Zobrazeno 1 - 10
of 2 504
pro vyhledávání: '"Douglas, P S"'
Direct imaging of exoplanets is a challenging task that involves distinguishing faint planetary signals from the overpowering glare of their host stars, often obscured by time-varying stellar noise known as "speckles". The predominant algorithms for
Externí odkaz:
http://arxiv.org/abs/2409.16466
Autor:
Skaf, Nour, Jensen-Clem, Rebecca, Hunter, Aaron, Guyon, Olivier, Deo, Vincent, Hinz, Phil, Cetre, Sylvain, Chambouleyron, Vincent, Fowler, J., Sengupa, Aditya, Salama, Maissa, Males, Jared, McEwen, Eden, Douglas, Ewan S., Van Gorkom, Kyle, Por, Emiel, Lucas, Miles, Ferreira, Florian, Sevin, Arnaud, Bowens-Rubin, Rachel, Cranney, Jesse, Calvin, Ben
Real-time control (RTC) is pivotal for any Adaptive Optics (AO) system, including high-contrast imaging of exoplanets and circumstellar environments. It is the brain of the AO system, and what wavefront sensing and control (WFS\&C) techniques need to
Externí odkaz:
http://arxiv.org/abs/2409.13126
Continuous wavefront sensing benefits space observatories in on-orbit optical performance maintenance. To measure the phase of a wavefront, phase retrieval is an attractive technique as it uses multiple point spread function (PSF) images that are acq
Externí odkaz:
http://arxiv.org/abs/2409.10500
Autor:
Blomquist, Solvay, Choi, Heejoo, Kang, Hyukmo, Derby, Kevin, Nicolas, Pierre, Douglas, Ewan S., Kim, Daewook
When a telescope doesn't reach a reasonable point spread function on the detector or detectable wavefront quality after initial assembly, a coarse phase alignment on-sky is crucial. Before utilizing a closed loop adaptive optics system, the observato
Externí odkaz:
http://arxiv.org/abs/2409.04640
Autor:
Huie, Ruby, Mears, Austin, Montoya, Manny, Vargas, Dan, West, Grant, Hofstadter, Daniel, Douglas, Ewan S.
As wavefront quality demands tighten on space systems for applications such as astronomy and laser communication, mounting small optics such that the wavefront is undisturbed, positioning is adjustable and the design is producible, while surviving ha
Externí odkaz:
http://arxiv.org/abs/2409.04403
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
Publikováno v:
The Astronomical Journal, 168:169 (10pp), 2024 October
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