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

NEID fiber feed and barycentric correction

Not scheduled
Sunstar Hotel, Grindelwald, Switzerland

Sunstar Hotel, Grindelwald, Switzerland

Dorfstrasse 168, 3818 Grindelwald Switzerland
Poster Error budget in EPRV


Mr Shubham Kanodia (Pennsylvania State University)


NEID is a high resolution (R~100,000) fiber - fed Radial Velocity (RV) spectrograph, that will be commissioned at the 3.5 m WIYN telescope at Kitt Peak, USA. In this presentation, I will discuss the details of the NEID fiber feed, which contains octagonal and circular fibers. I shall discuss and share techniques we used to polish these fibers in custom fused silica pucks, FRD, scrambling and performance and testing of sub-sections of the feed.

To achieve the 1 cm/s precision in barycentric correction requires knowing the time of the observation to about 0.3 seconds, and an exposure meter. At this level of precision the flux variability depends on wavelength. I will discuss the design, integration and testing of NEID’s chromatic exposure meter (R ~ 100), which will potentially enable barycentric correction separately for each of NEID’s 118 spectral orders. I shall also discuss the design, testing and installation of the exposure meter. Finally, I shall talk about Barycorrpy, the Python implementation of Barycorr (Wright and Eastman 2014) which is now in use in the pipelines of HPF, CARMENES, and NEID.

Primary authors

Mr Shubham Kanodia (Pennsylvania State University) Prof. Suvrath Mahadevan (Penn State University) Dr NEID team

Presentation Materials

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