A analysis group led by Dr. Zhang Jujia from Yunnan Observatories of the Chinese language Academy of Sciences and Prof. Wang Xiaofeng from Tsinghua College has revealed the stellar mass violently ejected from a progenitor on the finish of its life by observing the once-in-a-decade supernova SN 2023ixf. Such mass loss processes can present important data for understanding the ultimate evolution of a large star.
The study was revealed in Science Bulletin on Sept. 14.
Kind II supernovae (SNe II) are the most typical stellar explosions within the universe, for which the ultimate stage of evolution of their hydrogen-rich huge progenitors in the direction of core-collapse explosion is elusive. The ultimate stage evolution and the resultant circumstellar environments have led to a wealthy range of such explosions.
To determine a hyperlink between the explosion of SNe II and the late-time evolution of huge stars, it’s essential to seize the first-light alerts of the SN explosions, i.e., the flashed spectra, as a result of ionization of the circumstellar materials (CSM)/stellar wind by ultraviolet/high energy photons from shock breakout cooling.
The latest explosion of SN 2023ixf in a really close by galaxy, Messier 101, gives a uncommon alternative to deal with this long-standing challenge. Well timed, high-cadence flash spectra taken inside one to 5 days of the explosion permit researchers to position stringent constraints on the properties of the encompassing circumstellar materials surrounding this supernova.
It’s estimated that the progenitor of SN 2023ixf misplaced materials at a mass-loss charge of 6 × 10-4 M⊙ yr-1 over the last two to a few years earlier than the explosion. The close by materials, shifting at a velocity of 55 km s-1, collected a compact CSM shell inside a radius of lower than 7 × 1014 cm from the progenitor.
Contemplating the excessive mass-loss charge and comparatively excessive wind velocity, along with the pre-explosion observations made about twenty years in the past, the progenitor of SN 2023ixf may very well be a short-lived yellow hypergiant that advanced from a pink supergiant shortly earlier than the explosion.
“The statement and investigation of SN 2023ixf is ongoing. A collection of works on this SN will make it a milestone within the historical past of SNe II and can then assist to disclose the destiny of huge stars within the mass vary from 10 to twenty M⊙,” stated Dr. Zhang.
Extra data:
Jujia Zhang et al, Circumstellar materials ejected violently by a large star instantly earlier than its loss of life, Science Bulletin (2023). DOI: 10.1016/j.scib.2023.09.015
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Chinese Academy of Sciences
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Examine reveals violent materials ejection strategy of a dying huge star (2023, October 16)
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