Notes for tau Boo

update: 22 April 2005

The planet(s):

Detection method: Radial Velocity

Basic data:

Name:	Tau-Boo
M.sini:	4.13 M_J
Semi-major axis:	0.05 AU
Orbital period:	3.312 d.
Eccentricity:	0.01
Omega (deg):	65
T_peri (JD-2450000):	-1622.28
Inclination:	-

Remarks:
1. 10 sep. 03: New upper limit of 0.39 for the reflection albedo (Leigh et al 2003)
2. 20 apr. 03: Planet in wide (a ~ 240 AU) binary system (Eggenberger et al 2003)
3. 22 spt. 2000: the planet not so bright as previously announced (Cameron et al).
4. 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).
5. `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.
6. Charbonneau et al. (1999) find a low albedo (0.3) near 480nm,
7. 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.'
8. 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)
9. No pulsation seen by AFOE in high resolution spectra (Horner 1997)
10. 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. BEICHMAN C., BRYDEN G., PIEKE G., STANSBERRY J., TRILLING D., STAPELFELDT K., WERNER M., ENGELBRECHT C., BLAYLOCK M., GORDON K., CHEN C., SU K. & HINES D., 2004
  Planets and IR Excesses: Preliminary Results from a Spitzer MIPS Survey of Solar-Type Stars.
  ApJ. , 622, 1160
  paper
3. 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
4. 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
5. BURROWS A. & ANGEL R., 1999
  Extrasolar planets: Direct detection at last .
  Nature, 402, 732
  paper
6. 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
7. BUTLER P., MARCY G., WILLIAMS E., HAUSER H. & SHIRTS P., 1997
  Three new "51 Peg-type" planets
  ApJ Letters, 474, L115
  abstract and paper
8. 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)
9. 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
10. 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
11. 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
12. DEMING D., WIEDEMAN G. & BJORAKER G., 2000b
  A Sensitive Search for Methane in the Infrared Spectrum of Tau Bootis.
  ApJ., accepted
  preprint
13. DOBBS-DIXON I., LIN D. & MARDLING R., 2002
  Spin-Orbit Evolution of Short Period Planets.
  ApJ., 610, 464
  paper
14. 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
  paper
15. EGGENBERGER A., UDRY S. & MAYOR M., 2003
  Planets in binaries.
  in Scientific Frontiers in Research on Extrasolar Planets, ASP Conference Series. D.Deming and S.Seager, eds.
  paper
16. 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, 551, 1107
  paper
17. GIMENEZ A., 2000
  ubvy Photometry of stars with planets.
  Astron. & Astrophys., 356, 213.
  paper
18. GREAVES J., HOLLAND W., JAYAWARDHANA R.,DENT W., WYATT M ., 2004
  A search for debris discs around stars with giant planets.
  MNRAS, 348, 1078
  paper
19. 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.
20. LEIGH C., COLLIER CAMERON A., HORNE K., PENNY A. & JAMES D., 2003
  A new upper limit on the reflected starlight from Tau Bootis b.
  MNRAS,344, 1271
  paper
21. MUSIELAK Z., STUFF T. & CUNTZ M., 2005
  Stability of planetary orbits in binary systems.
  Astron. & Astrophys., 434, 355
  paper
22. PREUSSE S., KOPP A., BÜCHNER J. & MOTSCHMANN U., 2005
  Stellar wind regimes of close-in extrasolar planets.
  Astron. & Astrophys., 434, 1191
  paper
23. RYAN S, 2000
  The Host Stars of Extrasolar Planets Have Normal Lithium Abundances.
  MNRAS, in press preprint
24. SHKOLNIK E., WALKER G. BOHLENDER D., GU P. & KURSTER M., 2004
  Hot Jupiters and Hot Spots: The Short- and Long-term Chromospheric Activity on Stars with Giant Planets.
  ApJ, accepted
  preprint
25. SINCELL M., 1999
  Shadow and Shine Offer Glimpses of Otherworldly Jupiters.
  Science, 286, 1822.
  paper
26. STEVENS I., 2004
  Magnetospheric Radio Emission from Extrasolar Giant Planets: The Role of the Host Stars.
  MNRAS, in press
  preprint
27. 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
28. WIEDEMANN G., DEMING D. & BJORAKER G., 2000
  Sensitive search for methane in the infrared spectrum of tau Bootis.
  ApJ, 546, 1068
  paper
29. 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)

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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