J/ApJ/874/32 Environment and hosts of Type Ia supernovae (Rose+, 2019)
Think global, act local: the influence of environment age and host mass on type
Ia supernova light curves.
Rose B.M., Garnavich P.M., Berg M.A.
<Astrophys. J., 874, 32 (2019)>
=2019ApJ...874...32R 2019ApJ...874...32R
ADC_Keywords: Supernovae; Photometry, SDSS; Redshifts; Stars, ages;
Stars, masses
Keywords: distance scale; galaxies: distances and redshifts; galaxies: general;
galaxies: photometry; galaxies: stellar content; supernovae: general
Abstract:
The reliability of Type Ia Supernovae (SNe Ia) may be limited by the
imprint of their galactic origins. To investigate the connection
between supernovae and their host characteristics, we developed an
improved method to estimate the stellar population age of the host as
well as the local environment around the site of the supernova. We use
a Bayesian method to estimate the star formation history and mass
weighted age of a supernova's environment by matching observed
spectral energy distributions to a synthesized stellar population.
Applying this age estimator to both the photometrically and
spectroscopically classified Sloan Digital Sky Survey II supernovae
(N=103), we find a 0.114±0.039mag "step" in the average Hubble
residual at a stellar age of ∼8Gyr; it is nearly twice the size of the
currently popular mass step. We then apply a principal component
analysis on the SALT2 parameters, host stellar mass, and local
environment age. We find that a new parameter, PC1, consisting of a
linear combination of stretch, host stellar mass, and local age, shows
a very significant (4.7σ) correlation with Hubble residuals.
There is a much broader range of PC1 values found in the Hubble flow
sample when compared with the Cepheid calibration galaxies. These
samples have mildly statistically different average PC1 values, at
∼2.5σ, resulting in at most a 1.3% reduction in the evaluation
of H0. Despite accounting for the highly significant trend in SN Ia
Hubble residuals, there remains a 9% discrepancy between the most
recent precision estimates of H0 using SN Ia and the CMB.
Description:
We selected both spectroscopic and photometric classified Type Ia
Supernova (SN Ia) that passed cosmology cuts as described and released
by Campbell+ (C13; 2013, J/ApJ/763/88). For our analysis, a few
additional cuts were applied (see Section 2).
We use the C13 supernova sample to provide light-curve properties and
Hubble residual information. We use the Malmquist bias corrected
distances derived from the best-fit cosmology (H0=73.8km/s/Mpc,
ΩM=0.24, and ΩΛ=0.76).
The photometry of the environment around the site of the supernovae
are taken from the "Scene Modeling" method described in
Holtzman+ (2008, J/AJ/136/2306).
Images of the large galaxies were downloaded from the SDSS-DR12 and
individual apertures were designed to capture 90% of the combined
light in all the filters (see Section 2.3).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 103 Local environment data for C13
(Campbell+ 2013, J/ApJ/763/88) SNIa
table2.dat 70 76 Data used for validation with
Gupta+ (2011, J/ApJ/740/92) ages
table3.dat 60 103 Global host data for
Campbell+ (2013, J/ApJ/763/88) SNIa
table7.dat 33 103 Results of median age, stellar mass, and PC1
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See also:
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/AJ/136/2306 : SDSS-II Supernova survey, 2005 (Holtzman+, 2008)
J/AJ/135/348 : SDSS-II SNe survey: search and follow-up (Sako+, 2008)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/ApJ/722/566 : Host galaxies of SNIa in SDSS-II SN survey (Lampeitl+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
J/ApJ/740/92 : SN.Ia host galaxies properties (Gupta+, 2011)
J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)
J/ApJ/763/88 : SDSS-II SNe Ia cosmological analysis (Campbell+, 2013)
J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)
J/A+A/568/A22 : Joint analysis of the SDSS-II and SNLS SNIa (Betoule+, 2014)
J/ApJ/812/31 : Local Star Formation effects on type Ia SNe (Jones+, 2015)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/ApJ/837/120 : Lick Observatory Supernova Search revisited (Graur+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- SNID [762/22075] SDSS-II SN identifier
7- 14 F8.6 --- z [0.045/0.2] Spectroscopic redshift
of the host galaxy from C13
16- 19 F4.2 10-5 e_z [1/9.5] Uncertainty in z
21- 24 F4.1 mag umag [21.2/25.5] SDSS u band (AB) magnitude
26- 29 F4.1 mag gmag [19.5/25.3] SDSS g band (AB) magnitude
31- 34 F4.1 mag rmag [18.6/24.2] SDSS r band (AB) magnitude
36- 39 F4.1 mag imag [18.3/23.9] SDSS i band (AB) magnitude
41- 44 F4.1 mag zmag [18.0/24.1] SDSS z band (AB) magnitude
46- 49 F4.2 mag e_umag [0.04/1.5] Uncertainty in umag
51- 54 F4.2 mag e_gmag [0/0.4] Uncertainty in gmag
56- 59 F4.2 mag e_rmag [0/0.15] Uncertainty in rmag
61- 64 F4.2 mag e_imag [0/0.3] Uncertainty in imag
66- 69 F4.2 mag e_zmag [0/0.8] Uncertainty in zmag
71- 75 F5.2 mag HR [-0.5/0.5] Best-fit linear regression value
77- 80 F4.2 mag e_HR [0.06/0.13] Uncertainty in HR
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- SNID [1371/20821] SDSS-II SN identifier
7- 11 F5.2 mag umag [17.6/26.2] Host galaxy SDSS u band
(AB) magnitude
13- 17 F5.2 mag gmag [15.8/23.3] Host galaxy SDSS g band
(AB) magnitude
19- 23 F5.2 mag rmag [15/22.3] Host galaxy SDSS r band
(AB) magnitude
25- 29 F5.2 mag imag [14.6/22.1] Host galaxy SDSS i band
(AB) magnitude
31- 35 F5.2 mag zmag [14.4/22.2] Host galaxy SDSS z band
(AB) magnitude
37- 41 F5.3 mag e_umag [0.02/1.4] Uncertainty in umag
43- 46 F4.2 mag e_gmag [0.01/0.3] Uncertainty in gmag
48- 51 F4.2 mag e_rmag [0.01/0.16] Uncertainty in rmag
53- 56 F4.2 mag e_imag [0.01/0.2] Uncertainty in imag
58- 61 F4.2 mag e_zmag [0.01/0.8] Uncertainty in zmag
63- 70 F8.6 --- z [0.04/0.2] Host galaxy spectroscopic redshift
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- SNID [762/22075] SDSS-II SN identifier
7- 11 F5.2 mag umag [17.5/25] Host galaxy SDSS u band
(AB) magnitude
13- 17 F5.2 mag gmag [15.8/25.1] Host galaxy SDSS g band
(AB) magnitude
19- 23 F5.2 mag rmag [15.1/23.7] Host galaxy SDSS r band
(AB) magnitude
25- 29 F5.2 mag imag [14.7/22.1] Host galaxy SDSS i band
(AB) magnitude
31- 35 F5.2 mag zmag [14.4/22] Host galaxy SDSS z band
(AB) magnitude
37- 40 F4.2 mag e_umag [0.02/0.9] Uncertainty in umag
42- 45 F4.2 mag e_gmag [0/0.7] Uncertainty in gmag
47- 50 F4.2 mag e_rmag [0/0.4] Uncertainty in rmag
52- 55 F4.2 mag e_imag [0/0.2] Uncertainty in imag
57- 60 F4.2 mag e_zmag [0.01/0.6] Uncertainty in zmag
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- SNID [762/22075] SDSS-II SN identifier
7- 9 F3.1 [Gyr] logAl [1.6/9.7] log median local age
11- 13 F3.1 [Gyr] e_logAl [0.4/4.5] Uncertainty in logAl
15- 18 F4.1 [Gyr] logAg [1.2/10.7] log median global age
20- 22 F3.1 [Gyr] e_logAg [0.3/4.4] Uncertainty in logAg
24- 27 F4.1 [Msun] logM [7.5/11.4] log stellar mass (1)
29- 33 F5.2 --- PC1 [-2.72/3] First principle component (2)
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Note (1): Stellar masses have a 0.3dex uncertainty.
Note (2): PC1 was calculated with local environment ages,
PC1=0.56x'1-0.10c'-0.54m'-0.63a' (Equation 11);
See Section 7.4 on Principal Component Analysis (PCA).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Aug-2020