Higher-Mach-number self-similar shock solutions in failed supernovae are unstable and strengthen asymptotically above a critical neutrino mass-loss threshold, explaining greater ejection in red supergiants versus compact progenitors.
AT2024wpp: An Extremely Luminous Fast Ultraviolet Transient Powered by Accretion onto a Black Hole
5 Pith papers cite this work. Polarity classification is still indexing.
5
Pith papers citing it
abstract
We present the discovery of AT 2024wpp ("Whippet"), a fast and luminous 18cow-like transient. At a redshift of z=0.0868, revealed by Keck Cosmic Web Imager spectroscopy of its faint star-forming host, it is the fourth-nearest example of its class to date. Rapid identification of the source in the Zwicky Transient Facility data stream permitted ultraviolet-through-optical observations to be obtained prior to peak, allowing the first determination of the peak bolometric luminosity (2x10^45 erg/s), maximum photospheric radius (10^15 cm), and total radiated energy (10^51 erg) of an 18cow-like object. We present results from a comprehensive multiwavelength observing campaign, including a far-UV spectrum from the Cosmic Origins Spectrograph on the Hubble Space Telescope and deep imaging extending >100 days post-explosion from the Very Large Telescope, Hubble Space Telescope, Very Large Array, and Atacama Large Millimetre Array. We interpret the observations under a model in which a rapidly-accreting central engine blows a fast (~0.2c) wind into the surrounding medium and irradiates it with X-rays. The high Doppler velocities and intense ionization within this wind prevent identifiable spectroscopic features from appearing in the ejecta or in the surrounding circumstellar material. Weak H and He signatures do emerge in the spectra after 35 days in the form of double-peaked narrow lines. Each peak is individually narrow (full width ~3000 km/s) but the two components are separated by ~6600 km/s, indicating stable structures of denser material, possibly representing streams of tidal ejecta or an ablated companion star.
fields
astro-ph.HE 5years
2026 5representative citing papers
First blind optical identification of a z=0.153 sub-luminous GRB afterglow with Ic-BL SN, yielding a volumetric rate consistent with on-axis high-luminosity long GRBs.
A synchrotron forward-shock model with confined broken-power-law CSM explains FBOT radio diversity via shock transition out of the dense shell, yielding trans-relativistic velocities of 0.1-0.5c and high but brief mass-loss rates of 10^{-4} to 10^{-3} solar masses per year.
Adiabatic winds into ρ∝r^{-n} (0≤n≤2) reach interaction similarity within a few dynamical times and stay valid until reverse-to-forward shell overdensity is order unity, then (for n<2) converge to R_s∝t^{3/(5-n)}.
TESS and ZTF observations of 12 LFBOTs yield no late-time flares after SSO attribution, constraining central engine lifetimes to hundreds of days or less.
citing papers explorer
-
On the Origin of Mass Ejection in Failed Supernovae
Higher-Mach-number self-similar shock solutions in failed supernovae are unstable and strengthen asymptotically above a critical neutrino mass-loss threshold, explaining greater ejection in red supergiants versus compact progenitors.
-
Early Multiwavelength Observations of AT 2026fgk: The Luminous Afterglow to Sub-luminous GRB 260310A, Identified Independently of a Gamma-ray Trigger
First blind optical identification of a z=0.153 sub-luminous GRB afterglow with Ic-BL SN, yielding a volumetric rate consistent with on-axis high-luminosity long GRBs.
-
Radio Emission from Fast Blue Optical Transients Powered by Trans-relativistic Shocks in Confined Circumstellar Material
A synchrotron forward-shock model with confined broken-power-law CSM explains FBOT radio diversity via shock transition out of the dense shell, yielding trans-relativistic velocities of 0.1-0.5c and high but brief mass-loss rates of 10^{-4} to 10^{-3} solar masses per year.
-
The interaction phase of engine-driven explosions and high-energy winds
Adiabatic winds into ρ∝r^{-n} (0≤n≤2) reach interaction similarity within a few dynamical times and stay valid until reverse-to-forward shell overdensity is order unity, then (for n<2) converge to R_s∝t^{3/(5-n)}.
-
Constraints on Late-Time Flaring from Luminous Fast Blue Optical Transients using the Transiting Exoplanet Survey Satellite and the Zwicky Transient Facility
TESS and ZTF observations of 12 LFBOTs yield no late-time flares after SSO attribution, constraining central engine lifetimes to hundreds of days or less.