Image restoration of exoplanets observed with a hypertelescope

• Project/Area Number: 25287032
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Hokkaido University
• Principal Investigator: BABA Naoshi 北海道大学, ー, 名誉教授 (70143261)
• Co-Investigator(Renkei-kenkyūsha): TAMURA Motohide 東京大学, 大学院理学研究科, 教授 (00260018) ; MURAKAMI Naoshi 北海道大学, 大学院工学研究院, 助教 (80450188) ; MIURA Noriaki 北見工業大学, 工学部, 教授 (30209720)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000); Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2014: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000); Fiscal Year 2013: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
• Keywords: 光学赤外線天文学 / 望遠鏡 / 系外惑星 / 像再生 / 天体干渉計

Outline of Final Research Achievements

In order to resolve exoplanets an effective aperture with several tens or more kilometers is needed. A hypertelescope consists of many elemental telescopes. The beams from the elemental telescopes are enlarged and arranged compactly on the imaging lens to form the snap-shot image. This procedure is referred to densification.
Snap-shot images formed with a limited number of elemental telescopes do not exhibit high quality features. Some image restoration should be implemented to reveal the surface structures of exoplanets. One of annoying problems in hypertelescope image restoration is shift-variant characteristic of PSF that is caused by the pupil densification. We show that the CLEAN algorithm manages to restore images formed with shift-variant PSF and works well for noise-less images. For noisy images the pseudo Wiener filtering works better to restore the images.

Research Products

• [Int'l Joint Research] Caltech/Univ. Arizona/NASA Ames(米国)
• [Journal Article] Deconvolution of partially compensated solar images from additional wavefront sensing (2016)
  • Author(s): Noriaki Miura, Akira Oh-ishi, Susumu Kuwamura, Naoshi Baba, Satoru Ueno, Yoshikazu Nakatani, and Kiyoshi Ichimoto
  • Journal Title: Applied Optics Volume: 55 Issue: 10 Pages: 2484-2488
  • DOI: 10.1364/ao.55.002484
  • NAID: 120006230249
  • Peer Reviewed
• [Journal Article] The Subaru Coronagraphic Extreme Adaptive Optics System: enabling high-contrast imaging on solar-system scales (2015)
  • Author(s): N. Jovanovic,..., N. Murakami, F. Oshiyama, N. Baba,..., M. Tamura, et al
  • Journal Title: Publ. Astron. Soc. Pacific Volume: 127 Pages: 890-910
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of a new solar adaptive optics system at the Hida Observatory (2014)
  • Author(s): Miura, N., Oh-ishi, A., Aoki, S., Mogaki, H., Kuwamura, S., Baba, N., Hanaoka, Y., Yamaguchi, M., Ueno, S., Nakatani, Y., and Ichimoto, K.
  • Journal Title: Proceedings of the SPIE Volume: 9148 Pages: 914831-914831
  • DOI: 10.1117/12.2055786
• [Presentation] Image restoration for a hypertelescope (2016)
  • Author(s): Y. Nakai, N. Baba, N. Murakami, N. Miura, and M. Tamura
  • Organizer: SPIE. Astronomical Telescopes + Instrumentation
  • Place of Presentation: Edinburgh International Conference Centre, Edinburgh, UK
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] ハイパー望遠鏡における撮像画像処理の計算機シミュレーションII (2016)
  • Author(s): 中井悠人、馬場直志、村上尚史
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京（八王子市）
  • Year and Date: 2016-03-15
• [Presentation] 太陽系外惑星直接検出のための技術開発 (2016)
  • Author(s): 馬場直志
  • Organizer: 平成27年度光産業技術シンポジウム‐光加工・計測が創る新たな社会と産業イノベーション‐
  • Place of Presentation: リーガロイヤルホテル東京（東京都新宿区）
  • Year and Date: 2016-02-03
  • Invited
• [Presentation] ハイパー望遠鏡－系外惑星の解像に向けて－ (2015)
  • Author(s): 馬場直志
  • Organizer: 2015年度光学赤外線天文連絡会シンポジウム「光赤外将来計画：報告書の最終取りまとめと長期戦略への布石」
  • Place of Presentation: 国立天文台（三鷹市）
  • Year and Date: 2015-09-14
• [Presentation] Solar image improvement based on deconvolution using additional wavefront sensor (2015)
  • Author(s): N. Miura, A. Oh-ishi, S. Kuwamura, N. Baba, S. Ueno, Y. Nakatani, and K. Ichimoti
  • Organizer: 2015 OSA Optics and Photonics Congress: Imaging and Applied Optics
  • Place of Presentation: Arlington, Virginia, USA
  • Year and Date: 2015-06-07
  • Int'l Joint Research
• [Presentation] ハイパー望遠鏡における撮像画像処理の計算機シミュレーション (2015)
  • Author(s): 中井悠人、馬場直志、村上尚史
  • Organizer: 日本天文学会2015年春季年会
  • Place of Presentation: 大阪大学（豊中）
  • Year and Date: 2015-03-18 – 2015-03-21
• [Presentation] Towards direct imaging of exoplanets (2015)
  • Author(s): N. Baba, Y. Nakai, and N. Murakami
  • Organizer: International Conference on Optics and Photonics (ICOP2015)
  • Place of Presentation: Calcutta Univ. (Kolkata, India)
  • Year and Date: 2015-02-20 – 2015-02-22
  • Invited
• [Presentation] 太陽補償光学系の開発と補償効果のシミュレーション (2014)
  • Author(s): 三浦則明、大石歩、大石明、桑村 進、馬場直志、花岡庸一郎、北井礼三郎、上野悟、仲谷善一、一本潔
  • Organizer: 日本天文学会2014年秋季年会
  • Place of Presentation: 山形大学（山形）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] 太陽多層共役補償光学系の開発と上空波面センサの評価 (2014)
  • Author(s): 大石歩、三浦則明、大石明、桑村 進、馬場直志、上野悟、仲谷善一、一本潔
  • Organizer: 日本天文学会2014年秋季年会
  • Place of Presentation: 山形大学（山形）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] Development of a new solar adaptive optics system at the Hida Observatory (2014)
  • Author(s): N. Miura, A. Oh-ishi, S. Aoki, H. Magaki, S. Kuwamura, N. Baba, Y. Hanaoka, M. Yamaguchi, S. Ueno, Y. Nakatani, and K. Ichimoto
  • Organizer: SPIE Conf. on Astronomical Telescopes and Instrumentation 2014
  • Place of Presentation: Montreal, Canada
  • Year and Date: 2014-06-22 – 2014-06-27
• [Presentation] 上空波面センサの開発と太陽観測への適用 (2013)
  • Author(s): ６） 大石歩、三浦則明、茂垣光、桑村 進、馬場直志、上野悟、仲谷善一、一本潔
  • Organizer: 日本天文学会2013年秋季年会
  • Place of Presentation: 東北大学（仙台）
• [Presentation] 波面センサ情報を用いる太陽ＡＯ観測像の改善 (2013)
  • Author(s): ５） 青木章太郎、三浦則明、大石歩、茂垣光、桑村 進、馬場直志、上野悟、仲谷善一、一本潔
  • Organizer: 日本天文学会2013年秋季年会
  • Place of Presentation: 東北大学（仙台）
• [Remarks] 超高性能な望遠鏡を目指して
  • URL: http://www.eng.hokudai.ac.jp/engineering/2014-10/feature1410-02.html