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Eleven years of radio monitoring of the Type IIn supernova SN 1995N
Poonam Chandra, Christopher J. Stockdale, Roger A. Chevalier +6
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array (VLA) for 11 years. We also obs…
On the Progenitors of Two Type II-P Supernovae in the Virgo Cluster
Weidong Li, Xiaofeng Wang, Schuyler D. Van Dyk +3
Direct identification of the progenitors of supernovae (SNe) is rare because of the required spatial resolution and depth of the archival data prior to the SN explosions. Here we r…
Signatures of Delayed Detonation, Asymmetry, and Electron Capture in the Mid-Infrared Spectra of Supernovae 2003hv and 2005df
Christopher L. Gerardy, W. P. S. Meikle, Rubina Kotak +10
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 pr…
Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
Margaret Meixner, Karl D. Gordon, Remy Indebetouw +46
We are performing a uniform and unbiased, ~7x7 degrees imaging survey of the Large Magellanic Cloud (LMC), using the IRAC and MIPS instruments on board the Spitzer Space Telescope…
A Search for Radio Emission from Type Ia Supernovae
Nino Panagia, Schuyler D. Van Dyk, Kurt W. Weiler +3
We present and discuss the radio observations of 27 Type Ia supernovae (SNe Ia) observed over two decades with the Very Large Array. No SN Ia has been detected so far in the radio,…
Optical Photometry and Spectroscopy of the SN 1998bw-like Type Ic Supernova 2002ap
Ryan J. Foley, Marina S. Papenkova, Brandon J. Swift +6
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…
The Progenitor of Supernova 1993J Revisited
S. D. Van Dyk, P. M. Garnavich, A. V. Filippenko +4
From Hubble Space Telescope images with 0.05" resolution we identify four stars brighter than V=25 mag within 2.5" of SN 1993J in M81 which contaminated previous ground-based brigh…
Radio Emission from SN 1988Z and Very Massive Star Evolution
C. L. Williams, N. Panagia, S. D. Van Dyk +3
We present observations of the radio emission from the unusual SN 1988Z made with the VLA from 385 to 4,438 days after explosion. SN 1988Z is the most distant radio supernova ever…
Possible Recovery of SN 1961V In Hubble Space Telescope Archival Images
Schuyler D. Van Dyk, Alexei V. Filippenko, Weidong Li
SN 1961V in NGC 1058 was originally classified by Fritz Zwicky as a ``Type V'' supernova. However, it has been argued that SN 1961V was not a genuine supernova, but instead the sup…
Narrow Lines in Type II Supernovae -- Probing the Circumstellar Nebulae of the Progenitors
Robert A. Gruendl, You-Hua Chu, Schuyler D. Van Dyk +1
We have carried out a high-dispersion (R~30,000) echelle spectroscopic survey of 16 Type II supernovae (SNe) to search for narrow emission lines from circumstellar nebulae ejected…
Strongly decelerated expansion of SN1979C
J. M. Marcaide, M. A. Perez-Torres, E. Ros +6
We observed SN1979C in M100 on 4 June 1999, about twenty years after explosion, with a very sensitive four-antenna VLBI array at the wavelength of 18cm. The distance to M100 and th…
A Hubble Space Telescope Snapshot Survey of Nearby Supernovae
Weidong Li, Alexei V. Filippenko, Schuyler D. Van Dyk +4
We present photometry of 12 recent supernovae (SNe) recovered in a {\it Hubble Space Telescope} Snapshot program, and tie the measurements to earlier ground-based observations, in…
Evidence for Blow-out in the Low-mass Dwarf Galaxy Holmberg I
Juergen Ott, Fabian Walter, Elias Brinks +3
We present radio and optical observations of Holmberg I (HoI), a member of the M81 group of galaxies (distance 3.6Mpc). HoI is a low-mass, low surface- brightness dwarf galaxy. Hig…
MSX, 2MASS, and the LMC: A Combined Near and Mid Infrared View
Michael P. Egan, Schuyler D. Van Dyk, Stephan D. Price
The Large Magellanic Cloud (LMC) has been observed by both the Midcourse Space Experiment (MSX) in the mid-infrared and the Two Micron All Sky Survey (2MASS) in the near-infrared.…
Optical and Ultraviolet Spectroscopy of SN 1995N: Evidence for Strong Circumstellar Interaction
Claes Fransson, Roger A. Chevalier, Alexei V. Filippenko +9
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 lin…
BVRI Photometry of Supernovae
Wynn C. G. Ho, Schuyler D. Van Dyk, Chien Y. Peng +5
We present optical photometry of one Type IIn supernova (1994Y) and nine Type Ia supernovae (1993Y, 1993Z, 1993ae, 1994B, 1994C, 1994M, 1994Q, 1994ae, and 1995D). SN 1993Y and SN 1…
X-ray, Optical, and Radio Observations of the Type II Supernovae 1999em and 1998S
D. Pooley, W. H. G. Lewin, D. W. Fox +12
Observations of the Type II-P (plateau) Supernova (SN) 1999em and Type IIn (narrow emission line) SN 1998S have enabled estimation of the profile of the SN ejecta, the structure of…
Radio Continuum Imaging of the Spiral Galaxy NGC 4258
Scott D. Hyman, Daniel Calle, Kurt W. Weiler +3
We analyze 3."5 resolution, high sensitivity radio continuum images of the nearby spiral galaxy NGC 4258 at 6 and 20 cm derived from multiple observations used to monitor the radio…
SN 1997bs in M66: Another Extragalactic Eta Carinae Analog?
S. D. Van Dyk, C. Y. Peng, J. Y. King +4
We report on SN 1997bs in NGC 3627 (M66), the first supernova discovered by the Lick Observatory Supernova Search using the 0.75-m Katzman Automatic Imaging Telescope (KAIT). Based…
The X-ray Spectrum and Light Curve of Supernova 1995N
D. W. Fox, W. H. G. Lewin, A. Fabian +10
We report on multi-epoch X-ray observations of the Type IIn (narrow emission line) supernova SN 1995N with the ROSAT and ASCA satellites. The January 1998 ASCA X-ray spectrum is we…
Radio Observations of SN 1979C: Evidence for Rapid Presupernova Evolution
Marcos J. Montes
We present new radio observations of the supernova SN 1979C made with the VLA at 20, 6, 3.6, and 2 cm from 1991 July to 1998 October, which extend our previously published observat…
The Environments of Supernovae in Post-Refurbishment Hubble Space Telescope Images
S. D. Van Dyk, C. Y. Peng, A. J. Barth +1
The locations of supernovae in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. Access to this information, however, has bee…
Discovery of Radio Outbursts in the Active Nucleus of M81
Luis C. Ho, Schuyler D. Van Dyk, Guy G. Pooley +2
The low-luminosity active galactic nucleus of M81 has been monitored at centimeter wavelengths since early 1993 as a by-product of radio programs to study the radio emission from S…
Detection of Pre-Shock Dense Circumstellar Material of SN 1978K
You-Hua Chu, Adeline Caulet, Marcos Montes +3
The supernova SN 1978K has been noted for its lack of emission lines broader than a few thousand km/s since its discovery in 1990. Modeling of the radio spectrum of the peculiar SN…