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Early dust formation and a massive progenitor for SN 2011ja?

Andrews, JE; Krafton, KM; Clayton, GC; Montiel, E; Wesson, R; Sugerman, BEK; Barlow, MJ; ... Drass, H; + view all (2016) Early dust formation and a massive progenitor for SN 2011ja? Monthly Notices of the Royal Astronomical Society , 457 (3) pp. 3241-3253. 10.1093/mnras/stw164. Green open access

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Abstract

SN 2011ja was a bright (I = −18.3) Type II supernova occurring in the nearby edge on spiral galaxy NGC 4945. Flat-topped and multipeaked H α and H β spectral emission lines appear between 64 and 84 d post-explosion, indicating interaction with a disc-like circumstellar medium inclined ∼45° from edge-on. After day 84, an increase in the H- and K-band flux along with heavy attenuation of the red wing of the emission lines are strong indications of early dust formation, likely located in the cool dense shell created between the forward shock of the SN ejecta and the reverse shock created as the ejecta plows into the existing circumstellar material. Radiative transfer modelling reveals both ≈1 × 10^{-5} M_{⊙} of pre-existing dust located ∼10^{16.7} cm away and up to ≈6 × 10^{-4} M_{⊙} of newly formed dust. Spectral observations after 1.5 yr reveal the possibility that the fading SN is located within a young (3–6 Myr) massive stellar cluster, which when combined with tentative {56^Ni} mass estimates of 0.2 M_{⊙} may indicate a massive (≥25 M_{⊙}) progenitor for SN 2011ja.

Type: Article
Title: Early dust formation and a massive progenitor for SN 2011ja?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stw164
Publisher version: https://doi.org/10.1093/mnras/stw164
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisherís terms and conditions.
Keywords: circumstellar matter, supernovae: general, supernovae: individual: SN 20011ja, stars: winds, outflows
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10093763
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