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Title: Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star

Here we report photometric and spectroscopic observations of the optical transient LSQ13zm. Historical data reveal the presence of an eruptive episode (that we label as ‘2013a’) followed by a much brighter outburst (‘2013b’) three weeks later, that we argue to be the genuine supernova explosion. This sequence of events closely resemble those observed for SN 2010mc and (in 2012) SN 2009ip. Furthermore, the absolute magnitude reached by LSQ13zm during 2013a (MR = -14.87 ± 0.25 mag) is comparable with those of supernova impostors, while that of the 2013b event (M R = -18.46 ± 0.21 mag) is consistent with those of interacting supernovae. Our spectra reveal the presence of a dense and structured circumstellar medium, probably produced through numerous pre-supernova mass-loss events. In addition, we find evidence for high-velocity ejecta, with a fraction of gas expelled at more than 20 000 km s -1. The spectra of LSQ13zm show remarkable similarity with those of well-studied core-collapse supernovae. From the analysis of the available photometric and spectroscopic data, we conclude that we first observed the last event of an eruptive sequence from a massive star, likely a Luminous Blue Variable, which a short time later exploded as a core-collapse supernova. Ourmore » detailed analysis of archival images suggests that the host galaxy is a star-forming Blue Dwarf Compact Galaxy.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [9] ;  [12] ;  [13] ;  [14] ;  [15] ;  [16] ;  [17] ;  [18] more »;  [18] ;  [19] ;  [19] ;  [19] ;  [19] ;  [20] ;  [19] ;  [21] ;  [22] ;  [23] ;  [24] ;  [25] ;  [26] ;  [19] ;  [27] ;  [28] ;  [19] ;  [19] ;  [29] ;  [30] « less
  1. INAF Astronomical Observatory of Padova (Italy); Univ. of Padua (Italy). Dept. of Physics and Astronomy
  2. Univ. of Padua (Italy). Dept. of Physics and Astronomy
  3. Univ. of Southampton (United Kingdom). School of Physics and Astronomy
  4. Yale Univ., New Haven, CT (United States). Dept. of Physics
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Cosmology Center
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Cosmology Center; Univ. of California, Berkeley, CA (United States). Dept. of Astronomy
  7. California Inst. of Technology (CalTech), Pasadena, CA (United States). Astronomy Dept.
  8. Weizmann Inst. of Science, Rehovot (Israel). Benoziyo Center for Astrophysics
  9. Special Astrophysical Observatory, Nizhnij Arkhyz (Russia); Kazan Federal Univ., Kazan (Russia)
  10. Special Astrophysical Observatory, Nizhnij Arkhyz (Russia)
  11. M.V. Lomonosov Moscow State Univ. (Russia)
  12. Special Astrophysical Observatory, Nizhnij Arkhyz (Russia);
  13. Millennium Inst. of Astrophysics, Santiago (Chile); Pontifical Catholic Univ. of Chile, Santiago (Chile). Inst. of Astrophysics
  14. European Southern Observatory, Santiago (Chile)
  15. Pontifical Catholic Univ. of Chile, Santiago (Chile). Inst. of Astrophysics; Millennium Inst. of Astrophysics, Santiago (Chile); Space Science Inst., Boulder, CO (United States)
  16. European Southern Observatories, Garching (Germany); Max Planck Society, Garching (Germany). Max Planck Inst. for Astrophysics
  17. Max Planck Society, Garching (Germany). Max Planck Inst. for Astrophysics
  18. Las Cumbres Observatory Global Telescope Network, Goleta, CA (United States); Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  19. INAF Astronomical Observatory of Padova (Italy)
  20. Univ. of Atacama, Copiapo (Chile). Dept. of Physics
  21. Italian National Institute of Astrophysics, Tenerife (Spain). Galileo National Telescope
  22. Univ. of Turku, Piikkio (Finland). Tuorla Observatory
  23. Univ. of Belfast (United Kingdom). Astronomy Research Center
  24. Univ. of Illinois, Springfield, IL (United States). Astronomy/ Physics
  25. Univ. of Turku, Piikkio (Finland). Finnish Center for Astronomy with ESO (FINCA) and Tuorla Observatory
  26. Inst. of Sciences of Spain (CSIC-IEEC), Barcelona (Spain)
  27. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  28. INAF Astronomical Observatory of Padova (Italy); Univ. of Belfast (United Kingdom). Astronomy Research Center
  29. Univ. of Padua (Italy). Center of Studies and Activities for Space (CISAS)
  30. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Space and Remote Sensing
Publication Date:
Report Number(s):
LA-UR-15-27629
Journal ID: ISSN 0035-8711
Grant/Contract Number:
AC52-06NA25396; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 459; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics
OSTI Identifier:
1334140
Alternate Identifier(s):
OSTI ID: 1393052