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Title: DES13S2cmm: The first superluminous supernova from the Dark Energy Survey

We present DES13S2cmm, the first spectroscopically-confirmed superluminous supernova (SLSN) from the Dark Energy Survey (DES). We briefly discuss the data and search algorithm used to find this event in the first year of DES operations, and outline the spectroscopic data obtained from the European Southern Observatory (ESO) Very Large Telescope to confirm its redshift (z = 0.663 ± 0.001 based on the host-galaxy emission lines) and likely spectral type (type I). Using this redshift, we find MpeakU = –21.05+0.10–0.09 for the peak, rest-frame U-band absolute magnitude, and find DES13S2cmm to be located in a faint, low-metallicity (sub-solar), low stellar-mass host galaxy (log(M/M⊙) = 9.3 ± 0.3), consistent with what is seen for other SLSNe-I. We compare the bolometric light curve of DES13S2cmm to fourteen similarly well-observed SLSNe-I in the literature and find it possesses one of the slowest declining tails (beyond +30 days rest frame past peak), and is the faintest at peak. Moreover, we find the bolometric light curves of all SLSNe-I studied herein possess a dispersion of only 0.2–0.3 magnitudes between +25 and +30 days after peak (rest frame) depending on redshift range studied; this could be important for ‘standardising’ such supernovae, as is done with the moremore » common type Ia. We fit the bolometric light curve of DES13S2cmm with two competing models for SLSNe-I – the radioactive decay of ⁵⁶Ni, and a magnetar – and find that while the magnetar is formally a better fit, neither model provides a compelling match to the data. Although we are unable to conclusively differentiate between these two physical models for this particular SLSN-I, further DES observations of more SLSNe-I should break this degeneracy, especially if the light curves of SLSNe-I can be observed beyond 100 days in the rest frame of the supernova.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [5] ;  [12] ;  [5] ;  [5] ;  [13] ;  [9] ;  [11] more »;  [9] ;  [14] ;  [5] ;  [8] ;  [14] ;  [15] ;  [16] ;  [15] ;  [5] ;  [17] ;  [18] ;  [18] ;  [6] ;  [19] ;  [8] ;  [20] ;  [21] ;  [8] ;  [22] ;  [21] ;  [23] ;  [24] ;  [14] ;  [13] ;  [8] ;  [15] ;  [18] ;  [25] ;  [6] ;  [8] ;  [21] ;  [26] ;  [18] ;  [27] ;  [28] ;  [29] ;  [30] ;  [31] ;  [8] ;  [21] ;  [29] ;  [8] ;  [24] ;  [32] ;  [21] ;  [10] ;  [8] ;  [33] ;  [34] « less
  1. Univ. of Portsmouth, Portsmouth (United Kingdom)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. of Southampton, Southampton (United Kingdom)
  4. Univ. of California, Berkeley, CA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Texas A & M Univ., College Station, TX (United States)
  7. National Center for Supercomputing Applications, Urbana, IL (United States); Univ. of Illinois Urban-Champaign, Urbana, IL (United States)
  8. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  9. Univ. of Pennsylvania, Philadelphia, PA (United States)
  10. Univ. of Illinois Urban-Champaign, Urbana, IL (United States);
  11. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  12. Univ. of Chicago, Chicago, IL (United States)
  13. Australian Astronomical Observatory (Australia)
  14. National Optical Astronomy Observatory, La Serena (Chile)
  15. Univ. College London, London (United Kingdom)
  16. National Center for Supercomputing Applications, Urbana, IL (United States); Space Telescope Science Institute, Baltimore, MD (United States)
  17. Carnegie Observatories, Pasadena, CA (United States)
  18. Observatorio Nacional, Rio de Janeiro (Brazil); Lab. Interinstitucional de e-Astronomia, Rio de Janeiro (Brazil)
  19. Ludwig Maximilian Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany)
  20. California Institute of Technology, Pasadena, CA (United States)
  21. Univ. of Michigan, Ann Arbor, MI (United States)
  22. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  23. Univ. Observatory Munich, Munich (Germany); Max Planck Institute for Extraterrestrial Physics, Garching (Germany)
  24. The Ohio State Univ., Columbus, OH (United States)
  25. ICRA, Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro (Brazil)
  26. Univ. Autonoma de Barcelona, Barcelona (Spain); Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain)
  27. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  28. Univ. of Sussex, Brighton (United Kingdom)
  29. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  30. Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas(CIEMAT), Madrid (Spain)
  31. Instituto de Fisica, Porto Alegre (Brazil); Lab. Interinstitucional de e-Astronomia, Rio de Janeiro (Brazil)
  32. National Center for Supercomputing Applications, Urbana, IL (United States)
  33. Stanford Univ., Stanford, CA (United States)
  34. Univ. of Manchester, Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
1201362
Report Number(s):
BNL--108182-2015-JA
Journal ID: ISSN 0035-8711; KA2301020
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 449; Journal Issue: 2; Conference: Naples (Italy), 3-5 Jun 2014; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS surveys - stars: supernova: general - stars: supernovae: DES13S2cmm