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 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 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 Host Galaxies of High-Redshift Type Ia Supernovae

2005 ◽  
Vol 192 ◽  
pp. 555-560
Author(s):  
Mark Sullivan ◽  
Richard Ellis ◽  
Keyword(s):  
Cosmological Constant ◽  
High Redshift ◽  
Cosmological Parameters ◽  
Type Systems ◽  
Host Galaxy ◽  
Type Ia Supernovae ◽  
Early Type ◽  
Late Type ◽  
Type Ia ◽  
Ia Supernovae

SummaryWe present new results on the Hubble diagram of distant type Ia supernovae (SNe Ia) segregated according to the type of host galaxy. This makes it possible to check earlier evidence for a cosmological constant by explicitly comparing SNe residing in galaxies likely to contain negligible dust with the larger sample. The cosmological parameters derived from these SNe Ia hosted by presumed dust-free early-type galaxies support earlier claims for a cosmological constant, which we demonstrate at ≃ 5σ significance, and the internal extinction implied is small even for late-type systems (AB < 0.2). Furthermore, the scatter observed in the SNe Ia Hubble diagrams correlates closely with host galaxy morphology. We find this scatter is smallest for SNe Ia occurring in early-type hosts and largest for those in late-type galaxies. Moreover, SNe residing in late-type hosts appear fainter in their light-curve-width-corrected luminosity than those in early-type hosts, as expected if a modest amount of dust extinction is a contributing factor. Thus, our data demonstrate that host galaxy extinction is unlikely to systematically dim distant SNe Ia in a manner that would produce a spurious cosmological constant.

Stellar Metallicities and Type Ia Supernova Rates in the Early‐Type Galaxy NGC 5846 fromROSATandASCAObservations

1999 ◽  
Vol 514 (2) ◽  
pp. 844-855 ◽  
Author(s):  
A. Finoguenov ◽  
C. Jones ◽  
W. Forman ◽  
L. David
Keyword(s):  
Early Type ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Early Type Galaxy

scholarly journals Giant planets around AF and M stars

2013 ◽  
Vol 8 (S299) ◽  
pp. 64-65
Author(s):  
Julien Rameau ◽  
Gaël Chauvin ◽  
Anne-Marie Lagrange ◽  
Philippe Delorme ◽  
Justine Lannier
Keyword(s):  
Giant Planets ◽  
Early Type ◽  
Late Type ◽  
M Dwarfs ◽  
Low Mass Stars ◽  
Planetary Mass ◽  
Nearby Stars ◽  
Low Mass ◽  
M Stars ◽  
The One

AbstractWe present the results of two three-year surveys of young and nearby stars to search for wide orbit giant planets. On the one hand, we focus on early-type and massive, namely β Pictoris analogs. On the other hand, we observe late type and very low mass stars, i.e., M dwarfs. We report individual detections of new planetary mass objects. According to our deep detection performances, we derive the observed frequency of giant planets between these two classes of parent stars. We find frequency between 6 to 12% but we are not able to assess a/no correlation with the host-mass.

scholarly journals Chimney technique with endoanchors in treatment of late type 1a endoleak after endovascular aortic repair

2020 ◽  
Vol 8 ◽  
pp. 2050313X2095301
Author(s):  
Emanuele Gatta ◽  
Gabriele Pagliariccio ◽  
Sara Schiavon ◽  
Carlo Grilli Cicilioni ◽  
Luciano Carbonari
Keyword(s):  
Open Repair ◽  
Endovascular Aortic Repair ◽  
Late Type ◽  
Stent Grafts ◽  
Computed Tomographic ◽  
Chimney Technique ◽  
Aortic Repair ◽  
Computed Tomographic Scan ◽  
Type Ia ◽  
Long Time

The late type Ia endoleak after endovascular aortic repair could be a challenging issue. Over the last years, in case of short or enlarged neck, fenestrated and branched stent grafts have been increasingly employed with improving results. However, these devices have limited use in urgent/emergent cases as custom graft manufacturing takes long time, and may not be fit in patients with particular anatomic features. In this setting, chimney and relining remain an alternative but sometimes may not be adequate. According to literature, the use of the endoanchors associated to chimney technique can improve the procedure results in primary endovascular aortic repair. We treated two patients with a late type Ia endoleak after endovascular aortic repair with a simultaneous relining, single renal chimney, and endoanchors implant. These patients were valuated unfit for open repair with neck configuration unadapt for a simple relining, ballooning, or stenting. The patient conditions were unfavorable for an endovascular repair with branched endovascular aortic repair–fenestrated endovascular aortic repair. The same procedure was performed in both patients. Postoperative angio-computed tomographic scan demonstrated the resolution of the endoleak with patency of renal graft. Our preliminary experience, in these selected cases, demonstrate the feasibility of the technique in late type Ia endoleak.

scholarly journals Star formation in early-type galaxies: the role of stellar winds and kinematics

2015 ◽  
Vol 11 (S315) ◽  
Author(s):  
Silvia Pellegrini ◽  
Andrea Negri ◽  
Luca Ciotti
Keyword(s):  
Star Formation ◽  
High Resolution ◽  
Type Ia Supernovae ◽  
Stellar Winds ◽  
Early Type ◽  
Stellar Component ◽  
Type Ia ◽  
Hydrodynamical Simulations ◽  
Ia Supernovae

AbstractEarly-type galaxies (ETGs) host a hot ISM produced mainly by stellar winds, and heated by Type Ia supernovae and the thermalization of stellar motions. High resolution 2D hydrodynamical simulations showed that ordered rotation in the stellar component results in the formation of a centrifugally supported cold equatorial disc. In a recent numerical investigation we found that subsequent generations of stars are formed in this cold disc; this process consumes most of the cold gas, leaving at the present epoch cold masses comparable to those observed. Most of the new stellar mass formed a few Gyrs ago, and resides in a disc.

scholarly journals Supernova Rates

1996 ◽  
Vol 145 ◽  
pp. 1-9 ◽  
Author(s):  
Sidney Van Den Bergh
Keyword(s):  
Luminosity Function ◽  
Historical Data ◽  
Starburst Galaxies ◽  
Early Type ◽  
Late Type ◽  
Interstellar Absorption ◽  
Blue Galaxies ◽  
S0 Galaxies ◽  
Intermediate Redshifts ◽  
Parent Galaxy

Extragalactic supernova rates are reviewed. The main uncertainties in calculated rates are due to (1) the influence of the (still poorly known) luminosity function of supernova of a given type on “control times”, to (2) uncertain corrections for possible inclination - dependent bias in supernova discovery probabilities, and (3) interstellar absorption. The total supernova rate in late-type galaxies is found to be ∼ 2(H0/75)2 supernovae (SNe) per century per 1010LB(ʘ) This is consistent with the rate of 3 SNe per century that is derived from the historical data on Galactic supernovae. It is, however, a source of some concern that none of the three Galactic SNe expected to have occurred during the last century was actually observed!The expansion velocities of SNe Ia are found to correlate strongly with parent galaxy Hubble type. This relation is in the sense that low expansion velocities are only observed for those SNe Ia that occur in early-type galaxies. This suggests that V(exp) correlates with the ages of SNe Ia progenitors. It is speculated that the progenitors of a few SNe Ia with high V(exp) values in E and S0 galaxies were formed during recent starbursts.SNe Ia rates appear to be enhanced in post-starburst galaxies. It is suggested that supernova rates might be quite high in the recently discovered population of faint blue galaxies at intermediate redshifts.

scholarly journals A Simulation of Galaxy Formation by Radiation-SPH

2003 ◽  
Vol 208 ◽  
pp. 323-330
Author(s):  
Hajime Susa ◽  
Masayuki Umemura
Keyword(s):  
Star Formation ◽  
Radiation Field ◽  
Galaxy Formation ◽  
Background Radiation ◽  
Early Type ◽  
Late Type ◽  
Lower Redshift

We investigate galaxy formation with Radiation-SPH simulations in order to find the effects of ultraviolet background radiation field on the star formation in the forming galaxies. We find the ultraviolet background radiation field can delay the star formation in protogalactic clouds, especially at low redshift (z < 2). This result suggests that galaxies formed at lower redshift tend to be late type galaxies, and early type galaxies tend to be formed at higher redshift.

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