Betelgeuse in radial velocity and photometry

Since more than a decade, we are monitoring Betelgeuse with our robotic spectroscopic facility STELLA/SES in Teide observatory, Tenerife along with its automated photoelectric telescope T7 in Fairborn observatory, Az. Additionally, we were awarded with exclusive two-band photometric data on Betelgeuse from the BRITE satellite consortium, covering the last seven seasons.

In this talk I want to show that the recent dimming event falls together with a re-strengthening of two main excitation periods around 420d and 320d, visible in both, rv data as well as photometric data. These two periods are not prominently visible in the entire data set, but appeared 4-5 years ago, then almost fade for an entire year and reappear in even greater strength 2 years ago.