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...
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...
Seeking the Progenitors of Type Ia Supernovae (2009)
The nature of the progenitor system[s] of Type Ia Supernovae is still unclear. In this contribution I review the projects that have been undertaken to answer this question and the results they have...
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., ...
Seeking for the progenitors of type Ia supernovae (2008)
Patat, Ferdinando, Chandra, Poonam, Chevalier, Roger, Justham, Stephen, Podsiadlowski, Philipp, Wolf, Christian, ...
Constraints on Circumstellar Material Around the Type Ia Supernova 2007af (2007)
Simon, Joshua D., Gal-Yam, Avishay, Penprase, Bryan E., Li, Weidong, Quimby, Robert M., Silverman, Jeffrey M., ...
Patat et al. recently inferred the existence of circumstellar material around a normal Type Ia supernova (SN) for the first time, finding time-variable Na I D absorption lines in the spectrum of SN...
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...
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Spectropolarimetric diagnostics of thermonuclear supernova explosions (2006)
Wang, Lifan, Baade, Dietrich, Patat, Ferdinando
Even at extragalactic distances, the shape of supernova ejecta can be effectively diagnosed by spectropolarimetry. We present here results for 17 Type Ia supernovae that allow a statistical study of...
Error Analysis for Dual-Beam Optical Linear Polarimetry (2005)
Patat, Ferdinando, Romaniello, Martino
In this paper we present an error analysis for polarimetric data obtained with dual-beam instruments. After recalling the basic concepts, we introduce the analytical expressions for the uncertainties...
Romaniello, Martino, Patat, Ferdinando, Panagia, Nino, Sparks, William B., Gilmozzi, Roberto, Spyromilio, Jason
We have used FORS1 at the ESO VLT to search for light echoes in imaging polarimetry from four historical supernovae in the face-on nearby spiral galaxy M83 (NGC 5236). No echoes were detected around...
Spectroscopy of the type Ia supernova SN 2002er: days -11 to +215 (2005)
Kotak, Rubina, Meikle, Peter, Pignata, Giuliano, Stehle, Matthias, Smartt, Steve, Benetti, Stefano, ...
We present an extensive set of optical spectroscopy of the nearby type Ia supernova, SN 2002er, with 24 epochs spanning -11 to +34 days. Its spectral evolution is fairly typical of a type Ia...
Pre-Maximum Spectropolarimetry of the Type Ia SN 2004dt (2004)
Wang, Lifan, Baade, Dietrich, Hoeflich, Peter, Wheeler, J. Craig, Kawabata, Koji, Khokhlov, Alexei, ...
We report observations of SN 2004dt obtained with the Very Large Telescope of the European Southern Observatory on August 13.30, 2004 when the supernova was more than a week before optical maximum....
Metal abundances in extremely distant Galactic old open clusters. I. Berkeley 29 and Saurer 1 (2004)
Carraro, Giovanni, Bresolin, Fabio, Villanova, Sandro, Matteucci, Francesca, Patat, Ferdinando, Romaniello, Martino
We report on high resolution spectroscopy of four giant stars in the Galactic old open clusters Berkeley~29 and Saurer~1 obtained with HIRES at the Keck telescope. These two clusters possess the...
Optical and near-IR observations of SN 1998bw (2004)
SN 1998bw, especially after the discovery of GRB 030329/SN 2003dh, seems to be the equivalent of the Rosetta stone for the SN/GRB connection. In this paper I review optical and near IR observations...
The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16 (2004)
Carraro, Giovanni, Romaniello, Martino, Ventura, Paolo, Patat, Ferdinando
In this paper we present and analyze new CCD $UBVRI$ photometry down to $V \approx$ 21 in the region of the young open cluster Collinder 232, located in the Carina spiral arm, and discuss its...
UBVRI Night sky brightness during sunspot maximum at ESO-Paranal (2003)
In this paper we present and discuss for the first time a large data set of UBVRI night sky brightness measurements collected at ESO-Paranal from April 2000 to September 2001. A total of about 3900...
Light Echoes in Type Ia Supernovae (2002)
Light echoes are a promising tool to probe the environment where SNe Ia explode and an independent source of information on the progenitor's nature. After giving a brief introduction to the...
Youn open clusters in the Carina region (2002)
Carraro, Giovanni, Marigo, Paola, Ventura, Paolo, Romaniello, Martino, Patat, Ferdinando
We present results of a new investigation (Carraro et al. 2002) aimed at clarifying the mutual relationship between the most prominent young open clusters close to eta Carinae, namely Trumpler 16,...
Carraro, Giovanni, Patat, Ferdinando
In this paper we present and analyze CCD $UBVRI$ photometry in the region of the three young open clusters NGC 3114, Collinder~228, and vdB-Hagen~99,
Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11 (2001)
Patat, Ferdinando, Carraro, Giovanni
We report on the first UBVRI CCD photometry of three poorly known star clusterings in the region of Eta Carinae: Bochum9, Bochum10 and Bochum11. We found that they are young, rather poor and loose...
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...