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About me

Welcome to my site! I am working on planetary science at University of California Santa Cruz with supported by JSPS Overseas Research Fellowships. My primary research interest is theoretical modeling of (exo)planetary atmospheres, including aerosol formation and atmospheric circulation, as well as planet formation in protoplanetary disks. I got the PhD degree of science at the Tokyo Institute of Technology March 2020 with supervision by Satoshi Okuzumi and Xi Zhang. I am currently working with Jonathan Fortney, Xi Zhang, and many other collaborators.

Affilication: University of California, Santa Cruz, Department of Astronomy and Astrophysics
Address: 1156 High Street, Santa Cruz, CA 95064, US
Email: kono2 [at] ucsc.edu

Research

I am interested in various topics of exoplanets and planet formation. My scientific goals is to figure out what physical processes are going on in exoplanetary atmospheres. This aims to better interpret atmospheric observations to explore atmospheric properties that encapusulate the information on past planet formation and evolution processes.

Microphysical Modeling of Clouds and Hazes in Exoplanetary Atmospheres

Observational efforts in the last decade have revealed that exoplanetary atmospheres are ubiquitously veiled by exotic clouds and/or hazes. It has been poorly understood how clouds and hazes form in exoplanetary atmospheres and affect atmospheric observations. I have tackled these open questions using a cloud microphysical model.

Relevant papers

  • A Condensation-coalescence Cloud Model for Exoplanetary Atmospheres: Formulation and Test Applications to Terrestrial and Jovian Clouds
  • Microphysical Modeling of Mineral Clouds in GJ1214 b and GJ436 b: Predicting Upper Limits on the Cloud-top Height
  • Clouds of Fluffy Aggregates: How They Form in Exoplanetary Atmospheres and Influence Transmission Spectra
  • Super-Rayleigh Slopes in Transmission Spectra of Exoplanets Generated by Photochemical Haze
  • Grain Growth in Escaping Atmospheres: Implications for the Radius Inflation of Super-Puffs

    Atmospheric Dynamics on Tilted Exoplanets

    The axis-tilt (obliquity) of planet is of interest quantity because it affects the seasonal variation of planetary climates and might encapsulate the information on planet formation processes. Specifically, the obliquity drastically affects the atmospheric circulation and what they look like in observations. I have studied how the obliquity affects the atmospheric circulation and phase curve observations of tilted exoplanets.

    Relevant papers

  • Atmospheres on Nonsynchronized Eccentric-tilted Exoplanets. I. Dynamical Regimes
  • Atmospheres on Nonsynchronized Eccentric-tilted Exoplanets. II. Thermal Light Curves

    Haze Formation on Solar System Satellites

    Atmospheres on some solar system objects are suggested to be veiled by photochemically produced organic aerosols. It is important to understand the haze formation process because it significantly affects the energy budget and observations of the atmospheres. Hazy atmospheres in solar system offer the best testbed to verify our understanding of haze formation processes, which is crucial under the prevalence of hazes in exoplanetary atmospheres. I investigated haze formation processes on Triton, the largest moon of Neptune.

    Relevant papers

  • Haze Formation on Triton

    Linking Current Planetary Atmospheres to Past Planetary Formation

    Atmospheres encapsulate the memory of planet formation and evolution processes in its total mass and composition. Under the growing field of atmospheric observations for solar system planets as well as exoplanets, it is vital to study what we can learn about planet formation and evolution process. I studied the origin of Jupiter's "cold" atmospheric composition with focusing on the role of shadows in protoplanetary disks.

    Relevant papers

  • Jupiter’s “cold” formation in the protosolar disk sha: An explanation for the planet’s uniformly enriched atmosphere
  • Publication

    Submitted Papers

    Refereed Journals: Lead-author papers

      [9] Kazumasa Ohno and Yuki Tanaka, 2021
      "Grain Growth in Escaping Atmospheres: Implications for the Radius Inflation of Super-Puffs", ApJ, in press
      [ADS] [arXiv]

      [8] Kazumasa Ohno and Takahiro Ueda, 2021
      "Jupiter's "cold" formation in the protosolar disk shadow: An explanation for the planet's uniformly enriched atmosphere", A&A, 651, L2 (Highlighted paper)
      [ADS] [arXiv]

      [7] Kazumasa Ohno, Xi Zhang, Ryo Tazaki, and Satoshi Okuzumi, 2021
      "Haze Formation on Triton", ApJ, 912, 37
      [ADS] [arXiv]

      [6] Kazumasa Ohno and Yui Kawashima, 2020
      "Super-Rayleigh Slopes in Transmission Spectra of Exoplanets Generated by Photochemical Haze", ApJL, 895, 47
      [ADS] [arXiv]

      [5] Kazumasa Ohno, Satoshi Okuzumi, and Ryo Tazaki, 2020
      "Clouds of Fluffy Aggregates: How They Form in Exoplanetary Atmospheres and Influence Transmission Spectra", ApJ, 891, 131
      [ADS] [arXiv]

      [4] Kazumasa Ohno and Xi Zhang, 2019
      "Atmospheres on Nonsynchronized Eccentric-tilted Exoplanets II: Thermal Light Curves", ApJ, 874, 2
      [ADS] [arXiv]

      [3] Kazumasa Ohno and Xi Zhang, 2019
      "Atmospheres on Nonsynchronized Eccentric-tilted Exoplanets I: Dynamical Regimes", ApJ, 874, 1
      [ADS] [arXiv]

      [2] Kazumasa Ohno and Satoshi Okuzumi, 2018
      "Microphysical Modeling of Mineral Clouds in GJ1214 b and GJ436 b: Predicting Upper Limits on the Cloud-Top Height", ApJ, 859, 34
      [ADS] [arXiv]

      [1] Kazumasa Ohno and Satoshi Okuzumi, 2017
      "A Condensation-Coalescence Cloud Model for Exoplanetary Atmosheres: Formulation and Test Applications to Terrestrial and Jovian Clouds", ApJ, 835, 261
      [ADS] [arXiv]

    Refereed Journals: Co-author papers

    Presentation

      International Conferences (12talks, 11posters)

      [23] Kazumasa Ohno, Xi Zhang, Ryo Tazaki, Satoshi Okuzumi,"Microphysics of Haze Formation on Triton", EPSC 2021, Online, Oral (invited), Sep 2021

      [22] Kazumasa Ohno, Yuki Tanaka,"Aerosols in escaping atmospheres: Implications for Transmission Spectra and Origin of Super-puffs", Atmospheres, Atmospheres! Do I look like I care about atmospheres? (Atmo 2021), Online, Oral, Aug 2021

      [21] Kazumasa Ohno, Yuki Tanaka,"Aerosol Growth in Escaping Atmospheres: Implication for the Inflated Radii of Super-puffs and Young Exoplanets", 2021 Sagan Exoplanet Summer Virtual Workshop, Online, Poster, July 2021

      [20] Kazumasa Ohno, Yui Kawashima,"Super-Rayleigh slopes in exoplanetary transmission spectra may imply hazy atmospheres with vigorous mixing", STScI Spring Symposium, Online, Poster, April 2021

      [19] Kazumasa Ohno, Yuki Tanaka,"Grain growth in escaping atmospheres and its implications for the origin of super-puffs", Bay Area Exoplanet Meetings, Online, Oral, Mar 2021

      [18] Kazumasa Ohno, Yui Kawashima,"Super-Rayleigh slopes of exoplanetary transmission spectra generated by photochemical haze", 52nd Annual Meeting of the AAS Division for Planetary Science, Online, Oral, Oct 2020

      [17] Kazumasa Ohno, Satoshi Okuzumi, Ryo Tazaki,"Exo-hail or Exo-snow? Microphysical modeling and synthetic observations of sub-Neptune clouds", Exoplanets III, Online, Poster, Jul 2020

      [16] Kazumasa Ohno, Kiyoe Kawauchi, Yui Kawashima, Teruyuki Hirano, Taro Matsuo, Ayaka Okuya, Yuka Fujii, "Hunts for Mineral Clouds in Warm Exoplanets with SPICA", SPICA collaboration meeting, splinter session, zoom, Oral, Mar, 2020

      [15] Kazumasa Ohno, Satoshi Okuzumi, Ryo Tazaki, "Clouds of Fluffy Aggregates: How They Form in Exoplanetary Atmospheres and Influence Transmission Spectra", Planet2/RESCEU Symposium 2019, Okinawa, Oral, Oct 2019

      [14] Kazumasa Ohno, Satoshi Okuzumi, Ryo Tazaki, "Clouds of Fluffy Aggregates in Exoplanetary Atmospheres", EPSC-DPS Joint Meeting 2019, Geneva, Oral, Sep, 2019

      [13] Kazumasa Ohno, Satoshi Okuzumi, Ryo Tazaki,"Clouds of fluffy mineral aggregates in warm mini-Neptunes", Extreme Solar Systems IV, Reykjavik, Poster, Aug, 2019

      [12] Kazumasa Ohno, Xi Zhang, "Atmospheric Circulation and Thermal Light Curves of Eccentric-Tilted Exoplanets" , Exoclimes V, University of Oxford, Poster, Aug 2019

      [11] Kazumasa Ohno, Xi Zhang, "Atmospheric Dynamics on Eccentric-Tilted Exoplanets and Implications for Thermal Light Curves", "The 1st aquaplanetology symposium", ELSI, Oral, Mar 2019

      [10] K.Ohno, S.Okuzumi, R.Tazaki, "Mineral Clouds of Fluffy Aggregates in Exoplanetary Atmospheres", "Cloud Academy" , Les Houches, Oral, Sep 2018

      [9] K.Ohno, S.Okuzumi, R.Tazaki, "Microphysical Modeling of KCl Clouds on Warm Exoplanets", "Other Worlds Laboratoty 2018 Exoplanet Summer Program" , UCSC, Oral, July 2018

      [8] K.Ohno, S.Okuzumi, R.Tazaki, "Clouds of Fluffy Mineral Particles: a Possible Explanation for the Flat Transmission Spectra of Super-Earths", "Exoplanets II" , Cambridge, Poster, July 2018

      [7] K.Ohno, S.Okuzumi, "Microphysical Modeling of Mineral Clouds in Warm Super-Earths", "DTA Symposium VIII: Challenge to Super-Earths and Their Atmospheres", NAOJ, Oral, Mar 2018

      [6] K.Ohno, S.Okuzumi, "Microphysical Modeling of Convective Dust Clouds in Warm Super-Earths", "Exoplanets and Planet Formation", Shanghai, Poster, Dec 2017

      [5] K.Ohno, S.Okuzumi, "A Condensation-Coalescence Cloud Model for Exoplanetary Atmospheres: Formulation and Test Application to Terrestrial and Jovian Clouds", "JSPS Core-to-Core Program 'Planet2' Symposium", Citadelle de Villefranche sur Mer, Poster, Feb 2017

      [4] K.Ohno, S.Okuzumi, "A Condensation-Coalescence Cloud Model for Exoplanetary Atmospheres: Formulation and Test Application to Terrestrial and Jovian Clouds", "Linking Exoplanet and Disk Compositions", STScl, Poster, Sep 2016

      [3] K.Ohno, X.Zhang, "Influence of planetary obliquity on atmospheric dynamics on non-synchronized exoplanets", "Kavli Summer Program in Astrophysics 2016", UCSC, Oral, July 2016

      [2] K.Ohno, S.Okuzumi, "A New Cloud Model for Exoplanets: Formulation and Test Calculations", "Kavli Summer Program in Astrophysics 2016", UCSC, Poster, June 2016

      [1] K.Ohno, S.Okuzumi, "A New Cloud Model or Exoplanets: Formulation and Test Calculations", "Exoplanets and Disks: Their Formation and Diversity", Ishigaki Island, Poster, P24, Feb 2016



      Domestic Conferences (14talks, 7posters)

      2020年度 4.2020 - 3.2021

      [23] 大野和正, 植田高啓, 「大気から探る惑星形成:円盤影領域における木星形成説の提案」, 惑星系形成若手研究会, オンライン, 口頭, 2021年 2月

      [22] 大野和正, 田中佑希, 「ダスト散逸流によるスーパーパフの半径膨張説の再検討」, 新学術領域「星惑星形成」2020年度大研究会, オンライン, 口頭, 2020年 9月

      [21] 大野和正, 川島由依, 「系外惑星の大気透過光スペクトルにおける超レイリースロープ:光化学ヘイズによる説明」, 天文学会秋季年会, オンライン, 口頭, 2020年 9月

      2019年度 4.2019 - 3.2020

      [20] 大野和正, Zhang Xi, 田崎亮, 奥住聡, 「トリトン大気におけるヘイズ形成」, 衛星系研究会, 東北大学, 口頭, 2020年 2月

      [19] 大野和正, 奥住聡, 田崎亮, 「系外惑星大気中の雲形成における粒子サイズ・空隙率分布の共進化」, P37, 惑星科学会, 京都産業大学, ポスター, 2019年 10月

      [18] 大野和正, Zhang Xi, 田崎亮, 奥住聡, 「トリトン大気におけるヘイズ微物理モデリングとヘイズ生成率への示唆」 天文学会, 熊本大学, 口頭, 2018年 9月

      [17] 大野和正, "Assessing the Dusty Outflows from Super-puff with Grain Microphysics", 星惑c8 第49回天文・天体物理若手夏の学校, 豊橋, ポスター, 2019年 7月

      [16] 大野和正, 奥住聡, 田崎亮, "Mineral clouds of fluffy aggregates: how they form in exoplanetary atmospheres and influence transmission spectra", PAE20-05, JpGU, 幕張メッセ, 口頭, 2019年 5月

      2018年度 4.2018 - 3.2019

      [15] 大野和正, 奥住聡, 田崎亮, 「雲粒の空隙率進化によるスーパーアースの高層雲形成と大気組成への示唆」, S1, 惑星科学会, 旭川市科学館サイバル, 口頭, 2018年 10月

      [14] 大野和正, Zhang Xi, 「自転傾斜角を持つ系外惑星の大気循環構造と熱光度曲線」, P304a, 天文学会, 兵庫県立大学, 口頭, 2018年 9月

      [13] 大野和正, 「雲から探るスーパーアースの大気組成と形成過程」, b3, 第48回天文・天体物理若手夏の学校, 豊橋, ポスター, 2018年 7月

      [12] 大野和正, 奥住聡
      "Microphysical Modeling of Mineral Clouds in Warm Super-Earths: Predicting Upper Limits on the Cloud-Top Height", PAE20-06 JpGU, 幕張メッセ, 口頭, 2018年 5月

      2017年度 4.2017 - 3.2018

      [11] 大野和正, 奥住聡, 田崎亮, 「系外惑星におけるダスト雲の空隙率進化とその空間構造」, 天文学会, 千葉大学, 口頭, 2018年 3月

      [10] 大野和正, 奥住聡, 「スーパーアース大気における雲形成の理論モデリングと観測との比較」, 宇宙生命計算科学連携拠点第三回WS, 筑波大学, 口頭, 2017年 11月

      [9] 大野和正, Zhang Xi, 「自転軸の傾いた非同期回転系外惑星における大気循環:観測される光度曲線への示唆」, PPS07-P22, JpGU-AGU Joint Meeting 2017, 幕張メッセ, ポスター, 2017年 5月

      [8] 大野和正, 奥住聡, 「スーパーアースGJ1214bにおける鉱物雲のモデル化:大気金属量への示唆」, PPS07-24, JpGU-AGU Joint Meeting 2017, 幕張メッセ, 口頭, 2017年 5月

      2016年度 4.2016 - 3.2017

      [7] 大野和正, 奥住聡, 「系外惑星のために雲微物理モデルの開発:地球と木星の雲観測を用いた妥当性検証」, PPS11-P15, JpGU, 幕張メッセ, 口頭, 2016年 5月

      2015年度 4.2015 - 3.2016

      [6] 大野和正, 奥住聡, 「系外惑星の雲モデル開発:地球と木星の雲観測との比較」, P247a , 天文学会, 首都大学東京, 口頭, 2016年 3月

      [5] 大野和正, 奥住聡, 「系外惑星観測に向けた雲モデル開発:木星のアンモニア雲観測との比較」 , 近赤外高分散分光研究会, 国立天文台, ポスター, 2015年 11月

      [4] 大野和正, 奥住聡, 「衝突併合を考慮した系外惑星の雲モデル:定式化と地球の積雲観測との比較」, O1-01 , 惑星科学会, 東工大, 口頭, 2015年 10月

      [3] 大野和正, 奥住聡, 「雲粒の衝突合体を考慮した系外惑星の雲モデルの開発」, P223b 天文学会, 甲南大学, ポスター, 2015年 9月

      [2] 大野和正, 奥住聡, 「系外惑星雲モデルの構築と観測との比較」, 星惑a18, 第45回天文・天体物理若手夏の学校, 戸倉, 口頭, 2015年 7月

      [1] 大野和正, 奥住聡, 「地球型惑星大気における1次元雲形成モデルとその定常解」, PPS21-P11, JpGU, 幕張メッセ, ポスター, 2015年 5月


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