SN 2017dio: A Type-Ic Supernova Exploding in a Hydrogen-rich Circumstellar Medium

Hanindyo Kuncarayakti, Keiichi Maeda, Christopher J. Ashall, Seppo Mattila, Erkki Kankare, Claes Fransson, Peter Lundqvist, Andrea Pastorello, Giorgos Leloudas, Stefano Benetti, Melina C. Bersten, Enrico Cappellaro, Régis Cartier, Larry Denneau, Massimo Della Valle, Nancy Elias-Rosa, Gastón Folatelli, Morgan Fraser, Lluís Galbany, Christa GallAvishay Gal-Yam, Claudia P. Gutiérrez, Aleksandra Hamanowicz, Ari Heinze, Cosimo Inserra, Tuomas Kangas, Paolo Mazzali, Andrea Melandri, Giuliano Pignata, Armin Rest, Thomas Reynolds, Rupak Roy, Stephen J. Smartt, Ken W. Smith, Jesper Sollerman, Auni Somero, Brian Stalder, Maximilian Stritzinger, Francesco Taddia, Lina Tomasella, John Tonry, Henry Weiland, David R. Young

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


SN 2017dio shows both spectral characteristics of a type-Ic supernova (SN) and signs of a hydrogen-rich circumstellar medium (CSM). Prominent, narrow emission lines of H and He are superposed on the continuum. Subsequent evolution revealed that the SN ejecta are interacting with the CSM. The initial SN Ic identification was confirmed by removing the CSM interaction component from the spectrum and comparing with known SNe Ic and, reversely, adding a CSM interaction component to the spectra of known SNe Ic and comparing them to SN 2017dio. Excellent agreement was obtained with both procedures, reinforcing the SN Ic classification. The light curve constrains the pre-interaction SN Ic peak absolute magnitude to be around Mg = -17.6 mag. No evidence of significant extinction is found, ruling out a brighter luminosity required by an SN Ia classification. These pieces of evidence support the view that SN 2017dio is an SN Ic, and therefore the first firm case of an SN Ic with signatures of hydrogen-rich CSM in the early spectrum. The CSM is unlikely to have been shaped by steady-state stellar winds. The mass loss of the progenitor star must have been intense, M ∼ 0.02 ϵ Hα/0.01)-1(vwind/500 km s-1) (vshock 10,000 kms-1)-3Me yr-1, peaking at a few decades before the SN. Such a high mass-loss rate might have been experienced by the progenitor through eruptions or binary stripping.

Original languageEnglish
Article numberL14
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 09 Feb 2018


  • supernovae: general
  • supernovae: individual (SN 2017dio)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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