Prof. Toru Yamada Profile

Prof. Toru Yamada

at Institute of Space and Astronautical Science

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Author

Publications (7)

Proceedings Article | 6 October 2023 Presentation

RST CGI: final verification and calibration of prism and polarizer flight units

Tyler Groff, Neil Zimmerman, Hari Subedi, John Titus, Dylan Bell, Guangjun Gao, Samuel Gaylin, Nicholas Nicolaeff, Toru Yamada, Motohide Tamura

Proceedings Volume 12680, 126800W (2023) https://doi.org/10.1117/12.2677576

KEYWORDS: Prisms, Calibration, Polarizers, Polarization, Spectroscopes, Spectral resolution, Equipment, Target detection, Space telescopes, Signal to noise ratio

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Proceedings Article | 5 October 2023 Presentation + Paper

Development of the coherent differential imaging on speckle area nulling (CDI-SAN) method

Kenta Yoneta, Jun Nishikawa, Yutaka Hayano, Masatsugu Iribe, Kodai Yamamoto, Ryo Tsukui, Naoshi Murakami, Mizuki Asano, Hiromu Muramatsu, Yosuke Tanaka, Motohide Tamura, Takahiro Sumi, Toru Yamada, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Kyohoon Ahn

Proceedings Volume 12680, 126800D (2023) https://doi.org/10.1117/12.2676294

KEYWORDS: Modulation, Coherence imaging, Speckle, Electric fields, Equipment, Wavefronts, Telescopes, Optical coherence, Exoplanets

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Proceedings Article | 29 August 2022 Poster + Paper

Development of a high-precision spectrograph for diffraction-limited coronagraphs

Shunsuke Ota, Taro Matsuo, Satoshi Itoh, Tetso Kano, Yuji Ikeda, Reiki Kojima, Takashi Sukegawa, Tomonao Nakayasu, Masatsugu Koyama, Takahiri Sumi, Toru Yamada

Proceedings Volume 12188, 1218851 (2022) https://doi.org/10.1117/12.2629324

KEYWORDS: Spectrographs, Mirrors, Coronagraphy, Wavefronts, Spectroscopy, Wavefront aberrations, Optical design

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Proceedings Article | 29 August 2022 Poster + Paper

Development progress of diffraction-limited coronagraphs with moderate spectral bandwidths

Satoshi Itoh, Taro Matsuo, Shunsuke Ota, Yuji Ikeda, Reiki Kojima, Toru Yamada, Takahiro Sumi

Proceedings Volume 12188, 121884D (2022) https://doi.org/10.1117/12.2629087

KEYWORDS: Coronagraphy, Telescopes, Planets, Spectroscopy, Stars, Modulation, Diffraction, Target detection, Point spread functions, Image segmentation

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Proceedings Article | 27 August 2022 Presentation + Paper

GREX-PLUS: galaxy reionization explorer and planetary universe spectrometer

Akio Inoue, Hidehiro Kaneda, Toru Yamada, Yuichi Harikane, Daisuke Ishihara, Tadayuki Kodama, Yutaka Komiyama, Takashi Moriya, Kentaro Motohara, Hideko Nomura, Masami Ouchi, Shinki Oyabu, Toyoaki Suzuki, Takehiko Wada, Issei Yamamura

Proceedings Volume 12180, 121801I (2022) https://doi.org/10.1117/12.2626050

KEYWORDS: Galactic astronomy, Spectroscopy, Sensors, Cameras, Telescopes, Near infrared, Objectives, Mirrors, Imaging systems, Cryogenics

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Proceedings Article | 13 December 2020 Presentation

The joint infrared space observatory SPICA: unveiling the obscured universe

Peter Roelfsema, Hiroshi Shibai, Hidehiro Kaneda, Marc Sauvage, Martin Giard, Francisco Najarro, Charles Bradford, Toru Yamada, Jan Tauber, Marc Audard, Pieter Dieleman, Yasuo Doi, David Elbaz, Matt Griffin, Frank Helmich, Astrid Heske, Mitsuhiko Honda, Willem Jellema, Shoko Jin, Mika Juvela, Inga Kamp, Franz Kerschbaum, Csaba Kiss, Kotaro Kohno, Oliver Krause, Gert de Lange, Bengt Larsson, Jesus Martin-Pintado, Hideo Matsuhara, Takao Nakagawa, Tohru Nagao, David Naylor, Hideko Nomura, Hiroyuki Ogawa, Takashi Onaka, Jacques Rouquet, Luigi Spinoglio, Ryszard Szczerba, Floris van der Tak, Bart Vandenbussche, Shiang-Yu Wang, Stafford Withington

Proceedings Volume 11443, 1144325 (2020) https://doi.org/10.1117/12.2562946

KEYWORDS: Infrared Space Observatory, Sensors, Telescopes, Spectroscopes, Imaging systems, Liquids, Cryogenics, Observatories, Ions, Molecules

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Proceedings Article | 10 July 2018 Presentation

SPICA: a joint infrared space observatory (Conference Presentation)

Peter Roelfsema, Hiroshi Shibai, Kees Wafelbakker, Gert de Lange, Martin Giard, Francisco Najarro, Marc Audard, Lee Armus, Charles Bradford, Yasuo Doi, Matt Griffin, Frank Helmich, Inga Kamp, Hidehiro Kaneda, Ciska Kemper, Franz Kerschbaum, Kotaro Kohno, Oliver Krause, Bengt Larsson, Sue Madden, Hideo Matsuhara, Takao Nakagawa, David Naylor, Hiroyuki Ogawa, Takashi Onaka, Luigi Spinoglio, Floris van der Tak, Bart Vandenbussche, Toru Yamada

Proceedings Volume 10698, 106980A (2018) https://doi.org/10.1117/12.2313124

KEYWORDS: Space telescopes, Telescopes, Infrared Space Observatory, Planetary systems, Infrared radiation, Infrared telescopes, Galaxy evolution, Sensors, Cryogenics, Spectroscopes

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Measurements in the infrared wavelength domain allow us to assess directly the physical state and energy balance of cool matter in space, thus enabling the detailed study of the various processes that govern the formation and early evolution of stars and planetary systems in the Milky Way and of galaxies over cosmic time. Previous infrared missions, from IRAS to Herschel, have revealed a great deal about the obscured Universe, but sensitivity has been limited because up to now it has not been possible to fly a telescope that is both large and cold. Such a facility is essential to address key astrophysical questions, especially concerning galaxy evolution and the development of planetary systems. SPICA is a mission concept aimed at taking the next step in mid- and far-infrared observational capability by combining a large and cold telescope with instruments employing state-of-the-art ultra-sensitive detectors. The mission concept foresees a 2.5-meter diameter telescope cooled to below 8 K. Rather than using liquid cryogen, a combination of passive cooling and mechanical coolers will be used to cool both the telescope and the instruments. With cooling not dependent on a limited cryogen supply, the mission lifetime can extend significantly beyond the required three years. The combination of low telescope background and instruments with state-of-the-art detectors means that SPICA can provide a huge advance on the capabilities of previous missions. The SPICA instrument complement offers spectral resolving power ranging from ~50 through 11000 in the 17-230 µm domain as well as ~28.000 spectroscopy between 12 and 18 µm. Additionally, SPICA will be capable of efficient 30-37 µm broad band mapping, and small field spectroscopic and polarimetric imaging in the 100-350 µm range. SPICA will enable far infrared spectroscopy with an unprecedented sensitivity of ~5x10-20 W/m2 (5σ/1hr) - at least two orders of magnitude improvement over what has been attained to date. With this exceptional leap in performance, new domains in infrared astronomy will become accessible, allowing us, for example, to unravel definitively galaxy evolution and metal production over cosmic time, to study dust formation and evolution from very early epochs onwards, and to trace the formation history of planetary systems.

Showing 5 of 7 publications

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