천문학회지 (Journal of The Korean Astronomical Society)

  • 제38권2호
  • /
  • Pages.315-318
  • /
  • 2005
  • /
  • 1225-4614(pISSN)
  • /
  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
권호 표지
DOI QR코드

DOI QR Code

OKAYAMA PLANET SEARCH PROGRAM

  • SATO BUN'EI (Graduate School of Science and Technology, Kobe University)
  • 발행 : 2005.06.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

We have carried out a precise Doppler survey of G-type giants aiming to unveil the properties of planetary systems in intermediate-mass stars ($1.5-5M_{\bigodot}$). G-type giants are promising targets for Doppler planet searches around massive stars, because they are slow-rotators and have many sharp absorption lines in their spectra and their surface activities are relatively low in contrast to their younger counterparts on the main-sequence (B-A stars). We are now monitoring radial velocities of about 300 late G-type (including early K-type) giants using HIgh Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory. We have achieved a Doppler precision of about 6-7 m/s over a time span of 3 years using an iodine absorption cell. We found that most of the targets have radial velocity scatters of ${\sigma}{\~} 10-20 m\;s^{-1}$ over 1-3 years, with the most stable reaching levels of 6-8 m $s^{-1}$. Up to now, we have succeeded in discovering the first extrasolar planet around a G-type giant star HD 104985, and also found several candidates showing significant radial velocity variations, suggesting the existence of stellar and substellar companions. Observations have continued to establish their variability.

키워드

참고문헌

  1. Butler, R. P., Marcy, G. W., Williams, E., McCarthy, C., Dosanjh, P., & Vogt, S. S., 1996, PASP, 108, 500 https://doi.org/10.1086/133755
  2. ESA., 1997, The Hipparcos and Tycho Catalogues (Noordwijk, Netherlands: ESA)
  3. Frink, S., Quirrenbach, A., Fischer, D., Roser, S., & Schilbach, E., 2001, PASP, 113, 173 https://doi.org/10.1086/318610
  4. Frink, S., Mitchell, D. S., Quirrenbach, A., Fischer, D. A., Marcy, G. W., & Butler, R.P., 2002, ApJ, 576, 478 https://doi.org/10.1086/341629
  5. Girardi, L., Bressan, A., Bertelli, G., & Chiosi, C., 2000, A&AS, 141, 371 https://doi.org/10.1051/aas:2000126
  6. Haisch, K. E., Jr., Lada, E. A., & Lada, C. J., 2001a, AJ, 121, 2065 https://doi.org/10.1086/319951
  7. Haisch, K. E., Jr., Lada, E. A., & Lada, C. J., 2001b, ApJ, 553, L153 https://doi.org/10.1086/320685
  8. Henry, G. W., Fekel, F. C.,Henry, S. M., & Hall, D. S., 2000, ApJS, 130, 201 https://doi.org/10.1086/317346
  9. Izumiura, H., 1999, in Proc. 4th East Asian Meeting on Astronomy, ed. P.S. Chen (Kunming: Yunnan Observatory), 77
  10. Kambe, E. et al., 2002, PASJ, 54, 865 https://doi.org/10.1093/pasj/54.6.865
  11. Mitchell, D. S., Frink, S., Quirrenbach, A., Fischer, D., Marcy, G. W., & Butler, R. P., 2004, BAAS, 35, 1127
  12. Pollack, J. B., Hubickyj, O., Bodenheimer, P., Lissauer, J. J., Podolak, M., & Greenzweig, Y., 1996, Icarus, 124, 62 https://doi.org/10.1006/icar.1996.0190
  13. Sato, B., et al., 2003, ApJ, 597, L157 https://doi.org/10.1086/378267
  14. Sato, B., Kambe, E., Takeda, Y., Izumiura, H., & Ando, H., 2002, PASJ, 54, 873 https://doi.org/10.1093/pasj/54.6.873
  15. Sato, B., Kambe, E., Takeda, Y., Izumiura, H., Masuda, S., & Ando, H., 2005, PASJ, 57, in press
  16. Setiawan, J., et al., 2003a, A&Ap, 398, L19 https://doi.org/10.1051/0004-6361:20021846
  17. Setiawan, J., 2003b, in Towards Other Earths, DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, held in Heidelberg, Germany, 22-25 April, ESA SP-539, ed. M. Fridlund, & T. Henning, 595
  18. Takeda, Y, Sato, B., Kambe, E., Izumiura, H., Masuda, S., & Ando, H., 2005, PASJ, 57, in press
  19. Valenti, J.A., Butler, R.P., & Marcy, G. W., 1995, PASP, 107, 966 https://doi.org/10.1086/133645