Greg Henry has discovered photometric brightness variations that have the same period as the velocities. This implies that the velocity variations may be caused by starspots and chromospheric active regions on the stellar surface, rotating into and out of view as the star spins on axis.
Measurements of line bisectors suggest that the planet is real, as described in, `` The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD192263"
Authors: N.C. Santos, S. Udry , M. Mayor , D. Naef ,
F. Pepe , D. Queloz , G. Burki , N. Cramer , B. Nicolet
Accepted for publication in Astronomy & Astrophysics
A False Planet Around HD 192263 (G.Henry, S.Baliunas, R.Donahue). Santos, Mayor, Naef, et al.:
2000, Astron. & Astrophys., p356, v599
Vogt et al. 2000, ApJ, 536, 902
CaII K-line for HD 192263
``The CORALIE survey for Southern extra-solar planets. III.
A giant planet in orbit around HD 192263''
Chromospheric Activity of HD 192263
(Spectrum from Keck Observatory, HIRES spectrometer)
| Spectral Type | Mass (M_sun) |
Apparent magnitude |
Distance (pc) |
P_rot (d) |
[Fe/H] | |
| K0V | 0.79 | 7.79 | 19.9 | 24. (G.Henry) | -0.20 |