تقرير
Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk
| العنوان: | Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk |
|---|---|
| المؤلفون: | Uyama, Taichi, Ren, 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 |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | High-contrast imaging of exoplanets and protoplanetary disks depends on wavefront sensing and correction made by adaptive optics instruments. Classically, wavefront 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 wavefront 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 wavefront sensing we achieved $\sim$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 VLT/SPHERE polarimetric observation, which is the first detection of the SR~21 spiral in total intensity at $L^\prime$ band. We also compared the contrast limit of our result ($10^{-4}$ at $0\farcs4$ and $2\times10^{-5}$ at $1\farcs0$) with the archival data that were taken with optical wavefront sensing and confirmed the improvement, particularly at $\leq0\farcs5$. Our observation demonstrates that the NIR PWFS improves AO performance and will provide more opportunities for red targets in the future. Comment: accepted for publication in AJ, 8 pages, 7 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-3881/abc69a |
| URL الوصول: | http://arxiv.org/abs/2011.00044 |
| رقم الأكسشن: | edsarx.2011.00044 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-3881/abc69a |
|---|