Kavli Affiliate: Erin Kara | Summary:The supermassive binary system, $η$ Carinae, is experiencing enormous wind-driven mass loss at a rate unparalleled in the rest of the Galaxy. Their wind-wind collision (WWC) continuously produces shock heated, X-ray emitting plasmas. The XRISM X-ray observatory observed the system in 2023 and 2024 when the X-ray emission began to […]

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 […]

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 […]

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 […]