This thesis presents accurate analyses of the spin-orbit angle
for many remarkable transiting exoplanetary systems, including the
first measurement of the Rossiter-McLaughlin effect for a multiple
transiting system.
The author presents the observational methods needed to probe
the spin-orbit angle, the relation between the stellar spin axis
and planetary orbital axis. Measurements of the spin-orbit angle
provide us a unique and valuable opportunity to understand the
origin of close-in giant exoplanets, called "hot Jupiters."
The first method introduced involves observations of the
Rossiter-McLaughlin effect (RM effect). The author points out the
issues with the previous theoretical modeling of the RM effect and
derives a new and improved theory. Applications of the new theory
to observational data are also presented for a number of remarkable
systems, and the author shows that the new theory minimizes the
systematic errors by applying it to the observational data.
The author also describes another method for constraining the
spin-orbit angle: by combining the measurements of stellar flux
variations due to dark spots on the stellar surface, with the
projected stellar rotational velocity measured via spectroscopy,
the spin-orbit angles "along the line-of-sight" are constrained for
the transiting exoplanetary systems reported by the Kepler space
telescope."
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