原始惑星系円盤・系外惑星大気の化学構造研究から迫る、普遍的な惑星形成理論

• Project/Area Number: 16J06887
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Astronomy
• Research Institution: Kyoto University
• Principal Investigator: 野津 翔太 京都大学, 理学研究科, 特別研究員(DC1)
• Project Period (FY): 2016-04-22 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,400,000 (Direct Cost: ¥3,400,000); Fiscal Year 2018: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2017: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2016: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: 原始惑星系円盤 / 星・惑星形成 / スノーライン / 太陽系外惑星 / ダスト / ALMA / スーパーフレア / C/O比 / 高分散分光観測

Outline of Annual Research Achievements

本研究課題は、原始惑星系円盤(以下、“円盤”)と系外惑星大気の化学構造計算と、最新の観測結果による裏付けを元に、普遍的かつ現実的な惑星形成理論を構築する事を目的としている。以下、平成30年度の研究実績概要を述べる。

(1)昨年度に引き続き円盤内の化学反応計算と分子輝線の放射輸送計算を行い、高分散分光観測によるスノーラインの位置同定に有効な輝線の特徴・将来の多波長(赤外線~サブミリ波)での観測可能性の議論を進めた。なお私達の研究が評価され、スノーライン同定を目指したH2O輝線観測は、SPICAの中間赤外線高分散分光観測の重要サイエンスの1つにも取り上げられている。また従来の計算を拡張し、スノーライン位置や分子組成比分布の進化を探る事を目的として、円盤物理構造進化を考慮した化学反応計算のコード開発にも着手した。(2)代表者は昨年度までに、H2Oスノーラインの同定を目指したALMA円盤水輝線観測の申請を行い高い評価で採択され、一部観測が既に実施済みであった。本年度は配信されたデータを元に水輝線の探索やダスト連続波の構造調査などを進めた。更にその成果を自ら筆頭著者として1編の論文にまとめ、査読付国際学術誌に投稿、既に出版済みである。(3)系外惑星大気の化学構造と円盤内惑星形成環境の関係を探るべく、大気中の元素組成比としてEistrup et al. 2016の複数の円盤化学進化モデルの場合の値を採用した上で、化学平衡計算の手法を用いて系外ガス惑星大気の化学構造の計算・議論を行なった。その上で、現時点の成果を日本天文学会の年会等で報告した。(4)太陽型星の巨大黒点のサイズ分布やスーパーフレア星の性質について、Kepler宇宙望遠鏡を用いた測光観測、APOのARC3.5m望遠鏡を用いた高分散分光観測などを通じた研究を行なった他、恒星フレアの時間分解分光観測などについても研究を進展させた。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Leiden University/University of Groningen(オランダ)
• [Int'l Joint Research] Queen’s University Belfast/University of Leeds/University College London(英国)
• [Int'l Joint Research] University of Washington/University of Virginia(米国)
• [Int'l Joint Research] Leiden University/University of Groningen(オランダ)
• [Int'l Joint Research] Queen’s University Belfast/University of Leeds/University College London(United Kingdom)
• [Int'l Joint Research] Leiden University/University of Groningen(オランダ)
• [Int'l Joint Research] Queen’s University Belfast/University of Leeds(United Kingdom)
• [Journal Article] Dust Continuum Emission and the Upper Limit Fluxes of Submillimeter Water Lines of the Protoplanetary Disk around HD 163296 Observed by ALMA (2019)
  • Author(s): Notsu Shota, Akiyama Eiji, Booth Alice, Nomura Hideko, Walsh Catherine, Hirota Tomoya, Honda Mitsuhiko, Tsukagoshi Takashi, Millar T. J.
  • Journal Title: The Astrophysical Journal Volume: 875 Issue: 2 Pages: 96-96
  • DOI: 10.3847/1538-4357/ab0ae9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Do Kepler superflare stars really include slowly-rotating Sun-like stars ? - Results using APO 3.5m telescope spectroscopic observations and Gaia-DR2 data - (2019)
  • Author(s): Notsu Yuta, Maehara Hiroyuki, Honda Satoshi, Hawley Suzanne L., Davenport James R. A., Namekata Kosuke, Notsu Shota, Ikuta Kai, Nogami Daisaku, Shibata Kazunari
  • Journal Title: The Astrophysical Journal Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots (2019)
  • Author(s): Namekata, Kosuke; Maehara, Hiroyuki; Notsu, Yuta; Toriumi, Shin; Hayakawa, Hisashi; Ikuta, Kai; Notsu, Shota; Honda, Satoshi; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: The Astrophysical Journal Volume: 871 Issue: 2 Pages: 187-187
  • DOI: 10.3847/1538-4357/aaf471
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Possibility to locate the position of the H₂O snowline in protoplanetary disks using high-dispersion spectroscopic observations (2018)
  • Author(s): 野津翔太
  • Journal Title: Planetary People - The Japanese Society for Planetary Sciences Volume: 27 Issue: 3 Pages: 120-126
  • DOI: 10.14909/yuseijin.27.3_120
  • NAID: 130007546885
  • ISSN: 0918-273X, 2423-897X
  • Year and Date: 2018-09-25
  • Peer Reviewed / Open Access
• [Journal Article] Time resolved spectroscopic observations of an M-dwarf flare star EV Lac during a flare (2018)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Namekata, Kosuke; Notsu, Shota; Maehara, Hiroyuki; Ikuta, Kai; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: Publications of the Astronomical Society of Japan Volume: - Issue: 4 Pages: 62-62
  • DOI: 10.1093/pasj/psy055
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2018)
  • Author(s): Notsu Shota, Nomura Hideko, Walsh Catherine, Honda Mitsuhiko, Hirota Tomoya, Akiyama Eiji, Millar T. J.
  • Journal Title: Astrochemistry VII: Through the Cosmos from Galaxies to Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 332 Volume: 13 Issue: S332 Pages: 113-120
  • DOI: 10.1017/s1743921317007797
  • Int'l Joint Research
• [Journal Article] Candidate Water Vapor Lines to Locate the H2O Snowline through High-dispersion Spectroscopic Observations. III. Submillimeter H2 16O and H2 18O Lines (2018)
  • Author(s): Notsu, Shota; Nomura, Hideko; Walsh, Catherine; Honda, Mitsuhiko; Hirota, Tomoya; Akiyama, Eiji; Millar, T. J.
  • Journal Title: アストロフィジカル・ジャーナル Volume: 855 Issue: 1 Pages: 62-77
  • DOI: 10.3847/1538-4357/aaaa72
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars (2017)
  • Author(s): Namekata, K., Sakaue, T., Watanabe, K., Asai, A., Maehara, H., Notsu, Y., Notsu, S., Honda, S., Ishii, T. T., Ikuta, K., Nogami, D., Shibata, K.
  • Journal Title: The Astrophysical Journal Volume: 851 Issue: 2 Pages: 91-91
  • DOI: 10.3847/1538-4357/aa9b34
  • Peer Reviewed
• [Journal Article] Starspot activity and superflares on solar-type stars (2017)
  • Author(s): Maehara, H., Notsu, Y., Notsu, S., Namekata, K., Honda, S., Ishii, T., T., Nogami, D., and Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中 Issue: 3 Pages: 41-41
  • DOI: 10.1093/pasj/psx013
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Candidate Water Vapor Lines to Locate the H2O Snowline through High-dispersion Spectroscopic Observations. II. The Case of a Herbig Ae Star (2017)
  • Author(s): Notsu, Shota; Nomura, Hideko; Ishimoto, Daiki; Walsh, Catherine; Honda, Mitsuhiko; Hirota, Tomoya; Millar, T. J.
  • Journal Title: The Astrophysical Journal Volume: 836 Issue: 1 Pages: 118-118
  • DOI: 10.3847/1538-4357/836/1/118
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Spectroscopic observations of active solar-analog stars with high X-ray luminosity, as a proxy of superflare stars (2017)
  • Author(s): Notsu, Y., Honda, S., Maehara, H., Notsu, S., Namekata, K., Nogami, D., and Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 1 Pages: 12-12
  • DOI: 10.1093/pasj/psw116
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Starspot activity and superflares on solar-type stars (2017)
  • Author(s): Hiroyuki Maehara, Yuta Notsu, Shota Notsu, Kosuke Namekata, Satoshi Honda, Takako T. Ishii, Daisaku Nogami, Kazunari Shibata
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Candidate Water Vapor Lines to Locate the H2O Snowline through High-dispersion Spectroscopic Observations. I. The Case of a T Tauri Star (2016)
  • Author(s): Notsu, Shota; Nomura, Hideko; Ishimoto, Daiki; Walsh, Catherine; Honda, Mitsuhiko; Hirota, Tomoya; Millar, T. J.
  • Journal Title: The Astrophysical Journal Volume: 827 Issue: 2 Pages: 113-113
  • DOI: 10.3847/0004-637x/827/2/113
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High dispersion spectroscopy of solar-type superflare stars with Subaru/HDS (2016)
  • Author(s): Notsu, Y., Honda, S., Maehara, H., Notsu, S., Shibayama, T., Nogami, D., & Shibata, K.
  • Journal Title: Proceedings of the IAU Symposium Volume: 320 Issue: S320 Pages: 138-138
  • DOI: 10.1017/s1743921316000430
• [Presentation] 原始惑星系円盤の化学反応計算と、H2O スノーラインの分光観測による同定可能性 (2018)
  • Author(s): 野津翔太
  • Organizer: 第 31 回 理論懇シンポジウム 2018「宇宙物理の標準理論:未来へ向けての再考」
• [Presentation] Water lines and multiple ring and gap structures of the protoplanetary disk around HD 163296 observed by ALMA (2018)
  • Author(s): 野津翔太
  • Organizer: East Asian ALMA Science Workshop 2018
  • Int'l Joint Research
• [Presentation] Water lines and multiple ring and gap structures of the protoplanetary disk around HD 163296 observed by ALMA (2018)
  • Author(s): 野津翔太
  • Organizer: Workshop on Interstellar Matter 2018
  • Int'l Joint Research
• [Presentation] HD163296 の原始惑星系円盤の ALMA 観測 -水輝線と多重リング・ギャップ構造- (2018)
  • Author(s): 野津翔太, 野村英子, 秋山永治, Booth Alice, Walsh Catherine, 廣田朋也, 本田充彦, 塚越崇, Millar T. J.
  • Organizer: 日本惑星科学会 2018年秋季講演会
• [Presentation] Water lines and multiple ring and gap structures of the protoplanetary disk around HD 163296 observed by ALMA (2018)
  • Author(s): 野津翔太
  • Organizer: Japanese-German meeting on Exoplanets and Planet Formation 2018
  • Int'l Joint Research
• [Presentation] 詳細な円盤化学進化計算を初期条件とした系外ガス惑星大気の平衡化学構造 (2018)
  • Author(s): 野津翔太, 野村英子, Eistrup Christian, Walsh Catherine, 佐藤文衛, 藤田大地, Waldmann Ingo, Tinetti Giovanna
  • Organizer: 日本天文学会 2018年秋季年会
• [Presentation] Dust continuum emission and sub-millimeter water lines of the protoplanetary disk around HD 163296 observed by ALMA (2018)
  • Author(s): 野津翔太
  • Organizer: 2018 年度 惑星・衛星系研究会
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2018)
  • Author(s): Notsu Shota, Nomura Hideko, Walsh Catherine, Honda Mitsuhiko, Hirota Tomoya, Akiyama Eiji, Tsukagoshi Takashi, Booth Alice, Millar T. J.
  • Organizer: International Astronomical Union General Assembly XXXth (30th), IAU Symposium 345: Origins: From the Protosun to the First Steps of Life
  • Int'l Joint Research
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2018)
  • Author(s): 野津翔太
  • Organizer: Astrochemistry: Past, Present, & Future
  • Int'l Joint Research
• [Presentation] Equilibrium chemical structures of extrasolar gaseous planetary atmospheres on the basis of detailed disk chemical evolutionary calculations (2018)
  • Author(s): 野津翔太
  • Organizer: Astrochemistry Workshop
  • Int'l Joint Research
• [Presentation] ALMA高分散分光観測による、原始惑星系円盤の H2O スノーラインの同定可能性 (2018)
  • Author(s): 野津翔太, 野村英子, 秋山永治, 廣田朋也, 本田充彦, Walsh Catherine, Booth Alice, Millar T. J.
  • Organizer: 日本地球惑星科学連合(JpGU) 2018年大会 (セッション:アルマによる惑星科学の新展開)
  • Invited
• [Presentation] ALMA によるHD163296の原始惑星系円盤中の多重リング構造と水輝線探索 (2018)
  • Author(s): 野津翔太, 野村英子, 秋山永治, 廣田朋也, 本田充彦, Catherine Walsh, Alice Booth, Tom Millar
  • Organizer: 日本天文学会 2018年春季年会
• [Presentation] Water during planet formation and evolution 2018 (2018)
  • Author(s): 野津翔太
  • Organizer: Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations
  • Int'l Joint Research
• [Presentation] ALMA高分散分光観測による、原始惑星系円盤のH2Oスノーラインの同定可能性 (2018)
  • Author(s): 野津翔太
  • Organizer: 2018年 第一回原始惑星系円盤 ALMA ワークショップ
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2017)
  • Author(s): 野津翔太
  • Organizer: IAU Symposium 332, Astrochemistry VII - Through the Cosmos from Galaxies to Planets
  • Place of Presentation: Hotel Cumbres in Puerto Varas, Chile
  • Year and Date: 2017-03-20
  • Int'l Joint Research
• [Presentation] 様々な元素組成・温度構造を持つ太陽系外ガス惑星大気の平衡化学構造 (2017)
  • Author(s): 野津翔太, 野村英子, Catherine Walsh, Christian Eistrup
  • Organizer: 日本天文学会 2017年春季年会
  • Place of Presentation: 九州大学 伊都キャンパス
  • Year and Date: 2017-03-15
• [Presentation] ALMA分光観測による原始惑星系円盤のH2Oスノーラインの同定可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 第30回 理論懇シンポジウム 2017「星の物理の新地平」
• [Presentation] ALMA分光観測による原始惑星系円盤のH2Oスノーラインの同定可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 第34回 Grain Formation Workshop
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2017)
  • Author(s): 野津翔太
  • Organizer: 10th RESCEU/Planet2 Symposium "Planet Formation around Snowline"
  • Int'l Joint Research
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations with ALMA (2017)
  • Author(s): 野津翔太
  • Organizer: ALMA Long Baseline Workshop
  • Int'l Joint Research
• [Presentation] ALMA分光観測による原始惑星系円盤のH2Oスノーラインの同定可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 日本惑星科学会 2017年秋季講演会
• [Presentation] ALMA分光観測による原始惑星系円盤のH2Oスノーラインの同定可能性 (2017)
  • Author(s): 野津翔太, 野村英子, 本田充彦, 廣田朋也, 秋山永治
  • Organizer: 日本天文学会 2017年秋季年会
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2017)
  • Author(s): 野津翔太
  • Organizer: 2017年 惑星・衛星系研究会
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2017)
  • Author(s): 野津翔太
  • Organizer: Molecules in Space: Linking the Interstellar Medium to (Exo)-Planets
  • Int'l Joint Research
• [Presentation] 原始惑星系円盤の化学構造と、分光観測を用いたH2Oスノーラインの検出可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 基研研究会「原始惑星系円盤」
• [Presentation] Possibility to locate the position of the H2O snowline in protoplanetary disks through spectroscopic observations (2017)
  • Author(s): 野津翔太
  • Organizer: Symposium “Evolution of Molecules in Space”
  • Int'l Joint Research
• [Presentation] 様々な元素組成・温度構造を持つ太陽系外ガス惑星大気の平衡化学構造 (2017)
  • Author(s): 野津翔太
  • Organizer: 日本地球惑星科学連合 2017年大会
• [Presentation] ALMAの高分散分光観測による、原始惑星系円盤のH2Oスノーラインの同定可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 日本地球惑星科学連合 2017年大会
• [Presentation] ALMAを用いた原始惑星系円盤のH2O line観測の可能性 (2017)
  • Author(s): 野津翔太
  • Organizer: 2017年 第1回ALMA原始惑星系円盤検討会
  • Place of Presentation: 国立天文台 三鷹キャンパス
• [Presentation] How to measure snowlines and C/O ratio distributions in protoplanetary disks using spectroscopic observations (2016)
  • Author(s): 野津翔太
  • Organizer: Workshop on Interstellar Matter 2016
  • Place of Presentation: 北海道大学低温科学研究所
  • Year and Date: 2016-10-19
  • Int'l Joint Research
• [Presentation] How to Measure Snowlines and C/O Ratio Distributions in Protoplanetary Disks Using Spectroscopic Observations (2016)
  • Author(s): 野津翔太
  • Organizer: Japan-Germany planet & disk workshop
  • Place of Presentation: 沖縄県石垣市 石垣島ビーチホテルサンシャイン
  • Year and Date: 2016-09-25
  • Int'l Joint Research
• [Presentation] How to Measure Snowlines and C/O Ratio Distributions in Protoplanetary Disks Using Infrared Spectroscopic Observations (2016)
  • Author(s): 野津翔太
  • Organizer: Linking Exoplanet and Disk Compositions
  • Place of Presentation: STScI (Space Telescope Science Institute), Baltimore, USA
  • Year and Date: 2016-09-12
  • Int'l Joint Research
• [Presentation] How to measure C/O ratio distributions in protoplanetary disks using infrared spectroscopic observations (2016)
  • Author(s): 野津翔太
  • Organizer: 2016年 惑星・衛星系研究会
  • Place of Presentation: 静岡県伊東市 ルネッサ赤沢
  • Year and Date: 2016-08-27
• [Presentation] Infrared Spectroastrometric Imaging of the Water Snowline and C/O Ratio Distributions in Protoplanetary Disks (2016)
  • Author(s): 野津翔太, 野村英子
  • Organizer: TMT Science Forum
  • Place of Presentation: 京都市国際交流会館
  • Year and Date: 2016-05-24
  • Int'l Joint Research
• [Presentation] 原始惑星系円盤の化学反応計算と、赤外線分光観測によるスノーライン・C/O比分布の検出可能性 (2016)
  • Author(s): 野津翔太, 野村英子, 石本大貴, 本田充彦
  • Organizer: 日本地球惑星科学連合(JpGU) 2016年大会
  • Place of Presentation: 幕張メッセ・アパホテル&リゾート東京ベイ幕張
  • Year and Date: 2016-05-22
• [Presentation] Possibility of Detecting the H2O Snowline in Protoplanetary Disks Using Spectroscopic Observations (2016)
  • Author(s): 野津翔太
  • Organizer: Water in the Universe: From Clouds to Oceans
  • Place of Presentation: ESA/ESTEC (European Space Research and Technology Centre), Noordwijk, the Netherlands
  • Year and Date: 2016-04-12
  • Int'l Joint Research
• [Presentation] Infrared Spectroastrometric Imaging of the Water Snowline and C/O Ratio Distributions in Protoplanetary Disks (2016)
  • Author(s): 野津翔太, 野村英子
  • Organizer: TMT MICHI Workshop
  • Place of Presentation: 京都大学理学研究科
  • Int'l Joint Research
• [Remarks] Website of Shota Notsu
  • URL: https://home.strw.leidenuniv.nl/~notsust/
• [Remarks] Website of Shota Notsu
  • URL: http://www.kusastro.kyoto-u.ac.jp/~snotsu/index.html