Notes for 55 Cnc

by Jean Schneider

update: 24 September 2002

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The planet(s):

• Detection method: Radial Velocity
• Basic data:

  Name:	55 CnC b	55 CnC c	55 CnC d
  M.sini:	0.84 ± 0.07 MJ	0.21 ± 0.04 MJ	4.05 ± 0.4 MJ
  Semi-major axis:	0.115 ± 0.003 AU	0.241 ± 0.005 AU	5.9 ± 0.9 AU
  Orbital period:	14.653 ± 0.0006d.	44.276 ± 0.021 d.	5360 ± 400 d.
  Eccentricity:	0.020 ± 0.02	0.339 ± 0.21	.16 ± 0.06
  Omega (deg):	99. ± 35	61. ± 25	201. ± 22
  T_peri (JD-2450000):	1.479	31.4 ± 2.5	2785. ± 250
  Inclinaison:	-	-	-

• Remarks:
  
  1. 13 Jun. 02 Periodicity at 44 d. could be due to stellar rotation, but the planet interpretation is more likely (Marcy et al 2002)
  2. 4 Dec. 01:From astrometry with HST (McGrath et al 2002), M < 30 M_J
  3. 22 Nov. 00: From astrometry (Han et al. 2000) claim a preliminary mass of 126 M_J and inclination of 179.6^o
  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. Possible second companion; see Butler et al. 1996, Jayawardhana et al. 2000.
  6. The star is surrounded by a dust disk extending at least a 40 AU, with an inclination of ~ 25^o. If the planets are in the same plane than the disc, this gives to the forst planet a mas of 1.9^+1.1 _-0.4 M_J (Trilling & Brown 1998, Trilling et al 2000). But disc not confirmed by Schneider et al (2000b)
     There may by a hole with a radius of ~ 10 AU in the disk (Jayawardhana et al 2000)
  7. The star has a companion (rho Cnc B) about 1150 AU away
• References:
  • 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
  • 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
  • BUTLER P., MARCY G., WILLIAMS E., HAUSER H. & SHIRTS P., 1997
    Three new "51 Peg-type" planets
    ApJ Letters 474, L115
    paper
  • DOMINIK C., LAUREIJS R.J., JOURDAIN DE MUIZON M. & HABING H.J, 1998
    A Vega-like disk associated with the planetary system of {rho}1 Cnc.
    Astron. & Astrophys. 329, L53
    abstract and preprint
  • 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
    
  • GIMENEZ A., 2000
    ubvy Photometry of stars with planets.
    Astron. & Astrophys., 356, 213.
    paper
  • McGRATH M., NELAN E., BLACK D., GATEWOOD G., NOLL K. SCHULTZ A., LUBOW S., HAN I., STEPINSKI T. & TARGETT T., 2002
    An Upper Limit to the Mass of rho1 Cnc's Radial Velocity Companion.
    ApJ. Lett., in press
    preprint
  • GREAVES J., HOLLAND JAYAWARDHANA R. & DENT W., 1999
    Molecular gas in the 55 Cnc planetary system.
    ApJ. Letters, submitted
  • HAN I., BLACK D. & GATEWOOD G., 2000
    Preliminary astrometric masses for proposed exrasolar planetary companions.
    ApJ. Letters, accepted
    paper
  • JAYAWARDHANA R., HOLLAND W., GREAVES J., DENT W., MARCY G., HARTMANN L. & FASIO G., 2000
    Dust in the 55 Cancri planetary system.
    ApJ., 536, 425
    paper
  • JAYAWARDHANA R., HOLLAND W., KALAS P., GREAVES J., DENT W., WYATT M & MARCY G., 2002
    New Sub-millimeter Limits on Dust in the 55 Cancri Planetary System.
    ApJ. Letters., 570, L93
    paper
  • MARCY G., BUTLER P., FISCHER D., LAUGHLIN G., VOGT S., HENRY G. & POURBAIX D., 2002
    A Planet at 5 AU Around 55 Cancri
    ApJ., submitted
    preprint
  • NOVAK G., LAI D. & LIN D., 2002
    The Interesting Dynamics of the 55 Cancri System.
    in Scientific Frontiers in Research on Extrasolar Planets, Deming & Seager Eds.
    paper
  • RYAN S, 2000
    The Host Stars of Extrasolar Planets Have Normal Lithium Abundances.
    MNRAS, in press preprint
  • SCHILLING G., 1998b
    Planet Hunters Become Weight Watchers.
    Science, 282, 395
    abstract
  • SCHNEIDER G., BECKLIN E., SMITH B., WEINBERGER A., SILVERSTONE M. & HINES D., 2000b
    NICMOS Coronagraphic Observations of 55 Cancri.
    Astron. J., 121, 525
    paper
  • 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
  • TRILLING D. & BROWN R., 1998
    Imaging a Circumstellar Disk around a Star with a Radial-Velocity Planetary Companion
    in 30^th DPS Meeting
    abstract
  • TRILLING D. & BROWN R., 1998b
    A circumstellar dust disk around a star with a known planetary companion
    Nature, 395, 775
    abstract and paper with figs 1, 2 and 3
  • TRILLING D., BROWN R. & RIVKIN A., 2000
    Circumstellar Dust Disks around Stars with Known Planetary Companions.
    ApJ., 529, 499
    paper
  • 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:
  • Basic Data (Butler et al.)
  • Image of the cirumstellar disk (Trilling & Brown).

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The star:

• Distance: 13.4 pc
• Spectral type: G8V
• Apparent magnitude: 5.95
• Coordinates (2000):     RA = 08 52 37.60,      DEC = +28 20 02.6
• Metallicity: [Fe/H] = 0.29
• Mass (M_sun): M = 1.03
• More data:
  • Basic Data (from simbad )
  • Most recent refs. (Enter `55 Cnc' in the 'objects' field)

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