Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk
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Author
Uyama, TaichiRen, Bin
Mawet, Dimitri
Ruane, Garreth
Bond, Charlotte Z.
Hashimoto, Jun
Liu, Michael C.
Muto, Takayuki
Ruffio, Jean-Baptiste
Wallack, Nicole
Baranec, Christoph
Bowler, Brendan P.
Choquet, Elodie
Chun, Mark
Delorme, Jacques-Robert
Fogarty, Kevin
Guyon, Olivier
Jensen-Clem, Rebecca
Meshkat, Tiffany
Ngo, Henry
Wang, Jason J.
Wang, Ji
Wizinowich, Peter
Ygouf, Marie
Zuckerman, Benjamin
Affiliation
Univ Arizona, Steward ObservIssue Date
2020-11-23
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IOP PUBLISHING LTDCitation
Uyama, T., Ren, B., Mawet, D., Ruane, G., Bond, C. Z., Hashimoto, J., ... & Zuckerman, B. (2020). Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk. The Astronomical Journal, 160(6), 283.Journal
ASTRONOMICAL JOURNALRights
© 2020. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
High-contrast imaging of exoplanets and protoplanetary disks depends on wave front sensing and correction made by adaptive optics instruments. Classically, wave front sensing has been conducted at optical wavelengths, which made high-contrast imaging of red targets such as M-type stars or extincted T Tauri stars challenging. Keck/NIRC2 has combined near-infrared (NIR) detector technology with the pyramid wave front sensor (PWFS). With this new module we observed SR 21, a young star that is brighter at NIR wavelengths than at optical wavelengths. Compared with the archival data of SR 21 taken with the optical wave front sensing we achieved similar to 20% better Strehl ratio in similar natural seeing conditions. Further post-processing utilizing angular differential imaging and reference-star differential imaging confirmed the spiral feature reported by the Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet REsearch instrument polarimetric observation, which is the first detection of the SR 21 spiral in total intensity at L ' band. We also compared the contrast limit of our result (10(-4) at 04 and 2 x 10(-5) at 10) with the archival data that were taken with optical wave front sensing and confirmed the improvement, particularly at <= 05. Our observation demonstrates that the NIR PWFS improves AO performance and will provide more opportunities for red targets in the future.ISSN
0004-6256EISSN
1538-3881Version
Final published versionSponsors
National Science Foundationae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/abc69a