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Luminous radio emission from the superluminous supernova 2017ens at 3.3 yr after explosion
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(2023) Luminous radio emission from the superluminous supernova 2017ens at 3.3 yr after explosion. The Astrophysical Journal Letters, 954 (2). L45. doi:10.3847/2041-8213/acf1fd ISSN 2041-8213.
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Official URL: https://doi.org/10.3847/2041-8213/acf1fd
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 Ṁ≈10−4M☉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: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Supernovae, Radio sources (Astronomy), Stellar activity | ||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | The Astrophysical Journal Letters | ||||||||||||||||||||||||||||||||||||||||||
Publisher: | The American Astronomical Society | ||||||||||||||||||||||||||||||||||||||||||
ISSN: | 2041-8213 | ||||||||||||||||||||||||||||||||||||||||||
Official Date: | 11 September 2023 | ||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 954 | ||||||||||||||||||||||||||||||||||||||||||
Number: | 2 | ||||||||||||||||||||||||||||||||||||||||||
Article Number: | L45 | ||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.3847/2041-8213/acf1fd | ||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||
Re-use Statement: | |||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 18 December 2023 | ||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 18 December 2023 | ||||||||||||||||||||||||||||||||||||||||||
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