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  • 21 Aug, 2019

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GP Comae Berenices
GP Comae Berenices, abbreviated to GP Com and also known as G 61-29, is a star system composed of a white dwarf orbited by a planetary mass object, likely the highly eroded core of another white dwarf star. The white dwarf is slowly accreting material from its satellite at a rate of (3.5±0.5)×10 M☉/year and was proven to be a low-activity AM CVn star. The star system is showing signs of a high abundance of ionized nitrogen from the accretion disk around the primary.

Planetary system

The material emitted from the planetary mass companion is mostly helium, with a molar ratio of nitrogen up to 1.7%, very low neon levels and other elements not detectable at all. Approximately half of the luminosity of the system comes from the accretion disk. The planetary object is suspected to contain a strange quark matter core due to its unusually high density, which must be above 187.5 g/cm to prevent tidal disruption; the theoretical bound for planets composed solely of ordinary matter is on the order of 30 g/cm. The object's orbit is expected to decay within 100 million years due to gravitational wave emission.

The GP Com planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(seconds) 		Eccentricity Inclination Radius
b 10.5±1.5 MJ 0.0014 2794 0 59.5±14.5° ≤ 0.420±0.020 RJ

References

  1. ^ Smak, J. (January 1975). "The helium emission-line object G 61-29". Acta Astronomica. 25: 227–233. Bibcode:1975AcA....25..227S. Retrieved 12 December 2021.
  2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. ^ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  4. ^ Burbidge, E. M.; Strittmatter, P. A. (1971), "G61 - 29, a Helium Emission-Line Star", The Astrophysical Journal, 170: L39, Bibcode:1971ApJ...170L..39B, doi:10.1086/180836
  5. ^ Sion, Edward M.; Linnell, Albert P.; Godon, Patrick; Ballouz, Ronald-Louis (2011), "THE HOT COMPONENTS OF AM CVN HELIUM CATACLYSMICS", The Astrophysical Journal, 741 (1): 63, arXiv:1108.1388, Bibcode:2011ApJ...741...63S, doi:10.1088/0004-637X/741/1/63, S2CID 119284962
  6. ^ "G 61-29". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-09.
  7. ^ Zhang, Xian-Fei; Liu, Jin-Zhong; Jeffery, C. Simon; Hall, Philip D.; Bi, Shao-Lan (2018), "The double helium-white dwarf channel for the formation of AM CVN binaries", Research in Astronomy and Astrophysics, 18 (1): 009, arXiv:1801.03196, Bibcode:2018RAA....18....9Z, doi:10.1088/1674-4527/18/1/9, S2CID 73586281
  8. ^ Morales-Rueda, L.; Marsh, T. R.; Steeghs, D.; Unda-Sanzana, E.; Wood, J. H.; North, R. C. (2003), "New results on GP Com", Astronomy & Astrophysics, 405: 249–261, arXiv:astro-ph/0304265, Bibcode:2003A&A...405..249M, doi:10.1051/0004-6361:20030552, S2CID 119033361
  9. ^ Kupfer, T.; Steeghs, D.; Groot, P. J.; Marsh, T. R.; Nelemans, G.; Roelofs, G. H. A. (2016), "UVES and X-Shooter spectroscopy of the emission line AM CVN systems GP Com and V396 Hya", Monthly Notices of the Royal Astronomical Society, 457 (2): 1828, arXiv:1601.02841, Bibcode:2016MNRAS.457.1828K, doi:10.1093/mnras/stw126
  10. ^ Nelemans, G.; Yungelson, L. R.; Sluys, M. V. van der; Tout, Christopher A. (2009), "The chemical composition of donors in AM CVN stars and ultracompact X-ray binaries: Observational tests of their formation", Monthly Notices of the Royal Astronomical Society, 401 (2): 1347–1359, arXiv:0909.3376, doi:10.1111/j.1365-2966.2009.15731.x, S2CID 2716902
  11. ^ Kuerban, Abudushataer; Geng, Jin-Jun; Huang, Yong-Feng; Zong, Hong-Shi; Gong, Hang (2020), "Close-in Exoplanets as Candidates for Strange Quark Matter Objects", The Astrophysical Journal, 890 (1): 41, arXiv:1908.11191, Bibcode:2020ApJ...890...41K, doi:10.3847/1538-4357/ab698b, S2CID 201671383
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