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Margutti, R, Bright, JS, Matthews, DJ, Coppejans, DL, Alexander, KD, Berger, E, Bietenholz, M, Chornock, R, DeMarchi, L, Drout, MR, Eftekhari, T, Jacobson-Galán, WV, Laskar, T, Milisavljevic, D, Murase, K, Nicholl, M, Omand, CMB, Stroh, M, Terreran, G and VanderLey, BA (2023) Luminous Radio Emission from the Superluminous Supernova 2017ens at 3.3 yr after Explosion. Astrophysical Journal Letters, 954 (2). ISSN 2041-8205
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Abstract
We present the results from a multiyear radio campaign of the superluminous supernova (SLSN) SN 2017ens, which yielded the earliest radio detection of an SLSN to date at the age of ∼3.3 yr after explosion. SN 2017ens was not detected at radio frequencies in the first ∼300 days but reached L ν ≈ 1028 erg s−1 cm−2 Hz−1 at ν ∼ 6 GHz, ∼1250 days post explosion. Interpreting the radio observations in the context of synchrotron radiation from the supernova shock interaction with the circumstellar medium (CSM), we infer an effective mass-loss rate M ̇ ≈ 10 − 4 M ☉ yr − 1 at r ∼ 1017 cm from the explosion’s site, for a wind speed of v w = 50-60 km s−1 as measured from optical spectra. These findings are consistent with the spectroscopic metamorphosis of SN 2017ens from hydrogen poor to hydrogen rich ∼190 days after explosion reported by Chen et al. SN 2017ens is thus an addition to the sample of hydrogen-poor massive progenitors that explode shortly after having lost their hydrogen envelope. The inferred circumstellar densities, implying a CSM mass up to ∼0.5 M ☉, and low velocity of the ejection suggest that binary interactions (in the form of common-envelope evolution and subsequent envelope ejection) play a role in shaping the evolution of the stellar progenitors of SLSNe in the ≲500 yr preceding core collapse.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 25 Sep 2024 13:31 |
| Last Modified: | 25 Sep 2024 13:45 |
| DOI or ID number: | 10.3847/2041-8213/acf1fd |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24264 |
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