2016A&A...588A...1P


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET08:23:12

2016A&A...588A...1P - Astronomy and Astrophysics, volume 588A, 1-1 (2016/4-1)

LSQ 13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation.

POLSHAW J., KOTAK R., DESSART L., FRASER M., GAL-YAM A., INSERRA C., SIM S.A., SMARTT S.J., SOLLERMAN J., BALTAY C., RABINOWITZ D., BENETTI S., BOTTICELLA M.T., CAMPBELL H., CHEN T.-W., GALBANY L., McKINNON R., NICHOLL M., SMITH K.W., SULLIVAN M., TAKATS K., VALENTI S. and YOUNG D.R.

Abstract (from CDS):

We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to HeII, NIII, and CIII, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1Z☉. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.

Abstract Copyright: © ESO, 2016

Journal keyword(s): supernovae: general - supernovae: individual: LSQ13fn

VizieR on-line data: <Available at CDS (J/A+A/588/A1): tablea5.dat sp/*>

CDS comments: Tables A.3 and A.4 : star not identifed.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 2007pk SN* 01 31 47.07 +33 36 54.1     17.0     SNIInpec 34 1
2 SN 2009bw SN* 03 56 06.92 +72 55 40.9           SNII 56 1
3 SN 1999em SN* 04 41 27.04 -02 51 45.2   13.79 13.7     SNIIP 595 1
4 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4559 2
5 SN 2010al SN* 08 14 15.91 +18 26 18.2           SNIInpec 45 1
6 SN 2003Z SN* 09 07 32.46 +60 29 17.5     16.7     SNIIP 65 1
7 SN 1998S SN* 11 46 06.13 +47 28 55.4     12.2     SNIIn 390 1
8 LSQ 13fn SN* 11 51 17.29 -29 36 41.1           SNIIn 11 0
9 LEDA 727284 G 11 51 17.6 -29 36 37           ~ 4 0
10 SN 2014bc SN* 12 18 57.71 +47 18 11.3           SNIIP 14 1
11 SN 1983K SN* 12 49 12.23 -08 37 41.5   12.6       SNIIP 81 1
12 SN 1999br SN* 13 00 41.80 +02 29 45.8     17.5     SNIIPp 153 1
13 SN 2005cs SN* 13 29 53.37 +47 10 28.2   14.5       SNIIP 344 1
14 SN 2011fe SN* 14 03 05.711 +54 16 25.22   10.12 10.06     SNIa 532 1
15 SN 2013cu SN* 14 33 58.97 +40 14 20.7           SNII: 64 1
16 SN 2004et SN* 20 35 25.33 +60 07 17.7   12.88       SNIIP 422 1
17 SN 2009ip s*b 22 23 08.26 -28 56 52.4           LBV 282 0
18 SN 2002gd SN* 23 14 37.01 +04 30 06.1     16.7     SNII 52 1

    Equat.    Gal    SGal    Ecl

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2021.02.26-08:23:13

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