Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/25080
Title: | LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation | Authors: | 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, Stefano BOTTICELLA, MARIA TERESA Campbell, H. Chen, T. -W. Galbany, L. McKinnon, R. Nicholl, M. Smith, K. W. Sullivan, M. Takáts, K. Valenti, S. Young, D. R. |
Issue Date: | 2016 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 588 | First Page: | A1 | Abstract: | 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 He II, N III, and C III, 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 0.1 Z<SUB>☉</SUB>. 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. <P />The reduced spectra are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/588/A1">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/588/A1 | URI: | http://hdl.handle.net/20.500.12386/25080 | URL: | https://www.aanda.org/articles/aa/abs/2016/04/aa27682-15/aa27682-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201527682 | Bibcode ADS: | 2016A&A...588A...1P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
LSQ13fn.pdf | PDF editoriale | 2.21 MB | Adobe PDF | View/Open |
Page view(s)
46
checked on Mar 28, 2024
Download(s)
9
checked on Mar 28, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.