Personal Information|


    Name: Ryuki Hyodo / 兵頭龍樹, Ph.D. (2016)
    Affiliation: ISAS/JAXA, ELSI/Tokyo-Tech
    Position: International Top Young Fellow, ITYF (equiv. Associate Professor; 准教授相当)
    My latest curriculum vitae (CV) is available HERE (updated 2021/3/30)


    2023 「S-Booster 最優秀賞」&「S-Booster NEDO賞」, S-Booster 2023
    2023 「立教大学教育活動特別賞」, Rikkyo University
    2022 「JAXA理事長賞 / President Award」, JAXA
    2022 「最優秀研究者賞 / Outstanding Young Scientist Award」, The Japanese Society for Planetary Sciences (JSPS)
    2019 「JAXA理事長賞 / President Award」, JAXA
    2017 「学長賞 / The President Award」, Kobe University
    2016 「最優秀発表賞 / Best Research Presentation Award」, The Japanese Society for Planetary Sciences (JSPS)
    2016 「学長賞 / The President Award」, Kobe University


    FY2024-FY2025 国際共同研究加速基金(国際共同研究強化), 「進化する原始惑星系円盤における微惑星形成の理論研究:内惑星領域から外惑星領域まで」, 12,000,000 JPY (PI)
    FY2022-FY2025 科学研究費補助金 若手研究, 「進化する原始惑星系円盤における微惑星形成の理論研究」, 3,600,000 JPY (PI)
    FY2021-FY2025 科学研究費補助金 基盤A, 「岩石・氷・ガス惑星の衛星形成の総合的モデル:太陽系、系外惑星系」, 32,100,000 JPY (Co-PI)
    FY2021-FY2025 科学研究費補助金 基盤A, 「火星衛星の形成過程を解明する」, 32,100,000 JPY (Co-PI)
    FY2020-FY2025 国際共同研究加速基金 (国際共同研究強化(B)), 「火星衛星の形成過程を解明する」, 18,720,000 JPY (Co-PI)
    FY2019-FY2024 JAXA ITYF Program Incentives, 12,500,000 JPY (PI)
    FY2018-FY2021 科学研究費補助金 若手研究, 「多様な地球型惑星が持つ衛星系の起源・進化の統一的理解に向けた理論研究」, 4,160,000 JPY (PI)
    FY2017-FY2018 学振(二国間交流事業)・SAKURAプログラム, 「地球型惑星における巨大天体衝突と衛星形成過程の解明」, 1,900,000 JPY (Co-PI)
    FY2017-FY2017 NINS・ABC Project / NINS・ABCプロジェクト,「巨大天体衝突による連惑星形成の可能性について」, 2,100,000 JPY (Co-PI)
    FY2017-FY2019 JSPS Research Fellow / 特別研究員奨励費 (PD), 「多様なリング-衛星系の起源・進化の統一的理解に向けた理論研究」, 4,810,000 JPY (PI)
    FY2015-FY2016 JSPS Research Fellow / 特別研究員奨励費 (DC2),「惑星が持つ衛星-リング系の多様性:その起源と進化の理論的研究」, 1,900,000 JPY (PI)


    Rikkyo University (立教大学), 全学共通科目(全カリ)「地球の理解」
    -- 2020年度前期, 2021年度前期, 2022年度前期, 2023年度前期 --

    Refereed Publications|

    43 publications (21 as the first author)
    6 publications in Nature / Science publishing group (3 as the first author)

    [43] Hirata. K., Usui. T., Hyodo R. et al. (2024). "Mixing model of Phobos’ bulk elemental composition for the determination of its origin: Multivariate analysis of MMX/MEGANE data". Icarus accepted
          arXiv:2311.15676   Icarus 410, 115891

    [42] Madeira G., Charnoz S., Zhang Y., Hyodo R., Michel P., Genda H., Winter S.G. (2023). "Exploring the recycling model of Phobos formation: rubble-pile satellites". AJ 165 161
          arXiv:2302.12556   AJ 165 161

    [41] Madeira G., Charnoz S. & Hyodo R. (2023). "Dynamical origin of Dimorphos from fast spinning Didymos". Icarus 394, 115428
          arXiv:2301.02121   Icarus 394, 115428

    [40] Okuya A., Ida S., Hyodo R., & Okuzumi S. (2023). "Modelling the evolution of silicate/volatile accretion discs around white dwarfs". MNRAS 519, 1657
          arXiv:2211.16797   MNRAS 519, 1657

    [39] Liang Y. & Hyodo R. (2023). "Giga-year dynamical evolution of particles around Mars". Icarus 391, 115335
          arXiv:2211.00220   Icarus, 391, 115335

    [38] Hyodo R. and Sugiura, K. (2022). "Formation of moons and equatorial ridge around top-shaped asteroids after surface landslide". ApJL, 937, L36
          arXiv:2209.07045   ApJL, 937, L36

    [37] Nakamura T., Matsumoto M., Amano K., et al. (inc.Hyodo, R.) (2022). "Formation and evolution of Cb-type asteroid Ryugu: Direct evidence from returned samples". Science 379, eabn8671
          Science 379, eabn8671  

    [36] Hyodo R., Genda H., Sekiguchi R., Madeira G., Charnoz S. (2022). "Challenges in forming Phobos and Deimos directly from a splitting of an ancestral single moon". Planet. Sci. J. 3, 204
          arXiv:2208.04794   PSJ, 3, 204

    [35] Ozaki N., Yanagida K., Chikazawa T., Takeishi N. & Hyodo R. (2022). "Asteroid Flyby Cycler Trajectory Design Using Deep Neural Networks". JGCD, 0 0:0, 1-16
          arXiv:2111.11858   JGCD, 0 0:0, 1-16

    [34] Hyodo R., Ida S., Guillot T. (2022). "A "no-drift" runaway pile-up of pebbles in protoplanetary disks II. Characteristics of the resulting planetesimal belt". A&A, 660, A117
          arXiv:2202.04143   A&A, 660, A117

    [33] Barucci M.A., Reess J.M., Bernardi P., et al. (inc.Hyodo, R.) (2021). "MIRS: an imaging spectrometer for the MMX mission". Earth, Planets and Space, 73, 211
          Earth, Planets and Space, 73, 211  

    [32] Hyodo R. & Usui T. (2021). "Searching for life in Mars and its moons". Science 373, 742
          Science 373, 742  

    [31] Arakawa S., Hyodo R., Shoji D. & Genda H. (2021). "Tidal evolution of the eccentric moon around dwarf planet (225088) Gonggong". AJ, 162, 226
          arXiv:2108.08553   AJ 162 226

    [30] Hyodo R. & Genda H. (2021). "Erosion and accretion by cratering impacts on rocky and icy bodies". ApJ, 913, 77
          arXiv:2104.04981   ApJ, 913, 77

    [29] Charnoz S., Avice G., Hyodo R., Pignatale F.C., & Chaussidon M. (2021). "Forming pressure-traps at the snow-line to isolate isotopic reservoirs in the absence of a planet". A&A, 652, A35
          arXiv:2105.00456   A&A, 652, A35

    [28] Sugiura K., Kobayashi H., Watanabe S., Genda, H., Hyodo R. & Inutsuka S. (2021). "SPH simulations for shape deformation of rubble-Pile asteroids through spinup: the challenge for making top-shaped asteroids Ryugu and Benue". Icarus, 365, 114505
          arXiv:2104.13516   Icarus, 365, 114505

    [27] Charnoz S., Sossi A.P., Lee YN., Siebert J., Hyodo R., Allibert L., Pignatale FC., Landeau M., Oza A.V. & Moynier F. (2021). "Tidal pull of the Earth strips the proto-Moon of its volatiles". Icarus, 364, 114451
          arXiv:2105.00917   Icarus, 364, 114451

    [26] Hyodo R., Ida S., Guillot T. (2021). "A "no-drift" runaway pile-up of pebbles in protoplanetary disks in which midplane turbulence increases with radius". A&A, 645, L9
          arXiv:2012.12511   A&A, 645, L9

    [25] Hyodo R., Guillot T., Ida S., Okuzumi S. and Youdin A. (2021). "Planetesimal formation around the snow line. II. Dust or pebbles?". A&A, 646, A14
          arXiv:2012.06700   A&A, 646, A14

    [24] Ida S., Guillot T., Hyodo R., Okuzumi S. and Youdin A. (2021). "Planetesimal formation around the snow line. I. Monte Carlo simulations of silicate dust pile-up in a turbulent disk". A&A, 646, A13
          arXiv:2011.13164   A&A, 646, A13

    [23] Hyodo, R., Genda, H. & Brasser, R. (2021). "Modification of the composition and density of Mercury from late accretion". Icarus, 354, 114064
          arXiv:2008.08490   Icarus

    [22] Hyodo, R. & Genda, H. (2020). "Escape and accretion by cratering impacts: Formulation of scaling relations for high-speed ejecta". ApJ, 898, 30
          arXiv:2006.00732   ApJ, 898, 30

    [21] Rothery D., Massironi M., Alemanno G., et al. (inc.Hyodo, R.) (2020). "Rationale for BepiColombo Studies of Mercury's Surface and Composition". Space Science Reviews 216, 66
         Space Science Reviews 216, 66

    [20] Rosenblatt P., Hyodo R., Pignatale F., Charnoz S., Trinh A., Dunseath-Terao M., Dunseath K.M., Genda H. (2020). “The formation of the Martian moons”, Oxford Science Encyclopedia
          arXiv:1909.03996   Oxford Science Encyclopedia

    [19] Hyodo, R., Kurosawa, K., Genda, H., Usui, T. & Fujita, K. (2019). "Transport of impact ejecta from Mars to its moons as a means to reveal Martian history", Scientific Reports 9, 19833
          arXiv:1912.12056   Scientifc Reports 9, 19833

    [18] Fujita, K., Kurosawa, K., Genda, H., Hyodo, R., Matsuyama, S., Yamagishi, A., Mikouchi, T., and Niihara, T. (2019). "Assessment of microbial contamination probability for sample return from martian moons I: The departure of the microbes from Martian surface". Life Sciences in Space Research 23, 73-84
          arXiv:1907.07575   Life Sciences in Space Research 23, 73-84

    [17] Hyodo, R., Ida, S., Charnoz, S. (2019). "Formation of rocky and icy planetesimals inside and outside the snow lin: Effects of diffusion, sublimation and back-reaction". A&A, A90, 13
          arXiv:1907.04621   A&A, A90, 13

    [16] Kurosawa, K., Genda, H., Hyodo, R., Yamagishi, A., Mikouchi, T., Niihara, T., Matsuyama, S. and Fujita, K. (2019). "Assessment of the probability of microbial contamination for sample return from Martian moons II: The fate of microbes on Martian moons". Life Sciences in Space Research 23, 85-100
          arXiv:1907.07576   Life Sciences in Space Research 23, 85-100

    [15] Arakawa, S., Hyodo, R., Genda, H. (2019). "Early formation of moons around large trans Neptunian objects via giant impact". Nature Astronomy, 3, 802-807
          arXiv:1906.10833   Nature Astronomy, 3, 802-807

    [14] Charnoz, S., Pignatale, F., Hyodo, R., Mahan, B., Chaussidon, M., Siebert, J., Moynier, M. (2019). "Planetesimal formation in an evolving protoplanetary disk with a dead zone". A&A 627, A50
          A&A, 627, A50

    [13] Hyodo, R., Genda, H., Charnoz, S., Pignatale, F., Rosenblatt, P. (2018). "On the Impact Origin of Phobos and Deimos. IV. Volatile depletion". ApJ, 860, 150
          arXiv:1804.08889   ApJ, 860, 150  

    [12] Hyodo, R. & Genda, H. (2018). "Implantation of Martian materials in the inner solar system by a mega impact on Mars". ApJL 856, 2
          arXiv:1803.07196   ApJL, 856, 2  

    [11] Charnoz, S., Crida, A., Hyodo, R. (2018). "Rings in the Solar System: a short review". Handbook of Exoplanets
          arXiv:1805.08963   Handbook of Exoplanets  

    [10] Pignatale, F., Charnoz, S., Rosenblatt, P., Hyodo, R., Nakamura, T., Genda, H. (2018). "On the Impact Origin of Phobos and Deimos. Ⅲ. resulting composition from different impactors". ApJ, 853, 118
          arXiv:1712.05154   ApJ, 853, 2  

    [9] Hyodo, R., Rosenblatt, P., Genda, H., Charnoz, S., (2017). "On the Impact Origin of Phobos and Deimos. Ⅱ. True polar wande rand disk evolution". ApJ 851, 122
          arXiv:1711.02334   ApJ, 851 122  

    [8] Hyodo, R., Genda, H., Charnoz, S., & Rosenblatt, P., (2017). "On the Impact Origin of Phobos and Deimos. I. Thermodynamic and Physical Aspects". ApJ, 845, 125
          arXiv:1707.06282   ApJ, 845, 125

    [7] Hyodo, R. & Charnoz, S. (2017). "Dynamical Evolution of the Debris Disk after a Satellite Catastrophic Disruption around Saturn". AJ, 154, 34
          arXiv:1705.07554   AJ, 154, 34

    [6] Hyodo, R., Charnoz, S., Ohtsuki, K. & Genda, H. (2017). "Ring formation around giant planets by a single encounter of Kuiper belt object". Icarus, 282, 195-213
          arXiv:1609.02396   Icarus, 282, 159-213

    [5] Hyodo, R., Charnoz, S., Genda, H. & Ohtsuki, K. (2016). "Formation of Centaurs' Rings through Their Partial Tidal Disruption during Planetary Encounters". Astrophys. J. Letters, 828, L8
          arXiv:1608.03509   ApJL, 828, L8   ADS

    [4] Rosenblatt, P., Charnoz, S., Dunseath, K.M., Terao-Dunseath, M., Trinh, A., Hyodo, R., Genda, H., & Toupi, S., (2016). "Accretion of Phobos and Deimos in an extended debris disc stirred by transient moons". Nature Geoscience, 9, 581
          Nature Geo. 9. 581   ADS

    [3] Hyodo, R. & Ohtsuki, K., (2015). "Saturn's F ring and shepherd satellites a natural outcome of satellite system formation". Nature Geoscience, 8, 686-689
          Nature Geo. 8, 686-689   ADS

    [2] Hyodo, R., Ohtsuki, K., Takeda, T., (2015). "Formation of multiple-satellite systems from low-mass circumplanetary particle disks". Astrophys. J., 799, 40
          arXiv:1411.4336   ApJ, 799, 40   ADS

    [1] Hyodo, R. & Ohtsuki, K., (2014). "Collisional Disruption of Gravitational Aggregates in the Tidal Environment". Astrophys. J., 787, 56
          ApJ, 787, 56   ADS

    Refereed Publications (Japanese)|

    [4] 兵頭龍樹 (2023) "惑星形成理論×惑星探査に関するある取り組み" 遊星人 32, 4-15.

    [3] 荒川創太, 兵頭龍樹, 庄司大悟, 玄田英典 (2020) "太陽系外縁天体の衛星形成と潮汐進化" 遊星人 29, 104-114.

    [2] 兵頭龍樹, 玄田英典 (2018) "火星衛星フォボスとデイモスの起源・進化の現状理解" 遊星人 27, 216-223.

    [1] 兵頭龍樹, Sébastien Charnoz, 大槻圭史, 玄田英典 (2017) "多様な巨大惑星リングの形成過程について" 遊星人 26, 82-91.


    NASA Proposal
    Nature Geoscience
    Nature Astronomy
    Nature Communications
    Science Advances
    Astronomy & Astrophysics (A&A)
    Astrophysical Journal (ApJ)
    Astronomical Journal (AJ)
    Planetary Science Journal (PSJ)
    Monthly Notices of the Royal Astronomical Society (MNRAS)
    Earth, Moon, and Planets

    iPhone Apps|

    [1] Kepler Motion (Expired), Ryuki Hyodo - 2014
          iTunes preview