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Luminous Radio Emis...
Luminous Radio Emission from the Superluminous Supernova 2017ens at 3.3 yr after Explosion
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Margutti, Raffaella (author)
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Bright, J. S. (author)
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Matthews, D. J. (author)
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Coppejans, D. L. (author)
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Alexander, K. D. (author)
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Berger, E. (author)
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Bietenholz, M. (author)
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Chornock, R. (author)
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DeMarchi, L. (author)
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Drout, M. R. (author)
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Eftekhari, T. (author)
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Jacobson-Galán, W. V. (author)
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Laskar, T. (author)
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Milisavljevic, D. (author)
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Murase, K. (author)
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Nicholl, M. (author)
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- Omand, Conor Michael Bruce, 1992- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Stroh, M. (author)
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Terreran, G. (author)
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VanderLey, B. A. (author)
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 954:2
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- 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 Lν ≈ 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 ≈ 10−4 M☉ yr−1 at r ∼ 1017 cm from the explosion's site, for a wind speed of vw = 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Core-collapse supernovae; Extragalactic radio sources
Publication and Content Type
- ref (subject category)
- art (subject category)
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Margutti, Raffae ...
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Bright, J. S.
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Matthews, D. J.
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Coppejans, D. L.
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Alexander, K. D.
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Berger, E.
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show more...
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Bietenholz, M.
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Chornock, R.
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DeMarchi, L.
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Drout, M. R.
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Eftekhari, T.
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Jacobson-Galán, ...
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Laskar, T.
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Milisavljevic, D ...
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Murase, K.
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Nicholl, M.
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Omand, Conor Mic ...
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Stroh, M.
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Terreran, G.
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VanderLey, B. A.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University