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 […]
Kavli Affiliate: Scott A. Hughes | Summary:Extreme mass ratio inspirals (EMRIs) are expected to be a major source of gravitational waves (GWs) for the future it Laser Interferometer Space Antenna (it LISA). An EMRI occurs when a compact object, driven by the emission of gravitational radiation, slowly inspirals into a massive black hole (MBH). The […]
Kavli Affiliate: Mark Vogelsberger | Summary:Merging galaxy clusters provide an ideal laboratory for testing the self-interacting nature of dark matter. In this paper, we present a pilot study of magnetohydrodynamical cosmological zoom-in simulations of two cluster mergers selected from TNG-Cluster, with $M_rm 200c sim 9times10^14~M_odot$ and $M_rm 200csim 2times10^14~M_odot$. The simulations are performed with both […]
Kavli Affiliate: Mark Vogelsberger | Summary:We present a unified theory-to-simulation framework for self-interacting dark matter (SIDM), combining a self-contained introduction to its particle-physics foundations and representative benchmark models with an explicit, systematic mapping to simulation inputs and validated numerical implementations in the moving-mesh code AREPO-2. We characterize representative elementary and composite dark-sector models through their […]
Kavli Affiliate: George Clark | Summary:The properties and origins of Jupiter’s UV main auroral emission are, at present, not yet fully understood, particularly the extent to which its two distinct zones, the Zone-I and Zone-II aurora, originate from a common source. In this work, remote-sensing and in-situ data from the Juno spacecraft are used to […]
Kavli Affiliate: Anna Frebel | Summary:We present a detailed chemo-dynamical analysis of the chemically peculiar very metal-poor ([Fe/H]$=-2.22pm 0.11$) Milky Way (MW) halo star, 2MASS J00101758$-$1735387 (hereafter J0010-1735), discovered by the $R$-Process Alliance. We derive abundances for 45 elements, including 28 neutron-capture elements, and confirm that thestar is highly $r$-process-enhanced, with [Eu/Fe]=$+1.30$. The light, $α$, […]
Kavli Affiliate: Erin Kara | Summary:Quasi-periodic eruptions (QPEs) are repeating X-ray transients from galactic nuclei potentially caused by a stellar-mass orbiter repeatedly colliding with the accretion disk of a supermassive black hole (SMBH) in an extreme mass-ratio inspiral (EMRI). In this picture, the eruption arrival times encode the orbit and its relativistic precessions, while the […]