IRAS 00500+6713

IRAS 00500+6713 is a new type of star announced in December 2020 and created by the explosive merger of two ultra-dense white dwarfs.[1] It consists of a super-hot central star, a super-Chandrasekhar object with a mass ≳1.5 M⊙ called J005311, surrounded by a nebula packed with hot gas and warm dust.[2] The star represents a new kind of X-ray source.[3] It exhibits record-breaking wind speeds[4] and large amounts of neon, magnesium, silicon, and sulfur.[1]

IRAS 00500+6713

Co-orbiting white dwarfs
Credit: NASA/Tod Strohmayer (GSFC)/Dana Berry (Chandra X-Ray Observatory)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 0h 53m 11.5s
Declination +67° 30′ 10″

It has been linked to the supernova SN 1181.

The star is highly unstable, too massive to remain as a white dwarf, and it is predicted to collapse into a neutron star within ten thousand years.[5]

References
  1. Oskinova, Lidia M.; Gvaramadze, Vasilii V.; Gräfener, Götz; Langer, Norbert; Todt, Helge (2020-12-01). "X-rays observations of a super-Chandrasekhar object reveal an ONe and a CO white dwarf merger product embedded in a putative SN Iax remnant". Astronomy & Astrophysics. 644: L8. arXiv:2008.10612. Bibcode:2020A&A...644L...8O. doi:10.1051/0004-6361/202039232. ISSN 0004-6361. S2CID 221293111.
  2. "This 'Unusual Star' Is Unlike Anything Astronomers Have Seen Before". Gizmodo. Retrieved 2021-01-23.
  3. Agency, European Space (2021-01-11). "Cosmic Neon Lights: Strange New Type of Star Revealed in X-ray Light". SciTechDaily. Retrieved 2021-01-23.
  4. "Strange star unlike any seen before, scientists say". Room, The Space Journal. Retrieved 2021-01-23.
  5. "Brilliant X-rays reveal what might be a new type of star". Nature. 589 (7841): 172. 2021. Bibcode:2021Natur.589S.172.. doi:10.1038/d41586-020-03654-x.


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