Radial Velocity Studies and their Limits: A Case Study of BP Psc
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Radial velocity studies have provided the majority of all exoplanet
discoveries. Using the radial velocity techniques on young stars suffers
from problems with magnetic activity jitter, which has been studied for
years, and the effects of circumstellar disks, which has remained
unstudied. Here we study the disk-embedded star BP Psc using high
resolution, high accuracy HARPS spectra. We derive radial velocities,
activity indices, and line profile information. We find that the
presence of a disk severely limits information about the star. We find
that even the line profiles are distorted by the disk reprocessing of
the stellar light and we conclude that the disk of BP Psc is highly
inhomogenious.