How much H and He is 'hidden' in SNe Ib/c? - I. Low-mass objects
2012 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 422, no 1, 70-88 p.Article in journal (Refereed) Published
H and He features in photospheric spectra have seldom been used to infer quantitatively the properties of Type IIb, Ib and Ic supernovae (SNe IIb, Ib and Ic) and their progenitor stars. Most radiative transfermodels ignored non-local thermodynamic equilibrium (NLTE) effects, which are extremely strong especially in the He-dominated zones. In this paper, a comprehensive set of model atmospheres for low-mass SNe IIb/Ib/Ic is presented. Long-standing questions, such as how much He can be contained in SNe Ic, where He lines are not seen, can thus be addressed. The state of H and He is computed in full NLTE, including the effect of heating by fast electrons. The models are constructed to represent iso-energetic explosions of the same stellar core with differently massive H/He envelopes on top. The synthetic spectra suggest that 0.06-0.14 M-circle dot of He and even smaller amounts of H suffice for optical lines to be present, unless ejecta asymmetries play a major role. This strongly supports the conjecture that low-mass SNe Ic originate from binaries where progenitor mass loss can be extremely efficient.
Place, publisher, year, edition, pages
2012. Vol. 422, no 1, 70-88 p.
radiative transfer, techniques: spectroscopic, supernovae: general, supernovae: individual: SN 2008ax, supernovae: individual: SN 1994I.
Physical Sciences Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-80071DOI: 10.1111/j.1365-2966.2012.20464.xISI: 000303912600026OAI: oai:DiVA.org:su-80071DiVA: diva2:557216