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  SN 2012dn from early to late times: 09dc-like supernovae reassessed

Taubenberger, S., Floers, A., Vogl, C., Kromer, M., Spyromilio, J., Aldering, G., et al. (2019). SN 2012dn from early to late times: 09dc-like supernovae reassessed. Monthly Notices of the Royal Astronomical Society, 488(4), 5473-5488. doi:10.1093/mnras/stz1977.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-D011-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D014-A
Genre: Journal Article

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 Creators:
Taubenberger, S.1, Author              
Floers, A.1, Author              
Vogl, C.1, Author              
Kromer, M., Author
Spyromilio, J., Author
Aldering, G., Author
Antilogus, P., Author
Bailey, S., Author
Baltay, C., Author
Bongard, S., Author
Boone, K., Author
Buton, C., Author
Chotard, N., Author
Copin, Y., Author
Dixon, S., Author
Fouchez, D., Author
Fransson, C., Author
Gangler, E., Author
Gupta, R. R., Author
Hachinger, S., Author
Hayden, B., AuthorHillebrandt, W.1, Author              Kim, A. G., AuthorKowalski, M., AuthorLeget, P.-F., AuthorLeibundgut, B., AuthorMazzali, P. A.1, Author              Noebauer, U. M.1, Author              Nordin, J., AuthorPain, R., AuthorPakmor, R.1, Author              Pecontal, E., AuthorPereira, R., AuthorPerlmutter, S., AuthorPonder, K. A., AuthorRabinowitz, D., AuthorRigault, M., AuthorRubin, D., AuthorRunge, K., AuthorSaunders, C., AuthorSmadja, G., AuthorTao, C., AuthorThomas, R. C., Author more..
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: As a candidate ‘super-Chandrasekhar’ or 09dc-like Type Ia supernova (SN Ia), SN 2012dn shares many characteristics with other members of this remarkable class of objects but lacks their extraordinary luminosity. Here, we present and discuss the most comprehensive optical data set of this SN to date, comprised of a densely sampled series of early-time spectra obtained within the Nearby Supernova Factory project, plus photometry and spectroscopy obtained at the Very Large Telescope about 1 yr after the explosion. The light curves, colour curves, spectral time series, and ejecta velocities of SN 2012dn are compared with those of other 09dc-like and normal SNe Ia, the overall variety within the class of 09dc-like SNe Ia is discussed, and new criteria for 09dc-likeness are proposed. Particular attention is directed to additional insight that the late-phase data provide. The nebular spectra show forbidden lines of oxygen and calcium, elements that are usually not seen in late-time spectra of SNe Ia, while the ionization state of the emitting iron plasma is low, pointing to low ejecta temperatures and high densities. The optical light curves are characterized by an enhanced fading starting ∼60 d after maximum and very low luminosities in the nebular phase, which is most readily explained by unusually early formation of clumpy dust in the ejecta. Taken together, these effects suggest a strongly perturbed ejecta density profile, which might lend support to the idea that 09dc-like characteristics arise from a brief episode of interaction with a hydrogen-deficient envelope during the first hours or days after the explosion.

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 Dates: 2019-07-24
 Publication Status: Published online
 Pages: -
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz1977
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 488 (4) Sequence Number: - Start / End Page: 5473 - 5488 Identifier: ISSN: 1365-2966
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150