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1
2
3
planet
star
light curve
1
2
3
Time
Fig. 11.1
The model of transit of extrasolar planet (From Kepler Internet)
may reveal the effect of other perturbing planets in the exoplanet systems (Steffen
and Agol
2005
) or moons of the transiting exoplanet (Szabo Gy et al.
2006
;Simon
et al.
2007
; Kipping
2009a
,
b
).
Ca
II
H&K lines are classical diagnostic and indicators of chromospheric activity
and became a classical activity diagnostic. Star-planet in stellar chromospheres
could produce the enhanced Ca
II
H&K flux following the periodicity of the
planet orbiting its host star. If modulation of chromospheric emission has a period
comparable to that of the planet's orbital, then it is likely that the planet is
stimulating the activity through some tidal and magnetic mechanism (Shkolnik et al.
2008
). Recently, Shkolnik et al. (
2003
,
2005
,
2008
) reported on planet-induced
chromospheric activities on several stars, such as HD 179949, apparent from the
night to night modulation of the Ca
II
H&K chromospheric emission phase with
the hot Jupiter's orbit (Fig.
11.2
). It is a convincing case of planetary-induced
modulation (Shkolnik et al.
2003
). The chromospheric rotational modulation will
offer further physical constraints on the interaction between the extrasolar planet
and its host star.
11.2
Telescope and Plans
On the one hand, we plan to monitor the extrasolar Planets using an 85-cm telescope
(Zhou et al.
2009
) and 60-cm telescope at Xinglong Station of the National Astro-
nomical Observatories of China (NAOC). The photometer of the 85-cm telescope
was equipped with a 1024*1024 pixel CCD and the standard Johnson-Cousin-
Bessell BVRcIc filters (Zhou et al.
2009
). Our follow-up photometric objects are
taken from the SuperWASP project: WASP-4b, WASP-36b ::: (Pollacco et al.
2006
; Christian et al.
2006
), HATNet project: HAT-P-10b/WASP-11b, HAT-P-19b,
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