, Laurent Pueyo, Christopher C. Stark, Anand Sivaramakrishnan, Marshall Perrin, Robert J. Vanderbei, N. Jeremy Kasdin, Stuart Shaklan, Alexis Carlotti, "Lyot coronagraph design study for large, segmented space telescope apertures," Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99041Y (29 July 2016); https://doi.org/10.1117/12.2233205