Dr. Aoi Takahashi Profile

Dr. Aoi Takahashi

at JAXA

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 18 July 2024 Poster + Paper

Overview and status of the fiber delivery subsystem (FIB) of Keck/HISPEC, the diffraction-limited y-K band spectrograph for exoplanet characterization

Nemanja Jovanovic, Greg Sercel, Takayuki Kotani, John Bailey, Ashley Baker, Svarun Soda, Aoi Takahashi, Jonathan Lin, Yoo Jung Kim, Michael Fitzgerald, Sebastien Vievard, Chris Betters, Sergio Leon-Saval, Jocelyn Ferrara, Truman Wold, Jonathan Steiner, Jim Thorne, Marc Kassis, Motohide Tamura, Dimitri Mawet

Proceedings Volume 13096, 130966I (2024) https://doi.org/10.1117/12.3020499

KEYWORDS: Single mode fibers, Switches, Switching, Calibration, Microelectromechanical systems, Optical switching, Spectrographs

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Proceedings Article | 18 July 2024 Poster + Paper

The South Africa Near-Infrared Doppler (SAND) instrument: design and fabrications

Aoi Takahashi, Takayuki Kotani, Masayuki Kuzuhara, Takeru Nakajima, Riku Urago, Kou Hosokawa, Shotaro Tada, Motohide Tamura, Jun Nishikawa, Akitoshi Ueda, Takuya Takarada, Teruyuki Hirano, Takuma Kokusho, Eiko Kozaki, Takahiro Nagayama, Takahiro Sumi, Daisuke Suzuki, Hibiki Yama, Tomoyasu Yamamuro

Proceedings Volume 13096, 1309669 (2024) https://doi.org/10.1117/12.3018194

KEYWORDS: Stars, Telescopes, Spectrographs, Sand, Mirrors, Planets, Spectral resolution, Signal to noise ratio, Optical alignment, Equipment

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SPIE Journal Paper | 11 March 2021 Open Access

Mid-infrared spectrometer and camera for the Origins Space Telescope

Itsuki Sakon, Thomas Roellig, Kimberly Ennico-Smith, Taro Matsuo, Yuji Ikeda, Tomoyasu Yamamuro, Keigo Enya, Takehiko Wada, Mitsunobu Kawada, Aoi Takahashi, Yuki Sarugaku, Naofumi Fujishiro, Naoshi Murakami, Jun Nishikawa, Takayuki Kotani, Shohei Goda, Masayuki Ido, Satoshi Itoh, Takahiro Tsuboi, Takahiro Sumi, Masatsugu Kamiura, Takeo Manome, Naoto Iida, Kentaro Yanagibashi, Thomas Greene, Bernardus Helvensteijn, Lynn Hofland, Roy Johnson, Ali Kashani, Emmett Quigley, Robert McMurray, Hanae Inami, Denis Burgarella, the Origins Space Telescope mission concept study team

JATIS, Vol. 7, Issue 01, 011013, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.011013

KEYWORDS: Sensors, Spectroscopy, Mirrors, Cameras, Mid-IR, Space telescopes, Electronics, Telescopes, Detector arrays, Mercury cadmium telluride

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The mid-infrared spectrometer and camera transit spectrometer (MISC-T) is one of the three baseline instruments for Origins Space Telescope (Origins) and provides the capability to assess the habitability of nearby exoplanets and search for signs of life. MISC-T employs a densified pupil optical design, and HgCdTe and Si:As detector arrays. This optical design allows the instrument to be relatively insensitive to minor line-of-sight pointing drifts and telescope aberrations, and the detectors do not require a sub-Kelvin refrigerator. MISC-T has three science spectral channels that share the same field-of-view by means of beam splitters, and all channels are operated simultaneously to cover the full spectral range from 2.8 to 20 μm at once with exquisite stability and precision (<5 ppm between 2.8 to 11 μm, <20 ppm between 11 and 20 μm). A Lyot-coronagraph-based tip–tilt sensor located in the instrument fore-optics uses the light reflected by a field stop, which corresponds to 0.3% of the light from the target, to send fine pointing information to the field steering mirror in the Origins telescope. An additional MISC Wide Field Imager (WFI) is studied as an upscope option for the Origins. MISC-WFI offers a wide field imaging (3 ′ × 3 ′ ) and low-resolution spectroscopic capability with filters and grating-prisms (grisms) covering 5 to 28 μm. The imaging capability of the MISC-WFI will be used for general science objectives. The low-resolution spectroscopic capability in MISC-WFI with a resolving power R ( = λ / Δλ) of a few hundreds will be used to measure the mid-infrared dust features and ionic lines at z up to ∼1 in the Origins mission’s Rise of Metals and Black Hole Feedback programs. The MISC-WFI also serves as a focal plane pointing and guiding instrument for the observatory, including when the MISC-T channel is performing its exoplanet spectroscopy observations.

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Proceedings Article | 28 December 2020 Poster + Presentation + Paper

The South Africa Near-Infrared Doppler (SAND) instrument: concept and instrument design

Aoi Takahashi, Takayuki Kotani, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Motohide Tamura, Takahiro Nagayama, Mikio Kurita, Takahiro Sumi, Tomoyasu Yamamuro, Bun'ei Sato, Teruyuki Hirano, Masashi Omiya

Proceedings Volume 11447, 114473E (2020) https://doi.org/10.1117/12.2560342

KEYWORDS: Doppler effect, Stars, Planets, Telescopes, Spectroscopy, Velocity measurements, Infrared radiation, Near infrared, Infrared telescopes, Active optics

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)

Kohji Takimoto, Seung-Cheol Bang, Priyadarshini Bangale, James Bock, Asantha Cooray, Kenta Danbayashi, Richard Feder, Masaki Furutani, Kevin Gates, Ryo Hashimoto, Viktor Hristov, Arisa Kida, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Jodi-Ann Morgan, Chi Nguyen, Won-Kee Park, Dorin Patru, James Parkus, Shohta Sakai, Kei Sano, Hiroko Suzuki, Aoi Takahashi, Sohta Tatsu, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov

Proceedings Volume 11443, 114435A (2020) https://doi.org/10.1117/12.2561917

KEYWORDS: Optical testing, Calibration, Infrared backgrounds, Optical calibration, Electron beam lithography, Galactic astronomy, Atmospheric optics, Rockets, Stars, Infrared radiation

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Development of EXo-Zodiacal Infrared Telescope (EXZIT) for observation of visible and near-infrared extragalactic background light

Kei Sano, Shuji Matsuura, Kohji Tsumura, Aoi Takahashi, Ryo Hashimoto, Sota Ogura, Kazuma Yomo, Hikoma Yasutake, Yuta Ino, Reina Tanaka

Proceedings Volume 11443, 114436B (2020) https://doi.org/10.1117/12.2559169

KEYWORDS: Electron beam lithography, Visualization, Space operations, Sensors, Mirrors, Infrared telescopes, Stars, Thermography, Aerospace engineering, Geometrical optics

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Extragalactic background light (EBL) consists of entire radiation emitted throughout the cosmic history and is one crucial observable quantity to study astrophysics in the early universe, such as first stellar objects or primordial black holes. In the visible and near-infrared, zodiacal light (ZL), sunlight scattered by interplanetary dust, is the brightest foreground for observer in the near-earth orbit and its uncertainty limits accuracy of the EBL measurement. To overcome this problem, observations from heliocentric distance beyond 5 au, where the ZL is negligible, is promising. To achieve the EBL observation in deep space, we have been developing EXo- Zodiacal Infrared Telescope (EXZIT) onboard a solar sail spacecraft to Jovian Trojans planned in Japan around 2030. According to our mission study, a three-mirror reflective telescope optics design with a 90mm × 50mm effective aperture and 16 deg × 8 deg field of view (FoV) followed by a focal plane array HAWAII-2RG with a linear variable filter makes available to detect the EBL at high significance in 0.4–1.6 μm with specific wavelength resolution of ∼ 20 . In the present study, we develop test optics to demonstrate optical performance in room temperature for the future observation. By adopting only mirrors of aspherical surface, we design the optics whose aberration is minimized to show point spread function (PSF) of approximately 3 pix × 3 pix on the focal plane. The mirrors are fabricated by machining aluminum alloy A6061 with a honeycomb processing on the back surface to reduce the mirror mass. After integrating and aligning the mirrors with support jigs, we measure the PSF on the focal plane by a visible camera by inserting collimated beam of different angle of incidence, covering the whole FoV. We evaluate the PSF size by analyzing encircled energy in comparison with that expected from the ray-trace simulation of the optics. Throughout the FoV of the optics, the measured PSF size is comparable to the simulation. The present study demonstrates the precision machining of the aspherical mirrors and the optical performance of the designed optics. As a next step, we plan to develop thermal structure of EXZIT to demonstrate the optical performance in low temperature.

Proceedings Article | 24 July 2018 Presentation + Paper

The mid-infrared imager, spectrometer, coronagraph (MISC) for the Origins Space telescope (OST)

Itsuki Sakon, Thomas Roellig, Kimberly Ennico-Smith, Taro Matsuo, Yuji Ikeda, Tomoyasu Yamamuro, Naofumi Fujishiro, Keigo Enya, Aoi Takahashi, Takehiko Wada, Olivier Guyon, Takayuki Kotani, Jun Nishikawa, Naoshi Murakami, Yuki Sarugaku, Denis Burgarella

Proceedings Volume 10698, 1069817 (2018) https://doi.org/10.1117/12.2314177

KEYWORDS: Spectroscopy, Coronagraphy, Space telescopes, Imaging systems, Mid-IR, Imaging spectroscopy, Exoplanets, Sensors, Telescopes

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The Mid-infrared Imager, Spectrometer, Coronagraph (MISC) is one of the instruments studied both for the Origins Space Telescope (OST) Mission Concept 1 and 2. The MISC for OST Mission Concept 1 consists of the MISC imager and spectrometer module (MISC I and S), the MISC coronagraph module (MISC COR) and the MISC transit spectrometer module (MISC TRA). The MISC I and S offers (1) a wide field (3 arcminx3 arcmin) imaging and low-resolution spectroscopic capability with filters and grisms for 6-38 μm, (2) a medium-resolution (R~1,000) Integral Field Unit (IFU) spectroscopic capability for 5- 38 μm and (3) a high-resolution (R~25,000) slit spectroscopic capability for 12-18 μm and 25-36 μm. The MISC COR module employs PIAACMC coronagraphy method and covers 6-38 μm achieving 10-7 contrast at 0.5 arcsec from the central star. The MISC TRA module employs a densified pupil spectroscopic design to achieve 3-5 ppm of spectro-photometric stability and covers 5-26 μm with R=100-300. The MISC for OST Mission Concept 2 consists of the MISC wide field imager module (MISC WFI) and the MISC transit Spectrometer module (MISC TRA). The MISC WFI offers a wide field (3 arcmin ×3 arcmin) imaging and low-resolution spectroscopic capabilities with filters and grisms for 6-28μm. The MISC TRA module in the OST Mission Concept 2 also employs the densified pupil spectroscopic design to achieve <5 ppm of spectro-photometric stability and covers 4-22 μm with R=100-300. The highest ever spectrophotometric stability achieved by MISC TRA enables to detect bio-signatures (e.g., ozone, water, and methane) in habitable worlds in both primary and secondary transits of exoplanets and makes the OST a powerful tool to bring an revolutionary progress in exoplanet sciences. Combined with the spectroscopic capability in the FIR provided by other OST instruments, the MISC widens the wavelength coverage of OST down to 5μm, which makes the OST a powerful tool to diagnose the physical and chemical condition of the ISM using dust features, molecules lines and atomic and ionic lines. The MISC also provides the OST with a focal plane guiding function for the other OST science instruments as well as its own use.

Proceedings Article | 10 July 2018 Paper

PIAA coronagraph for Origins Space telescope (OST) mid-infrared imager, spectrometer, coronagraph (MISC) instrument

N. Fujishiro, I. Sakon, K. Enya, O. Guyon, J. Nishikawa, N. Murakami, T. Kotani, M. Tamura, A. Takahashi, T. Roellig, K. Ennico-Smith

Proceedings Volume 10706, 107065N (2018) https://doi.org/10.1117/12.2313066

KEYWORDS: Coronagraphy, Apodization, Mirrors, Geometrical optics, Space telescopes, Segmented mirrors, Mid-IR, Diffraction, Imaging systems, Spectroscopy

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Proceedings Article | 6 July 2018 Paper

Development of data storage system and GSE for cosmic infrared background experiment 2 (CIBER-2)

Won-Kee Park, Seung-Chul Bang, John Battle, James Bock, Asantha Cooray, Kenta Danbayashi, Ambar DeSantiago, Viktor Hristov, Tomoya Kojima, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Jared Loewenthal, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Chi Nguyen, Ryo Ohta, Dorin Patru, Mark Peyer, Kei Sano, Aoi Takahashi, Kohji Takimoto, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov

Proceedings Volume 10698, 1069849 (2018) https://doi.org/10.1117/12.2313184

KEYWORDS: Data acquisition, Electronics, Infrared backgrounds, Image sensors, Control systems, Rockets, Infrared detectors, Infrared astronomy, Software development

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Proceedings Article | 6 July 2018 Paper

Integration and instrument characterization of the cosmic infrared background experiment 2 (CIBER-2)

Chi Nguyen, Benjamin Stewart, Seung-Cheol Bang, James Bock, Asantha Cooray, Kenta Danbayashi, Ambar DeSantiago, Viktor Hristov, Tomoya Kojima, Phillip Korngut, Kevin Kruse, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Jared Loewenthal, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Ryo Ohta, Christian Pape, Won-Kee Park, Dorin Patru, James Parkus, Kei Sano, Aoi Takahashi, Mark Peryer, Kohji Takimoto, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov

Proceedings Volume 10698, 106984J (2018) https://doi.org/10.1117/12.2311595

KEYWORDS: Sensors, Rockets, Stars, Telescopes, Electronics, Cryogenics, Electron beam lithography, Data acquisition, Space telescopes

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Proceedings Article | 12 September 2014 Paper

A monolithic deformable mirror with latchable mechanical actuation (LATCHAMAN) for space-borne telescopes

Keigo Enya, Hirokazu Kataza, Mitsuhiro Fukushima, Kenji Mitsui, Norio Okada, Hikaru Iwashita, Kanae Haze, Aoi Takahashi, Takayuki Kotani, Tomoyasu Yamamuro, Hitomi Kobayashi

Proceedings Volume 9219, 92190P (2014) https://doi.org/10.1117/12.2075454

KEYWORDS: Mirrors, Space telescopes, Telescopes, Exoplanets, Prototyping, Stars, Wavefronts, Aluminum, Infrared telescopes, Deformable mirrors

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