Supernova 2010as: The lowest-velocity member of a family of flat-velocity type IIb supernovae

Gastón Folatelli, Melina C. Bersten, Hanindyo Kuncarayakti, Felipe Olivares Estay, Joseph P. Anderson, Simon Holmbo, Keiichi Maeda, Nidia Morrell, Ken'Ichi Nomoto, Giuliano Pignata, Maximilian Stritzinger, Carlos Contreras, Francisco Förster, Mario Hamuy, Mark M. Phillips, José Luis Prieto, Stefano Valenti, Paulo Afonso, Konrad Altenmüller, Jonny ElliottJochen Greiner, Adria Updike, Joshua B. Haislip, Aaron P. Lacluyze, Justin P. Moore, Daniel E. Reichart

Resultado de la investigación: Contribución a una revistaArtículo

23 Citas (Scopus)

Resumen

We present extensive optical and near-infrared photometric and spectroscopic observations of the stripped-envelope supernova SN 2010as. Spectroscopic peculiarities such as initially weak helium features and low expansion velocities with a nearly flat evolution place this object in the small family of events previously identified as transitional Type Ib/c supernovae (SNe). There is ubiquitous evidence of hydrogen, albeit weak, in this family of SNe, indicating that they are in fact a peculiar kind of Type IIb SNe that we name "flat-velocity Type IIb. The flat-velocity evolution - which occurs at different levels between 6000 and 8000 km s-1 for different SNe - suggests the presence of a dense shell in the ejecta. Despite the spectroscopic similarities, these objects show surprisingly diverse luminosities. We discuss the possible physical or geometrical unification picture for such diversity. Using archival Hubble Space Telescope images, we associate SN 2010as with a massive cluster and derive a progenitor age of 6 Myr, assuming a single star-formation burst, which is compatible with a Wolf-Rayet progenitor. Our hydrodynamical modeling, on the contrary, indicates that the pre-explosion mass was relatively low, 4 M . The seeming contradiction between a young age and low pre-SN mass may be solved by a massive interacting binary progenitor.

Idioma originalInglés
Número de artículo7
PublicaciónAstrophysical Journal
Volumen792
N.º1
DOI
EstadoPublicada - 1 sep 2014

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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    Folatelli, G., Bersten, M. C., Kuncarayakti, H., Olivares Estay, F., Anderson, J. P., Holmbo, S., Maeda, K., Morrell, N., Nomoto, KI., Pignata, G., Stritzinger, M., Contreras, C., Förster, F., Hamuy, M., Phillips, M. M., Prieto, J. L., Valenti, S., Afonso, P., Altenmüller, K., ... Reichart, D. E. (2014). Supernova 2010as: The lowest-velocity member of a family of flat-velocity type IIb supernovae. Astrophysical Journal, 792(1), [7]. https://doi.org/10.1088/0004-637X/792/1/7