The Infrared Imaging Spectrograph (IRIS) for TMT: instrument overview

Larkin, James E.; Wright, Shelley A.; Chisholm, Eric; Andersen, David R.; Dekany, Richard; Dunn, Jennifer; Hayano, Yutaka; Kupke, Renate; Smith, Roger M.; Suzuki, Ryuji; Weber, Robert; Zhang, Kai

doi:10.1117/12.2561184

Cited by 12 publications

(1 citation statement)

References 6 publications

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“…The telescope-born distortions are characterized by low-order terms; the warm MAORY optics have larger distortions (with respect to the ELT) but higher optomechanical stability, whereas the cold MICADO optics have even higher distortions due to the magnifying optics, but extreme stability. For instruments such as MICADO 14 and IRIS, 15 the common figure of merit for the relative astrometry at single-and multi-epoch observations is 50 μas in the near-infrared (NIR) for sources ∼1 as apart. The origin and fundamental limits of achieving 50 μas-level astrometry with the ELT/MICADO was discussed by Pott et al 16 Generally, NIR refers to a wavelength range of 0.8 to 2.4 μm where typically higher AO performances (and boosted astrometry) are achieved at the red side of this range (H-K band).…”

Section: Introductionmentioning

confidence: 99%

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Rodeghiero

Arcidiacono

Pott

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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Multi-conjugated adaptive optics (MCAO) is essential for performing astrometry with the Extremely Large Telescope (ELT). Unlike most of the 8-m class telescopes, the ELT will be a fully adaptive telescope, and a significant portion of the adaptive optics (AO) dynamic range will be depleted by the correction and stabilization of the telescope aberrations and instabilities. MCAO systems are of particular interest for ground-based astrometry since they stabilize the low-order field distortions and transient plate scale instabilities, which originate from the telescope and in the instrument. All instruments have several optical elements relatively far away from the pupil that can potentially challenge the astrometric precision of the observations with their residual mid-spatial frequencies errors. Using a combined simulation of ray tracing and AO numerical codes, we assess the impact of these systematic errors at different field-ofview (FoV) scales and fitting scenarios. The distortions have been assessed at different sky position angles (PA) and indicate that over large FoVs only small PA ranges (AE1 deg to 3 deg) are accessible with astrometric residuals ≤50 μas. A full compliance with the astrometric requirement, at any PA, is achievable for 2 arc sec 2 FoV patches already with a third-order polynomial. The natural partition of the optical system into three segments, i.e., the ELT, the MAORY MCAO module, and the MICADO instrument, resembles a splitting of the astrometric problem into the three subsystems that are characterized by different distortion amplitudes and calibration strategies. The result is a family portrait of the different optical segments with their specifications, dynamic motions, conjugation height, and AO correctability, leading to tracing their role in the bigger puzzle of the 50-μas as astrometric endeavor. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Introductionmentioning

confidence: 99%

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Rodeghiero

Arcidiacono

Pott

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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India-TMT project—science instrumentation program

et al. 2022

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Hubble parameter estimation via dark sirens with the LISA-Taiji network

Wang

Ruan

Yang

et al. 2021

National Science Review

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The Hubble parameter is one of the central parameters in modern cosmology, which describes the present expansion rate of the universe. Their values inferred from the late-time observations are systematically higher than those from the early-time measurements by about $10\%$. To come to a robust conclusion, independent probes with accuracy at percent levels are crucial. Gravitational waves from compact binary coalescence events can be formulated into the standard siren approach to provide an independent Hubble parameter measurement. The future space-borne gravitational wave observatory network, such as the LISA-Taiji network, will be able to measure the gravitational wave signals in the Millihertz bands with unprecedented accuracy. By including several statistical and instrumental noises, we show that within 5 years operation time, the LISA-Taiji network is able to constrain the Hubble parameter within $1\%$ accuracy, and possibly beats the scatters down to $0.5\%$ or even better.

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The Infrared Imaging Spectrograph (IRIS) for TMT: instrument overview

Cited by 12 publications

References 6 publications

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Performance and limitations of using ELT and MCAO for 50 μas astrometry

India-TMT project—science instrumentation program

Hubble parameter estimation via dark sirens with the LISA-Taiji network

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