Kavli Affiliate: Kiyoshi Masui | Summary:Population studies of fast radio burst (FRB) repetition typically model sources using a single distribution of steady, time-averaged burst rates, yet individual sources show significant departures from this assumption. Here we present FRB 20210601A, a source discovered by the Canadian Hydrogen Intensity Mapping Experiment FRB project (CHIME/FRB) that represents the […]

Kavli Affiliate: Mark Vogelsberger | Summary:The ionizing radiation that galaxies release into their surroundings depends on whether efficient Lyman continuum (LyC) escape coincides with strong photon production. Stellar feedback can open escape paths as the source population fades, linking the escaping radiation to a galaxy’s recent history. We investigate this timing in thirteen high-redshift (z […]

Kavli Affiliate: Lina Necib | Summary:The interpretation and reach of direct detection (DD) experiments depend sensitively on the local dark matter (DM) velocity distribution, particularly its high-velocity tail. This tail is crucial for elastic scattering at low DM masses or large momentum transfers, and for inelastic upscattering, where additional kinetic energy is needed to overcome […]

Kavli Affiliate: Avi Shporer | Summary:Hot Jupiters are typically thought to be "lonely", but a small and growing subset of them have been found to have nearby planets in the same system. We present the discovery of a new member of this class of systems, TOI-3686. TOI-3686 c is a hot Jupiter with $P_mathrmorb = […]

Kavli Affiliate: Saul Rappaport | Summary:The discovery of exoplanets around white dwarfs uniquely informs our understanding of planetary survival through stellar evolution. Common Envelope (CE) evolution is one of the proposed mechanisms that could shape the orbital architecture of these planets around stellar remnants. In this work, we predict the occurrence rate and orbital separation/planet […]

Kavli Affiliate: Sara Seager | Summary:Granulation is a persistent feature of stars with outer convective layers and is the photospheric signature of near-surface convective energy transport. In disk-integrated observations, it produces stochastic brightness variations that contribute substantially to stellar variability on timescales of minutes to hours. High-precision, observations with JWST provide an opportunity to study […]

Kavli Affiliate: Andrew Vanderburg | Summary:We present a homogeneous analysis of 268 confirmed and candidate transiting hot-Jupiter host stars with 4800K < Teff < 6200K. We combine high-resolution TRES spectra, Gaia, 2MASS and WISE photometry, and Gaia astrometry to determine these stars’ Teff, log g, Rstar, [alpha/Fe] and [Fe/H]. Based on their [alpha/Fe] and [Fe/H], […]

Kavli Affiliate: Jacqueline Hewitt | Summary:Mutual coupling between elements of low-frequency arrays is a leading systematic for 21 cm cosmology, leaking bright foregrounds into otherwise clean regions of the power spectrum. Many mitigation models describe coupling as a linear combination of uncoupled signals re-radiated from neighboring feeds, but data suggest additional mechanisms. Inspired by antenna […]

Kavli Affiliate: Mark Vogelsberger | Summary:Off-nuclear tidal disruption events (TDEs) reveal evidence for massive black holes outside galactic centers, but the origins of this wandering population remain uncertain. We investigate wandering intermediate-mass black holes (IMBHs) formed through runaway stellar collisions in dense, high-redshift star clusters and predict their TDE signatures across cosmic time. Our semi-analytic […]

Kavli Affiliate: Salvatore Vitale | Summary:While the spin vectors of binary black holes offer insight into the astrophysical formation channels of these systems, individual spins are less precisely measured through gravitational-wave observations than the effective inspiral spin $χ_mathrmeff$ and the effective precession spin $χ_mathrmp$. Reducing to effective parameters discards information in the data, but how […]