Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27541
DC Field | Value | Language |
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dc.contributor.author | Gangopadhyay, Anjasha | en_US |
dc.contributor.author | Misra, Kuntal | en_US |
dc.contributor.author | PASTORELLO, Andrea | en_US |
dc.contributor.author | Sahu, D. K. | en_US |
dc.contributor.author | TOMASELLA, Lina | en_US |
dc.contributor.author | Tartaglia, L. | en_US |
dc.contributor.author | Singh, Mridweeka | en_US |
dc.contributor.author | Dastidar, Raya | en_US |
dc.contributor.author | Srivastav, S. | en_US |
dc.contributor.author | Ochner, P. | en_US |
dc.contributor.author | Brown, Peter J. | en_US |
dc.contributor.author | Anupama, G. C. | en_US |
dc.contributor.author | BENETTI, Stefano | en_US |
dc.contributor.author | CAPPELLARO, Enrico | en_US |
dc.contributor.author | Kumar, Brajesh | en_US |
dc.contributor.author | Kumar, Brijesh | en_US |
dc.contributor.author | Pandey, S. B. | en_US |
dc.date.accessioned | 2020-10-02T08:57:29Z | - |
dc.date.available | 2020-10-02T08:57:29Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27541 | - |
dc.description.abstract | We present results of the photometric (from 3 to 509 d post-explosion) and spectroscopic (up to 230 d post-explosion) monitoring campaign of the He-rich Type IIb supernova (SN) 2015as. The (B − V) colour evolution of SN 2015as closely resemble those of SN 2008ax, suggesting that SN 2015as belongs to the SN IIb subgroup that does not show the early, short-duration photometric peak. The light curve of SN 2015as reaches the B-band maximum about 22 d after the explosion, at an absolute magnitude of −16.82 ± 0.18 mag. At ∼75 d after the explosion, its spectrum transitions from that of a SN II to a SN Ib. P Cygni features due to He i lines appear at around 30 d after explosion, indicating that the progenitor of SN 2015as was partially stripped. For SN 2015as, we estimate a <SUP>56</SUP>Ni mass of ∼0.08 M<SUB>☉</SUB> and ejecta mass of 1.1-2.2 M<SUB>☉</SUB>, which are similar to the values inferred for SN 2008ax. The quasi-bolometric analytical light-curve modelling suggests that the progenitor of SN 2015as has a modest mass (∼0.1 M<SUB>☉</SUB>), a nearly compact (∼0.05 × 10<SUP>13</SUP> cm) H envelope on top of a dense, compact (∼2 × 10<SUP>11</SUP> cm) and a more massive (∼1.2 M<SUB>☉</SUB>) He core. The analysis of the nebular phase spectra indicates that ∼0.44 M<SUB>☉</SUB> of O is ejected in the explosion. The intensity ratio of the [Ca ii]/[O i] nebular lines favours either a main-sequence progenitor mass of ∼15 M<SUB>☉</SUB> or a Wolf-Rayet star of 20 M<SUB>☉</SUB>. | en_US |
dc.language.iso | eng | en_US |
dc.title | SN 2015as: a low-luminosity Type IIb supernova without an early light-curve peak | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/sty478 | en_US |
dc.identifier.scopus | 2-s2.0-85070080271 | en_US |
dc.identifier.isi | 000430944100053 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article-abstract/476/3/3611/4898084?redirectedFrom=fulltext | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 476 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 3611 | en_US |
dc.relation.lastpage | 3630 | en_US |
dc.relation.numberofpages | 20 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 17 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018MNRAS.476.3611G | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.orcid | 0000-0002-7259-4624 | - |
crisitem.author.orcid | 0000-0002-3697-2616 | - |
crisitem.author.orcid | 0000-0002-3256-0016 | - |
crisitem.author.orcid | 0000-0001-5008-8619 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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sty478.pdf | 3.5 MB | Adobe PDF | View/Open |
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