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Stripped-envelope supernova light curves argue for central engine activity

The luminosity of stripped-envelope supernovae, a common type of stellar explosion, is believed to be mainly driven by the radioactive decay of the nickel synthesized in the explosion and carried in its ejecta. Additional possible energy sources have been previously suggested1–5, in which the two most observationally based results have been from a comparison of the observed time-weighted luminosity with the inferred radioactive power1 and from a comparison of the light curves with particular theoretical models3. However, the former result1 was not statistically significant, and the latter3 is highly dependent on the specific models assumed. Here we analyse the energy budget of a sample of 54 well-observed stripped-envelope supernovae of all sub-types and present statistically significant, largely model-independent, observational evidence for a non-radioactive power source in most of them (and possibly in all). We consider various energy sources, or alternatively, plausible systematic errors, that could drive this result, and conclude that the most likely option is the existence of a long-lived central engine, operating over ≈103–106 s after the explosion. We infer, from the observations, constraints on the engine properties. If, for example, the central engine is a magnetized neutron star, then the initial magnetic field is ≈1015 G and the initial rotation period is 1–100 ms, suggesting that stripped-envelope supernovae may constitute the formation events of the objects known as magnetars. Analysis of the energy budget of a sample of 54 well-observed stripped-envelope supernovae of all sub-types shows statistically significant, largely model-independent, observational evidence for a non-radioactive power source in most of them.

Van-dyk , Zwicky-transient-facility-bright , Sloan-digital-sky , Properties-of-the-progenitor-stars , Lick-observatory-supernova-search , Sloan-digital-sky-survey , K-sample-anderson , Systematic-study , Mid-infrared-emission , Core-collapse-supernovae , Carnegie-supernova-project , Stellar-astrophysics

Hubble Snaps Stunning Image of Small Spiral Galaxy

Hubble Snaps Stunning Image of Small Spiral Galaxy
sci.news - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sci.news Daily Mail and Mail on Sunday newspapers.

Sweden , Uppsala , Uppsala-lan , La-silla , Valparaí , Chile , Hubblec-kilpatrick , Sloan-digital-sky-survey , Field-infrared-survey-explorer , Space-telescope , European-southern-observatory

Westminster Planetarium show will explore supermassive black holes

The Westminster College Planetarium will present “Cosmic Mashup” at 6 p.m. Wednesday and May 3 in Hoyt Science Center.

New-mexico , United-states , Matteo-luisi , Sloan-digital-sky-survey , Hoyt-science-center , Westminster-college-planetarium , Hoyt-science , Milky-way , Fiske-planetarium ,

Westminster Planetarium show will explore supermassive black holes \ Westminster College

The Westminster College Planetarium will present “Cosmic Mashup” at 6 p.m., Wednesday, April 24, and Friday, May 3, in Hoyt Science Center.

New-mexico , United-states , Matteo-luisi , Westminster-college-planetarium , Sloan-digital-sky-survey , Hoyt-science-center , Hoyt-science , Milky-way , Fiske-planetarium , Westminster-planetarium-show-will-explore-supermassive-black-holes-college ,

Largest 3D map of our universe could 'turn cosmology upside down'

Scientists using the Dark Energy Spectroscopic Instrument have unveiled the largest 3D map of the universe ever. The results suggest that dark energy, the mysterious force pulling the universe apart, may be weakening, challenging prevailing theories of cosmology.

Arizona , United-states , Spain , Kitt-peak-national-observatory , Kyle-dawson , Nicholasu-mayall , Dillon-brout , Institute-for-high-energy-physics , Boston-university , Sloan-digital-sky , University-of-utah , Dark-energy-spectroscopic-instrument

EPFL Researchers unveil the largest 3D map of the universe ever made

EPFL Researchers unveil the largest 3D map of the universe ever made
sciencebusiness.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sciencebusiness.net Daily Mail and Mail on Sunday newspapers.

Switzerland , United-states , Jiaxi-yu , Mohamed-bouri , Michael-levi , Jean-paul-kneib , Daniel-forero-sanchez , Denis-gillet , Dark-energy-spectroscopic-instrument , Sloan-digital-sky-survey , Laboratory-of-astrophysics , Kitt-peak-national-observatory

Winds from supermassive black holes can stunt dwarf galaxy growth

New research showed strong winds blowing from supermassive black holes curtails stellar formation inside the dwarf galaxies where they reside.

Hawaii , United-states , California , Christina-manzano-king , Gabriela-canalizo , Sloan-digital-sky , University-of-california , Milky-way , Astrophysical-journal , Sloan-digital-sky-survey , Science ,

New Map of the Universe Challenges What We Know About Dark Energy

New Map of the Universe Challenges What We Know About Dark Energy
extremetech.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from extremetech.com Daily Mail and Mail on Sunday newspapers.

Arizona , United-states , California , Carlos-frenk , Arizona-dark-energy-spectroscopic-instrument , California-lawrence-berkeley-national-laboratory , Sloan-digital-sky-survey , Dark-energy-spectroscopic-instrument , Lawrence-berkeley-national-laboratory , Big-bang ,

Researchers Unveil Largest 3D Map Of Universe Ever Made

Researchers Unveil Largest 3D Map Of Universe Ever Made
miragenews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from miragenews.com Daily Mail and Mail on Sunday newspapers.

Switzerland , United-states , Mohamed-bouri , Denis-gillet , Michael-levi , Daniel-forero-sanchez , Iolkam-duag-kitt , Jean-paul-kneib , Jiaxi-yu , Dark-energy-spectroscopic-instrument , Sloan-digital-sky-survey , Kitt-peak-national-observatory

First results from DESI make the most precise measurement of our expanding universe

First results from DESI make the most precise measurement of our expanding universe
sciencedaily.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sciencedaily.com Daily Mail and Mail on Sunday newspapers.

Spain , Italy , France , Berkeley , California , United-states , United-kingdom , Mexico , French , American , Verac-rubin , Hee-jong-seo