Masahiro IKOMA

Profile Information

Affiliation: Professor, Division of Science, National Astronomical Observatory of Japan
: Professor, Graduate School of Science , The University of Tokyo
: Professor, Graduate Institute for Advanced Studies, The Graduate University for Advanced Studies

Degree: Doctor of Science(Mar, 2001, Tokyo Institute of Technology)

J-GLOBAL ID: 200901087581856314
researchmap Member ID: 5000085862

Research Interests

Research Areas

Research History

Apr, 2024 - Present

Director of Research Coordination, Board, National Astronomical Observatory of Japan
Oct, 2022 - Present

Professor, Graduate School of Science, The University of Tokyo
Apr, 2021 - Present

The Graduate University for Advanced Studies
Apr, 2021 - Present

Professor, Division of Science, National Astronomical Observatory of Japan
Apr, 2022 - Mar, 2024

Director, Division of Science, National Astronomical Observatory of Japan
Feb, 2012 - Mar, 2021

Associate Professor, University of Tokyo
Mar, 2007 - Jan, 2012

Assistant Professor, Tokyo Tech
Nov, 2004 - Feb, 2007

Graduate School of Science and Engineering, Tokyo Institute of Technology
Apr, 2001 - Oct, 2004

Graduate School of Science and Engineering, Tokyo Institute of Technology

Education

Awards

May, 2017

Nishida Prize for Promotion of Geo- and Planetary Science, Theoretical studies on the formation process of giant planets and the application to exoplanets, Japan Geoscience Union

Masahiro IKOMA
Apr, 2012

科学技術分野の文部科学大臣表彰若手科学者賞, 巨大惑星の起源と内部構造の研究, 文部科学省

生駒大洋
Aug, 2011

挑戦的研究賞, 東京工業大学

生駒大洋
Nov, 2008

最優秀研究者賞, 日本惑星科学会

生駒大洋

Papers

TOI 4201 b and TOI 5344 b: Discovery of Two Transiting Giant Planets around M-dwarf Stars and Revised Parameters for Three Others

J. D. Hartman, G. I. Bakos, Z. Csubry, A. W. Howard, H. Isaacson, S. Giacalone, A. Chontos, N. Narita, A. Fukui, J. P. de Leon …

Astronomical Journal, 166(4), Oct 1, 2023
An M dwarf accompanied by a close-in giant orbiter with SPECULOOS

Amaury H.M.J. Triaud, Georgina Dransfield, Taiki Kagetani, Mathilde Timmermans, Norio Narita, Khalid Barkaoui, Teruyuki Hirano, Benjamin V. Rackham, Mayuko Mori, Thomas Baycroft …

Monthly Notices of the Royal Astronomical Society: Letters, 525(1) L98-L104, Oct 1, 2023
Two sub-Neptunes around the M dwarf TOI-1470

E. González-Álvarez, M. R. Zapatero Osorio, J. A. Caballero, V. J.S. Béjar, C. Cifuentes, A. Fukui, E. Herrero, K. Kawauchi, J. H. Livingston, M. J. López-González …

Astronomy and Astrophysics, 675, Jul 1, 2023
The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

Taiki Kagetani, Norio Narita, Tadahiro Kimura, Teruyuki Hirano, Masahiro Ikoma, Hiroyuki Tako ISHIKAWA, Steven Giacalone, Akihiko Fukui, Takanori Kodama, Rebecca Gore …

Publications of the Astronomical Society of Japan, May 19, 2023 Peer-reviewed
TOI-1442 b and TOI-2445 b: Two potentially rocky ultra-short period planets around M dwarfs

G. Morello, H. Parviainen, F. Murgas, E. Pallé, M. Oshagh, A. Fukui, T. Hirano, H. T. Ishikawa, M. Mori, N. Narita …

Astronomy and Astrophysics, 673, May 1, 2023
An Earth-sized Planet around an M5 Dwarf Star at 22 pc

Teruyuki Hirano, John Livingston, Sascha Grziwa, Kristine W. F. Lam, Yui Kasagi, Norio Narita, Hiroyuki Tako ISHIKAWA, Kohei Miyakawa, Luisa Maria Serrano, Yuji Matsumoto …

The Astronomical Journal, 165(3) 131-131, Mar 1, 2023
Predicted diversity in water content of terrestrial exoplanets orbiting M dwarfs

Tadahiro Kimura, Masahiro Ikoma

Nature Astronomy, Nov 30, 2022 Peer-reviewedLast authorCorresponding author
Two temperate super-Earths transiting a nearby late-type M dwarf

L. Delrez, C. A. Murray, F. J. Pozuelos, N. Narita, E. Ducrot, M. Timmermans, N. Watanabe, A. J. Burgasser, T. Hirano, B. V. Rackham …

Astronomy & Astrophysics, 667 A59-A59, Nov, 2022 Peer-reviewed
Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf

K. Kawauchi, F. Murgas, E. Palle, N. Narita, A. Fukui, T. Hirano, H. Parviainen, H. T. Ishikawa, N. Watanabe, E. Esparaza-Borges …

Astronomy & Astrophysics, 666 A4-A4, Oct, 2022 Peer-reviewed
Survival of Terrestrial N₂–O₂ Atmospheres in Violent XUV Environments through Efficient Atomic Line Radiative Cooling

Akifumi Nakayama, Masahiro Ikoma, Naoki Terada

The Astrophysical Journal, 937(2) 72-72, Oct 1, 2022 Peer-reviewed
A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs Color validation of TOI-4479b and TOI-2081b

E. Esparza-Borges, H. Parviainen, F. Murgas, E. Palle, A. Maas, G. Morello, M. R. Zapatero-Osorio, K. Barkaoui, N. Narita, A. Fukui …

ASTRONOMY & ASTROPHYSICS, 666, Sep, 2022 Peer-reviewed
TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf

Charles Cadieux, Rene Doyon, Mykhaylo Plotnykov, Guillaume Hebrard, Farbod Jahandar, Etienne Artigau, Diana Valencia, Neil J. Cook, Eder Martioli, Thomas Vandal …

ASTRONOMICAL JOURNAL, 164(3), Sep, 2022 Peer-reviewed
Less Effective Hydrodynamic Escape of H₂–H₂O Atmospheres on Terrestrial Planets Orbiting Pre-main-sequence M Dwarfs

Tatsuya Yoshida, Naoki Terada, Masahiro Ikoma, Kiyoshi Kuramoto

The Astrophysical Journal, 934(2) 137-137, Aug 1, 2022 Peer-reviewed
TOI-1696: A Nearby M4 Dwarf with a 3 R_⊕ Planet in the Neptunian Desert

Mayuko Mori, John H. Livingston, Jerome de Leon, Norio Narita, Teruyuki Hirano, Akihiko Fukui, Karen A. Collins, Naho Fujita, Yasunori Hori, Hiroyuki Tako Ishikawa …

The Astronomical Journal, 163(6) 298-298, Jun 1, 2022 Peer-reviewed
Five Key Exoplanet Questions Answered via the Analysis of 25 Hot-Jupiter Atmospheres in Eclipse

Changeat, Q, Edwards, B, Al-Refaie, A. F, Tsiaras, A, Skinner, J. W, Cho, J. Y. K, Yip, K. H, Anisman, L, Ikoma, M, Bieger, M. F …

The Astrophysical Journal Supplement Series, 260(1) 3-3, May 1, 2022 Peer-reviewed
A 38 Million Year Old Neptune-sized Planet in the Kepler Field

Bouma, L. G., Curtis, J. L., Masuda, K., Hillenbrand, L. A., Stefansson, G., Isaacson, H., Narita, N., Fukui, A., Ikoma, M., Tamura, M. …

The Astronomical Journal, 163(3) 121-121, Mar 1, 2022 Peer-reviewed
The origin of the high metallicity of close-in giant exoplanets. II. The nature of the sweet spot for accretion

Shibata, S, Helled, R, Ikoma, M

Astronomy & Astrophysics, 659 A28-A28, Mar, 2022 Peer-reviewedLast author
TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Akihiko Fukui, Tadahiro Kimura, Teruyuki Hirano, Norio Narita, Takanori Kodama, Yasunori Hori, Masahiro Ikoma, Enric Pallé, Felipe Murgas, Hannu Parviainen …

Publications of the Astronomical Society of Japan, 74(1) L1-L8, Dec 5, 2021 Peer-reviewed
TOI-2109: An Ultrahot Gas Giant on a 16 hr Orbit

Ian Wong, Avi Shporer, George Zhou, Daniel Kitzmann, Thaddeus D. Komacek, Xianyu Tan, René Tronsgaard, Lars A. Buchhave, Shreyas Vissapragada, Michael Greklek-McKeon …

The Astronomical Journal, 162(6) 256-256, Dec 1, 2021 Peer-reviewed
Hydrodynamic Model of Hα Emission from Accretion Shocks of a Proto-giant Planet and Circumplanetary Disk

Takasao, Y., Aoyama, Y., Ikoma, M.

The Astrophysical Journal, 921(1) 10-10, Nov 1, 2021 Peer-reviewedLast author

Misc.

すばる望遠鏡IRDによるTOI-654の視線速度の複数惑星モデリング

幾田佳, 成田憲保, 福井暁彦, 小玉貴則, 木村真博, 平野照幸, 堀安範, 小谷隆行, 生駒大洋, 田村元秀 …

日本天文学会年会講演予稿集, 2022, 2022
明るいM型星をまわる低日射の小型トランジット惑星TOI-2285bの発見

福井暁彦, 木村真博, 成田憲保, 小玉貴則, 平野照幸, 堀安範, 生駒大洋, 田村元秀, 田村元秀

日本天文学会年会講演予稿集, 2022, 2022
高金属量mid-M型星をトランジットする巨大惑星TOI-519bの質量決定

蔭谷泰希, 成田憲保, 福井暁彦, 小玉貴則, 木村真博, 平野照幸, 堀安範, 石川裕之, 小谷隆行, 小谷隆行 …

日本天文学会年会講演予稿集, 2022, 2022
MuSCATシリーズとすばる望遠鏡IRDインテンシブ観測によるTESSトランジット惑星候補のフォローアップ観測 II

成田憲保, 福井暁彦, 小玉貴則, 渡辺紀治, 木村真博, 森万由子, 蔭谷泰希, 鄒宇傑, 平野照幸, 堀安範 …

日本天文学会年会講演予稿集, 2022, 2022
MuSCATシリーズとすばる望遠鏡IRDインテンシブ観測によるTESSトランジット惑星候補のフォローアップ観測

成田憲保, 福井暁彦, 生駒大洋, 平野照幸, 小谷隆行, 小谷隆行, 田村元秀, 田村元秀, 田村元秀

日本天文学会年会講演予稿集, 2021, 2021
巨大氷惑星のサブミリ波による大気組成制約と熱進化への影響

黒崎健二, 生駒大洋

日本地球惑星科学連合大会予稿集(Web), 2019, 2019
Exoplanet Science with the SPICA Coronagraph Instrument

Kotani Takayuki, Enya Keigo, Kaneda Hidehiro, Matsuo Taro, Ikoma Masahiro, Ito Yoichi, Ida Shigeru, Haze Kanae, Oyabu Shinki, Ishihara Daisuke …

(17) 339-342, Mar 9, 2018
大気成分凝縮による巨大氷惑星の惑星放射強度と熱進化加速

黒崎健二, 生駒大洋, 生駒大洋

日本惑星科学会誌遊・星・人, 27(1), 2018
氷成分に富む巨大氷惑星の赤外放射強度

黒崎健二, 生駒大洋

日本天文学会年会講演予稿集, 2017, 2017
氷成分に富む大気を持った巨大ガス惑星の放射強度

黒崎健二, 生駒大洋

日本天文学会年会講演予稿集, 2017, 2017
大気中の氷成分凝縮がもたらす巨大氷惑星の熱進化時間の短縮効果

黒崎健二, 生駒大洋

日本天文学会年会講演予稿集, 2016, 2016
巨大氷惑星の熱進化における氷成分凝縮による熱進化への影響

黒崎健二, 生駒大洋

日本地球惑星科学連合大会予稿集(Web), 2015, 2015
大気中の氷成分凝縮がもたらす天王星熱進化問題への示唆

黒崎健二, 生駒大洋

日本惑星科学会秋季講演会予稿集(Web), 2015, 2015
P1-08 ホットネプチューンの水素ヘリウム大気量推定における内部組成分布の影響(ポスターセッション1,ポスター発表)

黒崎健二, 生駒大洋

日本惑星科学会秋期講演会予稿集, 2014 "P1-08", Sep 10, 2014
P1-05 短周期地球型惑星の大気構造と放射スペクトル(ポスターセッション1,ポスター発表)

伊藤祐一, 生駒大洋, 河原創, 永原裕子, 川島由依, 中本泰史

日本惑星科学会秋期講演会予稿集, 2014 "P1-05", Sep 10, 2014
O2-06 ヘイズを持つ系外惑星の大気透過スペクトルモデル : 温度および組成の鉛直分布の影響(口頭発表セッション2 系外惑星,口頭発表)

川島由依, 生駒大洋, 福井暁彦, 成田憲保

日本惑星科学会秋期講演会予稿集, 2014 "O2-06", Sep 10, 2014
多色測光観測によるウォームジュピターWASP‐80bの大気調査

福井暁彦, 成田憲保, 高橋安大, 黒田大介, 長山省吾, 清水康広, 柳澤顕史, 泉浦秀行, 川島由依, 生駒大洋 …

日本天文学会年会講演予稿集, 2014 169, Aug 20, 2014
DESTINY応用:紫外線望遠鏡による太陽系外惑星観測ミッション

亀田真吾, 村上豪, 成田憲保, 生駒大洋, 関根康人, 杉田精司

宇宙科学技術連合講演会講演集(CD-ROM), 58th ROMBUNNO.2B06, 2014
O3-04 M型星まわりの短周期低質量惑星の熱進化 : GJ3470bの場合(口頭発表セッション3(系外惑星),口頭発表)

黒崎健二, 生駒大洋

日本惑星科学会秋期講演会予稿集, 2013 "O3-04", Nov 20, 2013
P1-09 トランジット低質量系外惑星の透過スペクトルモデル(ポスターセッション1,ポスター発表)

川島由依, 生駒大洋

日本惑星科学会秋期講演会予稿集, 2013 "P1-09", Nov 20, 2013

Books and Other Publications

シリーズ現代の天文学９太陽系と惑星

生駒大洋 (Role: Contributor, ６章４節「木星型惑星の形成」)

日本評論社, 2008

Presentations

太陽系外惑星研究の最前線〜我々が暮らす惑星系は特殊なのだろうか〜

生駒大洋

葛飾区郷土と天文の博物館第６７回星の講演会, Nov 24, 2012 Invited
地球のような水惑星は宇宙にどれくらい存在するのか

生駒大洋

東京理科大学総合研究機構RNA科学総合研究センター公開セミナー／2012年度生命の起原および進化学会夏の学校, Jul, 2012 Invited
系外惑星について

生駒大洋

地球維新塾, Nov, 2011 Invited
スーパーアースってなに？

生駒大洋

すみだ学習ガーデンしたまち天文学, Jun, 2010 Invited

Professional Memberships

Research Projects

高層大気の広がりから太陽系外地球型惑星の表層環境を探るための理論的研究

科学研究費助成事業基盤研究(B), 基盤研究(B), 日本学術振興会, Apr, 2021 - Mar, 2024

生駒大洋
Theoretical and Observational Studies of the Formation and Evolution of Diverse Planetary Atmospheres

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Society for the Promotion of Science, Jun, 2018 - Mar, 2023
Uncovering the nature of small exoplanets via collaborations between observational and theoretical studies

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2021

NARITA Norio
Observation of Jovian surface oscillations with a Doppler imaging spectrograph: Toward an understanding of the interior and origin of Jupiter

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2021

Ikoma Masahiro
Investigating the Nature of Super-Earths via High-Precision Near-Infrared 3-color Simultaneous Transit Photometry

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, May, 2013 - Mar, 2017

Narita Norio, FUKUI Akihiko, SATO Bun' ei, TAMURA Motohide, YANAGISAWA Kenshi, NAGAYAMA Takahiro, ENYA Keigo, SEKINE Yasuhito, GENDA Hidenori, KURITA Mikio
Understanding of accretion process of atmospheres of short-period super-Earths

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2013 - Mar, 2017

Ikoma Masahiro
Formation theory of habitable terrestrial planets

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Society for the Promotion of Science, Apr, 2011 - Mar, 2016

IDA SHIGERU
Detailed studies on extrasolar-planets orbiting intermediate-mass stars based on radial velocimetry and photometry

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2011 - 2013

SATO BUNEI, IZUMIURA Hideyuki, KAMBE Eiji, ANDO Hiroyasu, TAKEDA Yoichi, NOGUCHI Kunio, YOSHIDA Michitoshi, IKOMA Masahiro, IDA Shigeru
系外惑星系における惑星大気の多様性の解明

科学研究費助成事業, 特定領域研究, 日本学術振興会, 2005 - 2006

生駒大洋
海洋形成時および生命誕生時の地球大気の形成過程

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, 2002 - 2004

生駒大洋
木星型惑星の形成

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, 2000 - 2001

生駒大洋

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Papers

Misc.

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