J/MNRAS/425/1819 Berkeley supernova Ia program. II. (Silverman+, 2012)
Berkeley supernova Ia program.
II. Initial analysis of spectra obtained near maximum brightness.
Silverman J.M., Kong J.J., Filippenko A.V.
<Mon. Not. R. Astron. Soc., 425, 1819-1888 (2012)>
=2012MNRAS.425.1819S 2012MNRAS.425.1819S
ADC_Keywords: Supernovae ; Spectroscopy ; Equivalent widths
Keywords: methods: data analysis - techniques: spectroscopic -
supernovae: general - cosmology: observations - distance scale
Abstract:
In this second paper in a series, we present measurements of spectral
features of 432 low-redshift (z<0.1) optical spectra of 261 Type Ia
supernovae (SNe Ia) within 20d of maximum brightness. The data were
obtained from 1989 to the end of 2008 as part of the Berkeley
Supernova Ia Program (BSNIP) and are presented in BSNIP I by Silverman
et al. (J/MNRAS/425/1789). We describe in detail our method of
automated, robust spectral feature definition and measurement which
expands upon similar previous studies. Using this procedure, we
attempt to measure expansion velocities, pseudo-equivalent widths
(pEWs), spectral feature depths and fluxes at the centre and endpoints
of each of nine major spectral feature complexes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 95 261 Summary of the spectral data set
tableb1.dat 110 281 Measured values for CaII H&K
tableb2.dat 110 188 Measured values for SiII λ4000
tableb3.dat 71 219 Measured values for MgII
tableb4.dat 71 313 Measured values for FeII
tableb5.dat 110 240 Measured values for SII 'W'
tableb6.dat 110 204 Measured values for SiII λ5972
tableb7.dat 110 366 Measured values for SiII λ6355
tableb8.dat 110 192 Measured values for OI triplet
tableb9.dat 110 301 Measured values for CaII near-IR triplet
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See also:
J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN SN name (YYYYaa) (G1)
10 A1 --- n_SN [fgh] Non-standard SN designation (G1)
12- 17 F6.2 d Phase1 Phase of spectrum#1 (G2)
18 A1 --- --- [,]
20- 25 F6.2 d Phase2 ? Phase of spectrum#2 (G2)
26 A1 --- --- [,]
28- 32 F5.2 d Phase3 ? Phase of spectrum#3 (G2)
33 A1 --- --- [,]
35- 39 F5.2 d Phase4 ? Phase of spectrum#4 (G2)
40 A1 --- --- [,]
J42- 46 F5.2 d Phase5 ? Phase of spectrum#5 (G2)
47 A1 --- --- [,]
49- 53 F5.2 d Phase6 ? Phase of spectrum#6 (G2)
54 A1 --- --- [,]
56- 60 F5.2 d Phase7 ? Phase of spectrum#7 (G2)
61 A1 --- --- [,]
63- 67 F5.2 d Phase8 ? Phase of spectrum#8 (G2)
68 A1 --- --- [,]
70- 74 F5.2 d Phase9 ? Phase of spectrum#9 (G2)
76- 82 A7 --- SNtype SN subtype (3)
84- 89 A6 --- Type1 Benetti type (4)
91- 92 A2 --- Type2 Branch type (5)
94- 95 A2 --- Type3 Wang type (6)
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Note (3): Spectral classification using the SuperNova IDentification code
(SNID; Blondin & Tonry, 2007ApJ...666.1024B 2007ApJ...666.1024B) taken from section 'ANALYSIS'
of Silverman et al. (2012, Cat. J/MNRAS/425/1789, Note (G2)):
Ia-norm = "normal" SN Ia spectrum
Ia-91T = SN 1991R-like spectrum
Ia-91bg = SN 1991bg-like spectrum
Ia-99aa = SN 1999aa-like spectrum
Ia-02cx = SN 2002cx-like spectrum
Ia-csm = SN interacting strongly with a circum-stellar medium
Ia-pec = other "peculiar" Ia
Ib-norm = "normal" SN Ib spectrum
Ic-broad = broad-lined SN Ic spectrum
II-pec = "peculiar" SN-II spectrum
IIn, IIb, IIP = normal, He, "plateau" SN-II types
Note (4): Classification based on the velocity gradient of the SiII λ6355
line (Benetti et al. 2005ApJ...623.1011B 2005ApJ...623.1011B):
HVG = high-velocity gradient
LVG = low-velocity gradient
FAINT = faint/underluminous
? = uncertain classification since light-curve shape information is
unavailable.
* = classification use the MLCS2K2 Δ parameter
(Jha et al. 2007, Cat. J/AJ/131/527) as a proxy for Δm15.
Note (5): Classification based on the (pseudo-)equivalent widths of the
SiII λ6355 and SiII λ5972 lines (Branch et al.,
2009PASP..121..238B 2009PASP..121..238B):
CN = core normal
BL = broad line
CL = cool
SS = shallow silicon
Note (6): Classification based on the velocity of the SiII λ6355 line
(Wang et al., 2009, Cat. J/ApJ/699/L139):
HV = high velocity
N = normal
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Byte-by-byte Description of file: tableb?.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN SN name (YYYYaa) (G1)
10 A1 --- n_SN [fgh] Non-standard SN designation (G1)
12- 17 F6.2 d Phase Phase of spectrum (G2)
19- 24 F6.2 10-16W/m2/nm Fluxb Flux at blue endpoint (10-14erg/cm2/s/Å)
27- 30 F4.2 10-16W/m2/nm e_Fluxb rms uncertainty on e_Fluxb
33- 38 F6.2 10-16W/m2/nm Fluxr Flux at red endpoint (10-14erg/cm2/s/Å)
41- 44 F4.2 10-16W/m2/nm e_Fluxr rms uncertainty on e_Fluxr
47- 51 F5.1 0.1nm pEW Pseudo-equivalent width
54- 57 F4.1 0.1nm e_pEW rms uncertainty on pEW
60- 65 F6.1 0.1nm DpEW Measured pEW minus the expected pEW at the
same epoch using our linear or
quadratic fit (3)
68- 71 F4.1 0.1nm e_DpEW rms uncertainty on DpEW
74- 78 F5.2 10+3km/s vexp ? Expansion velocity
81- 84 F4.2 10+3km/s e_vexp ? rms uncertainty on vexp
87- 91 F5.3 --- a [0/1]? Relative depth of the feature
94- 98 F5.3 --- e_a ? rms uncertainty on a
101-105 F5.1 0.1nm FWHM ? FWHM of the feature
108-110 F3.1 0.1nm e_FWHM ? rms uncertainty on FWHM
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Note (3): DpEW is the measured pEW minus the expected pEW at the same epoch
using our linear or quadratic fit (see Section 'Temporal evolution of pEWs'
for more information).
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Global notes:
Note (G1): Individual notes as follows:
f = Also known as SNF20071021-000
g = Also known as SNF20080514-002
h = Also known as SNF20080909-030
Note (G2): Phases of spectra are in rest-frame days using the heliocentric
redshift and photometry reference presented in table 1 of Silverman et al.
(2012, Cat. J/MNRAS/425/1789).
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History:
From electronic version of the journal
References:
Silverman et al., Paper I 2012MNRAS.425.1789S 2012MNRAS.425.1789S, Cat. J/MNRAS/425/1789
(End) Patricia Vannier [CDS] 01-Aug-2013