J/A+A/437/789 Restframe I-band light curves of SN Ia (Nobili+, 2005)
Restframe I-band Hubble diagram for type Ia supernovae up to redshift z∼0.5.
Nobili S., Amanullah R., Garavini G., Goobar A., Lidman C., Stanishev V.,
Aldering G., Antilogus P., Astier P., Burns M.S., Conley A., Deustua S.E.,
Ellis R., Fabbro S., Fadeyev V., Folatelli G., Gibbons R., Goldhaber G.,
Groom D.E., Hook I., Howell D.A., Kim A.G., Knop R.A., Nugent P.E.,
Pain R., Perlmutter S., Quimby R., Raux J., Regnault N., Ruiz-Lapuente P.,
Sainton G., Schahmaneche K., Smith E., Spadafora A.L., Thomas R.C.,
Wang L., (the Supernova Cosmology Project)
<Astron. Astrophys., 437, 789-804 (2005)>
=2005A&A...437..789N 2005A&A...437..789N
ADC_Keywords: Supernovae ; Magnitudes ; Redshifts
Keywords: cosmology: observations - stars: supernovae: general
Abstract:
We present a novel technique for fitting restframe I-band light curves
on a data set of 42 type Ia supernovae (SNe Ia). Using the result of
the fit, we construct a Hubble diagram with 26 SNe from the subset at
0.01<z<0.1. Adding two SNe at z∼0.5 yields results consistent with a
flat Lambda-dominated "concordance universe''
(OmegaM,OmegaLambda)=(0.25, 0.75). For one of these, SN 2000fr,
new near infrared data are presented. The high redshift supernova NIR
data are also used to test for systematic effects in the use of SNe Ia
as distance estimators. A flat, Lambda=0, universe where the faintness
of supernovae at z∼0.5 is due to grey dust homogeneously distributed
in the intergalactic medium is disfavoured based on the high-z Hubble
diagram using this small data-set. However, the uncertainties are
large and no firm conclusion may be drawn. We explore the possibility
of setting limits on intergalactic dust based on B-I and B-V colour
measurements, and conclude that about 20 well measured SNe are needed
to give statistically significant results. We also show that the high
redshift restframe I-band data points are better fit by light curve
templates that show a prominent second peak, suggesting that they are
not intrinsically underluminous.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 89 42 *Results of the I-band light curve fit of 42
nearby supernovae
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Note on table2.dat: the intensity is modelled from the template function T as
I = I1.T(sI(t-t1)) + I2.T(sI(t-t2))
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See also:
II/189 : Magnitude Observations of Type I Supernovae (Cadonau+ 1990)
J/A+A/317/423 : Revised photometry of SNIa (Patat, 1997)
J/ApJ/607/665 : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004)
J/ApJ/613/200 : Hubble Higher z Supernova Search, HHZSS (Strolger+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- SN Supernova designation
9 I1 --- r_SN Reference for the data (1)
11- 15 F5.3 --- z Redshift
17- 21 F5.3 --- sI Stretch factor
23- 27 F5.3 --- e_sI rms uncertainty on sI
29- 34 F6.3 d t1 Time of the peak of the first template
36- 40 F5.3 d e_t1 rms uncertainty on t1
42- 47 F6.3 mag I1 Peak magnitude of the first template
49- 53 F5.3 mag e_I1 rms uncertainty on I1
55- 60 F6.3 d t2 Time of the peak of the second template
62- 66 F5.3 d e_t2 rms uncertainty on t2
68- 73 F6.3 mag I2 Peak magnitude of the second template
75- 79 F5.3 mag e_I2 rms uncertainty on I2
81- 86 F6.2 --- chi2 Fit chi2 value
88- 89 I2 --- N Number of points used in the fit (dof=N-5)
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Note (1): The data were taken from the following sources:
1 = Well et al., 1994AJ....108.2233W 1994AJ....108.2233W
2 = Richmond et al., 1995AJ....109.2121R 1995AJ....109.2121R
3 = Riess et al., 1999AJ....117..707R 1999AJ....117..707R
4 = Hamuy et al., 1996AJ....112.2408H 1996AJ....112.2408H
5 = Jha, 2002, Ph.D. Thesis, Harvard University
6 = Filippenko et al., 1992AJ....104.1543F 1992AJ....104.1543F,
Leibundgut et al., 1993AJ....105..301L 1993AJ....105..301L
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Aug-2006