Notes for 70 Vir

update: 29 March 2005

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:	7.44 M_J
Semi-major axis:	0.48 AU
Orbital period:	116.689 d.
Eccentricity:	0.40 ± 0.01
Omega (deg):	358
T_peri (JD-2450000):	40.26
Inclination:	-

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. 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
2. 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
3. GIMENEZ A., 2000
  ubvy Photometry of stars with planets.
  Astron. & Astrophys., 356, 213.
  paper
4. 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
5. HAN I., BLACK D. & GATEWOOD G., 2000
  Preliminary astrometric masses for proposed exrasolar planetary companions.
  ApJ. Letters, ApJ. Letters, 548, L57
  paper
6. 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
7. LAWS Ch., GONZALEZ G., WALKER K., TYAGI S., DODSWORTH J., SNIDER K. & SUNTZEFF N., 2003
  Parent Stars of Extrasolar Planets VII: New Abundance Analyses of 30 Systems.
  Astron. J., accepted
  preprint
8. 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)
9. MARCY GEOFFREY W. & BUTLER R. PAUL, 1996
  A Planetary Companion to 70 Virginis
  ApJ. Letters, 464, L147
  (paper)
10. 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).
11. RYAN S, 2000
  The Host Stars of Extrasolar Planets Have Normal Lithium Abundances.
  MNRAS, in press preprint
12. 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
13. 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)

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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