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J/MNRAS/446/3895  The rising light curves of Type Ia supernovae   (Firth+, 2015)

The rising light curves of Type Ia supernovae. Firth R.E., Sullivan M., Gal-Yam A., Howell D.A., Maguire K., Nugent P., Piro A.L., Baltay C., Feindt U., Hadjiyksta E., McKinnon R., Ofek E., Rabinowitz D., Walker E.S. <Mon. Not. R. Astron. Soc., 446, 3895-3910 (2015)> =2015MNRAS.446.3895F (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Redshifts Keywords: supernovae: general Abstract: We present an analysis of the early, rising light curves of 18 Type Ia supernovae (SNe Ia) discovered by the Palomar Transient Factory and the La Silla-QUEST variability survey. We fit these early data flux using a simple power law (f(t)=αxtn) to determine the time of first light (t0), and hence the rise time (trise) from first light to peak luminosity, and the exponent of the power-law rise (n). We find a mean uncorrected rise time of 18.98±0.54 d, with individual supernova (SN) rise times ranging from 15.98 to 24.7 d. The exponent n shows significant departures from the simple `fireball model' of n=2 (or f(t)∝t2) usually assumed in the literature. With a mean value of n=2.44±0.13, our data also show significant diversity from event to event. This deviation has implications for the distribution of 56Ni throughout the SN ejecta, with a higher index suggesting a lesser degree of 56Ni mixing. The range of n found also confirms that the 56Ni distribution is not standard throughout the population of SNe Ia, in agreement with earlier work measuring such abundances through spectral modelling. We also show that the duration of the very early light curve, before the luminosity has reached half of its maximal value, does not correlate with the light-curve shape or stretch used to standardize SNe Ia in cosmological applications. This has implications for the cosmological fitting of SN Ia light curves. Description: Our data come from two local, rolling SN surveys. The first is the PTF (Law et al. 2009PASP..121.1395L; Rau et al. 2009PASP..121.1334R), a wide-field survey using the CFH12k camera mounted on the 48 inch Samuel Oschin telescope at Palomar Observatory (the P48 telescope). The survey operated primarily in an R-band filter (hereafter RP48), with occasional runs in a g filter (gP48) around new moon. The second survey is the LSQ (Baltay et al. 2013PASP..125..683B), a Southern Hemisphere variability survey using the 10 deg2 QUEST instrument (Baltay et al. 2007PASP..119.1278B) on the 1.0 m European Southern Observatory Schmidt telescope at La Silla, Chile. LSQ operates with a cadence of between 2 h and 2 d, using a broad gr filter (hereafter grLSQ). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sn.dat 40 18 List of SNe Ia in this catalog table2.dat 66 1170 Full SNe Ia sample data
See also: B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-) II/313 : Palomar Transient Factory (PTF) photometric catalog 1.0 (Ofek+, 2012) J/MNRAS/444/3258 : Velocities and EW of PTF SNe Ia (Maguire+, 2014) J/ApJS/219/13 : SNe Ia light curves for the LSQ-CSP sample (Walker+, 2015) Byte-by-byte Description of file: sn.dat
Bytes Format Units Label Explanations
1- 9 A9 --- SN SN identifier (PTF YYaaaa, LSQ YYaaa) 11- 12 I2 h RAh Simbad Hour of Right Ascension (J2000) 14- 15 I2 min RAm Simbad Minute of Right Ascension (J2000) 17- 21 F5.2 s RAs Simbad Second of Right Ascension (J2000) 23 A1 --- DE- Simbad Sign of the Declination (J2000) 24- 25 I2 deg DEd Simbad Degree of Declination (J2000) 27- 28 I2 arcmin DEm Simbad Arcminute of Declination (J2000) 30- 33 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000) 35- 40 A6 --- Filter Filter used for the observation
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- SN SN identifier (PTF YYaaaa, LSQ YYaaa) 11- 16 A6 --- Filter Filter used for the observation 18- 26 F9.3 d MJD Modified Julian Date of observation 28- 36 F9.1 ct Cts Observed counts 38- 44 F7.1 ct e_Cts Uncertainty in Cts 46- 49 F4.1 mag ZPmag [27.0] Zero-point AB magnitude 51- 59 F9.7 --- z Redshift 61- 66 F6.4 --- e_z Uncertainty in z
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 07-Nov-2017
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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