Notes for 70 Vir

by Jean Schneider

update: 24 September 2002

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The planet(s):

• Detection method: Radial Velocity (part of the San Fransisco Planet Search Project (P. Butler and G. Marcy))

• Basic data:

  Name:	70 Vir b
  M.sini:	6.6 MJ
  Semi-major axis:	0.43 AU
  Orbital period:	116 d.
  Eccentricity:	0.40 ± 0.01
  Omega (deg):	358
  T_peri (JD-2450000):	40.31
  Inclinaison:	-

• Remarks:
  • 22 Nov. 00: From astrometry Han et al (2000) claim a preliminary mass of 27 M_J and inclination of 16.1^o
    
  • The object at 0.43 UA is interpreted by Mazeh et al. 1996 to be a brown dwarf, in view of its high eccentricity e = 0.4 .
  • Upper mass limit of 38 M_J given by Hipparcos (Perryman et al. 1996)
  • 120 other stars monitored by Butler and Marcy

• References:
  1. BUTLER P. & MARCY G., 1996
     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
  2. GIMENEZ A., 2000
     ubvy Photometry of stars with planets.
     Astron. & Astrophys., 356, 213.
     paper
  3. HAN I., BLACK D. & GATEWOOD G., 2000
     Preliminary astrometric masses for proposed exrasolar planetary companions.
     ApJ. Letters, accepted
     paper
  4. HENRY G., BALIUNAS S., DONAHUE R., SOON W., & SAAR S., 1997
     Properties of Sun-like Stars with Planets: 51 Pegasi, 47 Ursae Majoris, 70 Virginis, and HD114762
     Apj., 474, 503
     paper
  5. MAZEH T., MAYOR M. & LATHAM D., 1996
     Eccentricity versus mass for low-mass companions and planets.
     Submitted to ApJ.
     Preprints: Dr. T. Mazeh, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel (mazeh@wise.tau.ac.il)
  6. MARCY GEOFFREY W. & BUTLER R. PAUL, 1996
     A Planetary Companion to 70 Virginis
     ApJ. Letters, 464, L147
     (paper)
  7. PERRYMAN,M.A.C.; LINDEGREN,L., ARENOU,F., BASTIAN,U., BERNSTEIN,H.H., VAN LEEUWEN,F., SCHRIJVER,H., BERNACCA,P.L., EVANS,D.W., FALIN,J.L., FROESCHLE,M., GRENON,M., HERING,R., HOG,E., KOVALEVSKY,J., MIGNARD,F., MURRAY,C.A., PENSTON,M.J., PETERSEN,C.S., LE POOLE,R.S., SODERHJELM,S. TURON,C., 1996,
     Hipparcos distances and mass limits for the planetary candidates: 47 UMa, 70 Vir, and 51 Peg .
     Astron. & Astrophys., 310, L21
     ( abstract).

  8. RYAN S, 2000
     The Host Stars of Extrasolar Planets Have Normal Lithium Abundances.
     MNRAS, in press preprint
  9. 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
  10. 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:
  1. Velocity curve and basic data (Marcy and Butler)
  2. Visualisation of 70 Vir (John Whatmough)

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The star:

• Distance: 22 pc
• Spectral type: G4V
• Apparent magnitude: B = 5.69, V = 5.0
• Absolute luminosity:
• Coordinates (2000): RA = 13 28 26.541, DEC = +13 47 12.43
• Metallicity: [Fe/H]= -0.03
• Mass (M_sun): M= 1.10
• More data:
  • Basic Data (from simbad )
  • Most recent refs. (from ADS; enter `70 Vir' in the `objects' field)

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