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SN 2006gy: was it really extra-ordinary?
I. Agnoletto, S. Benetti, E. Cappellaro +12
We present an optical photometric and spectroscopic study of the very luminous type IIn SN 2006gy for a time period spanning more than one year. In photometry, a broad, bright (M_R…
Subaru and Keck Observations of the Peculiar Type Ia Supernova 2006gz at Late Phases
Keiichi Maeda, Koji Kawabata, Weidong Li +5
Recently, a few peculiar Type Ia supernovae (SNe) that show exceptionally large peak luminosity have been discovered. Their luminosity requires more than 1 Msun of 56Ni ejected dur…
The metamorphosis of Supernova SN2008D/XRF080109: a link between Supernovae and GRBs/Hypernovae
Paolo A. Mazzali, Stefano Valenti, Massimo Della Valle +38
The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several n…
Type Ib Supernova 2008D associated with the Luminous X-ray Transient 080109: An Energetic Explosion of a Massive Helium Star
Masaomi Tanaka, Nozomu Tominaga, Ken'ichi Nomoto +11
We present a theoretical model for supernova (SN) 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modelled b…
Spectral luminosity indicators in SNe Ia - Understanding the R(SiII) line strength ratio and beyond
Stephan Hachinger, Paolo A. Mazzali, Masaomi Tanaka +2
SNe Ia are good distance indicators because the shape of their light curves, which can be measured independently of distance, varies smoothly with luminosity. This suggests that SN…
GALEX Spectroscopy of SN 2005ay suggests a UV spectral uniformity among type II-P supernovae
A. Gal-Yam, F. Bufano, T. Barlow +24
We present the first results from our GALEX program designed to obtain ultraviolet (UV) spectroscopy of nearby core-collapse supernovae (SNe). Our first target, SN 2005ay in the ne…
Multi-Dimensional Simulations of Radiative Transfer in Aspherical Core-Collapse Supernovae
Masaomi Tanaka, Keiichi Maeda, Paolo A. Mazzali +1
We study optical radiation of aspherical supernovae (SNe) and present an approach to verify the asphericity of SNe with optical observations of extragalactic SNe. For this purpose,…
Properties of the ultraviolet flux of type Ia supernovae: an analysis with synthetic spectra of SN 2001ep and SN 2001eh
D. N. Sauer, P. A. Mazzali, S. Blondin +7
The spectral properties of type Ia supernovae in the ultraviolet (UV) are investigated using the early-time spectra of SN 2001ep and SN 2001eh obtained using the Hubble Space Teles…
Possible signature of hypernova nucleosynthesis in a beryllium rich halo dwarf
R. Smiljanic, L. Pasquini, F. Primas +3
As part of a large survey of halo and thick disc stars, we found one halo star, HD 106038, exceptionally overabundant in beryllium. In spite of its low metallicity, [Fe/H] = -1.26,…
Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
A. Pastorello, S. Mattila, L. Zampieri +26
We present new spectroscopic and photometric data of the type Ibn supernovae 2006jc, 2000er and 2002ao. We discuss the general properties of this recently proposed supernova family…
Asphericity in Supernova Explosions from Late-Time Spectroscopy
Keiichi Maeda, Koji Kawabata, Paolo A. Mazzali +15
Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspher…
The Outermost Ejecta of Type Ia Supernovae
Masaomi Tanaka, Paolo A. Mazzali, Stefano Benetti +6
The properties of the highest velocity ejecta of normal Type Ia supernovae (SNe Ia) are studied via models of very early optical spectra of 6 SNe. At epochs earlier than 1 week bef…
The underluminous Type Ia Supernova 2005bl and the class of objects similar to SN 1991bg
S. Taubenberger, S. Hachinger, G. Pignata +24
Optical observations of the Type Ia supernova (SN Ia) 2005bl in NGC 4070, obtained from -6 to +66 d with respect to the B-band maximum, are presented. The photometric evolution is…
The Broad-lined Type Ic SN 2003jd
S. Valenti, S. Benetti, E. Cappellaro +27
The results of a world-wide coordinated observational campaign on the broad-lined Type Ic SN 2003jd are presented. In total, 74 photometric data points and 26 spectra were collecte…
A very faint core-collapse supernova in M85
A. Pastorello, M. Della Valle, S. J. Smartt +8
An anomalous transient in the early Hubble-type (S0) galaxy Messier 85 (M85) in the Virgo cluster was discovered by Kulkarni et al. (2007) on 7 January 2006 that had very low lumin…
The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days
D. K. Sahu, Masaomi Tanaka, G. C. Anupama +6
photometry and medium resolution optical spectroscopy of peculiar Type Ia supernova SN 2005hk are presented and analysed, covering the pre-maximum phase to around 400 days…
The early spectral evolution of SN 2004dt
G. Altavilla, M. Stehle, P. Ruiz-Lapuente +18
Aims. We study the optical spectroscopic properties of Type Ia Supernova (SN Ia) 2004dt, focusing our attention on the early epochs. Methods. Observation triggered soon after the S…
Upper limit for circumstellar gas around the Type Ia SN 2000cx
F. Patat, S. Benetti, S. Justham +8
The nature of the companion stars in Type Ia Supernova (SNe) progenitor systems remains unclear. One possible way to discriminate between different scenarios is the presence (or ab…
Multi-Dimensional Simulations for Early Phase Spectra of Aspherical Hypernovae: SN 1998bw and Off-Axis Hypernovae
Masaomi Tanaka, Keiichi Maeda, Paolo A. Mazzali +1
Early phase optical spectra of aspherical jet-like supernovae (SNe) are presented. We focus on energetic core-collapse SNe, or hypernovae. Based on hydrodynamic and nucleosynthetic…
The Aspherical Properties of the Energetic Type Ic SN 2002ap as Inferred from its Nebular Spectra
P. A. Mazzali, K. S. Kawabata, K. Maeda +10
The nebular spectra of the broad-lined, SN 1998bw-like Type Ic SN 2002ap are studied by means of synthetic spectra. Two different modelling techniques are employed. In one techniqu…
Detection of circumstellar material in a normal Type Ia Supernova
F. Patat, P. Chandra, R. Chevalier +19
Type Ia supernovae are thought to be thermonuclear explosions of accreting white dwarfs that reach a critical mass limit. Despite their importance as cosmological distance indicato…
Hypernovae and their Gamma-Ray Bursts Connection
Ken'ichi Nomoto, Masaomi Tanaka, Nozomu Tominaga +2
The connection between long Gamma Ray Bursts (GRBs) and Supernovae (SNe), have been established through the well observed cases of GRB980425/SN 1998bw, GRB030329/SN 2003dh and GRB0…
A three-dimensional deflagration model for Type Ia supernovae confronted with observations
F. K. Roepke, W. Hillebrandt, W. Schmidt +3
A simulation of the thermonuclear explosion of a Chandrasekhar-mass C+O white dwarf, the most popular scenario of a type Ia supernova (SN Ia), is presented. The underlying modeling…
The Unique Type Ib Supernova 2005bf at Nebular Phases: A Possible Birth Event of A Strongly Magnetized Neutron Star
K. Maeda, M. Tanaka, K. Nomoto +6
Late phase nebular spectra and photometry of Type Ib Supernova (SN) 2005bf taken by the Subaru telescope at ~ 270 and ~ 310 days since the explosion are presented. Emission lines (…