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2023 Fiscal Year Annual Research Report

低質量星周りの系外惑星探査による短周期惑星の質量損失の解明

Research Project

Project/Area Number 19K14783
Research InstitutionNational Institutes of Natural Sciences

Principal Investigator

平野 照幸  大学共同利用機関法人自然科学研究機構(機構直轄研究施設), アストロバイオロジーセンター, 准教授 (10727449)

Project Period (FY) 2019-04-01 – 2024-03-31
KeywordsM型矮星 / 太陽系外惑星 / トランジット / 近赤外高分散分光 / 地球型惑星
Outline of Annual Research Achievements

本研究は,太陽系外惑星の分布にみられる「1.5-2.0地球半径の惑星の欠乏(半径ギャップ)」や「周期3日以内の中間サイズ(2-8地球半径)の惑星の欠乏」などの統計的特性の原因を解明するため,従来あまり系外惑星探査が進んでいなかったM型矮星(特にM4型以降の中期-晩期M型矮星)に焦点を当て,系外惑星の発見と特徴づけを実施した。具体的には,(1)近赤外線スペクトルを対象とした視線速度測定法の改良,(2)低質量星まわりのトランジット惑星探査,の2つのテーマに取り組んだ。2022年以前の研究で研究(1)については概ね研究(従来の分光器・波長較正用光源に対するパイプラインの作成)が完了していたが,2023年度は自転速度が比較的大きい恒星の視線速度も正確に推定できるように,解析するスペクトル域(セグメント)の幅を調整するなど解析パイプラインの改良を行った。一方,研究(2)では,国内外の共同研究者と連携して,TESSミッション等で観測されたM型矮星のまわりで検出されていた惑星候補に対するフォローアップ観測を集中的に実施し,小型惑星を含む数個程度の惑星の発見確認を行った。

  • Research Products

    (29 results)

All 2024 2023 Other

All Int'l Joint Research (6 results) Journal Article (15 results) (of which Int'l Joint Research: 15 results,  Peer Reviewed: 15 results,  Open Access: 15 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Int'l Joint Research] ハワイ大学/プリンストン大学/マサチューセッツ工科大学(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      ハワイ大学/プリンストン大学/マサチューセッツ工科大学
    • # of Other Institutions
      5
  • [Int'l Joint Research] カナリア天体物理研究所(スペイン)

    • Country Name
      SPAIN
    • Counterpart Institution
      カナリア天体物理研究所
  • [Int'l Joint Research] オーフス大学(デンマーク)

    • Country Name
      DENMARK
    • Counterpart Institution
      オーフス大学
  • [Int'l Joint Research] ドイツ航空宇宙センター/ケルン大学/カール・シュヴァルツシルト天 文台(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      ドイツ航空宇宙センター/ケルン大学/カール・シュヴァルツシルト天 文台
  • [Int'l Joint Research] マギル大学(カナダ)

    • Country Name
      CANADA
    • Counterpart Institution
      マギル大学
  • [Int'l Joint Research]

    • # of Other Countries
      2
  • [Journal Article] TOI-544 b: a potential water-world inside the radius valley in a two-planet system2023

    • Author(s)
      Osborne H L M、Van Eylen V、Goffo E、Gandolfi D、Nowak G、Persson C M、Livingston J、Weeks A、Palle E、Luque R、Hellier C、Carleo I、Redfield S、Hirano T、et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 527 Pages: 11138~11157

    • DOI

      10.1093/mnras/stad3837

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Planetary companions orbiting the M dwarfs GJ 724 and GJ 39882023

    • Author(s)
      Gorrini P.、Kemmer J.、Dreizler S.、Burn R.、Hirano T.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 680 Pages: A28

    • DOI

      10.1051/0004-6361/202347108

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] CO, H2O, and CH4 in the dusty atmosphere of a <5 Myr-old exoplanet2023

    • Author(s)
      Gaidos Eric、Hirano Teruyuki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 525 Pages: 6303~6311

    • DOI

      10.1093/mnras/stad2664

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An M dwarf accompanied by a close-in giant orbiter with SPECULOOS2023

    • Author(s)
      Triaud Amaury H M J、Dransfield Georgina、Kagetani Taiki、Timmermans Mathilde、Narita Norio、Barkaoui Khalid、Hirano Teruyuki、et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society: Letters

      Volume: 525 Pages: L98~L104

    • DOI

      10.1093/mnrasl/slad097

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Orbit of Warm Jupiter WASP-106 b is Aligned with its Star2023

    • Author(s)
      Harre Jan-Vincent、Smith Alexis M. S.、Hirano Teruyuki、Csizmadia Szilard、J. Triaud Amaury H. M.、Anderson David R.
    • Journal Title

      The Astronomical Journal

      Volume: 166 Pages: 159

    • DOI

      10.3847/1538-3881/acf46d

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Company for the Ultra-high Density, Ultra-short Period Sub-Earth GJ 367 b: Discovery of Two Additional Low-mass Planets at 11.5 and 34 Days*2023

    • Author(s)
      Goffo Elisa、Gandolfi Davide、Egger Jo Ann、Mustill Alexander J.、Albrecht Simon H.、Hirano Teruyuki、et al.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 955 Pages: L3

    • DOI

      10.3847/2041-8213/ace0c7

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf2023

    • Author(s)
      Kagetani Taiki、Narita Norio、Kimura Tadahiro、Hirano Teruyuki、et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 75 Pages: 713~721

    • DOI

      10.1093/pasj/psad031

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cerium Features in Kilonova Near-infrared Spectra: Implication from a Chemically Peculiar Star2023

    • Author(s)
      Tanaka Masaomi、Domoto Nanae、Aoki Wako、Ishigaki Miho N.、Wanajo Shinya、Hotokezaka Kenta、Kawaguchi Kyohei、Kato Daiji、Lee Jae-Joon、Lee Ho-Gyu、Hirano Teruyuki、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 953 Pages: 17

    • DOI

      10.3847/1538-4357/acdc95

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Overfitting Affects the Reliability of Radial Velocity Mass Estimates of the V1298 Tau Planets2023

    • Author(s)
      Blunt Sarah、Carvalho Adolfo、David Trevor J.、...、Hirano Teruyuki、et al.
    • Journal Title

      The Astronomical Journal

      Volume: 166 Pages: 62

    • DOI

      10.3847/1538-3881/acde78

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Spectroscopic Thermometer: Individual Vibrational Band Spectroscopy with the Example of OH in the Atmosphere of WASP-33b2023

    • Author(s)
      Wright Sam O. M.、Nugroho Stevanus K.、Brogi Matteo、Gibson Neale P.、de Mooij Ernst J. W.、Waldmann Ingo、Tennyson Jonathan、Kawahara Hajime、Kuzuhara Masayuki、Hirano Teruyuki、et al.
    • Journal Title

      The Astronomical Journal

      Volume: 166 Pages: 41

    • DOI

      10.3847/1538-3881/acdb75

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] TOI-1130: A photodynamical analysis of a hot Jupiter in resonance with an inner low-mass planet2023

    • Author(s)
      Korth J.、Gandolfi D.、Subjak J.、...、Hirano T.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 675 Pages: A115

    • DOI

      10.1051/0004-6361/202244617

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Absence of extended atmospheres in low-mass star radius-gap planets2023

    • Author(s)
      Krishnamurthy Vigneshwaran、Hirano Teruyuki、et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 521 Pages: 1210~1220

    • DOI

      10.1093/mnras/stad404

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] TOI-1442 b and TOI-2445 b: Two potentially rocky ultra-short period planets around M dwarfs2023

    • Author(s)
      Morello G.、Parviainen H.、Murgas F.、Palle E.、Oshagh M.、Fukui A.、Hirano T.、et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 673 Pages: A32

    • DOI

      10.1051/0004-6361/202243592

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b2023

    • Author(s)
      Ridden-Harper Andrew、Nugroho Stevanus K.、Flagg Laura、Jayawardhana Ray、Turner Jake D.、de Mooij Ernst、MacDonald Ryan、Deibert Emily、Tamura Motohide、Kotani Takayuki、Hirano Teruyuki、Kuzuhara Masayuki、Omiya Masashi、Kusakabe Nobuhiko
    • Journal Title

      The Astronomical Journal

      Volume: 165 Pages: 170

    • DOI

      10.3847/1538-3881/acbd39

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct Imaging Explorations for Companions around Mid-Late M Stars from the Subaru/IRD Strategic Program2023

    • Author(s)
      Uyama Taichi、Beichman Charles、Kuzuhara Masayuki、Janson Markus、Kotani Takayuki、Mawet Dimitri、Sato Bun’ei、Tamura Motohide、Ishikawa Hiroyuki Tako、Cale Bryson、Currie Thayne、Harakawa Hiroki、Henning Thomas、Hirano Teruyuki、et al.
    • Journal Title

      The Astronomical Journal

      Volume: 165 Pages: 162

    • DOI

      10.3847/1538-3881/acbf37

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Helium Transmission Spectroscopy for Young Planets2024

    • Author(s)
      平野照幸
    • Organizer
      2024年冬季トランジット惑星研究検討会
    • Invited
  • [Presentation] 近赤外視線速度測定・黒点由来のRVジッターの波長依存性について2024

    • Author(s)
      平野照幸
    • Organizer
      Extreme Precision Radial Velocity (EPRV) ワークショップ
  • [Presentation] 近赤外透過光分光による惑星大気散逸の観測2024

    • Author(s)
      平野照幸,すばる/IRDチーム
    • Organizer
      名大ISEE研究集会「宇宙プラズマ・恒星放射が惑星超高層大気・衛星表層環境に及ぼす影響」
  • [Presentation] Analytic Description of Radial Velocity Jitters2023

    • Author(s)
      Teruyuki Hirano, Eric Gaidos, Hiroki Harakawa, Takayuki Kotani, Masayuki Kuzuhara, Masashi Omiya, Motohide Tamura
    • Organizer
      Protostars and Planets VII
    • Int'l Joint Research
  • [Presentation] 系外惑星上層大気の観測と大気散逸2023

    • Author(s)
      平野照幸,福井暁彦,川内紀代恵,Eric Gaidos, Vigneshwaran Krishnamurthy,すばる/IRDチーム
    • Organizer
      日本天文学会2023年秋季年会
  • [Presentation] Chromatic Measurements of Radial-Velocity Jitter2023

    • Author(s)
      Teruyuki Hirano, IRD team
    • Organizer
      the 14th RESCEU International Symposium
    • Int'l Joint Research
  • [Presentation] 若い系外惑星系の観測:恒星活動の波長依存性2023

    • Author(s)
      平野照幸
    • Organizer
      新学術領域「星・惑星形成」2023年度大研究会
  • [Presentation] Exoplanet detection and characterization by the InfraRed Doppler (IRD) instrument on Subaru2023

    • Author(s)
      Teruyuki Hirano
    • Organizer
      Exoplanets & Planet Formation Workshop 2023
    • Int'l Joint Research / Invited

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Published: 2024-12-25  

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