This Week: Astrophysics – Kavli Institute Pre-Print Publications

Overview of the Canadian Hydrogen Observatory and Radio Transient Detector (CHORD) Project

Posted by klaurent July 10, 2026July 13, 2026MIT, This Week: Astrophysics

Kavli Affiliate: Kiyoshi Masui | Summary:The Canadian Hydrogen Observatory and Radio-transient Detector (CHORD) is a next-generation wideband radio interferometer currently being constructed and commissioned at the Dominion Radio Astrophysical Observatory in British Columbia, Canada. CHORD is designed for precision 21,cm cosmology, fast radio transient discovery, spectral line galaxy surveys, and pulsar science using a highly […]

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Constraints on Sub-MeV Dark Matter from Solar Reflection with DAMIC-M

Posted by klaurent July 10, 2026July 13, 2026Chicago, This Week: Astrophysics

Kavli Affiliate: Paolo Privitera | Summary:The Sun acts as a natural dark matter accelerator. Galactic halo particles scattering in the solar plasma emerge with velocities well beyond the Galactic escape speed, providing a boosted flux that extends the kinematic reach of direct detection experiments into the sub-MeV mass regime. We present constraints on solar-reflected dark […]

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Minimal Majoron Dark Matter from a Discrete $Z_N$ Gauge Symmetry

Posted by klaurent July 10, 2026July 13, 2026This Week: Astrophysics, Tokyo

Kavli Affiliate: Shigeki Matsumoto | Summary:We investigate majoron dark matter in a minimal setup, where the Standard Model is extended by three right-handed neutrinos and a complex scalar field. The theory is defined by an exact discrete gauge symmetry, $Z_Nsubset U(1)_B-L$, while the global $U(1)_B-L$ symmetry emerges only as an accidental symmetry at low energies. […]

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Chromatic Effects Across the Roman Focal Plane: Implications for Supernova Photometry and Measurements of Cosmological Parameters

Posted by klaurent July 9, 2026July 13, 2026Chicago, This Week: Astrophysics

Kavli Affiliate: Richard Kessler | Summary:Calibration uncertainties are the leading systematics in cosmological analyses using Type Ia supernovae (SNe Ia). For the textitNancy Grace Roman Space Telescope (Roman), we quantify the impact of chromatic effects on SNe Ia photometry and derived cosmological parameters, using simulated light curves from the High-Latitude Time Domain Survey. We investigate […]

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The Thesan-Zoom project: bursty star formation is incompatible with prolonged dust survival

Posted by klaurent July 9, 2026July 13, 2026MIT, This Week: Astrophysics

Kavli Affiliate: Mark Vogelsberger | Summary:Cosmic dust is a key regulator of galaxy evolution, but its build-up and survival in the first billion years remain poorly constrained. We present a systematic analysis of dust in the thesan-zoom suite of radiation-hydrodynamical zoom-in simulations, which self-consistently model dust formation, growth, destruction, and its coupling to radiative transfer […]

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What becomes of JWST/NIRCam-selected high-redshift massive galaxies?

Posted by klaurent July 9, 2026July 13, 2026MIT, This Week: Astrophysics

Kavli Affiliate: Mark Vogelsberger | Summary:Early JWST/NIRCam surveys revealed a puzzling population of high-redshift massive galaxy candidates largely absent from previous rest-frame UV surveys. Spectroscopic follow-up has both confirmed and contested these candidates, whose potential overabundance may challenge traditional models of galaxy formation. In this study we evaluate the reliability of the photometric selections used […]

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QSCOUT’s Qubit-Boson Gate Set

Posted by klaurent July 9, 2026July 13, 2026Stanford, This Week: Astrophysics

Kavli Affiliate: Susan Clark | Summary:The Quantum Scientific Computing Open User Testbed (QSCOUT) has developed a qubit-boson gate set for hybrid continuous-discrete variable (CV-DV) quantum computing. This document outlines how to utilize these gates on QSCOUT using Just Another Quantum Assembly Language, JaqaltextsuperscriptTM. | Search Query: arXiv Query: search_query=au:”Clark Susan”&id_list=&start=0&max_results=10Read More

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HETDEX [OII] galaxies at $z le 0.48$: Volume-limited samples and their power spectra

Posted by klaurent July 9, 2026July 13, 2026This Week: Astrophysics, Tokyo

Kavli Affiliate: Eiichiro Komatsu | Summary:The catalog from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Public Data Release 1 (PDR1) contains half a million emission-line-selected [OII] galaxies spread across $540~mathrmdeg^2$ at $z le 0.48$ from HETDEX’s unprecedented untargeted spectroscopic survey. In this paper, we construct volume-limited samples from PDR1 in three luminosity bins across the […]

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Subaru meets JWST: A Direct Measurement of Ly$boldsymbolα$ Escape Fraction at $boldsymbolzsimeq6.2$ with Dual Narrow-Band Imaging

Posted by klaurent July 9, 2026July 13, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Kohei Inayoshi | Summary:We present a direct measurement of the Ly$α$ escape fraction, $f^rm Lyα_rm esc$, for H$α$ emitters (HAEs) at $zsimeq6.2$ in the JWST CEERS field by combining JWST/NIRCam F470N imaging with Subaru/HSC NB872 imaging. This unique pair of narrow-band filters enables the simultaneous measurement of Ly$α$ and H$α$ fluxes from galaxies […]

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Boötes III is a Tidally Disrupting Ultra-Faint Dwarf Galaxy on an Eccentric Polar Orbit

Posted by klaurent July 8, 2026July 13, 2026Chicago, This Week: Astrophysics

Kavli Affiliate: Alexander Ji | Summary:We present updated systemic properties of the ultra-faint dwarf galaxy Boötes III from the Southern Stellar Stream Spectroscopic Survey (S$^5$). We identify 21 high-probability members and measure a velocity dispersion of $σ_v = 1.69^+1.03_-0.85$ km s$^-1$, about six times smaller than the previously reported $10.7 pm 3.5$ km s$^-1$, and […]

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