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2007 Fiscal Year Final Research Report Summary

Extra-solar planet search by radial velocity measurements of stars

Research Project

Project/Area Number 17340056
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

ANDO Hiroyasu  National Astronomical Observatory of Japan, Optical and Infrared division, Professor (90111559)

Co-Investigator(Kenkyū-buntansha) NOGUCHI Kunio  National Astronomical Observatory of Japan, Subaru telescope, Professor (10111824)
HIDAI Masahide  Tokai University, Center of general education, Professor (90173179)
TAKEDA Yoichi  National Astronomical Observatory of Japan, Optical and Infrared Astronomy division, Associate Professor (50373189)
IZUMIURA Hideyuki  National Astronomical Observatory of Japan, Okayama Astrophysical Observatory, Assistant Professor (00211730)
BUNEI Sato  Tokyo Institute of Technology, Global Edge Research Institute, Assistant Professor (40397823)
Project Period (FY) 2005 – 2007
KeywordsExtra-solar Planet Search / Oriain and evolution of planets / G-type giants / Space science / Astronomy
Research Abstract

In this three-year project, we have completed the extra-solar planet search program, that is, we tried to pick up the planet candidates by radial velocity observation of 300 G-giants with Subaru telescope (HDS), and followed up the radial velocity variations of these candidates with HIDES high dispersion spectrograph at Okayama Astrophysical Observatory, NAOCCES at Xinglong station in China, and HOES at Hugen san in Korea. As a result, we discovered 5 exoplanets and 1 brown dwarf, whose results were published in refereed journals. In addition to this, we submitted a paper on the discovery of 4 exoplanets. It is quite rare even in the world that one group accomplished the discovery of about 10 exoplanets, and we are now in a good position to discuss on the planet formation in intermediate mass stars. In a preliminary analysis, orbital periods of these planets are shown to be longer than 100days, and there seems to be a lower limit in orbital period for stars of intermediate mass range, … More which is a different situation from the planets around dwarf stars like the Sun. If this is true, it gives a certain limit on planet formation scenario. Increase of these sample might lead to give a firm foundation on this scenario. It is also shown that metallicity in the planet hovering stars is higher than that in non-hovering stars, which is a confirmation of the previous works.
Scientists of Japan, China, and Korea had two workshops at Hakone in Japan in 2006 and at Lijiang in China in 2007, respectively. In these meeting, we presented the observational results and discussed on the observational plans, and developed the software concerning radial velocity reduction. In particular, we achieved a tremendous progress in improving accuracy of radial velocity measurement. Previous precision, 5m/s at Okayama and 9m/s at Hugen san are much improved into 2m/s and 4m/s, respectively. Our intensive discussion during these workshops could lead to the mutual understandings that it is important that instrumental profile (IP) of the spectrograph should not change over the relevant wavelength, and the sampling points for IP should be increased in a sense of over sampling, that is, use of CCD with a small pixel size. Accuracy at Xinglong in China was not improved into less than 10m/s, but we are confident about how to improve radial velocity accuracy in futur.
Based on these results, we are considering increase in number of exoplanets around G-giants and based on the reinforced statistical data we try to understand planet formation Less

  • Research Products

    (32 results)

All 2008 2007 2006 2005

All Journal Article (25 results) (of which Peer Reviewed: 13 results) Presentation (6 results) Book (1 results)

  • [Journal Article] A substellar Companion to the Intermediate-Mass Giant 11 Comae2008

    • Author(s)
      Liu, Y.J., Sato, B., et. al.
    • Journal Title

      Astrophysical Journal672, 553-557, 2008 672

      Pages: 553-557

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Development of Iodine Cells for Subaru HDS and Okayama HIDES.III An Improvement on the Radial-Velocity Measurement Technique2008

    • Author(s)
      Kambe, E., Ando, H, et, et. al.
    • Journal Title

      Publ.Astron.Soc.Japan 60

      Pages: 45-53

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] A substellar Companion to the Intermediate Mass Giant 11 Comae2008

    • Author(s)
      Liu, Y. J., Sato, B., et. al.
    • Journal Title

      Astrophysical Journal 672

      Pages: 553-557

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Development of Iodine Cells for Subaru HDS and Okayama HIDES. III An Improvement on the Radial-Velocity Measurement Technique2008

    • Author(s)
      Kambe, E., Ando, H, et. al.
    • Journal Title

      Publ. Astron. Soc. Japan 60

      Pages: 45-53

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] HAT-P-1b:A Large-Radius,Low-Density Exoplanet Transiting One Member of a Stellar Binary2007

    • Author(s)
      Bakos, G.A., Sato, B.
    • Journal Title

      Astrophys.J. 656

      Pages: 552-559

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database2007

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ.Astron.Soc.Japan 59

      Pages: 335-356

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] High-Resolution and High-S/N Spectrum Atlas of Vega2007

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ.Astron.Soc.Japan 59

      Pages: 245-261

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] A Planetary Companion to the Hyades Giant Epsiron Tau2007

    • Author(s)
      Sato, B., et. al.
    • Journal Title

      Astrophysical Journal 661

      Pages: 527-531

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Five Intermediate-Period Planets from the N2K Sample2007

    • Author(s)
      Fisher, D.A.,.., Sato, B., et. al.
    • Journal Title

      Astrophysical Journal 669

      Pages: 1336-1344

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System TrES-12007

    • Author(s)
      Narita, N.,.., Sato, B., et. al.
    • Journal Title

      Publ.Astron.Soc.Japan 59

      Pages: 763-770

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] HAT-P-1b : A Large-Radius, Low-Density Exoplanet Transiting One Member of a Stellar Binary2007

    • Author(s)
      Bakos, G. A., Sato, B.
    • Journal Title

      Astrophys. J. 656

      Pages: 552-559

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database2007

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ. Astron. Soc. Japan 59

      Pages: 335-356

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] High-Resolution and High-S/N Spectrum Atlas of Vega2007

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ. Astron. Soc. Japan 59

      Pages: 245-261

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A Planetary Companion to the Hyades Giant Epsiron Tau2007

    • Author(s)
      Sato, B., et. al
    • Journal Title

      Astrophysical Journal 661

      Pages: 527-531

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Five Intermediate-Period Planets fron the N2K Sample2007

    • Author(s)
      Fisher, D. A., Sato, B., et. al
    • Journal Title

      Astrophysical Journal 669

      Pages: 1336-1344

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System TrES-12007

    • Author(s)
      Narita, N., Sato, B., et. al.
    • Journal Title

      Publ. Astron. Soc. Japan 59

      Pages: 763-770

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] On the Spectroscopic Determination of Atmospheric Parameters and O/Fe Abundances of RR Lyrae Stars2006

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ.Astron.Soc.Japan 58

      Pages: 389-406

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] HE 1327-2326,an Unevolved Star with [Fe/H]<-5.0.I.A Comprehensive A bundance Analysis2006

    • Author(s)
      Aoki, W.
    • Journal Title

      Astrophys.J. 639

      Pages: 897-917

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] On the Spectroscopic Determination of Atmospheric Parameters and 0/Fe Abundances of RR Lyrae Stars2006

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ. Astron. Soc. Japan 58

      Pages: 389-406

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] HE 1327-2326, an Unevolved Star with[Fe/H] <-5.0. I. A Comprehensive Abundance Analysis2006

    • Author(s)
      Aoki, W.
    • Journal Title

      Astrophys. J. 639

      Pages: 897-917

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The N2K Consortium.II.A Transiting Hot Saturn around HD 149026 with a Large Dense Core2005

    • Author(s)
      Sato, B
    • Journal Title

      Astrophys.J 633

      Pages: 465-473

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Non-LTE Line-Formation and Abundances of Sulfur and Zinc in F,G,and K Stars2005

    • Author(s)
      Takeda, Y
    • Journal Title

      Publ.Astron.Soc.Japan 57

      Pages: 751-768

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] An East-Asian Extra-Solar Planet Search Network2005

    • Author(s)
      Izumiura, H.
    • Journal Title

      Journal of the Korean Astronomical Society 38

      Pages: 81-84

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] The N2K Consortium. II. A Transiting Hot Saturn around HD 149026 with a Large Dense Core2005

    • Author(s)
      Sato, B
    • Journal Title

      Astrophys. J 633

      Pages: 465-473

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Non-LTE Line-Formation and Abundances of Sulfur and Zinc in F, G, and K Stars2005

    • Author(s)
      Takeda, Y.
    • Journal Title

      Publ. Astron. Soc. Japan 57

      Pages: 751-768

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] トルコRTT1.5m望遠鏡による系外惑星探索とヨードセル装置の開発2008

    • Author(s)
      佐藤 文衛
    • Organizer
      日本天文学会
    • Place of Presentation
      国立オリンピック記念青少年総合センター
    • Year and Date
      2008-03-25
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Development of Iodine cell and Exoplanet search witl Turkish RTT 1.5m telescope2008

    • Author(s)
      Sato, B.
    • Organizer
      Astronomical Society of Japan
    • Year and Date
      2008-03-23
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 太陽型星HD171156におけるエキセントリック・ホットジュピターの発見2007

    • Author(s)
      佐藤 文衛
    • Organizer
      日本天文学会
    • Place of Presentation
      岐阜大学
    • Year and Date
      2007-09-28
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Discovery of eccentric not Juin-tor in solar-type star2007

    • Author(s)
      Sato, B.
    • Organizer
      Astronomicai Society of Japan
    • Year and Date
      2007-09-28
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 2006/2007 Procyon Big Campaign:岡山での観測と視線速度解析2007

    • Author(s)
      神戸 栄治, 安藤 裕康, ほか
    • Organizer
      日本天文学会
    • Place of Presentation
      岐阜大学
    • Year and Date
      2007-09-26
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] 2006/2007 Procyon big campaign Observation and redial velocity analysis at Okayama2007

    • Author(s)
      Kambe, E., Ando, H., et. al.
    • Organizer
      Astronomical Society of Japan
    • Year and Date
      2007-06-26
    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Workshop on Astronomy with Precise Radial Velocity Measurements-Current status and its future East Asia-,2007

    • Author(s)
      Ando, H.
    • Total Pages
      1-248
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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