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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 o ....

United States , Sloan Digital Sky , Chicago Hubble Program , Astronomical Society Of The Pacific , Astronomical Data Analysis Software , Mb Church , Carnegie Chicago Hubble , Los Alamos Supernova Light Curve Project , Conference Series , Astronomical Society , Sloan Digital Sky Survey , Extragalactic Areas , Lensing Science , Space Sci ,

A 12.4-day periodicity in a close binary system after a supernova

Neutron stars and stellar-mass black holes are the remnants of massive star explosions1. Most massive stars reside in close binary systems2, and the interplay between the companion star and the newly formed compact object has been theoretically explored3, but signatures for binarity or evidence for the formation of a compact object during a supernova explosion are still lacking. Here we report a stripped-envelope supernova, SN 2022jli, which shows 12.4-day periodic undulations during the declining light curve. Narrow Hα emission is detected in late-time spectra with concordant periodic velocity shifts, probably arising from hydrogen gas stripped from a companion and accreted onto the compact remnant. A new Fermi-LAT γ-ray source is temporally and positionally consistent with SN 2022jli. The observed properties of SN 2022jli, including periodic undulations in the optical light curve, coherent Hα emission shifting and evidence for association with a γ-ray source, poin ....

Nordrhein Westfalen , Az Arbayjane Sharqi , United States , Portegies Zwart , Freitas Pacheco , Sloan Digital Sky , Sexten Center , Optical Survey , Zwicky Transient Facility Phase , Astronomical Data Analysis Software , Leiden Argentine Bonn , Nuclear Spectroscopic Telescope Array Nustarx Ray , Keck Infrared Transient Survey , Society Of Photo , X Photometric Survey Telescope , Intermediate Palomar Transient , Discovery Report , Name Server Discovery Report , Early Data Release , Zwicky Transient Facility , Hubble Space Telescope Key Project , Wilkinson Microwave Anisotropy Probe , Hubble Space Telescope , Apache Point Observatory Catalog , Optical Diffuse Interstellar , Open Source Softw ,

Create your own sky map, find the weirdest stars and explore the surface of the Moon with the EXPLORE astronomy toolkit

Strasbourg, France (SPX) Dec 14, 2023 -
A new set of tools for astronomers and planetary explorers use interactive visual analytics and machine learning to reveal and contrast properties of objects in our galaxy. From identifying the wei ....

Manuela Rauch , Nick Cox , Giacomo Nodjoumi , Astronomical Data Analysis Software , Italian Space Agency , Constructor University , European Commission Horizon , European Space Agency Gaia , Milky Way , European Commission , European Space Agency , Know Center , Space News ,

Astronomy toolkit allows users to create their own sky map, find the weirdest stars and explore the surface of the moon

Astronomy toolkit allows users to create their own sky map, find the weirdest stars and explore the surface of the moon
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Manuela Rauch , Nick Cox , Giacomo Nodjoumi , Constructor University , European Commission Horizon , Italian Space Agency , European Space Agency Gaia , Astronomical Data Analysis Software Systems , Consortium Terriajs Smithsonian , Milky Way , European Commission , Astronomical Data Analysis Software , European Space Agency , Know Center ,

Minutes-duration optical flares with supernova luminosities

In recent years, certain luminous extragalactic optical transients have been observed to last only a few days1. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae), whose timescale is weeks2. Some short-duration transients, most notably AT2018cow (ref. 3), show blue optical colours and bright radio and X-ray emission4. Several AT2018cow-like transients have shown hints of a long-lived embedded energy source5, such as X-ray variability6,7, prolonged ultraviolet emission8, a tentative X-ray quasiperiodic oscillation9,10 and large energies coupled to fast (but subrelativistic) radio-emitting ejecta11,12. Here we report observations of minutes-duration optical flares in the aftermath of an AT2018cow-like transient, AT2022tsd (the ‘Tasmanian Devil’). The flares occur over a period of months, are highly energetic and are probably nonthermal, implying that they arise from a near-relativistic ....

South Korea , United States , United Kingdom , Ch Ungch Ong Bukto , Ugarte Postigo , Rivera Sandoval , International Astronomical Union , Astrophysics Source Code Library , Gildas Team , Ms High Energy Astrophysics Cambridge Univ , Thai National Telescope , Zwicky Transient Facility Bright , Spectroscopic Survey Of Transient Objects , Sloan Digital Sky , Astronomical Society Of The Pacific , Astronomical Data Analysis Software , Galactic Center , Large Array Survey Telescope , Dark Energy , Line Data Analysis Software , Discovery Report , Name Server Discovery Report , Automatic Learning , Rapid Classification , Name Server Astronote , Black Hole ,