J/ApJ/799/215 26 type II-Plateau supernovae parameters (Pejcha+, 2015)
A global model of the light curves and expansion velocities of
Type II-Plateau supernovae.
Pejcha O., Prieto J.L.
<Astrophys. J., 799, 215 (2015)>
=2015ApJ...799..215P 2015ApJ...799..215P
ADC_Keywords: Supernovae ; Stars, distances ; Reddening
Keywords: methods: statistical; stars: distances; supernovae: general
Abstract:
We present a new self-consistent and versatile method that derives
photospheric radius and temperature variations of Type II-Plateau
supernovae based on their expansion velocities and photometric
measurements. We apply the method to a sample of 26 well-observed,
nearby supernovae with published light curves and velocities. We
simultaneously fit ∼230 velocity and ∼6800mag measurements distributed
over 21 photometric passbands spanning wavelengths from 0.19 to
2.2µm. The light-curve differences among the Type II-Plateau
supernovae are well modeled by assuming different rates of
photospheric radius expansion, which we explain as different density
profiles of the ejecta, and we argue that steeper density profiles
result in flatter plateaus, if everything else remains unchanged. The
steep luminosity decline of Type II-Linear supernovae is due to fast
evolution of the photospheric temperature, which we verify with a
successful fit of SN 1980K. Eliminating the need for theoretical
supernova atmosphere models, we obtain self-consistent relative
distances, reddenings, and nickel masses fully accounting for all
internal model uncertainties and covariances. We use our global fit to
estimate the time evolution of any missing band tailored specifically
for each supernova, and we construct spectral energy distributions and
bolometric light curves. We produce bolometric corrections for all
filter combinations in our sample. We compare our model to the
theoretical dilution factors and find good agreement for the B and V
filters. Our results differ from the theory when the I, J, H, or K
bands are included. We investigate the reddening law toward our
supernovae and find reasonable agreement with standard R∼3.1 reddening
law in UBVRI bands. Results for other bands are inconclusive. We make
our fitting code publicly available.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 97 26 Table of results
table5.dat 34 24 Galaxy distances
table6.dat 36 21 Plateau luminosities and Nickel masses
table8.dat 75 135 Bolometric corrections
--------------------------------------------------------------------------------
See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/ApJ/799/208 : Type IIP supernovae from Pan-STARRS1 (Sanders+, 2015)
J/MNRAS/442/844 : Type II-P supernovae BVRI light curves (Faran+, 2014)
J/A+A/558/A131 : Model spectra of hot stars at the pre-SN stage (Groh+, 2013)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/MNRAS/433/1871 : UBVRI griz light curves of SN 2012aw (Bose+, 2013)
J/A+A/555/A142 : Spectra of 5 Type II supernovae (Inserra+, 2013)
J/other/NewA/20.30 : BVRI light curves of 3 SN (Munari+, 2013)
J/ApJ/708/661 : SDSS-II SN Survey: SN II-P standardization (D'Andrea+, 2010)
J/MNRAS/394/2266 : SN 2005cs one-year photometry (Pastorello+, 2009)
J/ApJ/673/999 : Supernova and host galaxies metallicities (Prieto+, 2008)
J/other/PZ/28.8 : SN 2004dj UBVRI light curves (Tsvetkov+, 2008)
J/MNRAS/372/1315 : UBVRI photometry of SN 2004et (Sahu+, 2006)
http://wiserep.weizmann.ac.il/ : Weizmann Interactive Supernova data REPository
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova identifier (YYYYaa)
11- 23 A13 --- Gal Host galaxy name
25- 29 A5 --- OName Other NGC number
31- 38 F8.2 d t0 [44539/56004] Explosion time t0 (JD-2400000)
40- 43 F4.2 d e_t0 [0/6] t0 uncertainty
45- 50 F6.2 d tP [60/140] Optically thick phase duration tP
(Plateau duration) (1)
52- 56 F5.2 d e_tP [0.1/13] tP uncertainty
58- 62 F5.2 d tW [0.1/27.3] Transition width tW (1)
64- 67 F4.2 d e_tW [0/5.3] tW uncertainty
69 A1 --- u_E(B-V) [~] uncertain E(B-V)
71- 75 F5.3 mag E(B-V) [0/1.6] E(B-V) reddening
77- 81 F5.3 mag e_E(B-V) [0/0.03]? E(B-V) uncertainty
83- 86 I4 --- Np [32/1302] Number of photometric measures
88- 89 I2 --- Nv [0/29] Number of velocity measures
91- 97 F7.1 --- chi2 [36.4/11485] Fit χ2
--------------------------------------------------------------------------------
Note (1): the model, described in Section 2, parametrizes the optical depth
τ as:
τ = (1-w)τthick + wτthin
1/w = 1+exp((t-t0-tP)/tW)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Gal Galaxy name (1)
15 A1 --- u_mu [=] =: fixed distance modulus (see section 2.1)
17- 22 F6.3 mag mu [27.8/35.7] Distance modulus
24- 28 F5.3 mag e_mu [0.04/0.7]? mu uncertainty
30- 34 F5.3 mag s_mu [0.1/0.7]? Uncertainty σ'_µ (2)
--------------------------------------------------------------------------------
Note (1): See text for comments on individual galaxies.
Note (2): Uncertainty σ'_µ obtained from a fit with the uncertainties
of the data rescaled to give H/Ndof=1
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova identifier (YYYYaa)
11 A1 --- u_logMNi [a] Uncertain Ni mass (2)
13- 17 F5.3 [Lsun] logLbol [7.5/9.1] log Bolometric luminosity at 50days
(Lbol(t0+50days))
19- 23 F5.3 [Lsun] e_logLbol [0.003/0.3] logLbol uncertainty
25- 30 F6.3 [Msun] logMNi [-3/-0.5] Ejected nickel mass MNi
32- 36 F5.3 [Msun] e_logMNi [0.003/0.3] logMNi uncertainty
--------------------------------------------------------------------------------
Note (2):
a = The absolute value of the nickel mass of SN 2006bp is uncertain due to
inadequately constrained temperature coefficients of the ROTSE bands.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Color Filter of the color index
13- 17 F5.2 mag mi [-4.4/0.4] Lower color value (1)
19- 22 F4.2 mag mj [0.1/5.3] Upper color value (1)
24- 31 F8.4 --- c0 The c0 coefficient (2)
33- 40 F8.4 --- c1 The c1 coefficient (2)
42- 50 F9.4 --- c2 The c2 coefficient (2)
52- 59 F8.4 --- c3 The c3 coefficient (2)
61- 69 F9.4 --- c4 The c4 coefficient (2)
71- 75 F5.3 mag sigma [0.001/0.2] Standard deviation about the fit (3)
--------------------------------------------------------------------------------
Note (1): The fit is valid over this range.
Note (2): Coefficients of a polynomial fit to the bolometric corrections,
BCj=Σ4k=0ck(mi-mj)k (Equ. 24), where
λj>λi.
Note (3): This only reflects how the fitting formula approximates BCj and
not the true uncertainty in determining BCj from the observations.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 22-Jun-2015