Kavli Affiliate: Bruce Macintosh | Summary:Observations of debris disks provide a valuable window to investigate the formation and evolution of planetary systems. We present high-contrast JWST/NIRCam observations of CPD-72 2713, a 24 Myr-old star that belongs to the $β$ Pic moving group. We obtained the first scattered-light images of the disk in both F210M and […]
Kavli Affiliate: Luis Ho | Summary:How galaxies stop forming stars is a complex and central problem in astrophysics. Numerous physical mechanisms have been proposed, yet a simple, unified framework connecting these mechanisms remains lacking. Here, we derive a step-function quenching response from the fundamental principle of gas mass conservation, governed by the competition between gas-supply […]
Kavli Affiliate: Feng Long| Summary: China’s next-generation large telescopes, such as the Expandable Aperture Segmented Telescope (EAST) and the Large Optical/Infrared Telescope (LOT), are being planned as flagship facilities for high-angular-resolution astronomy, including the direct imaging and characterization of exoplanetary systems (e.g., exoplanets, circumstellar disks). However, their segmented, centrally obscured apertures present significant challenges for […]
Kavli Affiliate: Ronald Hanson | Summary:A suite of tunable diode laser absorption spectroscopy (TDLAS) diagnostics targeting rovibrational states of nitric oxide (NO) in the mid-infrared (MIR) and electronic states of atomic oxygen (O) and nitrogen (N) in the near-IR (NIR) was combined with optical emission spectroscopy (OES) for overlapping wavelengths at the NASA Electric Arc […]
Kavli Affiliate: Linhua Jiang | Summary:The role of the large-scale environment in regulating AGN activity remains an open question. We investigate the Mpc-scale environments of 70 AGNs at $z=1.1$-$1.5$ using a highly complete sample of 3,419 Pa$α$ emitters with accurate spectroscopic redshifts from JWST slitless spectroscopic survey. This dataset allows us to robustly trace the […]
Kavli Affiliate: Linhua Jiang | Summary:Molecular hydrogen (H$_2$) is the fundamental component of the molecular gas reservoir that fuels star formation and black hole growth. While prominent hot H$_2$ emission ($gtrsim 1000$ K) has been explored in nearby galaxies, its excitation mechanisms at higher redshifts remain poorly constrained. We present a systematic study of hot […]
Kavli Affiliate: Linhua Jiang | Summary:We combine wide-area COSMOS-3D observations with deeper GOODS-N data from JWST/NIRCam F444W wide-field slitless spectroscopy to trace cosmic star formation over $zsim0$–9. The observations cover approximately $0.33~mathrmdeg^2$ in COSMOS and $60.9~mathrmarcmin^2$ in GOODS-N, with typical $3σ$ integrated line-flux limits of $3.2times10^-18$ and $1.04times10^-18~mathrmerg,s^-1,cm^-2$, respectively. The common $3.9$–$5.0,μ$m wavelength window probes […]
Kavli Affiliate: Anton Akhmerov | Summary:Beenakker’s formula, $U(varphi)-U(0)=Δsum_nbigl(1-sqrt1-τ_nsin^2(varphi/2)bigr)$, expresses the zero-temperature energy-phase relation of a short Josephson junction through its normal-state transmission eigenvalues. We generalize this transmission representation beyond the short-junction limit and express the phase-dependent free energy of a time-reversal-symmetric $s$-wave junction as a Matsubara sum over channels with frequency-dependent transmissions. The representation constrains […]
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 […]