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SN2019dge: A Helium-rich Ultra-stripped Envelope Supernova

Yao, Y, De, K, Kasliwal, MM, Ho, AYQ, Schulze, S, Li, Z, Kulkarni, SR, Fruchter, A, Rubin, D, Perley, DA, Fuller, J, Piro, AL, Fremling, C, Bellm, EC, Burruss, R, Duev, DA, Feeney, M, Gal-Yam, A, Golkhou, VZ, Graham, MJ , Helou, G, Kupfer, T, Laher, RR, Masci, FJ, Miller, AA, Ben, R, Shupe, DL, Smith, R, Sollerman, J, Soumagnac, MT and Zolkower, J (2020) SN2019dge: A Helium-rich Ultra-stripped Envelope Supernova. Astrophysical Journal, 900 (1). ISSN 0004-637X

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Abstract

We present observations of ZTF18abfcmjw (SN2019dge), a helium-rich supernova with a fast-evolving light curve indicating an extremely low ejecta mass (≈0.33 M⊙) and low kinetic energy (≈1.3 × 1050 erg). Early-time (<4 days after explosion) photometry reveals evidence of shock cooling from an extended helium-rich envelope of ~0.1 M⊙ located ~1.2 × 1013 cm from the progenitor. Early-time He II line emission and subsequent spectra show signatures of interaction with helium-rich circumstellar material, which extends from gsim5 × 1013 cm to gsim2 × 1016 cm. We interpret SN2019dge as a helium-rich supernova from an ultra-stripped progenitor, which originates from a close binary system consisting of a mass-losing helium star and a low-mass main-sequence star or a compact object (i.e., a white dwarf, a neutron star, or a black hole). We infer that the local volumetric birth rate of 19dge-like ultra-stripped SNe is in the range of 1400–8200$\,{\mathrm{Gpc}}^{-3}\,{\mathrm{yr}}^{-1}$ (i.e., 2%–12% of core-collapse supernova rate). This can be compared to the observed coalescence rate of compact neutron star binaries that are not formed by dynamical capture.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
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Date Deposited: 29 Sep 2020 10:51
Last Modified: 29 Sep 2020 11:30
DOI or Identification number: 10.3847/1538-4357/abaa3d
URI: https://researchonline.ljmu.ac.uk/id/eprint/13745

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