scholarly journals Supernovae and their host galaxies – VII. The diversity of Type Ia supernova progenitors

2020 ◽  
Vol 499 (1) ◽  
pp. 1424-1440
Author(s):  
A A Hakobyan ◽  
L V Barkhudaryan ◽  
A G Karapetyan ◽  
M H Gevorgyan ◽  
G A Mamon ◽  
...  
Keyword(s):  
Light Curve ◽  
Early Type ◽  
Young Population ◽  
Late Type ◽  
Host Galaxies ◽  
Decline Rate ◽  
Type Ia ◽  
First Time ◽  
Global Parameters ◽  
Host Relations

ABSTRACT We present an analysis of the light curve (LC) decline rates (Δm15) of 407 normal and peculiar supernovae (SNe) Ia and global parameters of their host galaxies. As previously known, there is a significant correlation between the Δm15 of normal SNe Ia and global ages (morphologies, colours, and masses) of their hosts. On average, those normal SNe Ia that are in galaxies from the Red Sequence (early-type, massive, old hosts) have faster declining LCs in comparison with those from the Blue Cloud (late-type, less massive, younger hosts) of the colour–mass diagram. The observed correlations between the Δm15 of normal SNe Ia and hosts’ parameters appear to be due to the superposition of at least two distinct populations of faster and slower declining normal SNe Ia from older and younger stellar components. We show, for the first time, that the Δm15 of 91bg- and 91T-like SNe is independent of host morphology and colour. The distribution of hosts on the colour–mass diagram confirms the known tendency for 91bg-like SNe to occur in globally red/old galaxies, while 91T-like events prefer blue/younger hosts. On average, the youngest global ages of 02cx-like SNe hosts and their positions in the colour–mass diagram hint that these events likely originate from young population, but they differ from 91T-like events in the LC decline rate. Finally, we discuss the possible explosion channels and present our favoured SN Ia models that have the potential to explain the observed SN–host relations.

scholarly journals The dependence of Type Ia Supernovae salt2 light-curve parameters on host galaxy morphology

2020 ◽  
Vol 499 (4) ◽  
pp. 5121-5135
Author(s):  
M V Pruzhinskaya ◽  
A K Novinskaya ◽  
N Pauna ◽  
P Rosnet
Keyword(s):  
Light Curve ◽  
Host Galaxy ◽  
Type Ia Supernovae ◽  
Distance Modulus ◽  
Early Type ◽  
Late Type ◽  
Hubble Diagram ◽  
Type Ia ◽  
Ia Supernovae ◽  
Galaxy Morphology

ABSTRACT Type Ia Supernovae (SNe Ia) are widely used to measure distances in the Universe. Despite the recent progress achieved in SN Ia standardization, the Hubble diagram still shows some remaining intrinsic dispersion. The remaining scatter in supernova luminosity could be due to the environmental effects that are accounted for as mass step correction in the current cosmological analyses. In this work, we compare the local and global colour (U − V), the local star formation rate, and the host stellar mass to the host galaxy morphology. The observed trends suggest that the host galaxy morphology is a relevant parameter to characterize the SN Ia environment. Therefore, we study the influence of host galaxy morphology on light-curve parameters of SNe Ia from the pantheon cosmological supernova sample. We determine the Hubble morphological type of host galaxies for a subsample of 330 SNe Ia. We confirm that the salt2 stretch parameter x1 depends on the host morphology with the p-value ∼10−14. The supernovae with lower stretch value are hosted mainly by elliptical and lenticular galaxies. No correlation for the salt2 colour parameter c is found. We also examine Hubble diagram residuals for supernovae hosted by ‘early-type’ and ‘late-type’ morphological groups of galaxies. The analysis reveals that the mean distance modulus residual in early-type galaxies is smaller than the one in late-type galaxies, which means that early-type galaxies contain brighter supernovae after stretch and colour corrections. However, we do not observe any difference in the residual dispersion for these two morphological groups. The obtained results are in the line with other analyses showing environmental dependence of SN Ia light-curve parameters and luminosity. We confirm the importance of including a host galaxy parameter into the standardization procedure of SNe Ia for further cosmological studies.

scholarly journals SDSS J211852.96−073227.5: The first non-local, interacting, late-type intermediate Seyfert galaxy with relativistic jets

2020 ◽  
Vol 636 ◽  
pp. L12 ◽  
Author(s):  
E. Järvelä ◽  
M. Berton ◽  
S. Ciroi ◽  
E. Congiu ◽  
A. Lähteenmäki ◽  
...  
Keyword(s):  
Near Infrared ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Seyfert Galaxy ◽  
Late Type ◽  
Host Galaxies ◽  
Relativistic Jets ◽  
Galaxy Interactions ◽  
Non Local ◽  
First Time

It has been often suggested that a tangible relation exists between relativistic jets in active galactic nuclei (AGN) and the morphology of their host galaxies. In particular, relativistic jets may commonly be related to merging events. Here we present for the first time a detailed spectroscopic and morphological analysis of a Seyfert galaxy, SDSS J211852.96−073227.5, at z = 0.26. This source has previously been classified as a gamma-ray emitting narrow-line Seyfert 1 galaxy. We re-observed it with the 6.5 m Clay Telescope and these new, high-quality spectroscopic data have revealed that it is actually an intermediate-type Seyfert galaxy. Furthermore, the results of modelling the Ks-band near-infrared images obtained with the 6.5 m Baade Telescope indicate that the AGN is hosted by a late-type galaxy in an interacting system, strengthening the suggested connection between galaxy interactions and relativistic jets.

Spectroscopic differences between supernovae of type IA in early-type and in late-type galaxies

1993 ◽  
Vol 105 ◽  
pp. 2231 ◽  
Author(s):  
David Branch ◽  
Sidney van den Bergh
Keyword(s):  
Early Type ◽  
Late Type ◽  
Type Ia

On the progenitors of type IA supernovae in early-type and late-type galaxies

1994 ◽  
Vol 423 ◽  
pp. L31 ◽  
Author(s):  
Massimo della Valle ◽  
Mario Livio
Keyword(s):  
Type Ia Supernovae ◽  
Early Type ◽  
Late Type ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals EARLY-TYPE HOST GALAXIES OF TYPE Ia SUPERNOVAE. I. EVIDENCE FOR DOWNSIZING

2016 ◽  
Vol 223 (1) ◽  
pp. 7 ◽  
Author(s):  
Yijung Kang ◽  
Young-Lo Kim ◽  
Dongwook Lim ◽  
Chul Chung ◽  
Young-Wook Lee
Keyword(s):  
Type Ia Supernovae ◽  
Early Type ◽  
Host Galaxies ◽  
Type Host ◽  
Type Ia ◽  
Ia Supernovae

Spectropolarimetric Diagnostics of Thermonuclear Supernova Explosions

Science ◽  
2006 ◽  
Vol 315 (5809) ◽  
pp. 212-214 ◽  
Author(s):  
Lifan Wang ◽  
Dietrich Baade ◽  
Ferdinando Patat
Keyword(s):  
Light Curve ◽  
Outer Layer ◽  
Statistical Study ◽  
Strong Support ◽  
Type Ia Supernovae ◽  
Geometric Structures ◽  
Decline Rate ◽  
Type Ia ◽  
Supernova Explosions ◽  
Ia Supernovae

Even at extragalactic distances, the shape of supernova ejecta can be effectively diagnosed by spectropolarimetry. We present results for 17 type Ia supernovae that allow a statistical study of the correlation among the geometric structures and other observable parameters of type Ia supernovae. These observations suggest that type Ia supernova ejecta typically consist of a smooth, central, iron-rich core and an outer layer with chemical asymmetries. The degree of this peripheral asphericity is correlated with the light-curve decline rate of type Ia supernovae. These results lend strong support to delayed-detonation models of type Ia supernovae.

scholarly journals Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals

2019 ◽  
Vol 490 (1) ◽  
pp. 718-732 ◽  
Author(s):  
L V Barkhudaryan ◽  
A A Hakobyan ◽  
A G Karapetyan ◽  
G A Mamon ◽  
D Kunth ◽  
...  
Keyword(s):  
Star Formation ◽  
Galaxy Evolution ◽  
Host Galaxies ◽  
Transitional State ◽  
Stellar Ages ◽  
Delay Times ◽  
Type Ia ◽  
Colour Distribution ◽  
Host Properties ◽  
Global Parameters

ABSTRACT We present an analysis of the galactocentric distributions of the ‘normal’ and peculiar ‘91bg-like’ subclasses of 109 supernovae (SNe) Ia, and study the global parameters of their elliptical hosts. The galactocentric distributions of the SN subclasses are consistent with each other and with the radial light distribution of host stellar populations, when excluding bias against central SNe. Among the global parameters, only the distributions of u − r colours and ages are inconsistent significantly between the ellipticals of different SN Ia subclasses: the normal SN hosts are on average bluer/younger than those of 91bg-like SNe. In the colour–mass diagram, the tail of colour distribution of normal SN hosts stretches into the Green Valley – transitional state of galaxy evolution, while the same tail of 91bg-like SN hosts barely reaches that region. Therefore, the bluer/younger ellipticals might have more residual star formation that gives rise to younger ‘prompt’ progenitors, resulting in normal SNe Ia with shorter delay times. The redder and older ellipticals that already exhausted their gas for star formation may produce significantly less normal SNe with shorter delay times, outnumbered by ‘delayed’ 91bg-like events. The host ages (lower age limit of the delay times) of 91bg-like SNe does not extend down to the stellar ages that produce significant u-band fluxes – the 91bg-like events have no prompt progenitors. Our results favour SN Ia progenitor models such as He-ignited violent mergers that have the potential to explain the observed SN/host properties.

scholarly journals Mass-to-Light Ratios of Early- and Late-Type Galaxies

2004 ◽  
Vol 220 ◽  
pp. 145-146
Author(s):  
Tereasa G. Brainerd ◽  
Michael A. Specian
Keyword(s):  
Early Type ◽  
Late Type ◽  
Host Galaxies ◽  
Data Release ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Satellite Galaxies

Using the 100k data release of the 2dF Galaxy Redshift Survey (2dFGRS), we obtain mass-to-light ratios for isolated “host” galaxies via the dynamics of satellite galaxies which orbit about them. Distinct differences are seen in the dependence of M/L on host luminosity for early-type vs. late-type hosts.

scholarly journals THE LUMINOSITY OF TYPE IA SUPERNOVA AND THE PROPERTIES OF THEIR EARLY-TYPE HOST GALAXIES

2015 ◽  
Vol 30 (2) ◽  
pp. 487-488
Author(s):  
YIJUNG KANG ◽  
YOUNG-LO KIM ◽  
YOUNG-WOOK LEE ◽  
DONGWOOK LIM ◽  
CHUL CHUNG ◽  
...  
Keyword(s):  
Early Type ◽  
Host Galaxies ◽  
Type Host ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals First systematic high-precision survey of bright supernovae

2020 ◽  
Vol 643 ◽  
pp. A35
Author(s):  
E. Paraskeva ◽  
A. Z. Bonanos ◽  
A. Liakos ◽  
Z. T. Spetsieri ◽  
J. R. Maund
Keyword(s):  
Light Curve ◽  
High Precision ◽  
Early Stage ◽  
Binary Star ◽  
Light Curves ◽  
Host Galaxies ◽  
Rapid Variability ◽  
Type Ia ◽  
Ia Supernovae ◽  
High Cadence

Rapid variability before and near the maximum brightness of supernovae has the potential to provide a better understanding of nearly every aspect of supernovae, from the physics of the explosion up to their progenitors and the circumstellar environment. Thanks to modern time-domain optical surveys, which are discovering supernovae in the early stage of their evolution, we have the unique opportunity to capture their intraday behavior before maximum. We present high-cadence photometric monitoring (on the order of seconds-minutes) of the optical light curves of three Type Ia and two Type II SNe over several nights before and near maximum light, using the fast imagers available on the 2.3 m Aristarchos telescope at Helmos Observatory and the 1.2 m telescope at Kryoneri Observatory in Greece. We applied differential aperture photometry techniques using optimal apertures and we present reconstructed light curves after implementing a seeing correction and the Trend Filtering Algorithm (TFA, Kovács et al. 2005, MNRAS, 356, 557). TFA yielded the best results, achieving a typical precision between 0.01 and 0.04 mag. We did not detect significant bumps with amplitudes greater than 0.05 mag in any of the SNe targets in the VR-, R-, and I-bands light curves obtained. We measured the intraday slope for each light curve, which ranges between −0.37−0.36 mag day−1 in broadband VR, −0.19−0.31 mag day−1 in R band, and −0.13−0.10 mag day−1 in I band. We used SNe light curve fitting templates for SN 2018gv, SN 2018hgc and SN 2018hhn to photometrically classify the light curves and to calculate the time of maximum. We provide values for the maximum of SN 2018zd after applying a low-order polynomial fit and SN 2018hhn for the first time. We conclude that optimal aperture photometry in combination with TFA provides the highest-precision light curves for SNe that are relatively well separated from the centers of their host galaxies. This work aims to inspire the use of ground-based, high-cadence and high-precision photometry to study SNe with the purpose of revealing clues and properties of the explosion environment of both core-collapse and Type Ia supernovae, the explosion mechanisms, binary star interaction and progenitor channels. We suggest monitoring early supernovae light curves in hotter (bluer) bands with a cadence of hours as a promising way of investigating the post-explosion photometric behavior of the progenitor stars.

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