Prof. Jennifer L. Hoffman Profile

Prof. Jennifer L. Hoffman

at Univ. of Denver

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Proceedings Article | 18 July 2024 Poster + Paper

The future of polarimetry at the NOIRLab Gemini North Observatory facility

Mark Rawlings, Rubén Díaz, Jennifer Hoffman, John White, Matt Rippa, Felix Krämer, Darren DePoy, Dmitry Monin, John Pazder, Garima Singh, Teo Mocnik

Proceedings Volume 13096, 1309636 (2024) https://doi.org/10.1117/12.3019428

KEYWORDS: Gemini Observatory, Polarimetry, Equipment, Gemini Planet Imager, Telescopes, Wave plates, Observatories, Calibration, Wavefront sensors

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Polarimetric observations can provide important information on many astrophysical phenomena beyond that available via conventional imaging and spectroscopy alone. As a first step toward providing Gemini North instrument support for polarimetric observations, an instrument upgrade program is currently under way to bring one of the GPOL polarization modulator units (GPOL-N) into operation in concert with NIRI at Gemini North (GN) to provide an IR imaging polarimetry in the visiting instrument mode. Featuring three deployable trays that accommodate swappable, rotatable polarizing waveplates and calibration polarizers, GPOL is designed to facilitate polarimetric observations over the opticalinfrared wavelength range of 0.3 – 5 μm. When installed on the telescope, GPOL is physically situated inside the Acquisition and Guidance (A&G) unit, and is designed to work in concert with bottom port instruments containing an oninstrument Wollaston prism, such as NIRI. We present here an overview of the functional characteristics of GPOL and the current status of the GPOL+NIRI commissioning project. Following control board and software updates, the GPOL-N unit is currently undergoing further testing as a prelude to refurbishment. We also briefly discuss subsequent Gemini North polarimetric instrumentation plans, which include the possible future commissioning of a visitor mode that combines GPOL with the GNIRS multifunction spectrograph to provide NIR spectropolarimetry, and polarimetric imaging via the GPI 2.0 instrument.

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