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arXiv · 1506.06354

Observational Properties of Type Ib/c Supernova Progenitors in Binary Systems

Hyun-Jeong Kim·Sung-Chul Yoon·Bon-Chul Koo
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Abstract

In several recent observational studies on Type Ib/c supernovae (SNe Ib/c), the inferred ejecta masses have a peak value of 2.0 -- 4.0 $M_\odot$, in favor of the binary scenario for their progenitors rather than the Wolf-Rayet star scenario. To investigate the observational properties of relatively low-mass helium stars in binary systems as SN Ib/c progenitors, we constructed atmospheric models with the non-LTE radiative transfer code CMFGEN, using binary star evolution models. We find that these helium stars can be characterized by relatively narrow helium emission lines if the mass-loss rate during the final evolutionary phase is significantly enhanced as implied by many SN Ib/c observations. The optical brightness of helium star progenitors can be meaningfully enhanced with a strong wind for $M \gtrsim 4.4 M_\odot$, but hardly affected or slightly weakened for relatively low-mass of $\sim 3.0 M_\odot$, compared to the simple estimate using blackbody approximation. We further confirm the previous suggestion that the optical brightness would be generally higher for a less massive SN Ib/c progenitor. In good agreement with previous studies, our results indicate that the optical magnitudes and colors of the recently detected progenitor of the SN Ib iPTF13bvn can be well explained by a binary progenitor with a final helium star mass of about 3.0 -- 4.4 $M_\odot$.

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Hyun-Jeong Kim, Sung-Chul Yoon, Bon-Chul Koo. 2015-06-21. Observational Properties of Type Ib/c Supernova Progenitors in Binary Systems. https://doi.org/10.1088/0004-637x%2F809%2F2%2F131

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