An absence of ex-companion stars in the type Ia supernova remnant SNR 0509−67.5

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A type Ia supernova is thought to begin with the explosion of a white dwarf star1. The explosion could be triggered by the merger of two white dwarfs2, 3 (a ‘double-degenerate’ origin), or by mass transfer from a companion star4, 5 (the ‘single-degenerate’ path). The identity of the progenitor is still controversial; for example, a recent argument against the single-degenerate origin6 has been widely rejected7, 8, 9, 10, 11. One way to distinguish between the double- and single-degenerate progenitors is to look at the centre of a known type Ia supernova remnant to see whether any former companion star is present12, 13. A likely ex-companion star for the progenitor of the supernova observed by Tycho Brahe has been identified14, but that claim is still controversial15, 16, 17, 18. Here we report that the central region of the supernova remnant SNR 0509−67.5 (the site of a type Ia supernova 400±50 years ago, based on its light echo19, 20) in the Large Magellanic Cloud contains no ex-companion star to a visual magnitude limit of 26.9 (an absolute magnitude of MV = +8.4) within a region of radius 1.43 arcseconds. (This corresponds to the 3σ maximum distance to which a companion could have been ‘kicked’ by the explosion.) This lack of any ex-companion star to deep limits rules out all published single-degenerate models for this supernova. The only remaining possibility is that the progenitor of this particular type Ia supernova was a double-degenerate system.


  1. Branch, D., Livio, M., Yungelson, L. R., Boffi, F. R. & Baron, E. In search of the progenitors of type Ia supernova. Publ. Astron. Soc. Pacif. 107, 10191029 (1995)
  2. Webbink, R. F. Double white dwarfs as progenitors of R Coronae Borealis stars and type I supernovae. Astrophys. J. 277, 355360 (1984)
  3. van Kerkwijk, M. H., Chang, P. & Justham, S. Sub-Chandrasekhar white dwarf mergers as the progenitors of type Ia supernovae. Astrophys. J. 722, L157L161 (2010)
  4. Iben, I. & Tutukov, A. V. Supernovae of type I as end products of the evolution of binaries with components of moderate initial mass (M≤9Mo˙). Astrophys. J. Suppl. Ser. 54, 335372 (1984)
  5. Whelan, J. & Iben, I. Binaries and supernovae of type I. Astrophys. J. 186, 10071014 (1973)
  6. Gilfanov, M. & Bogdan, A. An upper limit on the contribution of accreting white dwarfs to the type Ia supernova rate. Nature 463, 924925 (2010)
  7. Meng, X.-C. & Yang, W.-M. Binary population synthesis study of the supersoft X-ray phase of single degenerate type Ia supernova progenitors. Res. Astron. Astrophys. 11, 965973 (2011)
  8. Di Stefano, R. The progenitors of type Ia supernovae. II. Are they double-degenerate binaries? The symbiotic channel. Astrophys. J. 719, 474482 (2010)
  9. Hachisu, I., Kato, M. & Nomoto, K. Supersoft X-ray phase of single degenerate type Ia supernova progenitors in early-type galaxies. Astrophys. J. 724, L212L216 (2010)
  10. Lipunov, V. M., Panchenko, I. E. & Pruzhinskaya, M. V. The mechanism of supernova Ia explosions in elliptical galaxies. N. Astron. 16, 250252 (2011)
  11. Orio, M., Nelson, T., Bianchini, A., Di Mille, F. & Harbeck, D. A census of the supersoft X-ray sources in M31. Astrophys. J. 717, 739765 (2010)
  12. Ruiz-Lapuente, P. The quest for a supernova companion. Science 276, 18131814 (1997)
  13. Canal, R., Mendez, J. & Ruiz-Lapuente, P. Identification of the companion stars of type Ia supernovae. Astrophys. J. 550, L53L56 (2001)
  14. Ruiz-Lapuente, P. et al. The binary progenitor of Tycho Brahe’s 1572 supernova. Nature 431, 10691072 (2004)
  15. Kerzendorf, W. E. et al. Subaru high-resolution spectroscopy of star G in the Tycho supernova remnant. Astrophys. J. 701, 16651672 (2009)
  16. Ozaki, J. & Shigeyama, T. A method to identify the companion stars of type Ia supernovae in young supernova remnants. Astrophys. J. 644, 954958 (2006)
  17. Ihara, Y. et al. Searching for a companion star of Tycho’s type Ia supernova with optical spectroscopic observations. Publ. Astron. Soc. Jpn 59, 811826 (2007)
  18. Gonzalez Hernandez, J. I. et al. The chemical abundances of Tycho G in supernova remnant 1572. Astrophys. J. 691, 115 (2009)
  19. Rest, A. et al. Light echoes from ancient supernovae in the Large Magellanic Cloud. Nature 438, 11321134 (2005)
  20. Rest, A. et al. Spectral identification of an ancient supernova using light echoes in the Large Magellanic Cloud. Astrophys. J. 680, 11371148 (2008)
  21. Mannucci, F., Della Valle, M. & Panagia, N. Two populations of progenitors for type Ia supernovae? Mon. Not. R. Astron. Soc. 370, 773783 (2006)
  22. Marietta, E., Burrows, A. & Fryxell, B. Type Ia supernova explosions in binary systems: the impact on the secondary star and its consequences. Astrophys. J. Suppl. Ser. 128, 615650 (2000)
  23. Pan, K.-C., Ricker, P. & Taam, R. E. Impact of type Ia supernova ejecta on a helium-star binary companion. Astrophys. J. 715, 7885 (2010)
  24. Podsiadlowski, P. On the evolution and appearance of a surviving companion after a type Ia supernova explosions. Preprint at left fence fence (2003)
  25. Hughes, J. P. et al. ASCA observations of the Large Magellanic Cloud supernova remnant sample: typing supernovae from their remnants. Astrophys. J. 444, L81L84 (1995)
  26. Badenes, C., Harris, J., Zaritsky, D. & Prieto, J. L. The stellar ancestry of supernovae in the Magellanic Clouds – I. The most recent supernovae in the Large Magellanic Cloud. Astrophys. J. 700, 727740 (2009)
  27. Borkowski, K. J. et al. Dust destruction in type Ia supernovae remnants in the Large Magellanic Cloud. Astrophys. J. 642, L141L144 (2006)
  28. Helder, E. A., Kosenko, D. & Vink, J. Cosmic-ray acceleration efficiency versus temperature equilibration: the case of SNR 0509–67.5. Astrophys. J. 719, L140L144 (2010)

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  1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA

    • Bradley E. Schaefer &
    • Ashley Pagnotta


The authors shared the ideas, the data analysis, and the writing of this paper.

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