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Roadmap of GHOST@Gemini's Precision Radial Velocity Mode
Venu M. Kalari, Andreas Seifahrt, Ruben Diaz
GHOST is a newly operational optical fiber-fed high-resolution spectrograph at the Gemini South 8.1m telescope. It currently offers the choice of two resolution modes captured by o…
MAROON-X: The first two years of EPRVs from Gemini North
Andreas Seifahrt, Jacob L. Bean, David Kasper +11
MAROON-X is a fiber-fed, optical EPRV spectrograph at the 8-m Gemini North Telescope on Mauna Kea, Hawai'i. MAROON-X was commissioned as a visiting instrument in December 2019 and…
On-sky commissioning of MAROON-X: A new precision radial velocity spectrograph for Gemini North
A. Seifahrt, J. L. Bean, J. Stürmer +10
MAROON-X is a fiber-fed, red-optical, high precision radial velocity spectrograph recently commissioned at the Gemini North telescope on Mauna Kea, Hawai'i. With a resolving power…
Rubidium transitions as wavelength reference for astronomical Doppler spectrographs
Dmytro Rogozin, Tobias Feger, Christian Schwab +10
Precise wavelength calibration is a critical issue for high-resolution spectroscopic observations. The ideal calibration source should be able to provide a very stable and dense gr…
MAROON-X: A Radial Velocity Spectrograph for the Gemini Observatory
Andreas Seifahrt, Julian Stürmer, Jacob L. Bean +1
MAROON-X is a red-optical, high precision radial velocity spectrograph currently nearing completion and undergoing extensive performance testing at the University of Chicago. The i…
Optimal non-circular fiber geometries for image scrambling in high-resolution spectrographs
Julian Stürmer, Christian Schwab, Stephan Grimm +6
Optical fibers are a key component for high-resolution spectrographs to attain high precision in radial velocity measurements. We present a custom fiber with a novel core geometry…
Characterizing octagonal and rectangular fibers for MAROON-X
Adam P. Sutherland, Julian Stürmer, Katrina R. Miller +2
We report on the scrambling performance and focal-ratio-degradation (FRD) of various octagonal and rectangular fibers considered for MAROON-X. Our measurements demonstrate the detr…
Rubidium-traced white-light etalon calibrator for radial velocity measurements at the cm/s level
Julian Stürmer, Andreas Seifahrt, Christian Schwab +1
We report on the construction and testing of a vacuum-gap Fabry-Pérot etalon calibrator for high precision radial velocity spectrographs. Our etalon is traced against a rubidium fr…
Development and construction of MAROON-X
Andreas Seifahrt, Jacob L. Bean, Julian Stürmer +4
We report on the development and construction of a new fiber-fed, red-optical, high-precision radial-velocity spectrograph for one of the twin 6.5m Magellan Telescopes in Chile. MA…
A microlens-array based pupil slicer and double scrambler for MAROON-X
Andreas Seifahrt, Julian Stürmer, Jacob L. Bean
We report on the design and construction of a microlens-array (MLA)-based pupil slicer and double scrambler for MAROON-X, a new fiber-fed, red-optical, high-precision radial-veloci…
Exposure Time Calculator for Immersion Grating Infrared Spectrograph: IGRINS
Huynh Anh N. Le, Soojong Pak, Daniel T. Jaffe +4
We present an exposure-time calculator (ETC) for the Immersion Grating Infrared Spectrograph (IGRINS). The signal and noise values are calculated by taking into account the telluri…
Correcting METIS spectra for telluric absorption to maximize spectral fidelity
Stefan Uttenthaler, Klaus M. Pontoppidan, Andreas Seifahrt +10
METIS is a mid-infrared instrument proposed for the European Extremely Large Telescope (E-ELT). It is designed to provide imaging and spectroscopic capabilities in the 3 - 14 micro…
Synthesising, using, and correcting for telluric features in high-resolution astronomical spectra
A. Seifahrt, H. U. Käufl, G. Zängl +3
We present a technique to synthesise telluric absorption and emission features both for in-situ wavelength calibration and for their removal from astronomical spectra. While the pr…