AAS 201st Meeting, January, 2003
Session 46. Planetary Systems: Observations and Models
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[46.16] Further Evidence for Planet-Star Interaction in Five Short-Period Systems

E. Shkolnik, G.A.H. Walker (UBC), D.A. Bohlender (HIA/NRC)

Further observations in 2002 confirm the synchronous enhancement with the short-period planetary orbit in HD 179949 of Ca II H & K emission we reported one year ago. The enhancement coincides with phase = 0 (the sub-planetary point) of the 3.093-day orbit. The most likely explanation is chromospheric heating by magnetic rather than tidal interaction. The four other 51 Peg-type systems we have monitored continue to show significant nightly variations in their H & K emission but the lack of phase duplication does not allow us to confirm whether the activity is synchronised with the planet's orbit. Our two standards, \tau Ceti and the Sun, show no such nightly variation.

The author(s) of this abstract have provided an email address for comments about the abstract: shkolnik@physics.ubc.ca

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.