Notes for 55 Cnc

update: 4 May 2005

The planet(s):

• Detection method: Radial Velocity
• Basic data:

  Name:	55 CnC e	55 CnC b	55 CnC c	55 CnC d
  M.sini:	0.045 ± 0.01 MJ = 14.2 ± 2.95 ME	0.784 ± 0.09 MJ	0.217 ± 0.04 MJ	3.92 ± 0.5 MJ
  Semi-major axis:	0.038 ± 0.001 AU	0.115 ± 0.003 AU	0.240 ± 0.005 AU	5.257 ± 0.9 AU
  Orbital period:	2.81 ± 0.002 d.	14.67 ± 0.0006 d.	43.93 ± 0.021 d.	4517.4 ± 77.8 d.
  Eccentricity:	0.174 ± 0.127	0.0197 ± 0.01	0.44 ± 0.08	0.327 ± 0.28
  Omega (deg):	261.65 ± 41	131.49 ± 33	244.39 ± 11	234.73 ± 7
  T_peri (JD-2450000):	3295.31 ± 0.32	3021.08 ± 0.01	3028.63 ± 0.25	2837.69 ± 68.87
  Inclination:	-	-	-

• Remarks:
  
  1. 24 mar. 05: Planet e challanged; Neptune-sized planet at ~ 0.8 AU? (Wisdom, 2005)
  2. 20 apr. 03: Planet in wide (a ~ 1065 AU) binary system (Eggenberger et al 2003)
  3. 12 Feb. 03 55 Cnc is one of the 5 targets of the 14 Feb. 03 "Cosmic Call" initiative
  4. 13 Jun. 02 Periodicity at 44 d. could be due to stellar rotation, but the planet interpretation is more likely (Marcy et al 2002)
  5. 4 Dec. 01:From astrometry with HST (McGrath et al 2002), M < 30 M_J
  6. 22 Nov. 00: From astrometry (Han et al. 2000) claim a preliminary mass of 126 M_J and inclination of 179.6^o
  7. 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).
  8. Possible second companion; see Butler et al. 1996, Jayawardhana et al. 2000.
  9. 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)
  10. The star has a companion (rho Cnc B) about 1150 AU away
• References:
  • McARTHUR B., 2005
    Detection of a Neptune-Mass Planet in the Rho1 Cancri.
    in Planet Formation and Detection., Aspen 2005
    paper
  • McARTHUR B., ENDL M., COCHRAN W., BENEDICT F., FISCHER D., MARCY G., BUTLER P., NAEF D., MAYOR M;, QUELOZ D., UDRY S. & HARRISON T., 2004
    Detection of a Neptune-Mass Planet in the rho¹ Cancri System using the Hobby-Eberly Telescope
    ApJ. Letters, 614, L81
    paper
  • 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
  • BARAFFE I., CHABRIER G., BARMAN T., SELSIS F., ALLARD F. & HAUSCHILDT P., 2005
    Hot-Jupiters and hot-Neptunes: a common origin?
    Astron. & Astrophys., accepted
    preprint
  • BARNES R. & QUINN Th., 2004
    The (In)Stability of Planetary Systems.
    ApJ., submitted
    preprint
  • 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
  • BRUNINI A. & CIONCO R., 2005
    The Origin and Nature of Neptune-like Planets Orbiting Close to Solar Type Stars.
    Icarus, in press
    preprint
  • BURROWS A., SUDARSKY D. & HUBENY I., 2004
    Spectra and Diagnostics for the Direct Detection of Wide-Separation Extrasolar Giant Planets.
    ApJ. , submitted
    preprint
  • 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
  • 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
  • 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.
    
  • FRANCK S., BOUNAMA C., von BLOH W. & CUNTZ M., 2004
    Dynamical Habitability in the Extrasolar Planetary Systems 47 UMa and 55 Cnc.
    BAAS, 36 no 2., #1.01
    abstract 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
  • 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
  • HAN I., BLACK D. & GATEWOOD G., 2000
    Preliminary astrometric masses for proposed exrasolar planetary companions.
    ApJ. Letters, 548, L57
    paper
  • HOLMES E. & BEICHMAN C., 2003
    Modeling Structure in Hypothetical Debris Disks Around Two Systems with Known Planets.
    BAAS, 35, issue 4, N. 18.07
    abstract
  • 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
  • JI J., KINOSHITA H., LIU L. & LI G., 2003
    Could the 55 Cnc Planetary System Really Be in the 3:1 Mean Motion Resonance?
    ApJ. Letters, 585, L139
    paper
  • JI J., LIU L., KINOSHITA H., LI G. & NAKAI H., 2004
    The Stability Analysis of the Extrasolar Planetary Systems.
    in IAU Symposium 219: Stars as Suns: Activity, Evolution, and Planets, eds. A. K. Dupree & A. Benz
    paper
  • KLEY W., 2003
    Dynamical Evolution of Planets in Disks.
    in Proc. of IAU Colloquium 189, Astrophysical Tides
    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., 581, 1375
    paper
  • MARZARI F., SCHOLL H. & TRICARICO P., 2005
    Stability of the 3:1 Resonance Locking in the 55 Cancri Planetary System.
    in 36th Annual Lunar and Planetary Science Conference, abstract no.1289
    abstract
  • 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
  • RAYMOND S. & BARNES R., 2004 Predicting Planets in Known Extra-Solar Planetary Systems III: Forming Terrestrial Planets.
    ApJ, submitted
    preprint
  • RAYMOND S. & BARNES R., 2004a Predicting Planets in Known Extra-Solar Planetary Systems II: Testing for Saturn-Mass Planets.
    ApJ, accepted
    preprint
  • 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
  • SCHOLL H. & MARZARI F., 2004
    55 Cancri: A Planetary System on the Edge of Chaos.
    ApJ. Letters, submitted
  • 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
  • VON BLOH W., CUNTZ M., FRANCK S. & BOUNAMA C., 2003
    On the Possibility of Earth-type Habitable Planets in the 55 Cancri System.
    Astrobiology, submitted
  • WISDOM J., 2005
    Evidence of a Neptune-Sized Planet in the \rho^1 Cancri System.
    ApJ. Letters, submitted
    preprint
  • 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.)
  • Hobby-Eberly Telescope data
  • Image of the cirumstellar disk (Trilling & Brown).

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)