Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts

Blondin, Stéphane, Dessart, Luc, Leibundgut, Bruno, Branch, David, Höflich, Peter, Tonry, John L., Matheson, Thomas, Foley, Ryan J., Chornock, Ryan, Filippenko, Alexei V., Sollerman, Jesper, Spyromilio, Jason, Kirshner, Robert P., Wood-Vasey, W. Michael, Clocchiatti, Alejandro, Aguilera, Claudio, Barris, Brian, Becker, Andrew C., Challis, Peter, Covarrubias, Ricardo, Davis, Tamara M., Garnavich, Peter, Hicken, Malcolm, Jha, Saurabh, Krisciunas, Kevin, Li, Weidong, Miceli, Anthony, Miknaitis, Gajus, Pignata, Giuliano, Prieto, Jose Luis, Rest, Armin, Riess, Adam G., Salvo, Maria Elena, Schmidt, Brian P., Smith, R. Chris, Stubbs, Christopher W. and Suntzeff, Nicholas B. (2006) Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts. The Astronomical Journal, 131 3: 1648-1666. doi:10.1086/498724

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Author Blondin, Stéphane
Dessart, Luc
Leibundgut, Bruno
Branch, David
Höflich, Peter
Tonry, John L.
Matheson, Thomas
Foley, Ryan J.
Chornock, Ryan
Filippenko, Alexei V.
Sollerman, Jesper
Spyromilio, Jason
Kirshner, Robert P.
Wood-Vasey, W. Michael
Clocchiatti, Alejandro
Aguilera, Claudio
Barris, Brian
Becker, Andrew C.
Challis, Peter
Covarrubias, Ricardo
Davis, Tamara M.
Garnavich, Peter
Hicken, Malcolm
Jha, Saurabh
Krisciunas, Kevin
Li, Weidong
Miceli, Anthony
Miknaitis, Gajus
Pignata, Giuliano
Prieto, Jose Luis
Rest, Armin
Riess, Adam G.
Salvo, Maria Elena
Schmidt, Brian P.
Smith, R. Chris
Stubbs, Christopher W.
Suntzeff, Nicholas B.
Title Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts
Journal name The Astronomical Journal   Check publisher's open access policy
ISSN 0004-6256
2330-9458
Publication date 2006-03
Sub-type Article (original research)
DOI 10.1086/498724
Open Access Status File (Publisher version)
Volume 131
Issue 3
Start page 1648
End page 1666
Total pages 19
Place of publication Washington, DC, United States
Publisher American Astronomical Society
Language eng
Abstract Using archival data of low-redshift (z < 0.01; Center for Astrophysics and SUSPECT databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16 < z < 0.64) SNe Ia, we study the "uniformity" of the spectroscopic properties of nearby and distant SNe Ia. We find no difference in the measurements we describe here. In this paper we base our analysis solely on line-profile morphology, focusing on measurements of the velocity location of maximum absorption (vabs) and peak emission (vpeak). Our measurement technique makes it easier to compare low and high signal-to-noise ratio observations. We also quantify the associated sources of error, assessing the effect of line blending with assistance from the parameterized code SYNOW. We find that the evolution of vabs and vpeak for our sample lines (Ca II λ3945, Si II λ6355, and S II λλ5454, 5640) is similar for both the low- and high-redshift samples. We find that vabs for the weak S II λλ5454, 5640 lines and vpeak for S II λ5454 can be used to identify fast-declining [Δm15(B) > 1.7] SNe Ia, which are also subluminous. In addition, we give the first direct evidence in two high-z SN Ia spectra of a double-absorption feature in Ca II λ3945, an event also observed, although infrequently, in low-redshift SN Ia spectra (6 out of 22 SNe Ia in our local sample). Moreover, echoing the recent studies of Dessart & Hillier in the context of Type II supernovae (SNe II), we see similar P Cygni line profiles in our large sample of SN Ia spectra. First, the magnitude of the velocity location at maximum profile absorption may underestimate that at the continuum photosphere, as observed, for example, in the optically thinner line S II λ5640. Second, we report for the first time the unambiguous and systematic intrinsic blueshift of peak emission of optical P Cygni line profiles in SN Ia spectra, by as much as 8000 km s-1. All the high-z SNe Ia analyzed in this paper were discovered and followed up by the ESSENCE collaboration and are now publicly available.
Keyword cosmology observations
line formation
line profiles
supernovae general
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mathematics and Physics
 
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