PSR J2222−0137

PSR J2222−0137 is a nearby intermediate-mass binary pulsar at a distance of 267+1.2
−0.9 pc (approximately 870 light-years),[1] whose low-mass neutron star's companion is a white dwarf (PSR J2222−0137 B). The white dwarf has a relatively large mass of 1.319 ± 0.004 M☉[2] and a temperature less than 3,000 K,[1] meaning it is likely crystallized, leading to this Earth-sized white dwarf being described as a "diamond-star".[3]

References
  1. Kaplan, David L.; Boyles, Jason; Dunlap, Bart H.; Tendulkar, Shriharsh P.; Deller, Adam T.; Ransom, Scott M.; McLaughlin, Maura A.; Lorimer, Duncan R.; Stairs, Ingrid H. (2014). "A 1.05M☉Companion to PSR J2222–0137: The Coolest Known White Dwarf?". The Astrophysical Journal. 789 (2): 119. arXiv:1406.0488v1. Bibcode:2014ApJ...789..119K. doi:10.1088/0004-637X/789/2/119. ISSN 0004-637X. S2CID 19986066.
  2. Guo, Y. J.; Freire, P. C. C.; Guillemot, L.; Kramer, M.; Zhu, W. W.; Wex, N.; McKee, J. W.; Deller, A.; Ding, H.; Kaplan, D. L.; Stappers, B.; Cognard, I.; Miao, X.; Haase, L.; Keith, M.; Ransom, S. M.; Theureau, G. (2021). "PSR J2222−0137. I. Improved physical parameters for the system". Astronomy & Astrophysics. 654: A16. arXiv:2107.09474. Bibcode:2021A&A...654A..16G. doi:10.1051/0004-6361/202141450. S2CID 236134389.
  3. Drake, Nadia (24 June 2014). "Astronomers Find Slow-Cooked Diamond the Size of Earth". National Geographic.
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