The infrared imaging spectrograph (IRIS) for TMT: sensitivities and simulations

Wright, Shelley A.; Barton, Elizabeth J.; Larkin, James E.; Moore, Anna; Crampton, D.; Simard, Luc; Team, Iris

doi:10.1117/12.856501

Cited by 21 publications

(22 citation statements)

References 18 publications

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“…Using these values, a neutron star at distance d, maximally heated by dark matter kinetic energy (to 0.5 nJy at 2 µm), could be detected at SNR 2 in ∼ 10 5 (d/(10 pc)) 4 seconds. At the TMT, the IRIS instrument [41] has coverage from 0.8 to 2.5 µm. Although it has a larger collecting area than JWST, TMT must contend with the background provided by Earth's atmosphere.…”

mentioning

confidence: 99%

Dark Kinetic Heating of Neutron Stars and an Infrared Window on WIMPs, SIMPs, and Pure Higgsinos

Baryakhtar¹,

Bramante²,

Li³

et al. 2017

Phys. Rev. Lett.

176

219

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We identify a largely model-independent signature of dark matter (DM) interactions with nucleons and electrons. DM in the local galactic halo, gravitationally accelerated to over half the speed of light, scatters against and deposits kinetic energy into neutron stars, heating them to infrared blackbody temperatures. The resulting radiation could potentially be detected by the James Webb Space Telescope, the Thirty Meter Telescope, or the European Extremely Large Telescope. This mechanism also produces optical emission from neutron stars in the galactic bulge, and x-ray emission near the galactic center because dark matter is denser in these regions. For GeV-PeV mass dark matter, dark kinetic heating would initially unmask any spin-independent or spin-dependent dark matter-nucleon cross sections exceeding 2×10^{-45} cm^{2}, with improved sensitivity after more telescope exposure. For lighter-than-GeV dark matter, cross-section sensitivity scales inversely with dark matter mass because of Pauli blocking; for heavier-than-PeV dark matter, it scales linearly with mass as a result of needing multiple scatters for capture. Future observations of dark sector-warmed neutron stars could determine whether dark matter annihilates in or only kinetically heats neutron stars. Because inelastic interstate transitions of up to a few GeV would occur in relativistic scattering against nucleons, elusive inelastic dark matter like pure Higgsinos can also be discovered.

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mentioning

confidence: 99%

Dark Kinetic Heating of Neutron Stars and an Infrared Window on WIMPs, SIMPs, and Pure Higgsinos

Baryakhtar¹,

Bramante²,

Li³

et al. 2017

Phys. Rev. Lett.

176

219

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“…We have developed an extensive data simulator for the IRIS imager which includes the effects of TMT, NFIRAOS, and IRIS optical systems. 13,15 We have included additional effects of ghost images, and simulate 25 iterations of single point source and multiple point-source cases with magnitudes 1-25 in K-band (2 -2.4 µm) wavelengths. For error analysis, we also simulate ideal models that do not include noise and ghost images in the simulation.…”

Section: Ghost Image Simulationsmentioning

confidence: 99%

“…In the IRIS simulator, we assume the following sources of noise in the IRIS imager: readnoise of 5 e − , dark current of 0.002 e − , and Poisson noise from sources, background (telescope, instrument, and atmospheric), and dark current. [11][12][13] We note that systematic error sources are not included in the simulation. Additionally, we use a single PSF per bandpass for these simulations, which does not represent a fair comparison to real observations.…”

Section: Photometric Precisionmentioning

confidence: 99%

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The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric precision and ghost analysis

Nils

Walth

Wright

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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The InfraRed Imaging Spectrograph (IRIS) is a first-light instrument for the Thirty Meter Telescope (TMT) that will be used to sample the corrected adaptive optics field by NFIRAOS with a near-infrared (0.8 -2.4 µm) imaging camera and Integral Field Spectrograph (IFS). In order to understand the science case specifications of the IRIS instrument, we use the IRIS data simulator to characterize photometric precision and accuracy of the IRIS imager. We present the results of investigation into the effects of potential ghosting in the IRIS optical design. Each source in the IRIS imager field of view results in ghost images on the detector from IRIS's wedge filters, entrance window, and Atmospheric Dispersion Corrector (ADC) prism. We incorporated each of these ghosts into the IRIS simulator by simulating an appropriate magnitude point source at a specified pixel distance, and for the case of the extended ghosts redistributing flux evenly over the area specified by IRIS's optical design. We simulate the ghosting impact on the photometric capabilities, and found that ghosts generally contribute negligible effects on the flux counts for point sources except for extreme cases where ghosts coalign with a star of ∆m>2 fainter than the ghost source. Lastly, we explore the photometric precision and accuracy for single sources and crowded field photometry on the IRIS imager.

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“…The IRIS team has developed a full end-to-end data simulator for both the imager and integral field spectrograph. 14,15 The simulator has been used to determine IRIS sensitivities, explore a range of science cases, and help to investigate instrumental requirements. We have previously described the technical details for the simulator and presented direct point source and resolved source sensitivities.…”

Section: Data Simulatormentioning

confidence: 99%

The infrared imaging spectrograph (IRIS) for TMT: latest science cases and simulations

Wright

Walth

et al. 2016

SPIE Proceedings

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The Thirty Meter Telescope (TMT) first light instrument IRIS (Infrared Imaging Spectrograph) will complete its preliminary design phase in 2016. The IRIS instrument design includes a near-infrared (0.85 -2.4 micron) integral field spectrograph (IFS) and imager that are able to conduct simultaneous diffraction-limited observations behind the advanced adaptive optics system NFIRAOS. The IRIS science cases have continued to be developed and new science studies have been investigated to aid in technical performance and design requirements. In this development phase, the IRIS science team has paid particular attention to the selection of filters, gratings, sensitivities of the entire system, and science cases that will benefit from the parallel mode of the IFS and imaging camera. We present new science cases for IRIS using the latest end-to-end data simulator on the following topics: Solar System bodies, the Galactic center, active galactic nuclei (AGN), and distant gravitationally-lensed galaxies. We then briefly discuss the necessity of an advanced data management system and data reduction pipeline.

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The infrared imaging spectrograph (IRIS) for TMT: sensitivities and simulations

Cited by 21 publications

References 18 publications

Dark Kinetic Heating of Neutron Stars and an Infrared Window on WIMPs, SIMPs, and Pure Higgsinos

Dark Kinetic Heating of Neutron Stars and an Infrared Window on WIMPs, SIMPs, and Pure Higgsinos

The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric precision and ghost analysis

The infrared imaging spectrograph (IRIS) for TMT: latest science cases and simulations

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