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Growing evidence that SNe Iax are not a one-parameter family: the case of PS1-12bwh
- Source :
- Magee, M R, Kotak, R, Sim, S A, Wright, D, Smartt, S J, Berger, E, Chornock, R, Foley, R J, Howell, A, Kaiser, N, Magnier, E A, Wainscot, R & Waters, C 2017, ' Growing evidence that SNe Iax are not a one-parameter family: the case of PS1-12bwh ', Astronomy and Astrophysics, vol. 601, A62 . https://doi.org/10.1051/0004-6361/201629643
- Publication Year :
- 2017
-
Abstract
- In this study, we present observations of a type Iax supernova, PS1-12bwh, discovered during the Pan-STARRS1 3$\pi$-survey. Our analysis was driven by previously unseen pre-maximum, spectroscopic heterogeneity. While the light curve and post-maximum spectra of PS1-12bwh are virtually identical to those of the well-studied type Iax supernova, SN 2005hk, the $-$2 day spectrum of PS1-12bwh does not resemble SN 2005hk at a comparable epoch; instead, we found it to match a spectrum of SN 2005hk taken over a week earlier ($-$12 day). We are able to rule out the cause as being incorrect phasing, and argue that it is not consistent with orientation effects predicted by existing explosion simulations. To investigate the potential source of this difference, we performed radiative transfer modelling of both supernovae. We found that the pre-maximum spectrum of PS1-12bwh is well matched by a synthetic spectrum generated from a model with a lower density in the high velocity ($\gtrsim$6000 km~s$^{-1}$) ejecta than SN 2005hk. The observed differences between SN 2005hk and PS1-12bwh may therefore be attributed primarily to differences in the high velocity ejecta alone, while comparable densities for the lower velocity ejecta would explain the nearly identical post-maximum spectra. These two supernovae further highlight the diversity within the SNe Iax class, as well as the challenges in spectroscopically identifying and phasing these objects, especially at early epochs.<br />Comment: 12 pages, 8 figures. Accepted for publication in Astronomy & Astrophysics
- Subjects :
- Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
010308 nuclear & particles physics
Lower velocity
Synthetic spectrum
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Type (model theory)
Light curve
01 natural sciences
Spectral line
Supernova
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
0103 physical sciences
Radiative transfer
Ejecta
Astrophysics - High Energy Astrophysical Phenomena
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Magee, M R, Kotak, R, Sim, S A, Wright, D, Smartt, S J, Berger, E, Chornock, R, Foley, R J, Howell, A, Kaiser, N, Magnier, E A, Wainscot, R & Waters, C 2017, ' Growing evidence that SNe Iax are not a one-parameter family: the case of PS1-12bwh ', Astronomy and Astrophysics, vol. 601, A62 . https://doi.org/10.1051/0004-6361/201629643
- Accession number :
- edsair.doi.dedup.....95abab9871ee8651ce78e0373a349797