J/MNRAS/425/1789 Berkeley supernova Ia program. I. (Silverman+, 2012)
Berkeley supernova Ia program.
I. Observations, data reduction and spectroscopic sample of 582 low-redshift
type Ia supernovae.
Silverman J.M., Foley R.J., Filippenko A.V., Ganeshalingam M., Barth A.J.,
Chornock R., Griffith C.V., Kong J.J., Lee N., Leonard D.C., Matheson T.,
Miller E.G., Steele T.N., Barris B.J., Bloom J.S., Cobb B.E., Coil A.L.,
Desroches L.-B., Gates E.L., Ho L.C., Jha S.W., Kandrashoff M.T., Li W.,
Mandel K.S., Modjaz M., Moore M.R., Mostardi R.E., Papenkova M.S., Park S.,
Perley D.A., Poznanski D., Reuter C.A., Scala J., Serduke F.J.D.,
Shields J.C., Swift B.J., Tonry J.L., Van Dyk S.D., Wang X., Wong D.S.
<Mon. Not. R. Astron. Soc., 425, 1789-1818 (2012)>
=2012MNRAS.425.1789S 2012MNRAS.425.1789S
ADC_Keywords: Supernovae ; Redshifts
Keywords: surveys - supernovae: general - cosmology: observations -
distance scale
Abstract:
In this first paper in a series, we present 1298 low-redshift (z≲0.2)
optical spectra of 582 Type Ia supernovae (SNe Ia) observed from 1989
to 2008 as part of the Berkeley Supernova Ia Program (BSNIP). 584
spectra of 199 SNe Ia have well-calibrated light curves with measured
distance moduli, and many of the spectra have been corrected for
host-galaxy contamination. Most of the data were obtained using the
Kast double spectrograph mounted on the Shane 3m telescope at Lick
Observatory and have a typical wavelength range of 3300-10400Å,
roughly twice as wide as spectra from most previously published data
sets. We present our observing and reduction procedures, and we
describe the resulting SN Database, which will be an online, public,
searchable data base containing all of our fully reduced spectra and
companion photometry. In addition, we discuss our spectral
classification scheme (using the SuperNova IDentification code, SNID;
Blondin & Tonry, 2007ApJ...666.1024B 2007ApJ...666.1024B), utilizing our newly constructed
set of SNID spectral templates.
Description:
In this paper, we present the low-redshift SN Ia spectral data set.
This sample consists of a total of 1298 spectra of 582 SNe Ia observed
from 1989 to the end of 2008.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 179 582 SNe Ia and host information
table2.dat 116 1298 SNe Ia spectral information
table5.dat 103 277 *SNID v7.0 Spectral Templates
table7.dat 104 1298 SNID classification information
observ.dat 24 121 Name of observers
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Note on table5.dat: All spectral templates are solely from our full dataset,
unless otherwise noted.
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See also:
J/MNRAS/425/1819 : Berkeley supernova Ia program. II. (Silverman+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova name (YYYYaa) (G1)
11- 17 A7 --- SNtype SN (sub)Type (G2)
19- 49 A31 --- Gal Host galaxy
51- 56 A6 --- MType Host morphology (3)
58- 62 I5 km/s cz ? Heliocentric redshift (4)
64- 68 F5.3 mag E(B-V) Milky Way reddening (5)
70- 79 A10 "YYYY/MM/DD" Date UT date of discovery
81-115 A35 --- Disc Discovery reference (6)
117-153 A37 --- Class Classification reference (6)
161-162 I2 --- Nsp Number of Spectra
164-169 F6.2 d Ep1 ? Epoch of first spectrum (d) (7)
171-176 F6.2 d Efl ? Epoch of last spectrum (d) (7)
178-179 I2 --- Ref ? JD Max Reference (8)
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Note (3): Host-galaxy morphology is taken from the NASA/IPAC Extragalactic
Database (NED).
Note (4): Heliocentric redshifts listed are from NED, except:
* host of SN 1991ay (2MASX J00471896+4032336): 1991IAUC.5366....1L 1991IAUC.5366....1L
* host of SN 1997fc (APMUKS(BJ) B045816.80-385931.0): 1998IAUC.6809Q...1F 1998IAUC.6809Q...1F
* host of SN 2003V (APMUKS(BJ) B030310.79-013550.9): 2003IAUC.8085....2F 2003IAUC.8085....2F
* the host of SN 2003av (NEAT J080132.34+024826.7): 2003IAUC.8085....2F 2003IAUC.8085....2F
* host of SN 2003fa (ARK 527): 2003IAUC.8146....2M 2003IAUC.8146....2M
* host of SN 2005X: 2005IAUC.8482....3F 2005IAUC.8482....3F
* host of SN 2005ag (2MASX J14564322+0919361):
Contreras et al. (2010, Cat. J/AJ/139/519),
* host of SN 2006mp (MCG +08-31-29): our own spectrum of the host galaxy
* host of SN 2007aj: 2007CBET..873....1Q 2007CBET..873....1Q
* host of SN 2007if: Scalzo et al. (2010ApJ...713.1073S 2010ApJ...713.1073S)
* host of SN 2007s1 (2MASX J00150006+1619596):
Bailey et al. (2009A&A...500L..17B 2009A&A...500L..17B)
* host of SN 2008s3: our own spectrum of the host galaxy
* host of SN 2008s5: from narrow, host-galaxy emission features
in our own spectra of the SN
* SN 2008s8: SuperNova Factory website (http://snfactory.lbl.gov/)
* host of SN 2008hk: 2008CBET.1581....2C 2008CBET.1581....2C
Note (5): The MW reddening toward each SN is derived from the dust maps of
Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S) and includes the corrections of
Peek & Graves (2010ApJ...719..415P 2010ApJ...719..415P).
Note (6): SNF = This information comes from the Nearby Supernova Factory (SNF)
website (http://snfactory.lbl.gov/, Aldering et al., 2002).
Note (7): Epochs of first and last spectrum are relative to B-band maximum
brightness in rest-frame days using the heliocentric redshift and date
of maximum reference presented in the table. For SNe with photometric
information and only one spectrum in our dataset, only a phase of first
spectrum is listed.
Note (8): References as follows:
1 = Tsvetkov et al., 1990A&A...236..133T 1990A&A...236..133T
2 = Ganeshalingam et al. 2010, Cat. J/ApJS/190/418
3 = Kimeridze and Tsvetkov, 1991AZh....68..341K 1991AZh....68..341K
4 = Ho et al. 2001PASP..113.1349H 2001PASP..113.1349H
5 = Hicken et al. 2009, Cat. J/ApJ/700/331
6 = Wang et al. in preparation
7 = Krisciunas et al. in preparation
8 = Li et al. 2003PASP..115..453L 2003PASP..115..453L
9 = Elias-Rosa et al. 2008, Cat. J/MNRAS/384/107
10 = Misra et al. 2008MNRAS.389..706M 2008MNRAS.389..706M
11 = Contreras et al. 2010, Cat. J/AJ/139/519
12 = Wood-Vasey et al. 2008, Cat. J/ApJ/689/377
13 = Prieto et al. 2007, arXiv
14 = Phillips et al. 2007PASP..119..360P 2007PASP..119..360P
15 = Zhang et al. 2010, Cat. J/PASP/122/1
16 = Scalzo et al. 2010ApJ...713.1073S 2010ApJ...713.1073S
17 = Voss et al. 2008Natur.451..802V 2008Natur.451..802V
18 = Foley et al. 2009AJ....138..376F 2009AJ....138..376F
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova name (YYYYaa) (G1)
10 A1 --- n_SN [*] unreliable spectrophotometry (2)
12- 25 A14 --- Date UT date of spectrum (YYYY/MM/DD.ddd) (3)
27- 35 F9.3 d MJD MJD of spectrum (4)
37- 42 F6.2 d Phase ? Phase of spectrum (5)
44- 45 I2 --- Inst Instrument (6)
47- 51 I5 0.1nm lam.min Minimum wavelength
53- 57 I5 0.1nm lam.max Maximum wavelength
59- 63 F5.2 0.1nm ResB ? Blue or average resolution if ResR blank (7)
64 A1 --- --- [/]
65- 69 F5.2 0.1nm ResR ? Red resolution (7)
71- 73 I3 deg PA [0/360]? Position angle (8)
75- 77 I3 deg plA ? Parallactic angle (9)
79- 82 F4.2 --- AirM ? Airmass of spectrum (10)
84- 87 F4.2 arcsec Seeing ? Seeing during observation (11)
89- 93 I5 s Texp ? Total exposure time
95-109 A15 --- Obs Observer(s) of spectrum (in observ.dat file)
111-112 I2 --- Who Person who reduced spectrum
(see observ.dat file)
115-116 I2 --- Corr Flux correction (12)
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Note (2): A '*' indicates that the observation has unreliable spectrophotometry
due to events external to normal telescope operation and data reduction.
See Spectrophotometry Section for more information.
Note (3): If not rounded to the whole day, UT day at the midpoint of the
observation.
Note (4): Modified JD (if not rounded to the whole day, modified JD at the
midpoint of the observation).
Note (5): Phases of spectra are in rest-frame days using the heliocentric
redshift and photometry reference presented in table1.
Note (6): Instrument code as follows:
1 = UV Schmidt (Shane 3m)
2 = Stover Spectrograph (Nickel 1m)
3 = Kast (Shane 3m)
4 = Palomar Double Spectrograph (Hale 5m at Palomar Observatory)
5 = LRIS (Keck 10m)
6 = ESI (Keck 10m)
7 = R.C. Spectrograph (Kitt Peak 4m)
8 = DEIMOS (Keck 10m)
9 = LDSS-3 (Clay Magellan II 6.5m)
Note (7): FWHM spectral resolution as measured from narrow sky emission lines.
If we were unable to accurately measure the sky lines, the average resolution
for that instrumental setup is displayed (see the Observations Section for
more information regarding our instrumental setups and their average
resolutions).
Note (8): Observed position angle during observation.
Note (9): Average parallactic angle (Filippenko, 1982PASP...94..715F 1982PASP...94..715F) during
the observation.
Note (10): Airmass at midpoint of exposure.
Note (11): Approximate atmospheric seeing as measured from the FWHM of the trace
of the SN. If we were unable to accurately measure the FWHM of the
trace, an estimate by the observers of the average seeing from that
night is displayed with only one or two significant figures.
Note (12): Negative values indicate that >5% of the corrected flux is negative.
0 = No correction
2 = Not parallactic, but galaxy subtracted, no contamination
3 = Not parallactic, but galaxy subtracted with contamination
4 = Parallactic and scaled
5 = Parallactic and galaxy subtracted, no contamination
6 = Parallactic and galaxy subtracted with contamination
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova name (YYYYaa) (G1)
12 I1 --- r_SN [3/4]? Origin of spectral template (1)
16- 23 A8 --- SNtype SN subtype (G2)
26 I1 --- Ver [1/3] Version of SNID spectral templates (2)
29-103 A75 d Ages Age(s) of the observations (3)
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Note (1): Note as follows:
3 = Spectral templates are from the original SNID v5.0 set of templates only.
4 = Spectral templates are from both our full dataset as well as the original
SNID v5.0 set of templates.
Note (2): Version of new SNID spectral templates when object was added:
1=v1.0, 2=v2.0-v2.5, 3=v3.0-v7.0
Note (3): Rest-frame SN age(s), rounded to nearest whole day, in days from
B-band maximum (for SNe Ia), from V-band maximum (for SNe Ib/c), or
from the estimated date of explosion (for SNe II). Ages of templates
from our dataset are calculated from the light curve references in
Table 1; ages from the original SNID v5.0 set of templates are from
Blondin & Tonry, 2007ApJ...666.1024B 2007ApJ...666.1024B. Adjacent ages are listed in
square brackets. Spectra whose age exceeds +50 days are grouped
together and the number of such spectra are noted in parentheses.
Many core-collapse SNe from our full spectral dataset lack age
information (though we require SNe Ia templates to have age information).
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova name (YYYYaa) (G1)
11- 15 A5 --- SNcl SNID main type (Ia, Ib, Ic, II or NotSN)
16- 24 A9 --- SNtype SNID subtype (G2)
26- 32 F7.4 --- z ? SNID redshift
34- 39 F6.4 --- e_z ? SNID redshift uncertainty
41- 45 F5.1 d tSNID ? SNID phase (-99.9 for no match) (2)
47- 50 F4.1 d e_tSNID ? SNID phase uncertainty (3)
52- 55 F4.1 --- rlap ? SNID rlap correlation parameter
57- 62 A6 --- Temp SNID best matching template
64- 71 A8 --- SNbtype SNID best matching template subtype (G2)
73- 79 F7.4 --- zT ? SNID best matching template redshift
81- 86 F6.4 --- e_zT ? SNID best matching template redshift error
88- 94 F7.2 d tT ? SNID best matching template age
(-99.9 when no match)
96-100 F5.2 d e_tT ? SNID best matching template age error
102-104 I3 --- Ng Number of good matches
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Note (2): Phases of spectra are in rest-frame days.
Note (3): Phase uncertainties of 0 imply that only one template was a "good"
match. The values (-1.0) in the original tables are blanked here.
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Byte-by-byte Description of file: observ.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Code Observer code
5- 24 A20 --- Name Observed name
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Global notes:
Note (G1): Supernovae non-conventional names:
SN 2007s1 = SNF20071021-000
SN 2008s1 = SNF20080514-002
SN 2008r3 = ROTSE3 J125642.7+273041
SN 2008s3 = SNF20080825-006
SN 2008s4 = SNF20080825-010
SN 2008s5 = SNF20080909-030
SN 2008s8 = SNF20080920-000
Note (G2): The SNID classes, detailed in the "Classification" section 5
of the paper, identify the subtypes:
Ia-norm = "normal" SN Ia spectrum
Ia-91T = SN 1991T-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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2013