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A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst

Observationally, kilonovae are astrophysical transients powered by the radioactive decay of nuclei heavier than iron, thought to be synthesized in the merger of two compact objects1–4. Over the first few days, the kilonova evolution is dominated by a large number of radioactive isotopes contributing to the heating rate2,5. On timescales of weeks to months, its behaviour is predicted to differ depending on the ejecta composition and the merger remnant6–8. Previous work has shown that the kilonova associated with gamma-ray burst 230307A is similar to kilonova AT2017gfo (ref. 9), and mid-infrared spectra revealed an emission line at 2.15 micrometres that was attributed to tellurium. Here we report a multi-wavelength analysis, including publicly available James Webb Space Telescope data9 and our own Hubble Space Telescope data, for the same gamma-ray burst. We model its evolution up to two months after the burst and show that, at these late times, the recession of the photospheric radius and the rapidly decaying bolometric luminosity (Lbol ∝ t−2.7±0.4, where t is time) support the recombination of lanthanide-rich ejecta as they cool. A modelling analysis shows that an unusually long gamma-ray burst gave rise to a lanthanide-rich kilonova following the merger of a neutron star–neutron star or of a neutron star–black hole.

⚡ The James Webb Space Telescope Accidentally Discovers a Galaxy That Should Not Exist

The discovery of a dwarf galaxy, named PEARLSDG, by a team of astronomers led by Tim Carleton from Arizona State University, challenges our understanding of galaxy evolution....

Team of astronomers discovers galaxy that shouldn't exist

James Webb Space Telescope snaps pic of weird galaxies

Researchers have used a "gravitational lens" to reveal distant galaxies. The snapshot could help astronomers better understand dark matter.

'Cosmic lens' reveals distant galaxies and helps astronomers better understand dark matter

A new image of the massive El Gordo galaxy cluster, taken by NASA's James Webb Space Telescope, shows 62 distorted galaxies behind the cluster.

Webb Focuses on North Ecliptic Pole

Glimpses of Distant Galaxies Revealed

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