Kavli Affiliate: Bruce Macintosh | Summary:We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc. HIP 17453 A was observed with high-resolution adaptive optics imaging using the Near-Infrared Camera 2 on the Keck II telescope as part of the […]
Kavli Affiliate: Kevin Reil | Summary:Time-domain and multimessenger astronomy (MMA/TDA) targets demand rapid-response follow-up observations. In many cases, it is the only way to make discoveries and advance our understanding of the astrophysical phenomena, for example, kilonovae accompanying gravitational waves from compact object mergers, shock breakout in supernovae, prompt emission from GRBs, etc. Presently the […]
Kavli Affiliate: Susan Clark | Summary:Atomic hydrogen (HI) is the dominant baryonic component of the interstellar medium (ISM) in Milky Way-like galaxies and the reservoir from which molecular clouds and stars ultimately form. The condensation of diffuse HI into cold structures is governed by a complex interplay between radiative cooling, turbulence, magnetic fields, stellar feedback, […]
Kavli Affiliate: Susan Clark | Summary:Zeeman splitting in spectral lines — both in emission and absorption — provides direct estimates of magnetic field strength and direction in magnetized gas in our own Milky Way and in external galaxies. We discuss the potential for using the Square Kilometre Array (SKA) to measure the Zeeman effect in […]
Kavli Affiliate: Laura Schaefer | Summary:Earth and Venus represent two evolutionary outcomes arising from initially molten ‘magma ocean’ periods, followed by lifetimes of chemical and geophysical divergence. Their physics is common to all rocky planets and is accessible to simulations that adopt coupled interior-atmosphere modelling approaches. Our understanding of planet histories and interpretation of current […]
Kavli Affiliate: Bruce Macintosh | Summary:We report the discovery of $β$ Pictoris d ($β$ Pic d), a third giant planet in the $β$ Pictoris system, which now becomes only the second directly imaged system with more than two confirmed planets. $β$ Pic d was serendipitously detected in JWST/NIRSpec IFU observations. A second epoch of NIRSpec […]
Kavli Affiliate: Maria Monzani | Summary:In this article we describe Cohort Organized Learning (CoOL), a method for clustering data without explicit distance or similarity computations. Herein, we will describe CoOL, derive the gradients determined by expectation maximization to train the networks, show how to monitor convergence during training and evaluate the clusters after training, and […]
Kavli Affiliate: Roger Romani | Summary:We present the first X-ray polarization measurements of the PSR/PWN complex within SNR Kes 75. Two $rm sim,500,ks$ IXPE observations were conducted in October/November 2024 and April 2025. The second observation yields a significant phase-average 2-8 keV polarization degree $rm PD = 9.9% pm 2.5%$ at $rm PA=36.8^circ pm 7.3^circ$, […]
Kavli Affiliate: Susan Clark | Summary:Highly-localized light-matter interactions are necessary for scaling trapped-ion architectures. In hyperfine qubits, counterpropagating beams generate entangling gates by coupling with motion, but this effect is undesirable during single-qubit operations. For that reason, single-qubit gates are traditionally implemented with copropagating beams, and the coexistence of two beam geometries adds hardware and […]
Kavli Affiliate: Laura Schaefer | Summary:Sub-Neptunes’ molten interiors are expected to accommodate large quantities of volatiles, potentially altering their radius evolution. Previous studies have examined this effect in isolation with simplified evolution modeling, often assuming idealized interior and atmospheric conditions. To address this limitation, we introduce SEAMIST, a unified evolution model for sub-Neptunes and super-Earths […]