Ghosts of NEID’s past

Shubham Kanodia; Joe P. Ninan; Andrew J. Monson; Suvrath Mahadevan; Colin Nitroy; Christian Schwab; Samuel Halverson; Chad F. Bender; Ryan Terrien; Frederick R. Hearty; Emily Lubar; Michael W. McElwain; Lawrence W. Ramsey; Paul M. Robertson; Arpita Roy; Gudmundur Stefansson; Daniel J. Stevens

doi:10.1117/12.2561679

13 December 2020 Ghosts of NEID’s past

Shubham Kanodia, Joe P. Ninan, Andrew J. Monson, Suvrath Mahadevan, Colin Nitroy, Christian Schwab, Samuel Halverson, Chad F. Bender, Ryan Terrien, Frederick R. Hearty, Emily Lubar, Michael W. McElwain, Lawrence W. Ramsey, Paul M. Robertson, Arpita Roy, Gudmundur Stefansson, Daniel J. Stevens

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144740 (2020) https://doi.org/10.1117/12.2561679
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The NEID spectrograph is a R ~ 120,000 resolution fiber-fed and highly stabilized spectrograph for extreme radial velocity (RV) precision. It is being commissioned at the 3.5 m WIYN telescope in Kitt Peak National Observatory with a desired instrumental precision of better than 30 cm s⁻¹. NEID’s bandpass of 380 – 930 nm enables the simultaneous wavelength coverage of activity indicators from the Ca HK lines in the blue to the Ca IR triplet in the IR. In this paper we will present our efforts to characterize and mitigate optical ghosts in the NEID spectrograph during assembly, integration and testing, and highlight several of the dominant optical element contributors such as the cross dispersion prism and input optics. We shall present simulations of the 2-D spectrum and discuss the predicted ghost features on the focal plane, and how they may impact the RV performance for NEID. We also present the mitigation strategy adopted for each ghost which may be applied to future instrument designs. This work will enable other instrument builders to potentially avoid some of these issues, as well as outline mitigation strategies.

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Shubham Kanodia, Joe P. Ninan, Andrew J. Monson, Suvrath Mahadevan, Colin Nitroy, Christian Schwab, Samuel Halverson, Chad F. Bender, Ryan Terrien, Frederick R. Hearty, Emily Lubar, Michael W. McElwain, Lawrence W. Ramsey, Paul M. Robertson, Arpita Roy, Gudmundur Stefansson, and Daniel J. Stevens "Ghosts of NEID’s past", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144740 (13 December 2020); https://doi.org/10.1117/12.2561679

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