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J/ApJ/634/625     Radial velocities and photometry of GJ 876     (Rivera+, 2005)
A ∼7.5 M(Earth) planet orbiting the nearby star, GJ 876.
    Rivera E.J., Lissauer J.J., Butler R.P., Marcy G.W., Vogt S.S.,
    Fischer D.A., Brown T.M., Laughlin G., Henry G.W.
   <Astrophys. J. 634, 625 (2005)>
   =2005ApJ...634..625R
ADC_Keywords: Radial velocities ; Stars, nearby ; Photometry

Keywords: planetary systems - planets and satellites: general -
          stars: individual (GJ 876)

Abstract:
    High-precision, high-cadence radial velocity monitoring over the past
    8yr at the W. M. Keck Observatory reveals evidence for a third planet
    orbiting the nearby (4.69pc) dM4 star GJ 876. The residuals of
    three-body Newtonian fits, which include GJ 876 and Jupiter-mass
    companions b and c, show significant power at a periodicity of
    1.9379days. Self-consistently fitting the radial velocity data with a
    model that includes an additional body with this period significantly
    improves the quality of the fit.

Description:
    We present results of N-body fits to the radial velocity data taken at
    the W.M. Keck telescope from 1997 June to 2004 December.
Objects:
    -----------------------------------------------
       RA   (2000)   DE      Designation(s)
    -----------------------------------------------
    22 53 16.7   -14 15 49   GJ 876 = V* IL Aqr
    22 49 26.5   -11 20 57   HD 216018 = BD-12 6357
    23 09 49.5   -14 30 38   HD 218639 = BD-15 6360
    -----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        23      155   Measured Velocities for GJ 876 (Keck)
table5.dat        33      371   Photometric observations of GJ 876


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 10  F10.3 d       HJD       Heliocentric Julian Date
  12- 18  F7.2  m/s     RV        Radial velocity
  20- 23  F4.2  m/s     e_RV      Error in RV


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1- 12  F12.4 ---     HJD       Heliocentric Julian Date
  14- 19  F6.4  mag     P-C1      Program-Comp 1 differential mag in (b+y)/2 (1)
  21- 26  F6.4  mag     P-C2      Program-Comp 2 differential mag in (b+y)/2 (1)
  28- 33  F6.4  mag     C1-C2     Comp 1-Comp 2 differential mag in (b+y)/2 (1)

Note (1): We used HD 216018 (V=7.62, B-V=0.354) as our primary comparison
     star (C1) and HD 218639 (V=6.43, B-V=0.010) as a secondary comparison
     star (C2).


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    18-Sep-2006