Type Ia Supernova Discoveries atz> 1 from theHubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution

AbstractWe compare two Type Ia supernova samples that are drawn from a spectroscopically confirmed Type Ia supernova sample: a host-selected sample in which SNe Ia are restricted to those that have a spectroscopic redshift from the host; and a broader, more traditional sample in which the redshift could come from either the SN or the host. The host-selected sample is representative of SN samples that will use the redshift of the host to infer the SN redshift, long after the SN has faded from view. We find that SNe Ia that are selected on the availability of a redshift from the host differ from SNe Ia that are from the broader sample. The former tend to be redder, have narrower light curves, live in more massive hosts, and tend to be at lower redshifts. We find that constraints on the equation of state of dark energy, w, and the matter density, ΩM, remain consistent between these two types of samples. Our results are important for ongoing and future supernova surveys, which unlike previous supernova surveys, will have limited real-time follow-up to spectroscopically classify the SNe they discover. Most of the redshifts in these surveys will come from the hosts.

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Progenitor constraints on the Type-Ia supernova SN2011fe from pre-explosion Hubble Space Telescope He ii narrow-band observations

Monthly Notices of the Royal Astronomical Society Letters ◽

10.1093/mnrasl/slu052 ◽

2014 ◽

Vol 442 (1) ◽

pp. L28-L32 ◽

Cited By ~ 27

Author(s):

Or Graur ◽

Dan Maoz ◽

Michael M. Shara

Keyword(s):

Narrow Band ◽

Hubble Space Telescope ◽

Space Telescope ◽

Type Ia Supernova ◽

Type Ia

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Hubble Space Telescope spectra of the Type Ia supernova SN 2011fe: a tail of low-density, high-velocity material with Z < Z⊙

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stu077 ◽

2014 ◽

Vol 439 (2) ◽

pp. 1959-1979 ◽

Cited By ~ 109

Author(s):

P. A. Mazzali ◽

M. Sullivan ◽

S. Hachinger ◽

R. S. Ellis ◽

P. E. Nugent ◽

...

Keyword(s):

High Velocity ◽

Hubble Space Telescope ◽

Low Density ◽

Space Telescope ◽

Type Ia Supernova ◽

Type Ia

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Consequences for some dark energy candidates from the type Ia supernova SN 1997ff

Monthly Notices of the Royal Astronomical Society ◽

10.1046/j.1365-8711.2002.05253.x ◽

2002 ◽

Vol 331 (3) ◽

pp. 776-784 ◽

Cited By ~ 40

Author(s):

R. G. Vishwakarma

Keyword(s):

Dark Energy ◽

Type Ia Supernova ◽

Type Ia

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THE EFFECT OF DIFFERENT OBSERVATIONAL DATA IN CONSTRAINING COSMOLOGICAL PARAMETERS

International Journal of Modern Physics Conference Series ◽

10.1142/s201019451200579x ◽

2012 ◽

Vol 10 ◽

pp. 85-94 ◽

Cited By ~ 5

Author(s):

YUNGUI GONG ◽

QING GAO ◽

ZONG-HONG ZHU

Keyword(s):

Dark Energy ◽

Equation Of State ◽

Observational Data ◽

Cosmological Parameters ◽

State Parameter ◽

Wilkinson Microwave Anisotropy Probe ◽

Model Parameters ◽

Type Ia Supernova ◽

Equation Of State Parameter ◽

Type Ia

We use the SNLS3 compilation of 472 type Ia supernova data, the baryon acoustic oscillation measurement of distance, and the cosmic microwave background radiation data from the seven year Wilkinson Microwave Anisotropy Probe to study the effect of their different combinations on the fittings of cosmological parameters. Neither BAO nor WMAP7 data alone gives good constraint on the equation of state parameter of dark energy, but both WMAP7 data and BAO data help type Ia supernova data break the degeneracies among the model parameters, hence tighten the constraint on the variation of equation of state parameter wa, and WMAP7 data does the job a little better. Although BAO and WMAP7 data provide reasonably good constraints on Ωm and Ωk, it is not able to constrain the dynamics of dark energy, we need SNe Ia data to probe the property of dark energy, especially the variation of the equation of state parameter of dark energy. For the SNLS SNe Ia data, the nuisance parameters α and β are consistent for all different combinations of the above data. Their impacts on the fittings of cosmological parameters are minimal. ΛCDM model is consistent with current observational data.

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