J/MNRAS/520/L21 Data on 197 SNe Ia and their 196 hosts (Barkhudaryan, 2023)
Constraining Type Ia supernovae through their heights in edge-on galaxies.
Barkhudaryan L.V.
<Mon. Not. R. Astron. Soc. 520, L21 (2023)>
=2023MNRAS.520L..21B 2023MNRAS.520L..21B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Galaxies, nearby ; Stars, distances ; Optical
Keywords: supernovae: individual: Type Ia - galaxies: disc -
galaxies: stellar content - galaxies: structure
Abstract:
In this Letter, using classified 197 supernovae (SNe) Ia, we perform
an analysis of their height distributions from the disc in edge-on
spirals and investigate their light-curve (LC) decline rates
(Δm15). We demonstrate, for the first time, that 91T- and
91bg-like subclasses of SNe Ia are distributed differently toward the
plane of their host disc. The average height from the disc and its
comparison with scales of thin/thick disc components gives a
possibility to roughly estimate the SNe Ia progenitor ages: 91T-like
events, being at the smallest heights, originate from relatively
younger progenitors with ages of about several 100 Myr, 91bg-like SNe,
having the highest distribution, arise from progenitors with
significantly older ages ∼10 Gyr, and normal SNe Ia, which distributed
between those of the two others, are from progenitors of about one up
to ∼10 Gyr. We find a correlation between LC decline rates and SN Ia
heights, which is explained by the vertical age gradient of the
stellar population in discs and a sub-Chandrasekhar mass white dwarf
explosion models, where the Δm15 parameter is a progenitor age
indicator.
Description:
The table contains new database of 197 individual SNe Ia (SN
designation, SN projected radius U along the plane of its host disc
and SN height V from the plane, spectroscopic subclass and
Δm15 with their sources) and their 196 hosts (galaxy
designation, distance, morphological type, semimajor R25, and
semiminor Z25 axes).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea5.dat 175 197 Data on 197 SNe Ia and their 196 hosts
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- SN Supernova (SN) name
25- 28 A4 --- Type SN subclass (1)
30- 72 A43 --- r_Type Source of SN subclass
74- 79 F6.3 arcsec Usn SN projected radius U along the plane of
its host disc
81- 86 F6.3 arcsec Vsn SN height V from the plane
88- 92 F5.3 mag dm15 ? SN light curve (LC) decline rate
94- 99 F6.4 mag e_dm15 ? Error of SN LC decline rate
101-119 A19 --- r_dm15 Source of SN LC decline rate
121-144 A24 --- Gal SN host galaxy name
146-152 F7.3 Mpc Dist Host galaxy distance
154-157 A4 --- MType Host galaxy morphological type
159 A1 --- u_MType [:?] Uncertainty flag on morphology (2)
161-167 F7.3 arcsec R25 Host galaxy semimajor R25 axis
169-175 F7.3 arcsec Z25 Host galaxy semiminor Z25 axis
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Note (1): Note on SN subclass as follows:
norm = normal Type Ia SNe
91T = overluminous 91T-like SNe
91bg = subluminous 91bg-like SNe
Note (2): Uncertainty flag on morphology as follows:
: = uncertain
? = highly uncertain
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Acknowledgements:
Lilit Barkhudaryan, l.barkhudaryan(at)yerphi.am
(End) Lilit Barkhudaryan [YerPHI], Patricia Vannier [CDS] 27-Jan-2023