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Low-order wavefront control using a Zernike sensor through Lyot coronagraphs for exoplanet imaging: II. Concurrent operation with stroke minimization

Autor: R. Pourcelot, E. H. Por, M. N’Diaye, H. Benard, G. Brady, L. Canas, M. Carbillet, K. Dohlen, I. Laginja, J. Lugten, J. Noss, M. D. Perrin, P. Petrone, L. Pueyo, S. F. Redmond, A. Sahoo, A. Vigan, S. D. Will, R. Soummer

Context. Wavefront sensing and control (WFSC) will play a key role in improving the stability of future large segmented space telescopes while relaxing the thermo-mechanical constraints on the observatory structure. Coupled with a coronagraph to reje

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::728cf23b2312600ce2f04879a69a9864
http://arxiv.org/abs/2301.03242

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Imageur à haut contraste pour les télescopes à ouverture complexe (HICAT) : 8. Démonstration de Dark Zone avec boucles fermées simultanées à bas ordres

Publikováno v: Proceedings of SPIE
SPIE Astronomical Telescopes + Instrumentation
SPIE Astronomical Telescopes + Instrumentation, Jul 2022, Montréal, Canada. ⟨10.1117/12.2630444⟩

International audience; We present recent laboratory results demonstrating high-contrast coronagraphy for the future space-based large IR/Optical/Ultraviolet telescope recommended by the Decadal Survey. The High-contrast Imager for Complex Aperture T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62beb2728699711ff399e0928e4cb3bf
https://hal.science/hal-03935132

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Low-order wavefront control using a Zernike sensor through Lyot coronagraphs for exoplanet imaging. Blind stabilization of an image dark hole

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2022, 663, pp.A49. ⟨10.1051/0004-6361/202243145⟩

Context.The combination of large segmented space telescopes, coronagraphy, and wavefront control methods is a promising solution for producing a dark hole (DH) region in the coronagraphic image of an observed star in order to study planetary companio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c00dbd45da480958756a1d7ae961055
https://hal-insu.archives-ouvertes.fr/insu-03780768

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Development and Implementation of a Community Paramedicine Program in Rural United States

Autor: Hannah L Johnson, Kirk A Gunderson, Peter N Carlson, Marlene Dirkes, Lucas A. Myers, Tasha M Bjork, Justin E Bowe, Matthew D Will, Paul W Krantz, Christopher S. Russi

Publikováno v: Western Journal of Emergency Medicine
Western Journal of Emergency Medicine, Vol 21, Iss 5 (2020)

Introduction Community paramedicine (CP) is an innovative care model focused on medical management for patients suffering from chronic diseases or other conditions that result in over-utilization of healthcare services. Despite their value, CP care m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69a42eda68821f52b604d78af265950c
http://europepmc.org/articles/PMC7514407

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The ASAS-SN catalogue of variable stars – VII. Contact binaries are different above and below the Kraft break

Autor: Christopher S. Kochanek, Tharindu Jayasinghe, K. Z. Stanek, Todd A. Thompson, J. L. Prieto, T W-S Holoien, N. Hurst, Marc H. Pinsonneault, Ondřej Pejcha, D. Will, Benjamin J. Shappee, G. Pojmanski, Michał Pawlak, S. Otero

Publikováno v: Monthly Notices of the Royal Astronomical Society

We characterize ${\sim} 71,200$ W UMa type (EW) contact binaries, including ${\sim} 12,600$ new discoveries, using ASAS-SN $V$-band all-sky light curves along with archival data from Gaia, 2MASS, AllWISE, LAMOST, GALAH, RAVE, and APOGEE. There is a c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ebe0b4971ee63aef8db4d64df2fd7db
https://doi.org/10.1093/mnras/staa518

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Wavefront tolerances of space-based segmented telescopes at very high contrast: Experimental validation

Autor: Scott D. Will, Laurent Pueyo, Iva Laginja, Laurent M. Mugnier, James Noss, Peter Petrone, Rémi Soummer, Emiel H. Por, Jean-François Sauvage, Keira Brooks, Marshall D. Perrin

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2022, 658, pp.A84. ⟨10.1051/0004-6361/202142150⟩

Context: The detection and characterization of Earth-like exoplanets (exoEarths) from space requires exquisite wavefront stability at contrast levels of $10^{-10}$. On segmented telescopes in particular, aberrations induced by cophasing errors lead t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::719fe19b053c9329d5ef22b886cdcba2
https://hal.science/hal-03558816/file/aa42150-21.pdf

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Implementation of a dark zone maintenance algorithm for speckle drift correction in a high contrast space coronagraph

Autor: Susan F. Redmond, Leonid Pogorelyuk, Laurent Pueyo, Emiel Por, James Noss, Scott D. Will, Iva Laginja, Keira Brooks, Matthew Maclay, J. Fowler, N. Jeremy Kasdin, Marshall D. Perrin, Rémi Soummer

Publikováno v: Journal of Astronomical Telescopes Instruments and Systems
Journal of Astronomical Telescopes Instruments and Systems, 2022, 8 (3), ⟨10.1117/1.JATIS.8.3.035001⟩

International audience; Due to the limited number of photons, directly imaging planets requires long integration times with a coronagraphic instrument. The wavefront must be stable on the same time scale, which is often difficult in space due to time

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61413ec5b4f680715ccab803bf57849b
https://insu.hal.science/insu-03863240

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