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

Kuncarayakti, H, Maeda, K, Ashall, CJ, Prentice, SJ, Mattila, S, Kankare, E, Fransson, C, Lundqvist, P, Pastorello, A, Leloudas, G, Anderson, JP, Benetti, S, Bersten, MC, Cappellaro, E, Cartier, R, Denneau, L, Della Valle, M, Elias-Rosa, N, Folatelli, G, Fraser, M , Galbany, L, Gall, C, Gal-Yam, A, Gutierrez, CP, Hamanowicz, A, Heinze, A, Inserra, C, Kangas, T, Mazzali, PA, Melandri, A, Pignata, G, Rest, A, Reynolds, T, Roy, R, Smartt, SJ, Smith, KW, Sollerman, J, Somero, A, Stalder, B, Stritzinger, M, Taddia, F, Tomasella, L, Tonry, J, Weiland, H and Young, DR (2018) SN 2017dio: A Type-Ic Supernova Exploding in a Hydrogen-rich Circumstellar Medium. The Astrophysical Journal Letters, 854 (1). ISSN 2041-8205

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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 ${M}_{g}=-17.6$ 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, $\dot{M}\sim 0.02{({\epsilon }_{{\rm{H}}\alpha }/0.01)}^{-1}$ (${v}_{\mathrm{wind}}/500$ km s−1) $({v}_{\mathrm{shock}}/$10,000 km s−1)−3 M ⊙ 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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
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Date Deposited: 15 Mar 2018 09:50
Last Modified: 15 Mar 2018 09:50
DOI or Identification number: 10.3847/2041-8213/aaaa1a
URI: http://researchonline.ljmu.ac.uk/id/eprint/8300

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