J/MNRAS/517/L132 Properties of 77 SNe Ia (Karapetyan, 2022)
Constraining Type Ia supernovae via their distances from spiral arms.
Karapetyan A.G.
<Mon. Not. R. Astron. Soc., 517, L132-L137 (2022)>
=2022MNRAS.517L.132K 2022MNRAS.517L.132K (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Galaxies, nearby ; Stars, distances ; Optical
Keywords: supernovae: individual: Type Ia - galaxies: spiral -
galaxies: star formation - galaxies: stellar content
Abstract:
We present an analysis of the distribution of 77 supernovae (SNe) Ia
relative to spiral arms of their Sab-Scd host galaxies, using our
original measurements of the SN distances from the nearby arms, and
study their light-curve decline rates (Δm15). For the galaxies
with prominent spiral arms, we show that the Δm15 values of
SNe Ia, which are located on the arms, are typically smaller (slower
declining) than those of interarm SNe Ia (faster declining). We
demonstrate that the SN Ia distances from the spiral arms and their
galactocentric radii are correlated: before and after the average
corotation radius, SNe Ia are located near the inner and outer edges
(shock fronts) of spiral arms, respectively. For the first time, we
find a significant correlation between the Δm15 values and SN
distances from the shock fronts of the arms (progenitor birthplace),
which is explained in the frameworks of sub-Chandrasekhar-mass white
dwarf explosion models and density wave theory, where, respectively,
the Δm15 parameter and SN distance from the shock front are
appropriate progenitor population age (lifetime) indicators.
Description:
Table contains new database of 77 individual SNe Ia (SN name, arm and
interarm SN definition, SN distance from the g-band surface brightness
peak of the nearest spiral arm [normalized to the corresponding
semiwidth of the arm], SN distance from the shock front of spiral arm
[normalized to the width of the arm], and deprojected and
R25-normalized galactocentric distance of SN), while
Hakobyan et al., 2020, Cat. J/MNRAS/499/1424 contains data on the
spectroscopic subclasses and B-band Δm15 of the events, as
well as data on host galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea3.dat 34 77 Properties of 77 SNe Ia
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See also:
J/MNRAS/499/1424 : Properties of 407 SNe and their 394 hosts (Hakobyan+, 2020)
Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SN Supernova (SN) name
9- 16 A8 --- IntAr Arm and interarm SN definition
18- 22 F5.3 --- dtild SN distance from the peak of the spiral arm,
normalized to the corresponding semiwidth
of the arm
24- 28 F5.3 --- Dtild SN distance from the shock front of the arm,
normalized to the width of the arm
30- 34 F5.3 --- rtild Deprojected and R25-normalized
galactocentric distance of SN
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Acknowledgements:
Arpine Karapetyan, a.karapetyan(at)yerphi.am
(End) Arpine Karapetyan [YerPHI], Patricia Vannier [CDS] 08-Dec-2022