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  The Twins Embedding of Type Ia supernovae: I. The diversity of spectra at maximum light

Boone, K., Aldering, G., Antilogus, P., Aragon, C., Bailey, S., Baltay, C., et al. (2021). The Twins Embedding of Type Ia supernovae: I. The diversity of spectra at maximum light. The Astrophysical Journal, 912(1): 70. doi:10.3847/1538-4357/abec3c.

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 Creators:
Boone, K., Author
Aldering, G., Author
Antilogus, P., Author
Aragon, C., Author
Bailey, S., Author
Baltay, C., Author
Bongard, S., Author
Buton, C., Author
Copin, Y., Author
Dixon, S., Author
Fouchez, D., Author
Gangler, E., Author
Gupta, R., Author
Hayden, B., Author
Hillebrandt, W.1, Author           
Kim, A. G., Author
Kowalski, M., Author
Küsters, D., Author
Léget, P.-F., Author
Mondon, F., Author
Nordin, J., AuthorPain, R., AuthorPecontal, E., AuthorPereira, R., AuthorPerlmutter, S., AuthorPonder, K. A., AuthorRabinowitz, D., AuthorRigault, M., AuthorRubin, D., AuthorRunge, K., AuthorSaunders, C., AuthorSmadja, G., AuthorSuzuki, N., AuthorTao, C., AuthorTaubenberger, S.1, Author           Thomas, R. C., AuthorVincenzi, M., Author more..
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: We study the spectral diversity of Type Ia supernovae (SNe Ia) at maximum light using high signal-to-noise spectrophotometry of 173 SNe Ia from the Nearby Supernova Factory. We decompose the diversity of these spectra into different extrinsic and intrinsic components, and we construct a nonlinear parameterization of the intrinsic diversity of SNe Ia that preserves pairings of "twin" SNe Ia. We call this parameterization the "Twins Embedding." Our methodology naturally handles highly nonlinear variability in spectra, such as changes in the photosphere expansion velocity, and uses the full spectrum rather than being limited to specific spectral line strengths, ratios, or velocities. We find that the time evolution of SNe Ia near maximum light is remarkably similar, with 84.6% of the variance in common to all SNe Ia. After correcting for brightness and color, the intrinsic variability of SNe Ia is mostly restricted to specific spectral lines, and we find intrinsic dispersions as low as ~0.02 mag between 6600 and 7200 Å. With a nonlinear three-dimensional model plus one dimension for color, we can explain 89.2% of the intrinsic diversity in our sample of SNe Ia, which includes several different kinds of "peculiar" SNe Ia. A linear model requires seven dimensions to explain a comparable fraction of the intrinsic diversity. We show how a wide range of previously established indicators of diversity in SNe Ia can be recovered from the Twins Embedding. In a companion article, we discuss how these results can be applied to the standardization of SNe Ia for cosmology.

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 Dates: 2021-05-06
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/abec3c
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 912 (1) Sequence Number: 70 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3