TY - JOUR
T1 - The nearby Type Ibn supernova 2015G
T2 - Signatures of asymmetry and progenitor constraints
AU - Shivvers, Isaac
AU - Zheng, Wei Kang
AU - Van Dyk, Schuyler D.
AU - Mauerhan, Jon
AU - Filippenko, Alexei V.
AU - Smith, Nathan
AU - Foley, Ryan J.
AU - Mazzali, Paolo
AU - Kamble, Atish
AU - Kilpatrick, Charles D.
AU - Margutti, Raffaella
AU - Yuk, Heechan
AU - Graham, Melissa L.
AU - Kelly, Patrick L.
AU - Andrews, Jennifer
AU - Matheson, Thomas
AU - Michael Wood-Vasey, W.
AU - Ponder, Kara A.
AU - Brown, Peter J.
AU - Chevalier, Roger
AU - Milisavljevic, Dan
AU - Drout, Maria
AU - Parrent, Jerod
AU - Soderberg, Alicia
AU - Ashall, Chris
AU - Piascik, Andrzej
AU - Prentice, Simon
PY - 2017
Y1 - 2017
N2 - We present the results of an extensive observational campaign on the nearby Type Ibn SN 2015G, including data from radio through ultravioletwavelengths. SN2015Gwas asymmetric, showing late-time nebular lines redshifted by ~1000 km s-1. It shared many features with the prototypical SN Ibn 2006jc, including extremely strong He I emission lines and a late-time blue pseudo-continuum. The young SN 2015G showed narrow P-Cygni profiles of He I, but never in its evolution did it showany signature of hydrogen - arguing for a dense, ionized and hydrogenfree circumstellar medium moving outward with a velocity of ~1000 km s-1 and created by relatively recent mass-loss from the progenitor star. Ultraviolet through infrared observations show that the fading SN 2015G (which was probably discovered some 20 d post-peak) had a spectral energy distribution that was well described by a simple, single-component blackbody. Archival HST images provide upper limits on the luminosity of SN 2015G's progenitor, while non-detections of any luminous radio afterglow and optical non-detections of outbursts over the past two decades provide constraints upon its mass-loss history.
AB - We present the results of an extensive observational campaign on the nearby Type Ibn SN 2015G, including data from radio through ultravioletwavelengths. SN2015Gwas asymmetric, showing late-time nebular lines redshifted by ~1000 km s-1. It shared many features with the prototypical SN Ibn 2006jc, including extremely strong He I emission lines and a late-time blue pseudo-continuum. The young SN 2015G showed narrow P-Cygni profiles of He I, but never in its evolution did it showany signature of hydrogen - arguing for a dense, ionized and hydrogenfree circumstellar medium moving outward with a velocity of ~1000 km s-1 and created by relatively recent mass-loss from the progenitor star. Ultraviolet through infrared observations show that the fading SN 2015G (which was probably discovered some 20 d post-peak) had a spectral energy distribution that was well described by a simple, single-component blackbody. Archival HST images provide upper limits on the luminosity of SN 2015G's progenitor, while non-detections of any luminous radio afterglow and optical non-detections of outbursts over the past two decades provide constraints upon its mass-loss history.
KW - Stars: mass-loss
KW - Supernovae: individual: (SN 2015G)
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U2 - 10.1093/MNRAS/STX1885
DO - 10.1093/MNRAS/STX1885
M3 - Article
AN - SCOPUS:85042527188
VL - 471
SP - 4381
EP - 4397
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 4
ER -