Notes for tau Boo

by Jean Schneider

update: 24 September 2002

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The planet(s):

• Detection method: Radial Velocity
• Basic data:

  Name:	Tau-Boo
  M.sini:	4.09 MJ
  Semi-major axis:	0.05 AU
  Orbital period:	3.312 d.
  Eccentricity:	0.
  Omega (deg):	82
  T_peri (JD-2450000):	-1622.09
  Inclinaison:	-

• Remarks:
  1. 22 September 2000: the planet not so bright as previously announced (Cameron et al).
  2. Exhibits coherent variations in residual velocities consistent with additional companion.
     24 Jul. 00: the source of RV variation remains speculative, depending on completion of one full orbit (Fischer et al 2000).
  3. `Probable detection' of the reflected star-light by the planet (Cameron et. al, 1999). The albedo is claimed to be detected only from 456 to 524 nm.
  4. Charbonneau et al. (1999) find a low albedo (0.3) near 480nm,
  5. S. Horner et al. (1997) write:
     ` The AFOE group has confirmed the radial velocity variations in 51 Peg and tau Boo. Here we discuss the results of a search for evidence of pulsations in the AFOE data, as well as attempt to clear up misconceptions regarding pulsations circulated as a result of the current debate about the nature of 51 Peg RV variations.'
  6. An excess velocity scatter, about twice as large as their expected measurement error, was first found by Duquennoy and Mayor (1991).
     Historical Note: Geoff Marcy and Paul Butler found the 3.3 day periodicity in their data from theSan Fransisco Planet Search Project. Their measurement errors are 14 m/s for this object, yielding a 40 sigma detection, and definitively demonstrating Keplerian motion. The day after they put their results on the web, Mayor and Queloz were able to confirm the periodicity with 15 years of CORAVEL data (measurement errors ~ 300 m/s), including the original Duquennoy and Mayor (1991) data and an additional 5 years of CORAVEL data. ( Thanks to Paul Butler)
  7. No pulsation seen by AFOE in high resolution spectra (Horner 1997)
  8. The star has a companion ( GJ 527B) about 240 AU away.

• References:
  1. BALIUNAS S., HENRY, G.W., DONAHUE R.A., FEKEL F.C. & SOON W.H., 1997
     Properties of sun-like stars with planets. II rho CNC, tau BOO and ups AND
     ApJ Letters, 474, L119
     paper
  2. BODENHEIMER P., LIN D. & MARDLING R., 2000b
     On the Tidal Inflation of Short-Period Extrasolar Planets.
     ApJ., submitted
     preprint with Fig 1, Fig 2, Fig 3 and Fig 4
  3. BROWN T., KOTAK R., HORNER S., KENELLY E., KORZENNIK S., NISENSON P. & NOYES R., 1997
     A search for line shape and variations in 51 Pegasi and tau Boötis.
     ApJ. Lett., submitted
  4. BURROWS A. & ANGEL R., 1999
     Extrasolar planets: Direct detection at last .
     Nature, 402, 732
     paper
  5. BUTLER P. & MARCY G., 1997
     The Lick Observatory Planet Search
     Submitted to: Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium No. 161, Capri 1-5 July 1996, eds. C.B. Cosmovici, S. Bowyer, and D. Werthimer
     preprint
  6. BUTLER P., MARCY G., WILLIAMS E., HAUSER H. & SHIRTS P., 1997
     Three new "51 Peg-type" planets
     ApJ Letters, 474, L115
     abstract and paper
  7. CAMERON A., HORNE K., PENNY A. & JAMES D., 1999
     Probable detection of starlight reflected from the giant exoplanet orbiting tau Bootis.
     Nature, 402, 751
     paper (and full text)
  8. CAMERON A., HORNE, JAMES D., PENNY A. & SEMEL M., 2000
     tau Boo b: Not so bright, but just as heavy.
     in Planetary Systems in the Universe, AU Symp 202, eds. Penny, Artymowicz, Lagrange, Russell.
     paper
  9. CHARBONNEAU D., NOYES R., KORZENNIK S., NIESENSON P., JHA S., VOGT S. & KIBRICK R., 1999
     An upper limit on the reflected light from the planet orbiting the star tau Bootis
     ApJ. Letters, 522, L145
     paper
  10. DEMING D., WIEDEMAN G. & BJORAKER G., 2000a
      A Sensitive Search for Methane in the Infrared Spectrum of Tau Bootis.
      in 196^th AAS Meeting.
      abstract
  11. DEMING D., WIEDEMAN G. & BJORAKER G., 2000b
      A Sensitive Search for Methane in the Infrared Spectrum of Tau Bootis.
      ApJ., accepted
      preprint
  12. DUQUENNOY and MAYOR, 1991
      Multiplicity among solar-type stars in the solar neighbourhood. II - Distribution of the orbital elements in an unbiased sample
      Astron. & Astrophys., 248, 485
      (abtract)
  13. FISCHER D., MARCY G., BUTLER P., VOGT S., FRINK S. & APPS K., 2000
      Planetary Companions to HD 12661, HD 92788, HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets.
      ApJ, submitted
      
  14. GIMENEZ A., 2000
      ubvy Photometry of stars with planets.
      Astron. & Astrophys., 356, 213.
      paper
  15. HORNER S., BROWN T., KENELLY E., NOYES R., JHA S., KORZENNIK S. & NISENSON P., 1997 51 Pegasi and Tau Bootis: Planets or Pulsations?
      Poster at the Los Alamos Conference on Stellar Pulsation June 16-20.
  16. RYAN S, 2000
      The Host Stars of Extrasolar Planets Have Normal Lithium Abundances.
      MNRAS, in press preprint
  17. SINCELL M., 1999
      Shadow and Shine Offer Glimpses of Otherworldly Jupiters.
      Science, 286, 1822.
      paper
  18. TAKEDA Y., SATO B., KAMBE E., AOKI W., HONDA S., KAWANOMOTO S., MASUDA S., IZUMIURA H., WATANABE E., KOYANO H., MAEHARA H., NORIMOTO Y., OKADA T., SHIMIZU Y., URAGUCHI F., YANAGIZAWA K. YOSHIDA M., NIYAMA S. & ANDO H., 2001
      Photospheric Abundances of Volatile and Refractory Elements in Planet-Harboring Stars.
      PASJ, 53, 1211
      paper
  19. WIEDEMANN G., DEMING D. & BJORAKER G., 2000
      Sensitive search for methane in the infrared spectrum of tau Bootis.
      ApJ, 546, 1068
      paper
  20. ZHAO G., CHEN Y., QIU H. & LI. Z., 2002
      Chemical Abundances of 15 Extrasolar-Planet Host Stars.
      Astron. J., 124, 2224
      paper

• Other Web pages:
  • Comments by Michel Mayor
  • Velocity curve (Butler et al.)
  • further data with the AFOE instrument (Pennsylvania)
  • Animation on the spectral signature of a close exo-planet (A. Cameron)

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The star:

• Distance: 15 pc
• Spectral type: F7V
• Apparent magnitude: B = 4.98, V = 4.50
• Coordinates (2000): RA = 13 47 17.345, DEC = +17 27 22.31
• Metallicity: [Fe/H] = 0.28
• Mass (M_sun): M = 1.3
• More data:
  • Basic Data (from simbad )
  • Most recent refs. (from ADS; enter `Tau Boo' in the `objects' field)

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