Fringing analysis and forward modeling of Keck Planet Imager and Characterizer (KPIC) spectra

Katelyn A. Horstman; Jean-Baptiste Ruffio; Jason J. Wang; Chih-Chun Hsu; Ashley Baker; Luke Finnerty; Jerry Xuan; Daniel Echeverri; Dimitri Mawet; Geoffrey A. Blake; Randall Bartos; Charlotte Z. Bond; Benjamin Calvin; Sylvain Cetre; Jacques-Robert Delorme; Greg Doppmann; Michael P. Fitzgerald; Nemanja J. Jovanovic; Ronald Lopez; Emily C. Martin; Evan Morris; Jacklyn Pezzato; Garreth Ruane; Ben Sappey; Tobias Schofield; Andrew Skemer; Taylor Venenciano; J. Kent Wallace; Ji Wang; Peter Wizinowich

doi:10.1117/12.3018020

18 July 2024 Fringing analysis and forward modeling of Keck Planet Imager and Characterizer (KPIC) spectra

Katelyn A. Horstman, Jean-Baptiste Ruffio, Jason J. Wang, Chih-Chun Hsu, Ashley Baker, Luke Finnerty, Jerry Xuan, Daniel Echeverri, Dimitri Mawet, Geoffrey A. Blake, Randall Bartos, Charlotte Z. Bond, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Michael P. Fitzgerald, Nemanja J. Jovanovic, Ronald Lopez, Emily C. Martin, Evan Morris, Jacklyn Pezzato, Garreth Ruane, Ben Sappey, Tobias Schofield, Andrew Skemer, Taylor Venenciano, J. Kent Wallace, Ji Wang, Peter Wizinowich

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130962E (2024) https://doi.org/10.1117/12.3018020
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Keck Planet Imager and Characterizer (KPIC) combines high contrast imaging with high resolution spectroscopy (R∼35,000 in K band) to study directly imaged exoplanets and brown dwarfs in unprecedented detail. KPIC aims to spectrally characterize substellar companions through measurements of planetary radial velocities, spins, and atmospheric composition. Currently, the dominant source of systematic noise for KPIC is fringing, or oscillations in the spectrum as a function of wavelength. The fringing signal can dominate residuals by up to 10% of the continuum for high S/N exposures, preventing accurate wavelength calibration, retrieval of atmospheric parameters, and detection of planets with flux ratios less than 1% of the host star. To combat contamination from fringing, we first identify its three unique sources and adopt a physically informed model of Fabry-Pérot cavities to apply to post-processed data. We find this strategy can effectively model the fringing in observations of bright stars, reducing the residual systematics caused by fringing by a factor of 2. Next, we wedge two of the transmissive optics internal to KPIC to eliminate two sources of fringing and confirm the third source as the entrance window to the spectrograph. Finally, we apply our previous model of the Fabry-Pérot cavity to new data taken with the wedged optics to reduce the amplitude of the residuals by a factor of 10.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Katelyn A. Horstman, Jean-Baptiste Ruffio, Jason J. Wang, Chih-Chun Hsu, Ashley Baker, Luke Finnerty, Jerry Xuan, Daniel Echeverri, Dimitri Mawet, Geoffrey A. Blake, Randall Bartos, Charlotte Z. Bond, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Michael P. Fitzgerald, Nemanja J. Jovanovic, Ronald Lopez, Emily C. Martin, Evan Morris, Jacklyn Pezzato, Garreth Ruane, Ben Sappey, Tobias Schofield, Andrew Skemer, Taylor Venenciano, J. Kent Wallace, Ji Wang, and Peter Wizinowich "Fringing analysis and forward modeling of Keck Planet Imager and Characterizer (KPIC) spectra", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130962E (18 July 2024); https://doi.org/10.1117/12.3018020

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