ESA – Pale blue (supernova) dot

This NASA/ESA Hubble Area Telescope Image of the Week options the galaxy LEDA 22057, which is situated about 650 million light-years away within the constellation Gemini. Like the topic of final week’s Image of the Week, LEDA 22057 is the location of a supernova explosion. This explicit supernova, named SN 2024PI, was found by an automatic survey in January 2024. The survey covers your entire northern half of the night time sky each two days and has catalogued greater than 10 000 supernovae.

The supernova is seen on this picture: situated simply down and to the precise of the galactic nucleus, the pale blue dot of SN 2024PI stands out towards the galaxy’s ghostly spiral arms. This picture was taken a couple of month and a half after the supernova was found, so the supernova is seen right here many occasions fainter than its most brilliance.

SN 2024PI is assessed as a Sort Ia supernova. The sort of supernova requires a outstanding object known as a white dwarf, the crystallised core of a star with a mass lower than about eight occasions the mass of the Solar. When a star of this measurement makes use of up the provision of hydrogen in its core, it balloons right into a pink large, changing into cool, puffy and luminous. Over time, pulsations and stellar winds trigger the star to shed its outer layers, abandoning a white dwarf and a vibrant planetary nebula. White dwarfs can have floor temperatures greater than 100 000 levels and are extraordinarily dense, packing roughly the mass of the Solar right into a sphere the scale of Earth. 

Whereas practically all the stars within the Milky Manner will in the future evolve into white dwarfs — that is the destiny that awaits the Solar some 5 billion years sooner or later — not all of them will explode as Sort Ia supernovae. For that to occur, the white dwarf should be a member of a binary star system. When a white dwarf syphons materials from a stellar associate, the white dwarf can turn out to be too large to help itself. The ensuing burst of runaway nuclear fusion destroys the white dwarf in a supernova explosion that may be seen many galaxies away.

[Image Description: A spiral galaxy with two thin, slowly-curving arms, one fainter than the other, coming off the tips of a bright, oval-shaped core region. The disc of the galaxy is also oval-shaped and filled with fuzzy dust under the arms. It has some bright spots where stars are concentrated, especially along the arms. The core has a white glow in the centre and thick bands of gas around it. A supernova is visible as a pale blue dot near the core.]