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J/ApJ/699/L139           Spectral parameters of SNe Ia             (Wang+, 2009)

Improved distances to type Ia supernovae with two spectroscopic subclasses. Wang X., Filippenko A.V., Ganeshalingam M., Li W., Silverman J.M., Wang L., Chornock R., Foley R.J., Gates E.L., Macomber B., Serduke F.J.D., Steele T.N., Wong D.S. <Astrophys. J., 699, L139-L143 (2009)> =2009ApJ...699L.139W
ADC_Keywords: Supernovae ; Magnitudes Keywords: cosmology: observations - distance scale - dust, extinction - supernovae: general Abstract: We study the observables of 158 relatively normal Type Ia supernovae (SNe Ia) by dividing them into two groups in terms of the expansion velocity inferred from the absorption minimum of the SiIIλ6355 line in their spectra near B-band maximum brightness. One group ("Normal") consists of normal SNe Ia populating a narrow strip in the SiII velocity distribution, with an average expansion velocity <ν≥10600±400km/s near B maximum; the other group ("HV") consists of objects with higher velocities, ν≳11800km/s. Compared with the Normal group, the HV one shows a narrower distribution in both the peak luminosity and the luminosity decline rate Δm15. In particular, their B-V colors at maximum brightness are found to be on average redder by ∼0.1mag, suggesting that they either are associated with dusty environments or have intrinsically red B-V colors. The HV SNe Ia are also found to prefer a lower extinction ratio RV∼1.6 (versus ∼2.4 for the Normal ones). Applying such an absorption-correction dichotomy to SNe Ia of these two groups remarkably reduces the dispersion in their peak luminosity from 0.178mag to only 0.125mag. Description: Spectral data for the 158 SNe Ia sample are primarily from Matheson et al. (2008, Cat. J/AJ/135/1598) and our own database (J. M. Silverman et al. 2009, in prep; 2011AAS...21732405S). For a few objects, the spectral parameters were also taken from Benetti et al. 2005ApJ...623.1011B, Branch et al. (2009PASP..121..238B), and the IAU Circulars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 68 158 Observed parameters of the SN Ia sample
See also: B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-) J/ApJ/607/665 : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004) J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006) J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007) J/MNRAS/389/1871 : Type Ia supernovae candidates from SDSS (Horesh+, 2008) J/ApJ/673/981 : Type Ia supernova rates with HST ACS (Kuznetsova+, 2008) J/AJ/135/1598 : Optical spectroscopy of type Ia supernovae (Matheson+, 2008) J/A+A/477/717 : Spectroscopy of Type Ia supernovae (Bronder+, 2008) J/AJ/136/2306 : SDSS-II SN survey, 2005 (Holtzman+, 2008) J/A+A/500/L17 : Spectral flux ratio of SN Ia (Bailey+, 2009) J/A+A/507/85 : ESO/VLT 3rd year type Ia supernova data set (Balland+, 2009) J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 A6 --- SN Supernova identification (YYYYaa) 8 A1 --- f_SN [d] SN-Ia with Cepheid distance 10- 14 I5 km/s cz Recession velocity (2) 16- 21 F6.2 mag VMAG Absolute V band magnitude at maximum 23- 26 F4.2 mag e_VMAG The 1σ uncertainty in VMAG 28- 31 F4.2 mag Dm15 Luminosity decline rate Δm_15_ (3) 33- 36 F4.2 mag e_Dm15 The 1σ uncertainty in Delm15 38- 42 F5.2 mag B-V The (B-V) color index at maximum 44- 47 F4.2 mag e_B-V The 1σ uncertainty in B-V 49- 53 F5.2 mag E(B-V) Host galaxy (B-V) color excess 55- 58 F4.2 mag e_E(B-V) Uncertainty in E(B-V) 60- 64 F5.1 --- TType ? RC3 host galaxy T morphology 65 A1 --- f_TType [?] Uncertainty flag on Morph 67- 68 A2 --- Type SN type ("HV" or "N" for normal) (4)
Note (2): Distances to the SNe are computed by using the redshifts of their host galaxies, in the reference frame of the 3K cosmic microwave background radiation for samples at redshift z≳0.01 or corrected to a self-consistent Virgocentric infall of 220km/s for closer ones, with a Hubble constant H0=70.5 km/s/Mpc (Komatsu et al. 2009ApJS..180..330K). A peculiar-velocity component of 300km/s is included in the distance-modulus uncertainties. Cepheid distances are adopted whenever available (see Wang X. et al. 2006, Cat. J/ApJ/645/488 and references therein). Note (3): Value has been corrected for the reddening effect (Phillips et al. 1999AJ....118.1766P). Note (4): SN Ia sample is divided into "Normal" and "HV" groups according to the observed velocity of SiIIλ6355. N = "Normal" group which consists of normal SNe Ia populating a narrow strip in the SiII velocity distribution, with an average expansion velocity <ν≥10600±400km/s near B maximum; HV = the other group which consists of objects with higher velocities, ν≳11800km/s.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Jul-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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