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Title: On The Early-Time Excess Emission In Hydrogen-Poor Superluminous Supernovae

Here, we present the light curves of the hydrogen-poor superluminous supernovae (SLSNe I) PTF 12dam and iPTF 13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF 12dam is very similar in duration (~10 days) and brightness relative to the main peak (2-3 mag fainter) compared to that observed in other SLSNe I. In contrast, the long-duration ( > 30 days) early excess emission in iPTF 13dcc, whose brightness competes with that of the main peak, appears to be of a different nature. We construct bolometric light curves for both targets, and fit a variety of light-curve models to both the early bump and main peak in an attempt to understand the nature of these explosions. Even though the slope of the late-time decline in the light curves of both SLSNe is suggestively close to that expected from the radioactive decay of 56Ni and 56Co, the amount of nickel required to power the full light curves is too large considering the estimated ejecta mass. The magnetar model including an increasing escape fraction provides a reasonable description of the PTF 12dam observations.more » However, neither the basic nor the double-peaked magnetar model is capable of reproducing the light curve of iPTF 13dcc. A model combining a shock breakout in an extended envelope with late-time magnetar energy injection provides a reasonable fit to the iPTF 13dcc observations. Finally, we find that the light curves of both PTF 12dam and iPTF 13dcc can be adequately fit with the model involving interaction with the circumstellar medium.« less
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [1] ;  [3] ; ORCiD logo [4] ; ORCiD logo [5] ;  [6] ; ORCiD logo [7] ; ORCiD logo [8] ; ORCiD logo [1] ; ORCiD logo [9] ;  [9] ;  [9] ;  [10] ; ORCiD logo [11] ; ORCiD logo [11] ; ORCiD logo [12] ; ORCiD logo [13] ;  [1] ; ORCiD logo [14] more »; ORCiD logo [14] ; ORCiD logo [15] ;  [1] ; ORCiD logo [1] ; ORCiD logo [14] ; ORCiD logo [16] ;  [17] ; ORCiD logo [18] ;  [19] ; ORCiD logo [14] « less
  1. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics
  2. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics; Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Centre
  3. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics; European Southern Observatory, Garching (Germany)
  4. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Centre; California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics
  5. San Diego State Univ., San Diego, CA (United States). Dept. of Astronomy; Univ. of Tokyo (Japan). Kavli IPMU (WPI), UTIAS
  6. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics; Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
  7. Univ. of Southampton (United Kingdom). School of Physics and Astronomy
  8. California Inst. of Technology (CalTech), Pasadena, CA (United States). Infrared Processing and Analysis Center
  9. Stockholm Univ. (Sweden). Oskar Klein Centre, Dept. of Astronomy
  10. Univ. of California, Davis, CA (United States). Dept. of Physics
  11. Univ. of California, Santa Barbara CA (United States). Dept. of Physics; Las Cumbres Observatory Global Telescope, Goleta, CA (United States)
  12. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy
  13. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Astrophysics Science Division
  14. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics
  15. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States). Smithsonian Astrophysical Observatory
  16. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Cosmology Center
  17. California Inst. of Technology (CalTech), Pasadena, CA (United States). Spitzer Science Center
  18. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  19. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-27777
Journal ID: ISSN 1538-4357; ark:/13030/qt8wd843qh
Grant/Contract Number:
AC02-05CH11231; NAS 5-26555; 615929; PF6-17014; AST-1211916; HST-HF-51296.01-A; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 835; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; supernovae; PTF 12dam; iPTF13dc; Astronomy and Astrophysics
OSTI Identifier:
1393607
Alternate Identifier(s):
OSTI ID: 1407903