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The most complete portrait of a supernova ever

The most complete portrait of a supernova ever
phys.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from phys.org Daily Mail and Mail on Sunday newspapers.

Erez Zimmerman , Ido Irani , Avishay Gal , Weizmann Institute Of Science Liverpool Telescope , Weizmann Institute Of Science , Baltimore Space Telescope Science Institute , Liverpool Telescope , Weizmann Institute , Keck Observatory , Milky Way , Avishay Gal Yam , Space Telescope , Space Telescope Science Institute , Keck Cosmic Web Imager , Deep Imaging , Multi Object Spectrograph , Low Resolution Imaging Spectrometer ,

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 ,

A rotating white dwarf shows different compositions on its opposite faces

White dwarfs, the extremely dense remnants left behind by most stars after their death, are characterized by a mass comparable to that of the Sun compressed into the size of an Earth-like planet. In the resulting strong gravity, heavy elements sink towards the centre and the upper layer of the atmosphere contains only the lightest element present, usually hydrogen or helium1,2. Several mechanisms compete with gravitational settling to change a white dwarf’s surface composition as it cools3, and the fraction of white dwarfs with helium atmospheres is known to increase by a factor of about 2.5 below a temperature of about 30,000 kelvin4–8; therefore, some white dwarfs that appear to have hydrogen-dominated atmospheres above 30,000 kelvin are bound to transition to be helium-dominated as they cool below it. Here we report observations of ZTF J203349.8+322901.1, a transitioning white dwarf with two faces: one side of its atmosphere is dominated by hydrogen and ....

United Kingdom , Douglas Gough , Gran Telescopio Canarias , Gentile Fusillo , Holland Publishing Co , Astronomical Society Of The Pacific Conference Series , Sloan Digital Sky Survey Data , Sloan Digital Sky , American Institute Of Physics Conference Series Vol , Palomar Green , Second Conference , Faint Blue Stars , Zwicky Transient Facility , Gran Telescopio , Keck Low Resolution Imaging , European Workshop , White Dwarfs , Astronomical Society , Pacific Conference Series , Montreal White Dwarf Database , European White Dwarf Workshop , Gaia Data Release , Low Resolution Imaging Spectrometer , Early Data Release , Sloan Digital Sky Survey Data Release , Stellar Astrophysics ,

Hawaii astronomers say this burned-out star is 'two-faced.' (It's not an insult)

Hawaii astronomers say this burned-out star is 'two-faced.' (It's not an insult)
hawaiinewsnow.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from hawaiinewsnow.com Daily Mail and Mail on Sunday newspapers.

San Diego , United States , Ilaria Caiazzo , Keck Observatory , Mauna Kea , Low Resolution Imaging Spectrometer , Kecki Telescope , Near Infared Echelletee Spectrograph ,

Two-Faced Star Exposed: Unusual White Dwarf Star Is Made Of Hydrogen On One Side And Helium On The Other

Two-Faced Star Exposed: Unusual White Dwarf Star Is Made Of Hydrogen On One Side And Helium On The Other
spaceref.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from spaceref.com Daily Mail and Mail on Sunday newspapers.

United States , California Institute Of Technology , San Diego , Caltech Palomar , Gran Telescopio Canarias , Ilaria Caiazzo , James Fuller , Judy Cohen , Verac Rubin , Keith Matthews , Tom Soifer , University Of California , Cuba Astronomical Foundation , National Aeronautics , Space Administration , Wm Keck Foundation , Zwicky Transient Facility , Palomar Observatory , Keck Observatory , Low Resolution Imaging Spectrometer , Kecki Telescope , Near Infrared Echellette Spectrograph , California Institute , Bev Oke , Nobel Prize , Chief Instrument Scientist Keith Matthews ,