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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 |
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| 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 |
| Related URLs: | |
| Date Deposited: | 29 Sep 2020 10:51 |
| Last Modified: | 04 Sep 2021 06:36 |
| DOI or ID number: | 10.3847/1538-4357/abaa3d |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/13745 |
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