Associate for Education and Public Outreach

Mizuho Uchiyama

  (内山 瑞穂)

Profile Information

Affiliation
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Degree
博士(理学)(東京大学大学院)

Researcher number
70795624
ORCID ID
 https://orcid.org/0000-0002-6681-7318
J-GLOBAL ID
201801011232252049
researchmap Member ID
B000318417

赤外線天文学、観測装置開発、星形成(大質量星)、時間天文学

Major Papers

 39
  • Uchiyama, Mizuho, Yamashita, Takuya, Sugiyama, Koichiro, Nakaoka, Tatsuya, Kawabata, Miho, Itoh, Ryosuke, Yamanaka, Masayuki, Akitaya, Hiroshi, Kawabata, Koji, Yonekura, Yoshinori, Saito, Yu, Motogi, Kazuhito, Fujisawa, Kenta
    Publications of the Astronomical Society of Japan, Feb 1, 2020  Peer-reviewed
    <jats:title>Abstract</jats:title> <jats:p>We followed up the massive young stellar object S255-NIRS3 (= S255-IRS1b) during its recent accretion outburst event in the $K_{\rm s}$ band with Kanata/HONIR for four years after its burst and obtained a long-term light curve. This is the most complete near-infrared light curve of the S255-NIRS3 burst event that has ever been presented. The light curve showed a steep increase reaching a peak flux that was 3.4 mag brighter than the quiescent phase and then a relatively moderate year-scale fading until the last observation, similar to that of the accretion burst events such as EXors found in lower-mass young stellar objects. The behavior of the $K_{\rm s}$-band light curve is similar to that observed in 6.7 GHz class II methanol maser emission, with a sudden increase followed by moderate year-scale fading. However, the maser emission peaks appear 30–50 d earlier than that of the $K_{\rm s}$ band emission. The similarities confirmed that the origins of the maser emission and the $K_{\rm s}$-band continuum emission are common, as previously shown from other infrared and radio observations by Stecklum et al. (2016, Astronomer’s Telegram, 8732), Caratti o Garatti et al. (2017b, Nature Phys., 13, 276), and Moscadelli et al. (2017, A&amp;A, 600, L8). However, the differences in energy transfer paths, such as the exciting/emitting/scattering structures, may cause the delay in the flux-peak dates.</jats:p>
  • Mizuho Uchiyama, Kohei Ichikawa
    The Astrophysical Journal, 883(1) 6-6, Sep 17, 2019  Peer-reviewed
  • Mizuho Uchiyama, Takashi Miyata, Shigeyuki Sako, Takafumi Kamizuka, Tomohiko Nakamura, Kentaro Asano, Kazushi Okada, Takashi Onaka, Itsuki Sakon, Hirokazu Kataza, Yuki Sarugaku, Okiharu Kirino, Hiroyuki Nakagawa, Norio Okada, Kenji Mitsui
    ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION, 9151(915143) 9, 2014  
    We report the restraint deformation and the corrosion protection of gold deposited aluminum mirrors for mid-infrared instruments. To evaluate the deformation of the aluminum mirrors by thermal shrinkage, monitoring measurement of the surface of a mirror has been carried out in the cooling cycles from the room temperature to 100 K. The result showed that the effect of the deformation was reduced to one fourth if the mirror was screwed with spring washers. We have explored an effective way to prevent the mirror from being galvanically corroded. A number of samples have been prepared by changing the coating conditions, such as inserting an insulation layer, making a multi-layer and over-coating water blocking layer, or carrying out precision cleaning before coating. Precision cleaning before the deposition and protecting coat with SiO over the gold layer seemed to be effective in blocking corrosion of the aluminum. The SiO over-coated mirror has survived the cooling test for the mid-infrared use and approximately 1 percent decrease in the reflectance has been detected at 6-25 microns compared to gold deposited mirror without coating.

Misc.

 29
  • 和田武彦, 金田英宏, 金田英宏, 石原大助, 長勢晃一, 内山瑞穂, 伊藤哲司, 國生拓摩, 平原靖大, 土川拓朗, 前嶋宏志, 前嶋宏志, 大西崇介, 大西崇介, 松本光生, 松本光生, HUANG Ting-Chi, HUANG Ting-Chi, 榎木谷海, 榎木谷海, 海老原大路, 海老原大路, 笠羽康正, 坂野井健, 大薮進喜, 鈴木仁研, 中川貴雄, 松原英雄, 山岸光義, WANG Shiang-Yu, 大山陽一
    日本天文学会年会講演予稿集, 2021, 2021  
  • Takehiko Wada, Hidehiro Kaneda, Takuma Kokusho, Toyoaki Suzuki, Kumiko Morihana, Takurou Tsuchikawa, Yuki Kuroda, Daichi Ishikawa, Shinki Oyabu, Naoki Isobe, Daisuke Ishihara, Hideo Matsuhara, Koichi Nagase, Takao Nakagawa, Takafumi Ootsubo, Mitsuyoshi Yamagishi, Hiroshi Maeshima, Shunsuke Onishi, Kosei Matsumoto, Satoshi Itoh, Mizuho Uchiyama, Ryan Lau, Hiromichi Ebihara, Hanae Inami, Koji Kawabata, Yasumasa Kasaba, Takeshi Sakanoi, Yoshifusa Ita, Masayuki Akiyama, Itsuki Sakon, Takafumi Kamizuka, Takashi Miyata, Kohji Tsumura, Masato Naruse, Youichi Ohyama, Shiang-Yu Wang, Hiroshi Shibai
    Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, Dec 13, 2020  
  • 大薮進喜, 金田英宏, 金田英宏, 和田武彦, 石原大助, 長勢晃一, 内山瑞穂, 伊藤哲司, 國生拓摩, 平原靖大, 前嶋宏志, 前嶋宏志, 笠羽康正, 坂野井健, 鈴木仁研, 中川貴雄, 松原英雄, 山岸光義, WANG Shiang-Yu, 大山陽一
    日本天文学会年会講演予稿集, 2020, 2020  
  • Nakamura Tomohiko, Miyata Takashi, Sako Shigeyuki, Kamizuka Takafumi, Asano Katsuaki, Uchiyama Mizuho, Onaka Takashi, Ita Yoshifusa, Yoneda Mizuki, Kataza Hirokazu
    (17) 249-251, Mar 9, 2018  
    SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, JapanWe present a result of high-resolution 30 μm imaging observations of the Homunculus Nebula of Eta Carinae (η Car). The Homunculus Nebula is known to contain a large amount of cool dust (approximately 100 K) at polar lobes and a equatorial torus. While the distribution of the cool dust shows the past dust formation events on Car such as giant eruptions and binary interactions, no spatially resolved images at long mid-infrared wavelengths (30-50 μm) have been obtained. We observed Car with a mid-infrared camera MAX38 on the University of Tokyo Atacama 1.0-m telescope, and successfully obtained spatially resolved images of the Homunculus Nebula at 18.7, 31.7 and 37.3 μm. The observations revealed the structure of the massive equatorial torus which contains the dust of 0.09 solar mass. This amount is equal to approximately 80% of the total dust mass 0.12 solar mass in the Homunculus Nebula. It is also found that the dust of 0.012 solar mass exists inside the polar lobes. Assuming that the dust was constantly formed after the giant eruption occurred in 1843, the dust formation rate is estimated as 7 × 10(exp -5)solar mass yr(exp -1). This indicates that the binary interaction plays a significant role in the dust formation on Car.Number of authors: 29Physical characteristics: Original contains color illustrations
  • 小西真広, 本原顕太郎, 高橋英則, 加藤夏子, 舘内謙, 北川祐太朗, 藤堂颯哉, 小早川大, 吉井讓, 土居守, 河野孝太郎, 川良公明, 田中培生, 宮田隆志, 田辺俊彦, 峰崎岳夫, 酒向重行, 諸隈智貴, 田村陽一, 青木勉, 征矢野隆夫, 樽沢賢一, 上塚貴史, 大澤亮, 浅野健太朗, 内山瑞穂, 岡田一志, 内山允史, 半田利弘, 越田進太郎
    日本天文学会年会講演予稿集, 2015, 2015  

Presentations

 2