Search for unseen massive objects, brown dwarfs and exoplanets in binary systems by applying an asteroseismic method to the photometric data taken with the Kepler space telescope

• Project/Area Number: 16K05288
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Shibahashi Hiromoto 東京大学, 大学院理学系研究科(理学部), 名誉教授 (30126081)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 星震学 / 連星 / 恒星 / 系外惑星 / ブラックホール / 脈動星 / 光学赤外線天文学 / 理論天文学 / 天文 / 宇宙物理

Outline of Final Research Achievements

We have succeeded in extremely efficiently detecting a large number of binary stars that greatly exceed the number of known binary stars from only the photometric data of type A stars by the Kepler Space Telescope. After determining their orbital elements and mass functions, we created a on-line binary catalog for open use. A lot of new knowledge about binary orbital evolution and origin was obtained by the statistical investigation based on the catalog.
In this process, we first detected a giant exoplanet in the habitable zone of A-type main sequence stars. In addition, we detected X-ray quiet black hole candidates.

Academic Significance and Societal Importance of the Research Achievements

距離が測れる近傍の連星は、宇宙を理解するための基本的な情報源である。実視連星は、軌道決定に長期の時間が必要となり、数は限定的である。食連星と分光連星の場合には、地上の望遠鏡による個々の星の分光観測が必要であり、望遠鏡の都合や天候等によるため、多大な時間と労力が必要となる。結果として、近傍で且つ軌道が決定されている連星は限定的なものであった。
ケプラー宇宙望遠鏡によるA型星の測光データのみから、大量の連星を極めて効率的に検出することに成功し、その軌道要素、質量関数カタログを作成した。これを使った統計的議論により多くの新たな知見が得られた。また、系外惑星、ブラックホール候補天体を検出した。

Research Products

• [Int'l Joint Research] University of Sydney(オーストラリア)
• [Int'l Joint Research] University of Central Lancashire(英国)
• [Int'l Joint Research] University of Sydney(オーストラリア)
• [Int'l Joint Research] University of Aarhus(デンマーク)
• [Int'l Joint Research] KU Leuven(ベルギー)
• [Int'l Joint Research] Universidade do Porto(ポルトガル)
• [Int'l Joint Research] The University of Sydney(オーストラリア)
• [Int'l Joint Research] Universidad Nacional de La Plata(アルゼンチン)
• [Int'l Joint Research] Max-Planck-Institut(ドイツ)
• [Int'l Joint Research] New York University Abu Dhabi(アラブ首長国連邦)
• [Int'l Joint Research] University of Central Lancashire(英国)
• [Journal Article] Search for quiet stellar-mass black holes by asteroseismology from space (2020)
  • Author(s): Shibahashi, H., Murphy, S. J.
  • Journal Title: Proceedings of the conference "Stars and their Variability - observed from Space" Volume: -
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pulsation in the white dwarf HE 1017-1352: confirmation of the class of hot DAV stars (2020)
  • Author(s): Romero, A. D., Amaral, L. A., Kepler, S. O., Fraga, L, Kurtz, D., Shibahashi, H.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: -
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Asteroseismology as a new window to statistics of binaries (2019)
  • Author(s): Shibahashi, H., Murphy, S. J.
  • Journal Title: Bulletin de la Societe Royale des Sciences de Liege Volume: 88 Pages: 147-162
  • DOI: 10.25518/0037-9565.9288
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating γ Dor star, KIC 5608334 (2018)
  • Author(s): Saio, Hideyuki; Bedding, Timothy R.; Kurtz, Donald W.; Murphy, Simon J.; Antoci, Victoria L.; Shibahashi, Hiromoto; Li, Gang; Takata, Masao
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: - Issue: 2 Pages: 2183-2195
  • DOI: 10.1093/mnras/sty784
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] K2 observations of the rapidly oscillating Ap star 33 Lib (HD 137949): new frequencies and unique non-linear interactions (2018)
  • Author(s): Holdsworth Daniel L、Cunha M S、Shibahashi H、Kurtz D W、Bowman D M
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 480 Issue: 3 Pages: 2976-2984
  • DOI: 10.1093/mnras/sty2053
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Finding binaries from phase modulation of pulsating stars with Kepler: V. Orbital parameters, with eccentricity and mass-ratio distributions of 341 new binaries (2018)
  • Author(s): Simon J. Murphy, Maxwell Moe, Donald W. Kurtz, Timothy R. Bedding, Hiromoto Shibahashi, Henri M. J. Boffin
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 474 Issue: 4 Pages: 4322-4346
  • DOI: 10.1093/mnras/stx3049
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spectroscopic and aster-seismic analysis of the remarkable main-sequence A star KIC 11145123 (2017)
  • Author(s): Masahide Takada-Hidai, Donald W. Kurtz, Hiromoto Shibahashi, Simon J. Murphy, Masao Takata, Hideyuki Saio, Takashi Sekii
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 470 Issue: 4 Pages: 4908-4924
  • DOI: 10.1093/mnras/stx1506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Finding binaries from phase modulation of pulsating stars with Kepler (2017)
  • Author(s): Hiromoto Shibahashi, Simon Murphy, Tim Bedding
  • Journal Title: EPJ Web of Conferences Volume: 152 Pages: 03003-03003
  • DOI: 10.1051/epjconf/201715203003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Blazhko RR Lyrae variables and phase modulation in binary systems (2017)
  • Author(s): Hiromoto Shibahashi
  • Journal Title: EPJ Web of Conferences Volume: 152 Pages: 03006-03006
  • DOI: 10.1051/epjconf/201715203006
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pulsational instability of high-luminosity H-rich pre-white dwarf star (2017)
  • Author(s): Leila M. Calcaferro, Alejandro H. Corsico, Maria E. Camisassa, Leandro G. Althaus, Hiromoto Shibahashi
  • Journal Title: EPJ Web of Conferences Volume: 152 Pages: 06012-06012
  • DOI: 10.1051/epjconf/201715206012
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Finding binaries from phase modulation of pulsating stars with Kepler (2017)
  • Author(s): H. Shibahashi, S. Murphy, T. Bedding
  • Journal Title: EPJ-Conference series Volume: -
  • Int'l Joint Research
• [Journal Article] The Blazhko RR Lyrae variables and phase modulation in binary systems (2017)
  • Author(s): H. Shibahashi
  • Journal Title: EPJ-Conference series Volume: -
  • Int'l Joint Research
• [Journal Article] Pulsational instability of high-luminosity H-rich pre-white dwarf stars (2017)
  • Author(s): L. M. Calcaferro, A. H. Corsico, M. E. Camisassa, L. G. Althaus, H. Shibahashi
  • Journal Title: EPJ-Conference series Volume: -
  • Int'l Joint Research
• [Journal Article] Finding binaries from phase modulation of pulsating stars with Kepler - IV. Detection limits and radial velocity verification (2016)
  • Author(s): S. J. Murphy, H. Shibahashi, T. R. Bedding
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 461 Issue: 4 Pages: 4215-4226
  • DOI: 10.1093/mnras/stw1622
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A planet in an 840 day orbit around a Kepler main-sequence A star found from phase modulation of its pulsations (2016)
  • Author(s): S. J. Murphy, T. R. Bedding, H. Shibahashi
  • Journal Title: The Astrophysical Journal Letters Volume: 827 Issue: 1 Pages: L17-L17
  • DOI: 10.3847/2041-8205/827/1/l17
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Pulsations powered by hydrogen shell burning in white dwarfs (2016)
  • Author(s): M. E. Camisassa, A. H. Co;rsico, L. G. Althaus, H. Shibahashi
  • Journal Title: Astronomy and Astrophysics Volume: 595 Pages: A45-A45
  • DOI: 10.1051/0004-6361/201628857
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Shape of a slowly rotating star measured by asteroseismology (2016)
  • Author(s): L. Gizon, T. Sekii, M. Takata, D. W. Kurtz, H. Shibahashi, M. Bazot, O. Benomar, A. Birch, K. R. Sreenivasan
  • Journal Title: Science Advances Volume: 2
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Search for quiet stellar-mass black holes by asteroseismology from space (2019)
  • Author(s): Shibahashi, H.
  • Organizer: Stars and their Variability - observed from Space
  • Int'l Joint Research / Invited
• [Presentation] Super-Nyquist Asteroseismology with Future Space Missions (2018)
  • Author(s): Shibahashi Hiromoto
  • Organizer: PHOST "Physics of Oscillating Stars" conference
  • Int'l Joint Research / Invited
• [Presentation] Asteroseismology as a new window to statistics of binaries (2018)
  • Author(s): Shibahashi Hiromoto
  • Organizer: Workshop to celebrate Arlette Grotsch 75th birthday and her career achievements
  • Int'l Joint Research / Invited
• [Presentation] Finding binaries from phase modulation of pulsating stars with Kepler (2016)
  • Author(s): H. Shibahashi, S. Murphy, T. Bedding
  • Organizer: Wide-field variability surveys: a 21st-century perspective
  • Place of Presentation: San Pedro de Atacama, Chile
  • Year and Date: 2016-11-28
  • Int'l Joint Research
• [Presentation] The Blazhko RR Lyrae variables and phase modulation in binary systems (2016)
  • Author(s): H. Shibahashi
  • Organizer: Wide-field variability surveys: a 21st-century perspective
  • Place of Presentation: San Pedro de Atacama, Chile
  • Year and Date: 2016-11-28
  • Int'l Joint Research
• [Presentation] Pulsational instability of high-luminosity H-rich pre-white dwarf stars (2016)
  • Author(s): L. M. Calcaferro, A. H. Corsico, M. E. Camisassa, L. G. Althaus, H. Shibahashi
  • Organizer: Wide-field variability surveys: a 21st-century perspective
  • Place of Presentation: San Pedro de Atacama, Chile
  • Year and Date: 2016-11-28
  • Int'l Joint Research
• [Presentation] Finding binaries from phase modulation of pulsating stars with Kepler (2016)
  • Author(s): H. Shibahashi, S. Murphy, T. Bedding
  • Organizer: Chile-Japan academic forum 2016 at Patagonia
  • Place of Presentation: Punta Arenas and Puerto Natales, Chile
  • Year and Date: 2016-11-07
  • Int'l Joint Research
• [Presentation] The Blazhko RR Lyrae variables and phase modulation in binary systems (2016)
  • Author(s): H. Shibahashi
  • Organizer: Understanding the roles of rotation, pulsation and chemical peculiarities in the upper main sequence
  • Place of Presentation: Lake District, UK
  • Year and Date: 2016-09-11
  • Int'l Joint Research