Published March 2025 | Version Published
Journal Article Open

Sample of hydrogen-rich superluminous supernovae from the Zwicky Transient Facility

  • 1. ROR icon Stockholm University
  • 2. ROR icon Northwestern University
  • 3. ROR icon California Institute of Technology
  • 4. ROR icon Weizmann Institute of Science
  • 5. ROR icon Liverpool John Moores University
  • 6. ROR icon National Central University
  • 7. ROR icon University of Maryland, College Park
  • 8. ROR icon Goddard Space Flight Center
  • 9. ROR icon Infrared Processing and Analysis Center
  • 10. ROR icon Cornell University
  • 11. ROR icon Leiden University
  • 12. ROR icon University of Turku
  • 13. ROR icon University of Washington
  • 14. ROR icon University of California, Berkeley
  • 15. ROR icon Lawrence Berkeley National Laboratory

Abstract

Context. Hydrogen-rich superluminous supernovae (SLSNe II) are rare. The exact mechanism producing their extreme light curve peaks is not understood. Analysis of single events and small samples suggest that circumstellar material (CSM) interaction is the main mechanism responsible for the observed features. However, other mechanisms cannot be discarded. Large sample analysis can provide clarification. Aims. We aim to characterize the light curves of a sample of 107 SLSNe II to provide valuable information that can be used to validate theoretical models. Methods. We analyzed the gri light curves of SLSNe II obtained through ZTF. We studied the peak absolute magnitudes and characteristic timescales. When possible, we computed the g − r colors and pseudo-bolometric light curves, and estimated lower limits for their total radiated energy. We also studied the luminosity distribution of our sample and estimated the fraction that would be observable by the LSST. Finally, we compared our sample to other H-rich SNe and to H-poor SLSNe I. Results. SLSNe II are heterogeneous. Their median peak absolute magnitude is ∼ − 20.3 mag in optical bands. Their rise can take from ∼two weeks to over three months, and their decline times range from ∼twenty days to over a year. We found no significant correlations between peak magnitude and timescales. SLSNe II tend to show fainter peaks, longer declines, and redder colors than SLSNe I. Conclusions. We present the largest sample of SLSN II light curves to date, comprising 107 events. Their diversity could be explained by different CSM morphologies, although theoretical analysis is needed to explore alternative scenarios. Other luminous transients, such as active galactic nuclei, tidal disruption events or SNe Ia-CSM, can easily become contaminants. Thus, good multiwavelength light curve coverage becomes paramount. LSST could miss ∼30% of the ZTF events in its gri band footprint.

Copyright and License

© The Authors 2025. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Acknowledgement

PJP thanks Laureano Martinez, Stephen Thorp and Takashi Nagao for useful discussions. We thank the referee for the valuable revision. Funded by the European Union (ERC, project number 101042299, TransPIre). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency. Neither the European Union nor the granting authority can be held responsible for them. AGY’s research is supported by the ISF GW excellence center, as well as the André Deloro Institute for Space and Optics Research, the Center for Experimental Physics, the Norman E Alexander Family M Foundation ULTRASAT Data Center Fund, and Yeda-Sela; AGY is the incumbent of The Arlyn Imberman Professorial Chair. T.-W.C. acknowledges the Yushan Fellow Program by the Ministry of Education, Taiwan for the financial support (MOE-111-YSFMS-0008-001-P1). MMK acknowledges generous support from the David and Lucille Packard Foundation. This work was supported by the GROWTH project (Kasliwal et al. 2019) funded by the National Science Foundation under Grant No. 1545949. This work is based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grants No. AST-1440341 and AST-2034437 and a collaboration including current partners Caltech, IPAC, the Weizmann Institute of Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, IN2P3, University of Warwick, Ruhr University Bochum, Northwestern University and former partners the University of Washington, Los Alamos National Laboratories, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant No. 12540303 (PI: Graham). The SED Machine is based upon work supported by the National Science Foundation under Grant No. 1106171 This work has made use of data from the Asteroid Terrestrial-impact Last Alert System (ATLAS) project. The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for near earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen’s University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile. This research has made use of the NASA/IPAC Extragalactic Database, which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology.

Data Availability

Sample information, observing logs and measured parameters can be found on https://zenodo.org/records/14711673. All the classification spectra can be found on https://www.wis-tns.org/

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Additional details

Related works

Is new version of
Discussion Paper: arXiv:2408.15086 (arXiv)
Is supplemented by
Dataset: https://zenodo.org/records/14711673 (URL)

Funding

European Research Council
TransPIre 10104229
Israel Science Foundation
Yeda Research and Development (Israel)
Ministry of Education
MOE-111-YSFMS-0008-001-P1
David and Lucile Packard Foundation
National Science Foundation
OISE-1545949
National Science Foundation
AST-1440341
National Science Foundation
AST-2034437
Heising-Simons Foundation
12540303
National Science Foundation
1106171
National Aeronautics and Space Administration
NN12AR55G
National Aeronautics and Space Administration
80NSSC18K0284
National Aeronautics and Space Administration
80NSSC18K1575
National Aeronautics and Space Administration
J1944/80NSSC19K0112
National Aeronautics and Space Administration
HST GO-15889
Science and Technology Facilities Council
ST/T000198/1
Science and Technology Facilities Council
ST/S006109/1

Dates

Accepted
2025-01-20
Available
2025-03-14
Published online

Caltech Custom Metadata

Caltech groups
Astronomy Department, Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility, Division of Physics, Mathematics and Astronomy (PMA)
Publication Status
Published