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  SUGAR: An improved empirical model of Type Ia supernovae based on spectral features

Léget, P.-F., Gangler, E., Mondon, F., Aldering, G., Antilogus, P., Aragon, C., et al. (2020). SUGAR: An improved empirical model of Type Ia supernovae based on spectral features. Astronomy and Astrophysics, 636: A46. doi:10.1051/0004-6361/201834954.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A0AF-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A0B0-D
Genre: Journal Article

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 Creators:
Léget, P.-F., Author
Gangler, E., Author
Mondon, F., Author
Aldering, G., Author
Antilogus, P., Author
Aragon, C., Author
Bailey, S., Author
Baltay, C., Author
Barbary, K., Author
Bongard, S., Author
Boone, K., Author
Buton, C., Author
Chotard, N., Author
Copin, Y., Author
Dixon, S., Author
Fagrelius, P., Author
Feindt, U., Author
Fouchez, D., Author
Hayden, B., Author
Hillebrandt, W.1, Author              
Kim, A., AuthorKowalski, M., AuthorKuesters, D., AuthorLombardo, S., AuthorLin, Q., AuthorNordin, J., AuthorPain, R., AuthorPecontal, E., AuthorPereira, R., AuthorPerlmutter, S., AuthorPonder, K. A., AuthorPruzhinskaya, M. V., AuthorRabinowitz, D., AuthorRigault, M., AuthorRunge, K., AuthorRubin, D., AuthorSaunders, C., AuthorSays, L.-P., AuthorSmadja, G., AuthorSofiatti, C., AuthorSuzuki, N., AuthorTaubenberger, S.1, Author              Tao, C., AuthorThomas, R. C., Author more..
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: Context. Type Ia supernovae (SNe Ia) are widely used to measure the expansion of the Universe. Improving distance measurements of SNe Ia is one technique to better constrain the acceleration of expansion and determine its physical nature. Aims. This document develops a new SNe Ia spectral energy distribution (SED) model, called the SUpernova Generator And Reconstructor (SUGAR), which improves the spectral description of SNe Ia, and consequently could improve the distance measurements. Methods. This model was constructed from SNe Ia spectral properties and spectrophotometric data from the Nearby Supernova Factory collaboration. In a first step, a principal component analysis-like method was used on spectral features measured at maximum light, which allowed us to extract the intrinsic properties of SNe Ia. Next, the intrinsic properties were used to extract the average extinction curve. Third, an interpolation using Gaussian processes facilitated using data taken at different epochs during the lifetime of an SN Ia and then projecting the data on a fixed time grid. Finally, the three steps were combined to build the SED model as a function of time and wavelength. This is the SUGAR model. Results. The main advancement in SUGAR is the addition of two additional parameters to characterize SNe Ia variability. The first is tied to the properties of SNe Ia ejecta velocity and the second correlates with their calcium lines. The addition of these parameters, as well as the high quality of the Nearby Supernova Factory data, makes SUGAR an accurate and efficient model for describing the spectra of normal SNe Ia as they brighten and fade. Conclusions. The performance of this model makes it an excellent SED model for experiments like the Zwicky Transient Facility, the Large Synoptic Survey Telescope, or the Wide Field Infrared Survey Telescope.

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Language(s): eng - English
 Dates: 2020-04-17
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201834954
Other: LOCALID: 3240453
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 636 Sequence Number: A46 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1