Zobrazeno 1 - 10
of 168
pro vyhledávání: '"Douglas, Ewan S."'
Autor:
M., Sai Krishanth P., Douglas, Ewan S., Anche, Ramya M., Hom, Justin, Cahoy, Kerri L., Debes, John H., Jang-Condell, Hannah, Rebollido, Isabel, Ren, Bin B., Stark, Christopher C., Thompson, Robert, Xin, Yinzi
Epsilon Eridani ($\epsilon$ Eri) is one of the first debris disk systems detected by the Infrared Astronomical Satellite (IRAS). However, the system has thus far eluded detection in scattered light with no components having been directly imaged. Its
Externí odkaz:
http://arxiv.org/abs/2408.06973
Autor:
Jenkins, Emory L., Anche, Ramya M., Van Gorkom, Kyle J., Riggs, A. J. Eldorado, Douglas, Ewan S.
Future space observatories will likely have segmented primaries, causing diffraction effects that reduce coronagraph performance. Reflective binary pupil apodizer masks can mitigate these, with the metamaterial black silicon (BSi) showing promise as
Externí odkaz:
http://arxiv.org/abs/2406.19028
Autor:
Van Gorkom, Kyle, Douglas, Ewan S, Milani, Kian, Ashcraft, Jaren N, Anche, Ramya M, Jenkins, Emory, Ingraham, Patrick, Haffert, Sebastiaan, Kim, Daewook, Choi, Heejoo, Durney, Olivier
The Space Coronagraph Optical Bench (SCoOB) is a high-contrast imaging testbed built to demonstrate starlight suppression techniques at visible wavelengths in a space-like vacuum environment. The testbed is designed to achieve ${<}10^{-8}$ contrast f
Externí odkaz:
http://arxiv.org/abs/2406.18885
Autor:
Ashcraft, Jaren N., Douglas, Ewan S., Anche, Ramya M., Van Gorkom, Kyle, Jenkins, Emory, Melby, William, Millar-Blanchaer, Maxwell A.
High-contrast imaging in the next decade aims to image exoplanets at smaller angular separations and deeper contrasts than ever before. A problem that has recently garnered attention for telescopes equipped with high-contrast coronagraphs is polariza
Externí odkaz:
http://arxiv.org/abs/2406.19616
Publikováno v:
SPIE Journal of Astronomical Telescopes, Instruments, and Systems. April 2024
High-order wavefront sensing and control (HOWFSC) is key to create a dark hole region within the coronagraphic image plane where high contrasts are achieved. The Roman Coronagraph is expected to perform its HOWFSC with a ground-in-the-loop scheme due
Externí odkaz:
http://arxiv.org/abs/2405.03899
Autor:
Ashcraft, Jaren N., Douglas, Ewan S., Anche, Ramya, Dube, Brandon D., Derby, Kevin Z., Furenlid, Lars, Kautz, Maggie, Kim, Daewook, Milani, Kian, Riggs, A. J. Eldorado
Paraxial diffraction modeling based on the Fourier transform has seen widespread implementation for simulating the response of a diffraction-limited optical system. For systems where the paraxial assumption is not sufficient, a class of algorithms ha
Externí odkaz:
http://arxiv.org/abs/2404.12454
Autor:
Xin, Yinzi, Pueyo, Laurent, Laugier, Romain, Pogorelyuk, Leonid, Douglas, Ewan S., Pope, Benjamin J. S., Cahoy, Kerri L.
Directly observing exoplanets with coronagraphs is impeded by the presence of speckles from aberrations in the optical path, which can be mitigated in hardware with wavefront control as well as in post-processing. This work explores using an instrume
Externí odkaz:
http://arxiv.org/abs/2401.04269
For diffraction-limited optical systems an accurate physical optics model is necessary to properly evaluate instrument performance. Astronomical observatories outfitted with coronagraphs for direct exoplanet imaging require physical optics models to
Externí odkaz:
http://arxiv.org/abs/2310.20026
Autor:
Choi, Heejoo, Kim, Young-Sik, Kang, Hyukmo, Blomquist, Solvay, Tailor, Hill, Kelly, Douglas, Eiklenborg, Mike, Douglas, Ewan S., Kim, Daewook
Publikováno v:
Proceedings Volume 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; 126770F (2023)
The size of the optics used in observatories is often limited by fabrication, metrology, and handling technology, but having a large primary mirror provides significant benefits for scientific research. The evolution of rocket launch options enables
Externí odkaz:
http://arxiv.org/abs/2310.12376
Autor:
Bailey, Vanessa P., Bendek, Eduardo, Monacelli, Brian, Baker, Caleb, Bedrosian, Gasia, Cady, Eric, Douglas, Ewan S., Groff, Tyler, Hildebrandt, Sergi R., Kasdin, N. Jeremy, Krist, John, Macintosh, Bruce, Mennesson, Bertrand, Morrissey, Patrick, Poberezhskiy, Ilya, Subedi, Hari B., Rhodes, Jason, Roberge, Aki, Ygouf, Marie, Zellem, Robert T., Zhao, Feng, Zimmerman, Neil T.
The Nancy Grace Roman Space Telescope Coronagraph Instrument is a critical technology demonstrator for NASA's Habitable Worlds Observatory. With a predicted visible-light flux ratio detection limit of 1E-8 or better, it will be capable of reaching ne
Externí odkaz:
http://arxiv.org/abs/2309.08672