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A Common Explosion Mechanism for Type Ia Supernovae
A systematic spectral analysis of a large sample of well-observed type Ia supernovae finds that allsupernovae have low-velocity cores of stable iron-group elements and suggests that their progenitors had the same mass. Expand
The Diversity of Type Ia Supernovae: Evidence for Systematics?
The photometric and spectroscopic properties of 26 well-observed Type Ia Supernovae (SNe Ia) were analyzed with the aim of exploring SN Ia diversity. The sample includes (Branch) normal SNe, as wellExpand
Low‐luminosity Type II supernovae: spectroscopic and photometric evolution
In this paper we present spectroscopic and photometric observations for four core-collapsed supernovae (SNe), namely SNe 1994N, 1999br, 1999eu and 2001dc. Together with SN 1997D, we show that theyExpand
Cepheid calibration of Type Ia supernovae and the Hubble constant
We investigate how a different calibration of the Cepheid period-luminosity (PL) relation, taking into account metallicity corrections, affects the absolute magnitude calibration of Type IaExpand
Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger
The spectral identification and physical properties of a bright kilonova associated with the gravitational-wave source GW170817 and γ-ray burst GRB 170817A associated with a galaxy at a distance of 40 megaparsecs from Earth are described. Expand
Super-luminous Type Ic Supernovae: Catching a Magnetar by the Tail
We report extensive observational data for five of the lowest redshift Super-Luminous Type Ic Supernovae (SL-SNe Ic) discovered to date, namely PTF10hgi, SN2011ke, PTF11rks, SN2011kf and SN2012il.Expand
Photometry and Spectroscopy of the Type IIP SN 1999em from Outburst to Dust Formation
We present photometry and spectra of the Type IIP supernova 1999em in NGC 1637 from several days after the outburst till day 642. The radioactive tail of the recovered bolometric light curve of SNExpand
Detection of Circumstellar Material in a Normal Type Ia Supernova
The spectroscopic detection of circumstellar material in a normal type Ia supernova explosion indicates that this material was ejected from the progenitor system. Expand
A giant outburst two years before the core-collapse of a massive star
It is reported that the peculiar type Ib supernova SN 2006jc is spatially coincident with a bright optical transient that occurred in 2004, andSpectroscopic and photometric monitoring of the supernova leads us to suggest that the progenitor was a carbon-oxygen Wolf–Rayet star embedded within a helium-rich circumstellar medium. Expand
High luminosity, slow ejecta and persistent carbon lines: SN 2009dc challenges thermonuclear explosion scenarios
Extended optical and near-IR observations reveal that SN 2009dc shares a number of similarities with normal Type Ia supernovae (SNe Ia), but is clearly overluminous, with a (pseudo-bolometric) peakExpand