Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/25078
Titolo: | The multifaceted Type II-L supernova 2014G from pre-maximum to nebular phase | Autori: | Terreran, G. Jerkstrand, A. BENETTI, Stefano Smartt, S. J. Ochner, P. TOMASELLA, Lina Howell, D. A. Morales-Garoffolo, A. Harutyunyan, A. Kankare, E. Arcavi, I. CAPPELLARO, Enrico ELIAS DE LA ROSA, NANCY DEL CARMEN Hosseinzadeh, G. Kangas, T. PASTORELLO, Andrea Tartaglia, L. TURATTO, Massimo Valenti, S. Wiggins, P. Yuan, F. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 462 | Fascicolo: | 1 | Da pagina:: | 137 | Abstract: | We present multiband ultraviolet, optical, and near-infrared photometry, along with visual-wavelength spectroscopy, of supernova (SN) 2014G in the nearby galaxy NGC 3448 (25 Mpc). The early-phase spectra show strong emission lines of the high ionization species He II/N IV/C IV during the first 2-3 d after explosion, traces of a metal-rich circumstellar material (CSM) probably due to pre-explosion mass-loss events. These disappear by day 9 and the spectral evolution then continues matching that of normal Type II SNe. The post-maximum light curve declines at a rate typical of Type II-L class. The extensive photometric coverage tracks the drop from the photospheric stage and constrains the radioactive tail, with a steeper decline rate than that expected from the <SUP>56</SUP>Co decay if γ-rays are fully trapped by the ejecta. We report the appearance of an unusual feature on the blue side of H α after 100 d, which evolves to appear as a flat spectral feature linking H α and the [O I] doublet. This may be due to interaction of the ejecta with a strongly asymmetric, and possibly bipolar CSM. Finally, we report two deep spectra at ∼190 and 340 d after explosion, the latter being arguably one of the latest spectra for a Type II-L SN. By modelling the spectral region around the [Ca II], we find a supersolar Ni/Fe production. The strength of the [O I] λλ6300,6363 doublet, compared with synthetic nebular spectra, suggests a progenitor with a zero-age main-sequence mass between 15 and 19 M<SUB>☉</SUB>. | URI: | http://hdl.handle.net/20.500.12386/25078 | URL: | https://academic.oup.com/mnras/article/462/1/137/2589460 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1591 | Bibcode ADS: | 2016MNRAS.462..137T | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
SN2014G.pdf | PDF editoriale | 5.14 MB | Adobe PDF | Visualizza/apri |
Page view(s)
62
controllato il 18-apr-2024
Download(s)
37
controllato il 18-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.