klaurent – Page 3 – Kavli Institute Pre-Print Publications

A steadily declining dispersion measure for the repeating fast radio burst FRB 20220529A: Evidence for an FRB engine embedded in an expanding supernova remnant

Posted by klaurent February 25, 2026March 4, 2026MIT, This Week: Astrophysics

Kavli Affiliate: Kiyoshi Masui | Summary:We present the discovery and subsequent 3.2 year monitoring campaign of the repeating fast radio burst FRB 20220529A with CHIME/FRB. We observe a gradual dispersion measure (DM) decline of $-0.881pm0.001~mathrmpc~mathrmcm^-3~mathrmyear^-1$ ($-1.235pm0.001~mathrmpc~mathrmcm^-3~mathrmyear^-1$ in the rest frame), implying a $geq3.5pm0.2$% decrease of the total electron column in the source environment, and we […]

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AT2024lhc and AT2024kmq in the landscape of featureless tidal disruption events

Posted by klaurent February 25, 2026March 4, 2026MIT, This Week: Astrophysics

Kavli Affiliate: Dheeraj Pasham | Summary:We study AT2024kmq and AT2024lhc, two tidal disruption events (TDEs) with blue featureless spectra associated with high-mass black holes ($M_rm BHsim 10^8,M_odot$). Both events show optical precursors consistent with shock dissipation from stream self-intersection. Their X-ray emission is luminous ($L_rm Xsim 10^44,rm erg,s^-1$), highly variable (with minimum observed variability timescales […]

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Designing heterostructures to control oxygen stoichiometry in helimagnetic perovskite strontium ferrite

Posted by klaurent February 25, 2026March 4, 2026Cornell, This Week: Nanoscience

Kavli Affiliate: David Muller | Summary:A large challenge in determining the physics of helimagnetic SrFeO3 is in stabilizing the stoichiometric chemical phase over long enough time scales to conduct extensive measurements. Degradation in SrFeO3 manifests mainly as a crossover from metallic to insulating behavior. Using a combination of electronic transport and density functional theory, we […]

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A Path to an All-Sky Survey with Roman

Posted by klaurent February 24, 2026March 4, 2026Stanford, This Week: Astrophysics

Kavli Affiliate: Susan Clark | Summary:A deep, space-based, all-sky near-infrared survey carried out with the Nancy Grace Roman Space Telescope would constitute a foundational astronomical infrastructure for decades to come. In this white paper, we present a concrete and feasible path to imaging the entire sky at $sim0.1”$ resolution, beginning with high-impact fields in Cycle […]

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The DECam MAGIC Survey: Uncovering the Tidal Tails of the Crater II Dwarf Galaxy

Posted by klaurent February 24, 2026March 4, 2026Chicago, This Week: Astrophysics

Kavli Affiliate: Alexander Ji | Summary:Crater II (CraII), a large and low-density dwarf spheroidal galaxy, has unusual observed properties that are difficult to reproduce in cold dark matter simulations. Ongoing tidal disruption may help explain the discrepancies, as evidenced by the recent discovery of tidal tails. Here we present metallicity-sensitive narrowband photometry of the Ca […]

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Low-Energy Radon Backgrounds from Electrode Grids in Dual-Phase Xenon TPCs

Posted by klaurent February 24, 2026March 4, 2026Stanford, This Week: Astrophysics

Kavli Affiliate: C. M. Ignarra | Summary:The dual-phase xenon time projection chamber (TPC) is a powerful technology to detect rare interactions such as scatters of dark matter particles on nuclei. In particular, the built-in gain of ionization signals in a dual-phase TPC makes it sensitive to events in the few-electron regime, as expected from low-mass […]

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Machine Learning on Heterogeneous, Edge, and Quantum Hardware for Particle Physics (ML-HEQUPP)

Posted by klaurent February 24, 2026March 4, 2026Chicago, This Week: Astrophysics

Kavli Affiliate: David W. Miller | Summary:The next generation of particle physics experiments will face a new era of challenges in data acquisition, due to unprecedented data rates and volumes along with extreme environments and operational constraints. Harnessing this data for scientific discovery demands real-time inference and decision-making, intelligent data reduction, and efficient processing architectures […]

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ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 — an Orphan Afterglow or an off-nuclear TDE from an IMBH?

Posted by klaurent February 24, 2026March 4, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Claudio Ricci | Summary:We report the discovery of a slowly evolving, extragalactic radio transient, ASKAP J005512.2–255834 (hereafter ASKAP J0055-2558), identified using the Australian SKA Pathfinder in a search for orphan afterglows associated with archival gravitational wave events. Although discovered in this context, there is no evidence that the transient is associated with any […]

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Time-variable Scattered Light in Herbig Disks Observed with Subaru/SCExAO

Posted by klaurent February 23, 2026March 4, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Ruobing Dong | Summary:Using the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument, we present near-infrared K-band polarimetric imaging of nine Herbig stars selected from a volume-limited sample within 200 pc. We detect the disks around MWC 480, HD 163296, and HD 143006 for the first time with SCExAO, and compare these observations with […]

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Time-variable Scattered Light in Herbig Disks Observed with Subaru/SCExAO

Posted by klaurent February 23, 2026March 4, 2026Peking, This Week: Astrophysics

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