Variable Sodium Absorption in a Low-extinction Type Ia Supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
Recent observations have revealed that some Type Ia supernovae exhibit narrow, time-variable Na I D absorption features. The origin of the absorbing material is controversial, but it may suggest the...
Pian, Elena, Campana, Sergio, Chincarini, Guido, Corcoran, Michael F., Hamaguchi, Kenji, Gull, Theodore, ...
We observed the massive binary stellar system of Eta Carinae in the 0.3-10 keV energy range with the X-ray Telescope onboard the Swift satellite during the period 15 December 2008 - 11 March 2009,...
Tanaka, Masaomi, Kawabata, Koji S., Yamanaka, Masayuki, Maeda, Keiichi, Hattori, Takashi, Aoki, Kentaro, ...
We present the first spectropolarimetric observations of a candidate of super-Chandrasekhar mass Type Ia supernova (SN): SN 2009dc. The observations were performed at 5.6 and 89.5 days after the...
SN2003bg: a broad-lined Type IIb Supernova with Hydrogen (2009)
Mazzali, Paolo A., Deng, Jinsong, Hamuy, Mario, Nomoto, Ken'ichi
Models for the spectra and the light curve, in the photospheric as well as in the late nebular phase, are used to infer the properties of the very radio-bright, broad-lined type IIb Supernova 2003bg....
SN 2003bg: The First Type IIb Hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
Optical and near-infrared photometry and optical spectroscopy are reported for SN 2003bg, starting a few days after explosion and extending for a period of more than 300 days. Our early-time spectra...
Hachinger, Stephan, Mazzali, Paolo A., Taubenberger, Stefan, Pakmor, Ruediger, Hillebrandt, Wolfgang
The properties of underluminous type Ia supernovae (SNe Ia) of the 91bg subclass have yet to be theoretically understood. Here, we take a closer look at the structure of the dim SN Ia 2005bl. We...
Variable Sodium Absorption in a Low-Extinction Type Ia Supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
Recent observations have revealed that some Type Ia supernovae exhibit narrow, time-variable Na I D absorption features. The origin of the absorbing material is controversial, but it may suggest the...
Tanaka, Masaomi, Yamanaka, Masayuki, Maeda, Keiichi, Kawabata, Koji S., Hattori, Takashi, Minezaki, Takeo, ...
We present optical spectroscopic and photometric observations of supernova (SN) 2008D, associated with the luminous X-ray transient 080109, at >300 days after the explosion (nebular phases). We also...
Tanaka, Masaomi, Kawabata, Koji S., Maeda, Keiichi, Iye, Masanori, Hattori, Takashi, Pian, Elena, ...
We present an optical spectropolarimetric observation of the unique Type Ib supernova (SN) 2005bf at 8 days after the second maximum. The data, combined with the polarization spectrum taken at 6 days...
Spectral luminosity indicators in SNe Ia — The R(Si II) line strength ratio (2009)
Hachinger, Stephan, Mazzali, Paolo A., Tanaka, Masaomi, Hillebrandt, Wolfgang, Benetti, Stefano
Optical emission from aspherical core-collapse supernovae (2009)
Tanaka, Masaomi, Maeda, Keiichi, Nomoto, Ken'ichi, Mazzali, Paolo A., Tominaga, Nozomu, Kawabata, Koji S., ...
Tanaka, Masaomi, Yamanaka, Masayuki, Maeda, Keiichi, Kawabata, Koji S., Hattori, Takashi, Minezaki, Takeo, ...
Tanaka, Masaomi, Kawabata, Koji S., Maeda, Keiichi, Iye, Masanori, Hattori, Takashi, Pian, Elena, ...
Variable sodium absorption in a low-extinction type Ia supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
SN 2003bg: a broad-lined type IIb supernova with hydrogen (2009)
Mazzali, Paolo A., Deng, Jinsong, Hamuy, Mario, Nomoto, Ken'ichi
Supernova 2003bg: the first type IIb hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
Subaru and Keck Observations of the Peculiar Type Ia Supernova 2006gz at Late Phases (2008)
Maeda, Keiichi, Kawabata, Koji, Li, Weidong, Tanaka, Masaomi, Mazzali, Paolo A., Hattori, Takashi, ...
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 during the explosion,...
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
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 novel features: (i)...
Hachinger, Stephan, Mazzali, Paolo A., Tanaka, Masaomi, Hillebrandt, Wolfgang, Benetti, Stefano
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 SNe Ia are a single...
Multi-Dimensional Simulations of Radiative Transfer in Aspherical Core-Collapse Supernovae (2008)
Tanaka, Masaomi, Maeda, Keiichi, Mazzali, Paolo A., Nomoto, Ken'ichi
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, we have developed...
Asphericity in Supernova Explosions from Late-Time Spectroscopy (2008)
Maeda, Keiichi, Kawabata, Koji, Mazzali, Paolo A., Tanaka, Masaomi, Valenti, Stefano, Nomoto, Ken'ichi, ...
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 aspherical. One important...
Asphericity in supernova explosions from late-time spectroscopy (2008)
Maeda, Keiichi, Kawabata, Koji, Mazzali, Paolo A., Tanaka, Masaomi, Valenti, Stefano, Nomoto, Ken'ichi, ...
The outermost ejecta of type Ia supernovae (2008)
Tanaka, Masaomi, Mazzali, Paolo A., Benetti, Stefano, Nomoto, Ken'ichi, Elias-Rosa, Nancy, Kotak, Rubina, ...
The evolution of the peculiar type Ia supernova SN 2005hk over 400 days (2008)
Sahu, D. K., Tanaka, Masaomi, Anupama, G. C., Kawabata, K. S., Maeda, Keiichi, Tominaga, Nozomu, ...
The progenitors of type I SNe (2008)
Mazzali, Paolo A., Nomoto, Ken'ichi, Maeda, Keiichi, Deng, Jinsong, Benetti, Stefano, Röpke, Friedrich, ...
Multi-dimensional simulations of radiative transfer in aspherical core-collapse supernovae (2008)
Tanaka, Masaomi, Maeda, Keiichi, Mazzali, Paolo A., Nomoto, Ken'ichi
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
The Outermost Ejecta of Type Ia Supernovae (2007)
Tanaka, Masaomi, Mazzali, Paolo A., Benetti, Stefano, Nomoto, Ken'ichi, Elias-Rosa, Nancy, Kotak, Rubina, ...
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 before maximum, SNe...
Models for the Type Ic Hypernova SN 2003lw associated with GRB 031203 (2007)
Mazzali, Paolo A., Deng, Jinsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
The Gamma-Ray Burst 031203 at a redshift z=0.1055 revealed a highly reddened Type Ic Supernova, SN 2003lw, in its afterglow light. This is the third well established case of a link between a...
The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days (2007)
Sahu, D. K., Tanaka, Masaomi, Anupama, G. C., Kawabata, Koji S., Maeda, Keiichi, Tominaga, Nozomu, ...
$UBVRI$ 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 after explosion....
Tanaka, Masaomi, Maeda, Keiichi, Mazzali, Paolo A., Nomoto, Ken'ichi
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 models, radiative...
Hypernovae and their Gamma-Ray Bursts Connection (2007)
Nomoto, Ken'ichi, Tanaka, Masaomi, Tominaga, Nozomu, Maeda, Keiichi, Mazzali, Paolo A.
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 GRB031203/SN 2003lw....
Maeda, Keiichi, Kawabata, Koji, Tanaka, Masaomi, Nomoto, Ken'ichi, Tominaga, Nozomu, Hattori, Takashi, ...
Optical spectroscopy and photometry of SN 2006aj have been performed with the Subaru telescope at t > 200 days after GRB060218, the X-ray Flash with which it was associated. Strong nebular...
Keck and ESO-VLT View of the Symmetry of the Ejecta of the XRF/SN 2006aj (2007)
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Nebular-phase spectra of SN 2006aj, which was discovered in coincidence with X-ray flash 060218, were obtained with Keck in 2006 July and the Very Large Telescope in 2006 September. At the latter...
Tominaga, Nozomu, Maeda, Keiichi, Umeda, Hideyuki, Nomoto, Ken'ichi, Tanaka, Masaomi, Iwamoto, Nobuyuki, ...
Long-duration gamma-ray bursts (GRBs) are thought to be connected to luminous and energetic supernovae (SNe), called hypernovae (HNe), resulting from the black-hole (BH) forming collapse of massive...
A common explosion mechanism for type Ia supernovae (2007)
Mazzali, Paolo A., Röpke, Friedrich K., Benetti, Stefano, Hillebrandt, Wolfgang
Tominaga, Nozomu, Maeda, Keiichi, Umeda, Hideyuki, Nomoto, Ken'ichi, Tanaka, Masaomi, Iwamoto, Nobuyuki, ...
Brown, Peter J., Dessart, Luc, Holland, Stephen T., Immler, Stefan, Landsman, Wayne, Blondin, Stéphane, ...
Tanaka, Masaomi, Tominaga, Nozomu, Nomoto, Ken'ichi, Maeda, Keiichi, Mazzali, Paolo A., Deng, Jingsong
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Supernovae and gamma-ray bursts (2007)
Mazzali, Paolo A., Nomoto, Ken'ichi, Maeda, Keiichi, Deng, Jinsong
Supernovae and gamma-ray bursts (2007)
Mazzali, Paolo A., Nomoto, Ken'ichi, Maeda, Keiichi, Deng, Jinsong
Constraints on type Ib/c supernovae and gamma-ray burst progenitors (2007)
Fryer, Chris L., Mazzali, Paolo A., Prochaska, Jason, Cappellaro, Enrico, Panaitescu, Alin, Berger, Edo, ...
Supernovae and Gamma-ray Bursts (2007)
Jinsong Deng, Keiichi Maeda, Kenichi Nomoto, Paolo A. Mazzali
Observational evidence indicates that the out ow of material in many, possibly even in all Supernovae, is not spherical. Here we review the evidence in Type Ic SNe associated with Gamma-Ray Bursts...
Early Ultraviolet, Optical and X-Ray Observations of the Type IIP SN 2005cs in M51 with Swift (2006)
Brown, Peter J., Dessart, Luc, Holland, Stephen T., Immler, Stefan, Landsman, Wayne, Blondin, Stephane, ...
We report early photospheric-phase observations of the Type IIP Supernova (SN) 2005cs obtained by Swift's Ultraviolet-Optical and X-Ray Telescopes. Observations started within two days of discovery...
Jeffery, David J., Mazzali, Paolo A.
Giant steps is a technique to accelerate Monte Carlo radiative transfer in optically-thick cells of astrophysical atmospheres by greatly reducing the number of Monte Carlo steps needed to propagate...
Cosmological Implications of the Second Parameter of Type Ia Supernovae (2006)
Podsiadlowski, Philipp, Mazzali, Paolo A., Lesaffre, Pierre, Wolf, Christian, Forster, Francisco
Theoretical models predict that the initial metallicity of the progenitor of a Type Ia supernova (SN Ia) affects the peak of the supernova light curve. This can cause a deviation from the standard...
The (54Fe+58Ni)/56Ni ratio as a second parameter for Type Ia supernova properties (2006)
Mazzali, Paolo A., Podsiadlowski, Philipp
A variation of the relative content of (54Fe+58Ni) versus 56Ni may be responsible for the observed scatter of Type Ia Supernovae (SNe Ia) about a mean relation between their intrinsic brightness and...
A neutron-star-driven X-ray flash associated with supernova SN 2006aj (2006)
Mazzali, Paolo A., Deng, Jinsong, Nomoto, Ken'ichi, Sauer, Daniel N., Pian, Elena, Tominaga, Nozomu, ...
Supernovae connected with long-duration gamma-ray bursts (GRBs) are hyper-energetic explosion resulting from the collapse of very massive stars (about 40Mo, where Mo is the mass of the Sun) stripped...
Models for the Type Ic Hypernova SN 2003lw associated with GRB 031203 (2006)
Mazzali, Paolo A., Deng, Jinsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
The Gamma-Ray Burst 031203 at a redshift z=0.1055 revealed a highly reddened Type Ic Supernova, SN 2003lw, in its afterglow light. This is the third well established case of a link between a...
3D Models for High Velocity Features in Type Ia Supernovae (2006)
Tanaka, Masaomi, Mazzali, Paolo A., Maeda, Keiichi, Nomoto, Ken'ichi
Spectral synthesis in 3-dimensional (3D) space for the earliest spectra of Type Ia supernovae (SNe Ia) is presented. In particular, the high velocity absorption features that are commonly seen at the...
The Optical/Near-Infrared Light Curves of SN 2002ap for the First 1.5 Years after Discovery (2006)
Tomita, Hiroyuki, Deng, Jinsong, Maeda, Keiichi, Yoshii, Yuzuru, Nomoto, Ken'ichi, Mazzali, Paolo A., ...
Late-time BVRIJHK photometry of the peculiar Type Ic SN 2002ap, taken between 2002 June 12 and 2003 August 29 with the MAGNUM telescope, is presented. The light curve decline rate is derived in each...
The optical/near-infrared light curves of SN 2002ap for the first 1.5 years after discovery (2006)
Tomita, Hiroyuki, Deng, Jinsong, Maeda, Keiichi, Yoshii, Yuzuru, Nomoto, Ken'ichi, Mazzali, Paolo A., ...
Three-dimensional models for high-velocity features in type Ia supernovae (2006)
Tanaka, Masaomi, Mazzali, Paolo A., Maeda, Keiichi, Nomoto, Ken'ichi
Models for the type Ic hypernova SN 2003lw associated with GRB 031203 (2006)
Mazzali, Paolo A., Deng, Jingsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
A neutron-star-driven X-ray flash associated with supernova SN 2006aj (2006)
Mazzali, Paolo A., Deng, Jinsong, Nomoto, Ken'ichi, Sauer, Daniel N., Pian, Elena, Tominaga, Nozomu, ...
The asymmetric explosion of type Ia supernovae as seen from near-infrared observations (2006)
Motohara, Kentaro, Maeda, Keiichi, Gerardy, Christopher L., Nomoto, Ken'ichi, Tanaka, Masaomi, Tominaga, Nozomu, ...
Hypernovae 1998bw and 2003jd: a link to gamma-ray bursts (2006)
Maeda, Keiichi, Kawabata, Koji, Nomoto, Ken'ichi, Mazzali, Paolo A.
Aspherical explosion models for type Ia supernovae (2006)
Tanaka, Masaomi, Nomoto, Ken'ichi, Maeda, Keiichi, Mazzali, Paolo A.
An asymmetric energetic type Ic supernova viewed off-axis, and a link to gamma ray bursts (2005)
Mazzali, Paolo A., Kawabata, Koji S., Maeda, Keiichi, Nomoto, Ken'ichi, Filippenko, Alexei V., Ramirez-Ruiz, Enrico, ...
An Off-Axis Model for GRB 031203 (2004)
Ramirez-Ruiz, Enrico, Granot, Jonathan, Kouveliotou, Chryssa, Woosley, S. E., Patel, Sandy K., Mazzali, Paolo A.
The low luminosity radio emission of the unusually faint GRB 031203 has been argued to support the idea of a class of intrinsically sub-energetic gamma-ray bursts (GRBs), currently comprising two...
Optical Photometry and Spectroscopy of the SN 1998bw-like Type Ic Supernova 2002ap (2003)
Foley, Ryan J., Papenkova, Marina S., Swift, Brandon J., Filippenko, Alexei V., Li, Weidong, Mazzali, Paolo A., ...
We present optical photometric and spectral data of the peculiar Type Ic SN 2002ap. Photometric coverage includes UBVRI bands from 2002 January 30, the day after discovery, through 2002 December 12....
The metamorphosis of SN1998bw (2001)
Patat, Ferdinando, Cappellaro, Enrico, Danziger, John, Mazzali, Paolo A., Sollerman, Jesper, Augusteijn, Thomas, ...
We present and discuss the photometric and spectroscopic evolution of the peculiar SN1998bw, associated with GRB980425, through an analysis of optical and near IR data collected at ESO-La Silla. The...
Mazzali, Paolo A., Nomoto, Ken'ichi, Cappellaro, Enrico, Nakamura, Takayoshi, Umeda, Hideyuki, Iwamoto, Koichi
The use of Type Ia supernovae as distance indicators relies on the determination of their brightness. This is not constant, but it can be calibrated using an observed relation between the brightness...
On the presence of Silicon and Carbon in the pre-maximum spectrum of the Type Ia SN 1990N (2000)
The spectrum of the normal Type Ia SN 1990N observed very early on (14 days before B maximum) was analysed by Fisher et al (1997), who showed that the large width and the unusual profile of the...
A Spectroscopic Analysis of the Energetic Type Ic `Hypernova' SN 1997ef (2000)
Mazzali, Paolo A., Iwamoto, Koichi, Nomoto, Ken'ichi
The properties of the bright and energetic Type Ic SN 1997ef are investigated using a Monte Carlo spectrum synthesis code. Analysis of the earliest spectra is used to determine the time of outburst....
Light Curve and Spectral Models for the Hypernova SN 1998bw associated with GRB980425 (2000)
Nakamura, Takayoshi, Mazzali, Paolo A., Nomoto, Ken'ichi, Iwamoto, Koichi
A refined model for the unusual Type Ic supernova 1998bw, discovered as the optical counterpart of GRB980425, is presented, and synthetic light curves and spectra are compared with the observations....