التفاصيل البيبلوغرافية
| العنوان: |
SN 2015an: a normal luminosity type II supernova with low expansion velocity at early phases. |
| المؤلفون: |
Dastidar, Raya1,2 (AUTHOR) rdastidr@gmail.com, Misra, Kuntal1,3 (AUTHOR), Valenti, Stefano3 (AUTHOR), Burke, Jamison4,5 (AUTHOR), Hosseinzadeh, Griffin6 (AUTHOR), Gangopadhyay, Anjasha1,7 (AUTHOR), Howell, D Andrew4,5 (AUTHOR), Singh, Mridweeka1,8 (AUTHOR), Arcavi, Iair9 (AUTHOR), Kumar, Brijesh1 (AUTHOR), McCully, Curtis4,5 (AUTHOR), Sanwal, Pankaj1,7 (AUTHOR), Pandey, S B1 (AUTHOR) |
| المصدر: |
Monthly Notices of the Royal Astronomical Society. Dec2019, Vol. 490 Issue 2, p1605-1619. 15p. |
| مصطلحات موضوعية: |
*SUPERNOVAE, *LIGHT curves, *LUMINOSITY, *PHOTOMETRY, *HIGH temperatures, *SUPERNOVA remnants, *PHASE velocity |
| مستخلص: |
We present the photometry and spectroscopy of SN 2015an, a type II Supernova (SN) in IC 2367. The recombination phase of the SN lasts up to 120 d, with a decline rate of 1.24 mag/100d, higher than the typical SNe IIP. The SN exhibits bluer colours than most SNe II, indicating higher ejecta temperatures. The absolute V -band magnitude of SN 2015an at 50 d is −16.83 ± 0.04 mag, pretty typical for SNe II. However, the 56Ni mass yield, estimated from the tail V -band light curve to be 0.021 ± 0.010 M⊙, is comparatively low. The spectral properties of SN 2015an are atypical, with low H α expansion velocity and presence of high-velocity component of H α at early phases. Moreover, the continuum exhibits excess blue flux up to 50 d, which is interpreted as a progenitor metallicity effect. The high-velocity feature indicates ejecta-circumstellar material interaction at early phases. The semi-analytical modelling of the bolometric light curve yields a total ejected mass of 12 M⊙, a pre-SN radius of 388 R⊙ and explosion energy of 1.8 foe. [ABSTRACT FROM AUTHOR] |
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