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2015MNRAS.447.1370D - Mon. Not. R. Astron. Soc., 447, 1370-1382 (2015/February-3)

One-dimensional non-LTE time-dependent radiative transfer of an He-detonation model and the connection to faint and fast-decaying supernovae.


Abstract (from CDS):

We present non-LTE (non-Local-Thermodynamic-Equilibrium) time-dependent radiative transfer simulations for ejecta produced by the detonation of a helium shell at the surface of a low-mass carbon/oxygen white dwarf (WD). This mechanism is one possible origin for supernovae (SNe) with faint and fast-decaying light curves, such as.Ia SNe and Ca-rich transients. Our initial ejecta conditions at 1d are given by the 0.18 B explosion model COp45HEp2 of Waldman et al. The 0.2M ejecta initially contains 0.11M of He, 0.03M of Ca, and 0.03M of Ti. We obtain an ∼ 5d rise to a bolometric maximum of 3.59x1041erg/s, primarily powered by 48V decay. Multi-band light curves show distinct morphologies, with a rise to maximum magnitude (-14.3 to -16.7 mag) that varies between 3 to 9d from the U to the K bands. Near-IR light curves show no secondary maximum. Because of the presence of both Hei and Siii lines at early times we obtain a hybrid Type Ia/Ib classification. During the photospheric phase line blanketing is caused primarily by Tiii. At nebular times, the spectra show strong CaII lines in the optical (but no [Oi] 6300-6364Å emission), and Tiii in the near-IR. Overall, these results match qualitatively the very disparate properties of.Ia SNe and Ca-rich transients. Although the strong Tiii blanketing and red colours that we predict are rarely observed, they are seen, for example, in OGLE-2013- SN-079. Furthermore, we obtain a faster light-curve evolution than, for example, PTF10iuv, indicating an ejecta mass >0.2M. An alternate scenario may be the merger of two WDs, one or both composed of He.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): radiative transfer - supernovae: general - supernovae: individual: SN 2005E - supernovae: individual: PTF09dav - supernovae: individual: PTF10iuv - supernovae: individual: OGLE-2013-SN-079

Simbad objects: 9

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