Dust and the type II-plateau supernova 2004et (2009)
Kotak, Rubina, Meikle, Peter, Farrah, Duncan, Gerardy, Christopher, Foley, Ryan, Van Dyk, Schuyler, ...
We present mid-infrared (MIR) observations of the Type II-plateau supernova (SN) 2004et, obtained with the {\it Spitzer Space Telescope} between days 64 and 1406 past explosion. Late-time optical...
Groeningsson, Per, Fransson, Claes, Leibundgut, Bruno, Lundqvist, Peter, Challis, Peter, Chevalier, Roger A., ...
We present seven epochs between October 1999 and November 2007 of high resolution VLT/UVES echelle spectra of the ejecta-ring collision of SN 1987A. The fluxes of most of the narrow lines from the...
Optical identification of the 3C 58 pulsar wind nebula (2008)
Shibanov, Yuri, Lundqvist, Natalia, Lundqvist, Peter, Sollerman, Jesper, Zyuzin, Dmitri
We have performed a deep optical imaging of 3C 58 SNR with the NOT in the B and V bands to detect the optical counterpart of the associated pulsar J0295+6449 and its torus-like wind nebula visible in...
The Structure of the Circumstellar Gas of SN 1987A (2007)
Peter Lundqvist, George Sonneborn
. Recent observations of the rings around SN 1987A are discussed and modeled, with particular emphasis on HST observations of the inner ring by the SINS 1 team. It is found that the lowest density...
Hughes, John P., Chugai, Nikolai, Chevalier, Roger, Lundqvist, Peter, Schlegel, Eric
We set sensitive upper limits to the X-ray emission of four Type Ia supernovae (SNe Ia) using the Chandra X-ray Observatory. SN 2002bo, a normal, although reddened, nearby SN Ia, was observed 9.3...
Gerardy, Christopher L., Meikle, W. P. S., Kotak, Rubina, Höflich, Peter, Farrah, Duncan, Filippenko, Alexei V., ...
We present mid-infrared (5.2-15.2 μm) spectra of the Type Ia supernovae (SNe Ia) 2003hv and 2005df observed with the Spitzer Space Telescope. These are the first observed mid-infrared spectra of...
Groeningsson, Per, Fransson, Claes, Lundqvist, Peter, Lundqvist, Natalia, Leibundgut, Bruno, Spyromilio, Jason, ...
We discuss high resolution VLT/UVES observations (FWHM ~ 6 km/s) from October 2002 (day ~5700 past explosion) of the shock interaction of SN 1987A and its circumstellar ring. A nebular analysis of...
Gerardy, Christopher L., Meikle, W. P. S., Kotak, Rubina, Hoeflich, Peter, Farrah, Duncan, Filippenko, Alexei V., ...
We present the first mid-infrared (5.2-15.2 micron) spectra of Type Ia supernovae (SNe 2003hv and 2005df). The detection of Ni emission in SN 2005df 135 days after the explosion provides direct...
Spitzer measurements of atomic and molecular abundances in the Type IIP SN 2005af (2006)
Kotak, Rubina, Meikle, Peter, Pozzo, Monica, Van Dyk, Schuyler D., Farrah, Duncan, Fesen, Robert, ...
We present results based on Spitzer Space Telescope mid-infrared (3.6-30 micron) observations of the nearby IIP supernova 2005af. We report the first ever detection of the SiO molecule in a Type IIP...
Coronal emission from the shocked circumstellar ring of SN 1987A (2006)
Groeningsson, Per, Fransson, Claes, Lundqvist, Peter, Nymark, Tanja, Lundqvist, Natalia, Chevalier, Roger, ...
High resolution spectra with UVES/VLT of SN 1987A from December 2000 until November 2005 show a number of high ionization lines from gas with velocities of roughly 350 km/s, emerging from the shocked...
Evolution of the Reverse Shock Emission from SNR 1987A (2006)
Heng, Kevin, McCray, Richard, Zhekov, Svetozar A., Challis, Peter M., Chevalier, Roger A., Crotts, Arlin P. S., ...
We present new (2004 July) G750L and G140L Space Telescope Imaging Spectrograph (STIS) data of the H-alpha and Ly-alpha emission from supernova remnant (SNR) 1987A. With the aid of earlier data, from...
Fransson, Claes, Challis, Peter M., Chevalier, Roger A., Filippenko, Alexei V., Kirshner, Robert P., Kozma, Cecilia, ...
Ground-based and Hubble Space Telescope observations are presented for SN 1993J and SN 1998S. SN 1998S shows strong, relatively narrow circumstellar emission lines of N III-V and C III-IV, as well as...
The late-time light curve of the Type Ia supernova 2000cx (2004)
Sollerman, Jesper, Lindahl, Jan, Kozma, Cecilia, Challis, Peter, Filippenko, Alexei V., Fransson, Claes, ...
We have conducted a systematic and comprehensive monitoring programme of the Type Ia supernova 2000cx at late phases using the VLT and HST. The VLT observations cover phases 360 to 480 days past...
Diffuse Interstellar Bands in NGC 1448 (2004)
Sollerman, Jesper, Cox, Nick, Mattila, Seppo, Ehrenfreund, Pascale, Kaper, Lex, Leibundgut, Bruno, ...
We present spectroscopic VLT/UVES observations of two emerging supernovae, the Type Ia SN 2001el and the Type II SN 2003hn, in the spiral galaxy NGC 1448. Our high resolution and high signal-to-noise...
The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope (2004)
Chugai, Nikolai N., Blinnikov, Sergei I., Cumming, Robert J., Lundqvist, Peter, Bragaglia, Angela, Filippenko, Alexei V., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 203 days after explosion. During the luminous phase (first 100 d) the line profiles are composed of three major...
SN 1994W: evidence of explosive mass ejection a few years before explosion (2003)
Chugai, Nikolai N., Cumming, Robert J., Blinnikov, Sergei I., Lundqvist, Peter, Filippenko, Alexei V., Barth, Aaron J., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 202 days after explosion. During the first 100 days the line profiles are composed of three major components:...
High-resolution optical studies of nearby Type Ia supernovae (2003)
Lundqvist, Peter, Mattila, Seppo, Sollerman, Jesper, Baron, E., Ehrenfreund, Pascale, Fransson, Claes, ...
Since April 2000, a program using the ESO/VLT/UVES to search for early circumstellar signatures from nearby supernovae has been conducted. Until now, two Type Ia supernovae have been observed, SNe...
Sollerman, Jesper, Ghavamian, Parviz, Lundqvist, Peter, Smith, R. Chris
We report results from high resolution optical spectroscopy of three non-radiative galactic supernova remnants, RCW 86, Kepler's supernova remnant and SN 1006. We have measured the narrow component...
Spectropolarimetry of SN 2001el in NGC 1448: Asphericity of a Normal Type Ia Supernova (2003)
Wang, Lifan, Baade, Dietrich, Hoeflich, Peter, Khokhlov, Alexei, Wheeler, J. Craig, Kasen, Daniel, ...
High-quality spectropolarimetry (range 417-860 nm; spectral resolution 1.27 nm and 0.265 nm/pixel) of the SN Ia 2001el were obtained with the ESO Very Large Telescope Melipal (+ FORS1) at 5 epochs....
The dusty type IIn Supernova 1998S (2002)
Meikle, Peter, Fassia, Alexandra, Geballe, Thomas R., Lundqvist, Peter, Chugai, Nikolai, Farrah, Duncan, ...
The type IIn SN 1998S is one of the most remarkable core-collapse supernovae ever observed. It underwent a complex interaction with a substantial circumstellar medium, resulting in radiation at...
Stellar wind bubbles around WR and [WR] stars (2002)
Mellema, Garrelt, Lundqvist, Peter
We study the dynamics of stellar wind bubbles around hydrogen-deficient stars using numerical simulations with time- and ion dependent cooling. We consider two types of hydrogen-deficient stars,...
Wang, Lifan, Baade, Dietrich, Hoeflich, Peter, Wheeler, J. Craig, Fransson, Claes, Lundqvist, Peter
High-quality spectropolarimetric data of SN 2002ap were obtained with the ESO Very Large Telescope Melipal (+ FORS1) at 3 epochs that correspond to -6, -2, and +1 days for a V maximum of 9 Feb 2002....
Detailed spectroscopic analysis of SN 1987A: The distance to the LMC using the SEAM method (2002)
Mitchell, Robert C., Baron, E., Branch, David, Hauschildt, Peter H., Nugent, Peter E., Lundqvist, Peter, ...
Supernova 1987A remains the most well-studied supernova to date. Observations produced excellent broad-band photometric and spectroscopic coverage over a wide wavelength range at all epochs. We model...
Detailed Spectroscopic Analysis of SN 1987A: The Distance to the LMC using the SEAM method (2002)
Mitchell, Robert C., Baron, E., Branch, David, Hauschildt, Peter H., Nugent, Peter E., Lundqvist, Peter, ...
Supernova 1987A remains the most well-studied supernova to date. Observations produced excellent broad-band photometric and spectroscopic coverage over a wide wavelength range at all epochs. We model...
Pun, Chun S. J., Michael, Eli, Zhekov, Svetozar A., McCray, Richard, Garnavich, Peter M., Challis, Peter M., ...
We report and interpret HST/STIS long-slit observations of the optical and ultraviolet (1150 - 10270 Angstrom) emission-line spectra of the rapidly brightening Spot 1 on the equatorial ring of SN...
Fransson, Claes, Chevalier, Roger A., Filippenko, Alexei V., Leibundgut, Bruno, Barth, Aaron J., Fesen, Robert A., ...
Optical and ultraviolet observations of the Type IIn supernova 1995N at epochs between 321 and 1799 days after the explosion show three distinct velocity components. The narrow lines come from...
Nickel Mixing in the Outer Layers of SN 1987A (2001)
Mitchell, Robert C., Baron, E., Branch, David, Lundqvist, Peter, Blinnikov, Sergei, Hauschildt, Peter H., ...
Supernova 1987A remains the most well-observed and well-studied supernova to date. Observations produced excellent broad-band photometric and spectroscopic coverage over a wide wavelength range at...
Why did Supernova 1054 shine at late times? (2000)
Sollerman, Jesper, Kozma, Cecilia, Lundqvist, Peter
The Crab nebula is the remnant of supernova 1054 (SN 1054). The progenitor of this supernova has, based on nucleosynthesis arguments, been modeled as an 8-10 solar mass star. Here we point out that...
Preliminary Spectral Analysis of the Type II Supernova 1999em (2000)
Baron, E., Branch, David, Hauschildt, Peter H., Filippenko, Alexei V., Kirshner, R. P., Challis, P. M., ...
We have calculated fast direct spectral model fits to two early-time spectra of the Type-II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely early blue optical...
Lentz, Eric J., Baron, E., Lundqvist, Peter, Branch, David, Hauschildt, Peter H., Fransson, Claes, ...
We present spectral analysis of early observations of the Type IIn supernova 1998S using the general non-local thermodynamic equilibrium atmosphere code \tt PHOENIX}. We model both the underlying...
Physical Conditions in Circumstellar Gas surrounding SN 1987A 12 Years After Outburst (2000)
Maran, Stephen P., Sonneborn, George, Pun, Chun S. J., Lundqvist, Peter, Iping, Rosina C., Gull, Theodore R.
Two-dimensional spectra of Supernova 1987A were obtained on 1998 November 14-15 (4282 days after outburst) with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope...
HST Spectroscopy of Spot 1 on the Circumstellar Ring of SN 1987A (2000)
Michael, Eli, McCray, Richard, Pun, C. S. J., Garnavich, Peter, Challis, Peter, Kirshner, Robert P., ...
We present ultraviolet and optical spectra of the first bright spot (PA = 29 degrees) on Supernova 1987A's equatorial circumstellar ring taken with the Space Telescope Imaging Spectrograph. We...
SN 1998bw at late phases (2000)
Sollerman, Jesper, Kozma, Cecilia, Fransson, Claes, Leibundgut, Bruno, Lundqvist, Peter, Ryde, Felix, ...
We present observations of the peculiar supernova SN 1998bw, which was probably associated with GRB 980425. The photometric and spectroscopic evolution is monitored up to 500 days past explosion. We...
Observations of the Crab Nebula and its pulsar in the far-ultraviolet and in the optical (2000)
Sollerman, Jesper, Lundqvist, Peter, Lindler, Don, Chevalier, Roger A., Fransson, Claes, Gull, Theodore R., ...
We present HST/STIS far-UV observations of the Crab nebula and its pulsar. Broad, blueshifted absorption arising in the nebula is seen in C IV 1550, reaching about 2500 km/s. This can be interpreted...
Blinnikov, Sergei, Lundqvist, Peter, Bartunov, Oleg, Nomoto, Ken'ichi, Iwamoto, Koichi
The optical/UV light curves of SN 1987A are analyzed with the multi-energy group radiation hydrodynamics code STELLA. The calculated monochromatic and bolometric light curves are compared with...
Type II supernovae at high redshifts (1999)
Chugai, Nikolai, Blinnikov, Sergei, Lundqvist, Peter
A hydro code coupled with radiation transfer was applied to produce monochromatic light curves of two models of type II supernovae (SN II) simulating SN II-P and SN IIb (SN 1993J-like). We then used...
Deep optical observations at the position of PSR1706-44 with the VLT-UT1 (1998)
Lundqvist, Peter, Sollerman, Jesper, Ray, Alak, Leibundgut, Bruno, Sutaria, Firoza
We present optical data gathered by the VLT Test Camera in the V-band at the radio (interferometric) position of PSR1706-44. We find no optical counterpart to the pulsar in the VLT image. At a...
Flash ionization of the partially ionized wind of the progenitor of SN 1987A (1998)
The H II region created by the progenitor of SN 1987A was further heated and ionized by the supernova flash. Prior to the flash, the temperature of the gas was 4000 - 5000 K, and helium was neutral,...
STIS Near Ultraviolet Time-Tagged Spectra of the Crab Pulsar (1997)
Gull, Theodore R., Lindler, Don J., Crenshaw, D. Michael, Dolan, Joseph F., Hulbert, Stephen J., Kraemer, Steven B., ...
We present the spectrum and pulse profile of the Crab Pulsar in the near ultraviolet (1600-3200 Angstroms) observed with the Space Telescope Imaging Spectrograph (STIS) during the Hubble Space...
Photo-evaporation of clumps in Planetary Nebulae (1997)
Mellema, Garrelt, Raga, Alejandro C., Canto, Jorge, Lundqvist, Peter, Balick, Bruce, Steffen, Wolfgang, ...
We study the evolution of dense neutral clumps located in the outer parts of planetary nebulae. These clumps will be photo-ionized by the ionizing radiation from the central star and change their...
A very low mass of Ni-56 in the ejecta of SN 1994W (1997)
Sollerman, Jesper, Cumming, Robert J., Lundqvist, Peter
We present spectroscopic and photometric observations of the luminous narrow- line Type IIP (plateau) supernova 1994W. After the plateau phase (t >120 days), the light curve dropped by 3.5 mag in V...
The structure of the circumstellar gas of SN 1987A (1997)
Lundqvist, Peter, Sonneborn, George
Recent observations of the rings around SN 1987A are discussed and modeled, with particular emphasis on HST observations of the inner ring by the SINS team (P.I.: R. P. Kirshner). It is found that...
Supernova progenitor constraints from circumstellar interaction: Type Ia (1996)
Lundqvist, Peter, Cumming, Robert J.
Searching for the presence of a circumstellar medium is a direct observational way to discriminate between different types of progenitor systems for Type Ia supernovae. We have modeled whether such...
Supernova progenitor constraints from circumstellar interaction: Type II (1996)
Cumming, Robert J., Lundqvist, Peter
All types of supernovae (SNe), except Type Ia, have been observed to interact with their immediate circumstellar medium (CSM). This interaction can reveal their progenitor's histories, and constrain...