J/AJ/133/403 Light curve of 11 type Ia supernovae (Garg+, 2007)
Light curves of type Ia supernovae from near the time of explosion.
Garg A., Stubbs C.W., Challis P., Wood-Vasey W.M., Blondin S., Huber M.E.,
Cook K., Nikolaev S., Rest A., Smith R.C., Olsen K., Aguilera C.,
Prieto J.L., Becker A., Miceli A., Miknaitis G., Clocchiatti A.,
Minniti D., Morelli L., Welch D.L.
<Astron. J., 133, 403-419 (2007)>
=2007AJ....133..403G 2007AJ....133..403G (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Supernovae
Keywords: Magellanic Clouds - supernovae: general - surveys
Abstract:
We present a set of 11 Type Ia supernova (SN Ia) light curves with
dense, premaximum sampling. These supernovae (SNe), in galaxies behind
the Large Magellanic Cloud (LMC), were discovered by the SuperMACHO
survey. The SNe span a redshift range of z=0.11-0.35. Our light
curves contain some of the earliest premaximum observations of SNe Ia
to date. We also give a functional model that describes the SN Ia
light-curve shape (in our VR band). Our function uses the "expanding
fireball" model of Goldhaber et al. (1998AAS...193.4713G 1998AAS...193.4713G) to describe
the rising light curve immediately after explosion but constrains it
to smoothly join the remainder of the light curve. We fit this model
to a composite observed VR-band light curve of three SNe between
redshifts of 0.135 and 0.165. These SNe have not been K-corrected or
adjusted to account for reddening. In this redshift range, the
observed VR band most closely matches the rest-frame V band. Using the
best fit to our functional description of the light curve, we find the
time between explosion and observed VR-band maximum to be
17.6±1.3(stat±0.07(sys) rest-frame days for a SN Ia with a VR-band
Δm10 of 0.52mag. For the redshifts sampled, the observed
VR-band time of maximum brightness should be the same as the
rest-frame V-band maximum to within 1.1 rest-frame days.
Description:
The light curves of the sources we report were obtained on the CTIO
Blanco 4m telescope during the 2004 season of the SuperMACHO survey.
Objects:
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RA (2000) DE Designation(s)
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04 55 22.3 -67 30 44 SM-2004-LMC-64 = SM 2004-LMC-64 (table2.dat)
05 19 42.7 -67 31 36 SM-2004-LMC-772 = SM 2004-LMC-772 (table3.dat)
05 59 13.2 -71 49 59 SM-2004-LMC-797 = SM 2004-LMC-797 (table4.dat)
05 47 05.1 -71 46 28 SM-2004-LMC-803 = SM 2004-LMC-803 (table5.dat)
04 56 31.6 -66 58 09 SM-2004-LMC-811 = SM 2004-LMC-811 (table6.dat)
05 21 19.8 -70 51 13 SM-2004-LMC-917 = SM 2004-LMC-917 (table7.dat)
05 11 48.9 -70 29 39 SM-2004-LMC-944 = SM 2004-LMC-944 (table8.dat)
04 53 09.3 -69 41 00 SM-2004-LMC-1002 = SM 2004-LMC-1002 (table9.dat)
06 01 36.2 -71 59 30 SM-2004-LMC-1052 = SM 2004-LMC-1052 (table10.dat)
05 35 30.1 -71 06 34 SM-2004-LMC-1060 = SM 2004-LMC-1060 (table11.dat)
05 37 13.7 -68 50 01 SM-2004-LMC-1102 = SM 2004-LMC-1102 (table12.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 11 SuperMACHO Supernovae 2004
lc/* . 11 Individual lightcurves
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Supernova name (SM-2004-LMC-NNNN)
17 A1 --- n_Name [a] Note on SM-LMC-2004-64 (1)
19- 20 I2 h RAh Right ascension (J2000.0)
22- 23 I2 min RAm Right ascension (J2000.0)
25- 30 F6.3 s RAs Right ascension (J2000.0)
32 A1 --- DE- Declination sign (J2000.0)
33- 34 I2 deg DEd Declination (J2000.0)
36- 37 I2 arcmin DEm Declination (J2000.0)
39- 43 F5.2 arcsec DEs Declination (J2000.0)
45- 49 F5.3 --- z Supernova redshift (2)
52- 56 F5.3 --- zGal ?=- Host galaxy redshift
58- 62 F5.1 d Rphase Rest-frame phase at which the first detection
with S/N>5 was made
64- 71 F8.2 d tmax MJD time of VR-band maximum
73- 77 F5.2 d e_tmax rms uncertainty on tmax
79- 84 F6.2 --- VRmax VR-band maximum (3)
86- 89 F4.2 --- e_VRmax rms uncertainty on VRmax
91- 96 F6.1 d Rphase0 Rest-frame phase of the last zero-flux
measurement (4)
98-108 A11 --- FileName Name of the table containing the light curve
in subdirectory lc
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Note (1): SM-LMC-2004-64 also has the IAU designation SN2004gb
Note (2): Determined by comparing its spectrum to a nearby SN
Note (3): The value of VRmax is in flux units normalized to a zero point of 25.
Note (4): Rest-frame phase of the last zero-flux measurement, corresponding
to difference flux with S/N<0.5, prior to the SN's detection.
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Modified Julian date
10- 14 F5.1 d Rphase Rest phase (1)
16- 22 F7.3 --- dFlux Observed VR-band difference flux (2)
24- 29 F6.3 --- e_dFlux Error in DFlux
31- 36 F6.3 --- dFrac Normalized difference flux (3)
38- 43 F6.3 --- e_dFrac Error in DFrac
45- 50 F6.2 --- S/N Significance of the difference flux measurement
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Note (1): Given in rest-frame days relative to observed VR-band maximum.
Note (2): At the position of the SN given in Table 1. The flux
is determined using the N(N-1)/2 method of Barris et al.
(2005AJ....130.2272B 2005AJ....130.2272B) and is normalized to a zeropoint of 25.
Note (3): Normalized by the maximum VR-band flux, VRmax, given in Table 1.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Dec-2008