17-21 March 2019
Sunstar Hotel, Grindelwald, Switzerland
Europe/Zurich timezone

Error sources for the Automated Planet Finder

Not scheduled
Sunstar Hotel, Grindelwald, Switzerland

Sunstar Hotel, Grindelwald, Switzerland

Dorfstrasse 168, 3818 Grindelwald Switzerland
Poster Error budget in EPRV


Bradford Holden (University of California Observatories)


We have analyzed four years of Automated Planet Finder (APF) data to understand the error sources in the measured radial velocities. Our approach combines two data sets, long term measurements on a few standard stars and an intense campaign observing simultaneously observing two stars with both the APF and the PFS on Magellan. We find that, despite the strong similarities between the APF's Levy spectrometer and the PFS, the PFS performs markedly better with a 5 minute intrinsic uncertainty of ~60 cm/s as opposed to the Levy's ~150 cm/s. This error source is likely from the star moving on the aperture and we detail our planned improvements to upgrade the spectrometer. We also find hints of a seasonal zero point shift in the Levy's performance, related to temperature control system of the instrument.

Primary authors

Bradford Holden (University of California Observatories) Jennifer Burt (MIT)

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