Radial Velocity Studies and their Limits: A Case Study of BP Psc

Scritto in Pubblicazioni

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...

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RRPictoris: an old nova showing superhumps and QPOs

Scritto in Pubblicazioni

We present time-resolved V photometry of the old nova RRPictoris (RRPic). Apart from the hump-like variability, the light curves show the strong flickering and random variation typical for RRPic. We do not find any convincing evidence for the previously reported eclipse. The extrapolated eclipse phase coincides with a broad minimum, but comparing the overall shape of the light curve suggests that the eclipse should actually be located around phase 0.2. The orbital period which we derive from these data agrees well with the old one, any uncertainty is too small to account for the...

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2003 MC7

Scritto in Pubblicazioni

Available from the Minor Planet Center.
Available from the Minor Planet Center.