Astrophysical Bulletin

, Volume 71, Issue 4, pp 422–435 | Cite as

SN2015bh in NGC 2770: LBV core collapse in merging of binary system components

  • V. P. Goranskij
  • E. A. Barsukova
  • A. F. Valeev
  • D. Yu. Tsvetkov
  • I. M. Volkov
  • V. G. Metlov
  • A. V. Zharova
Article

Abstract

We present spectroscopy and multicolor photometry for the optical transient PSN J09093496+3307204 in the galaxy NGC2770, which has afterwards been transferred into the supernova phase and got the name SN2015bh. Medium-resolution spectral observations were carried out between February 2015 to May 2016 using the focal reducer SCORPIO at the 6-m Russian telescope BTA. They were followed by by photometric observations at the BTA and six other telescopes with 0.5–1m apertures. Both at the phase of the SN impostor (2015a) and at the supernova phase (2015b), besides Balmer emissions, the strong Fe II emissions are seen in the spectrum; so, these spectra resemble those of Williams Fe II type classical novae. Taking into account circumstellar, interstellar and galactic absorption, AV = 1.m 14 ±0.m 15), we determined maximum absolute magnitudes of the object to be MV =–15.m 0 ±0.m 3 at the 2015a phase and of MV =–18.m 14 ±0.m 30 at the 2015b phase. The light curve at the 2015b phase is similar to those of SN IIL. The supernova progenitor is a luminous blue variable (LBV) star with the powerful Hα emission. We consider several hypotheses of supernovae explosions following optical transients related with LBV. The hypothesis of core collapse of an evolved massive star interrupting the process of its merging with massive companion in a binary system (a failed luminous red nova) was chosen as the preferable one for this event.

Keywords

supernovae general—novae, cataclysmic variables—supernovae individual SN2015bh PSNJ09093496+3307204 

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References

  1. 1.
    N. Elias-Rosa, S. Benetti, L. Tomasella, et al., Astronomer’s Telegram No. 7042 (2015).Google Scholar
  2. 2.
    S. D. Van Dyk, D. Schuyler, C. Y. Peng, et al., Publ. Astron. Soc. Pacific 112, 1532 (2000).ADSCrossRefGoogle Scholar
  3. 3.
    A. de Ugarte Postigo, G. Leloudas, C. C. Thöne, et al., Astronomer’s Telegram No. 7409 (2015).Google Scholar
  4. 4.
    A. de Ugarte Postigo, C. C. Thöne, G. Lelaudas, and F. Aceituno, Astronomer’s Telegram No. 7514 (2015).Google Scholar
  5. 5.
    G. Duggan, E. Bellm, G. Leloudas, et al., Astronomer’s Telegram No. 7515 (2015).Google Scholar
  6. 6.
    J. C. Mauerhan, N. Smith, A. V. Filippenko, et al., Monthly Notices Royal Astron. Soc. 430, 1801 (2013).ADSCrossRefGoogle Scholar
  7. 7.
    R. Margutti, D.Milisavljevic, A.M. Soderberg, et al., Astrophys. J. 780, 21 (2014).ADSCrossRefGoogle Scholar
  8. 8.
    M. L. Graham, D. J. Sand, S. Valenti, et al., Astrophys. J. 787, 163 (2014).ADSCrossRefGoogle Scholar
  9. 9.
    A. Pastorello, E. Cappellaro, C. Inserra, et al., Astrophys. J. 767, 1 (2013).ADSCrossRefGoogle Scholar
  10. 10.
    S. Campana, C. C. Thöne, G. Leloudas, et al., Astronomer’s Telegram No. 7517 (2015).Google Scholar
  11. 11.
    J. Vinko, K. Sarneczky, and K. Vida, Astronomer’s Telegram No. 7541 (2015).Google Scholar
  12. 12.
    N. Richardson and E. Artigau, Astronomer’s Telegram No. 7543 (2015).Google Scholar
  13. 13.
    C. C. Thöne, M. J. Michalowski, G. Leloudas, et al., Astrophys. J. 698, 1307 (2009).ADSCrossRefGoogle Scholar
  14. 14.
    V. L. Afanasiev and A. V. Moiseev, Astron. Lett. 31, 194 (2005).ADSCrossRefGoogle Scholar
  15. 15.
    M. Modjaz, W. Li, N. Butler, et al., Astrophys. J. 702, 226 (2009).ADSCrossRefGoogle Scholar
  16. 16.
    M. Fukugita, T. Ichikawa, J. E. Gunn, et al., Astron. J. 111, 1748 (1996).ADSCrossRefGoogle Scholar
  17. 17.
    J. B. Oke, Astron. J. 99, 1621 (1990).ADSCrossRefGoogle Scholar
  18. 18.
    J. P. Anderson, S. González-Gaitán, M. Hamuy, et al., Astrophys. J. 786, 67 (2014).ADSCrossRefGoogle Scholar
  19. 19.
    N. Smith, J. E. Andrews, S. D. van Dyk, et al., Monthly Notices Royal Astron. Soc. 458, 950 (2016).ADSCrossRefGoogle Scholar
  20. 20.
    R. Williams, Astron. J. 144, 98 (2012).ADSCrossRefGoogle Scholar
  21. 21.
    R. M. Humphreys, J. C. Martin, in Eta Carinae and the Supernova Impostors. Ed. K. Davidson & R.M. Humphreys (New York, Springer, 2012) 384, p. 1.Google Scholar
  22. 22.
    J. Mauerhan, G. G. Williams, N. Smith, et al., Monthly Notices Royal Astron. Soc. 442, 1166 (2014).ADSCrossRefGoogle Scholar
  23. 23.
    E. A. Barsukova, V. P. Goranskij, A. F. Valeev, and S. S. Kaisin, Variable Stars 34, No. 4, p. 1 (2014).Google Scholar
  24. 24.
    A. Pastorello, S. J. Smartt, M. T. Botticella, et al., Astrophys. J. 724, L16 (2010).ADSCrossRefGoogle Scholar
  25. 25.
    V. P. Goranskij, E. A. Barsukova, O. I. Spiridonova, et al., Astrophysical Bulletin 71, 82 (2016).ADSCrossRefGoogle Scholar
  26. 26.
    R. M. Humphreys and K. Davidson, Astrophys. J. 232, 409 (1979).ADSCrossRefGoogle Scholar
  27. 27.
    L. Tartaglia, A. Pastorello, M. Sullivan, et al., Monthly Notices Royal Astron. Soc. 459, 1039 (2016).ADSCrossRefGoogle Scholar
  28. 28.
    N. Smith, J. C. Mauerhan, J. L. Prieto, Monthly Notices Royal Astron. Soc. 438, 1191 (2014).ADSCrossRefGoogle Scholar
  29. 29.
    M. Fraser, M. Magee, R. Kotak, et al., Astrophys. J. 779, L8 (2013).ADSCrossRefGoogle Scholar
  30. 30.
    S. E. Woosley, S. Blinnikov, A. Heger, Nature 450, 390 (2007)ADSCrossRefGoogle Scholar
  31. 31.
    A. Heger, in Eta Carinae and the Supernovae Impostors, Ed. K. Davidson & R. M. Humphreys (New York, Springer, 2012) 384, p.299.Google Scholar
  32. 32.
    N. Soker and A. Kashi, Astrophys. J. 764, L6 (2013).ADSCrossRefGoogle Scholar
  33. 33.
    C. Thöne, A. de Ugarte Postigo, G. Leloudas, et al., in Frontiers of Massive-Star Evolution and Core-Collapse Supernovae. Symposium S16 at EWASS 2016. Paper No. 1133, abstract (2016).Google Scholar
  34. 34.
    M. F. Corcoran and K. Ishibashi, in Eta Carinae and the Supernova Impostors. Ed. K. Davidson and R. M. Humphreys (New York, Springer, 2012) 384, p.195.Google Scholar
  35. 35.
    E. A. Barsukova, V. P. Goranskij, A. F. Valeev, and A. V. Zharova, Astrophysical Bulletin 69, 67 (2014).ADSCrossRefGoogle Scholar
  36. 36.
    P. Martini, R. M. Wagner, A. Tomaney, et al., Astrophys. J. 118, 1034 (1999).Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • V. P. Goranskij
    • 1
  • E. A. Barsukova
    • 2
  • A. F. Valeev
    • 2
    • 3
  • D. Yu. Tsvetkov
    • 4
  • I. M. Volkov
    • 4
  • V. G. Metlov
    • 4
  • A. V. Zharova
    • 4
  1. 1.Sternberg Astronomical InstituteLomonosovMoscow State UniversityMoscowRussia
  2. 2.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnii ArkhyzRussia
  3. 3.Kazan (Volga Region)Federal UniversityKazanRussia
  4. 4.Sternberg Astronomical InstituteLomonosov Moscow State UniversityMoscowRussia

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