onr:"swepub:oai:DiVA.org:su-158260"
Search: onr:"swepub:oai:DiVA.org:su-158260" > Understanding type ...
- 1 of 1
- Previous record
- Next record
- To hitlist
Understanding type Ia supernovae through their U-band spectra
- Nordin, J. (author)
- Aldering, G. (author)
- Antilogus, P. (author)
- show more...
- Aragon, C. (author)
- Bailey, S. (author)
- Baltay, C. (author)
- Barbary, K. (author)
- Bongard, S. (author)
- Boone, K. (author)
- Brinnel, V. (author)
- Buton, C. (author)
- Childress, M. (author)
- Chotard, N. (author)
- Copin, Y. (author)
- Dixon, S. (author)
- Fagrelius, P. (author)
- Fouchez, D. (author)
- Gangler, E. (author)
- Hayden, B. (author)
- Hillebrandt, W. (author)
- Kim, A. (author)
- Kowalski, M. (author)
- Kuesters, D. (author)
- Leget, P. -F. (author)
- Lombardo, S. (author)
- Lin, Q. (author)
- Pain, R. (author)
- Pecontal, E. (author)
- Pereira, R. (author)
- Perlmutter, S. (author)
- Rabinowitz, D. (author)
- Rigault, M. (author)
- Runge, K. (author)
- Rubin, D. (author)
- Saunders, C. (author)
- Smadja, G. (author)
- Sofiatti, C. (author)
- Suzuki, N. (author)
- Taubenberger, S. (author)
- Tao, C. (author)
- Thomas, R. C. (author)
- show less...
- (creator_code:org_t)
- 2018-06-15
- 2018
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 614
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Context. Observations of type Ia supernovae (SNe Ia) can be used to derive accurate cosmological distances through empirical standardization techniques. Despite this success neither the progenitors of SNe Ia nor the explosion process are fully understood. The U-band region has been less well observed for nearby SNe, due to technical challenges, but is the most readily accessible band for high-redshift SNe. Aims. Using spectrophotometry from the Nearby Supernova Factory, we study the origin and extent of U-band spectroscopic variations in SNe Ia and explore consequences for their standardization and the potential for providing new insights into the explosion process. Methods. We divide the U-band spectrum into four wavelength regions lambda(uNi), lambda(uTi), lambda(uSi) and lambda(uCa). Two of these span the Ca H&K lambda lambda 3934, 3969 complex. We employ spectral synthesis using SYNAPPS to associate the two bluer regions with Ni/Co and Ti. Results. The flux of the uTi feature is an extremely sensitive temperature/ luminosity indicator, standardizing the SN peak luminosity to 0.116 +/- 0.011 mag root mean square (RMS). A traditional SALT2. 4 fit on the same sample yields a 0.135 mag RMS. Standardization using uTi also reduces the difference in corrected magnitude between SNe originating from different host galaxy environments. Early U-band spectra can be used to probe the Ni + Co distribution in the ejecta, thus offering a rare window into the source of light curve power. The uCa flux further improves standardization, yielding a 0.086 +/- 0.010 mag RMS without the need to include an additional intrinsic dispersion to reach chi(2) /dof similar to 1. This reduction in RMS is partially driven by an improved standardization of Shallow Silicon and 91T-like SNe.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- supernovae: general
- cosmology: observations
- dark energy
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- Astronomy and Astrophysics (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Nordin, J.
- Aldering, G.
- Antilogus, P.
- Aragon, C.
- Bailey, S.
- Baltay, C.
- show more...
- Barbary, K.
- Bongard, S.
- Boone, K.
- Brinnel, V.
- Buton, C.
- Childress, M.
- Chotard, N.
- Copin, Y.
- Dixon, S.
- Fagrelius, P.
- Feindt, Ulrich
- Fouchez, D.
- Gangler, E.
- Hayden, B.
- Hillebrandt, W.
- Kim, A.
- Kowalski, M.
- Kuesters, D.
- Leget, P. -F.
- Lombardo, S.
- Lin, Q.
- Pain, R.
- Pecontal, E.
- Pereira, R.
- Perlmutter, S.
- Rabinowitz, D.
- Rigault, M.
- Runge, K.
- Rubin, D.
- Saunders, C.
- Smadja, G.
- Sofiatti, C.
- Suzuki, N.
- Taubenberger, S.
- Tao, C.
- Thomas, R. C.
- show less...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- Articles in the publication
- Astronomy and As ...
- By the university
- Stockholm University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
