Notes for GJ 436

update: 4 May 2005

The planets:

• Detection method: Radial Velocity
• Basic data:

  Name:	GJ 436 b
  M.sini:	0.067 ± 0.007 MJ
  Semi-major axis:	0.0278 AU
  Orbital period:	2.6441 ± 0.0005 d.
  Eccentricity:	0.12 ± 0.06
  Omega (deg):	332 ± 11
  T_peri (JD-2450000):	1551.507 ± 0.03
  Inclination:	-

• Remarks:
• References:
  1. 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
  2. BRUNINI A. & CIONCO R., 2005
     The Origin and Nature of Neptune-like Planets Orbiting Close to Solar Type Stars.
     Icarus, in press
     preprint
  3. BUTLER P., VOGT S., MARCY G., FISCHER D., WRIGHT J., HENRY G., LAUGHLIN G. & LISSAUER J., 2004
     A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436
     ApJ. Letters, 617, 580
     paper
  4. ENDL M., COCHRAN W., TULL R., & MacQUEEN Ph., 2003
     A Dedicated M-Dwarf Planet Search Using The Hobby-Eberly Telescope.
     Astron. J., 126, 3099
     paper
  5. SANTOS N., BOUCHY F., MAYOR M., PEPE F., QUELOZ D., UDRY S., LOVIS C., BAZOT M., BENZ W., BERTAUX J.-L., LO CURTO G., DELFOSSE X., MORDASINI C., NAEF D., SIVAN J.-P. & VAUCLAIR S., 2004
     The HARPS survey for southern extrasolar planets. II A 14 Earth-masses exoplanet around mu Arae
     Astron. & Astrophys., 426, L19
     paper

• Other Web pages:
  • California & Carnegie Planet Search data

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  The star:

  • Distance: 10.2 pc
  • Spectral type: M2.5
  • Apparent magnitude: B = 12.20, V = 10.68
  • Absolute luminosity:
  • Coordinates (2000): RA = 11 42 11.0941, DEC = +26 42 23.652
  • Metallicity: [Fe/H] = +0.25 ?
  • Mass (M_sun): M = 0.41 ± 0.05
  • More data:
    • Basic Data (from Simbad)
    • Most recent refs. (from ADS; enter `GJ 436' in the `objects' field)

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