12 New Galactic Wolf-Rayet Stars Identified via 2MASS+Spitzer/GLIMPSE (2009)
Mauerhan, Jon C., Van Dyk, Schuyler D., Morris, Pat W.
We report new results from our effort to identify obscured Wolf-Rayet stars in the Galaxy. Candidates were selected by their near-infrared (2MASS) and mid-infrared (Spitzer/GLIMPSE) color excesses,...
Radio Supernovae: Circum-Stellar Investigation (C.S.I.) of Supernova Progenitor Stars (2009)
Stockdale, Christopher J., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., Immler, Stefan, ...
Prior to explosion, a supernova progenitor slowly loses significant amounts of its hydrogen envelope in a stellar wind. After the explosion, the blastwave interacts with this wind producing...
Type II Supernovae as Probes of Cosmology (2009)
Poznanski, Dovi, Baron, Eddie, Blondin, Stephane, Bloom, Joshua S., D'Andrea, Christopher B., Della Valle, Massimo, ...
- Constraining the cosmological parameters and understanding Dark Energy have tremendous implications for the nature of the Universe and its physical laws. - The pervasive limit of systematic...
Eleven Years of Radio Monitoring of the type IIn Supernova SN 1995N (2009)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
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 for 11 years. We also observed it at low radio...
Eleven years of radio monitoring of the Type IIn supernova SN 1995N (2008)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
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 observed it at low...
Long-Term Radio Monitoring of SN 1993J (2007)
Weiler, Kurt W., Williams, Christopher L., Panagia, Nino, Stockdale, Christopher J., Kelley, Matthew T., Sramek, Richard A., ...
We present our extensive observations of the radio emission from supernova (SN) 1993J, in M81 (NGC 3031), made with the Very Large Array, at 90, 20, 6, 3.6, 2, 1.2, and 0.7 cm, as well as numerous...
Long Term Radio Monitoring of SN 1993J (2007)
Weiler, Kurt W., Williams, Christopher L., Panagia, Nino, Stockdale, Christopher J., Kelley, Matthew T., Sramek, Richard A., ...
We present our observations of the radio emission from supernova (SN) 1993J, in M 81 (NGC 3031), made with the VLA, from 90 to 0.7 cm, as well as numerous measurements from other telescopes. The...
Radio Observations of Supernovae (2007)
Panagia, Nino, Weiler, Kurt W., Van Dyk, Schuyler D., Sramek, Richard A., Stockdale, Christopher J.
Study of radio supernovae over the past 25 years includes two dozen detected objects and more than 100 upper limits. From this work it is possible to identify classes of radio properties, demonstrate...
Light Curves of Radio Supernovae (2007)
Kelley, Matthew T., Stockdale, Christopher J., Weiler, Kurt W., Williams, Christopher L. M., Panagia, Nino, Sramek, Richard A., ...
We present the results from the on-going radio monitoring of recent type II supernovae (SNe), including SNe 2004et, 2004dj, 2002hh, 2001em, and 2001gd. Using the Very Large Array to monitor these...
Recent Type II Radio Supernovae (2007)
Stockdale, Christopher J., Kelley, Matthew T., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Marcaide, J. M., ...
We present the results of radio observations, taken primarily with the Very Large Array, of Supernovae 1993J, 2001gd, 2001em, 2002hh, 2004dj, and 2004et. We have fit a parameterized model to the...
The Radio Evolution of SN 2001gd (2007)
Stockdale, Christopher J., Williams, Christopher L., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., ...
We present the results of observations of the radio emission from Supernova 2001gd in NGC 5033 from 2002 February 8 through 2006 September 25. The data were obtained using the Very Large Array at...
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...
Radio Observations of Supernovae (2007)
Panagia, Nino, Weiler, Kurt W., Van Dyk, Schuyler D., Sramek, Richard A., Stockdale, Christopher J.
Study of radio supernovae over the past 25 years includes two dozen detected objects and more than 100 upper limits. From this work it is possible to identify classes of radio properties, demonstrate...
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...
On the Progenitors of Two Type II-P Supernovae in the Virgo Cluster (2007)
Li, Weidong, Wang, Xiaofeng, Van Dyk, Schuyler D., Cuillandre, Jean-Charles, Foley, Ryan J., Filippenko, Alexei V.
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 report on the...
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...
A Search for Radio Emission from Type Ia Supernovae (2006)
Panagia, Nino, Van Dyk, Schuyler D., Weiler, Kurt W., Sramek, Richard A., Stockdale, Christopher J., Murata, Kimberly P.
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, implying a very...
The Type IIn Supernova 2002kg: The Outburst of a Luminous Blue Variable Star in NGC 2403 (2006)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V., Humphreys, Roberta M., Chornock, Ryan, Foley, Ryan, ...
We show that Supernova (SN) 2002kg in NGC 2403, initially classified as Type II-narrow (IIn), has photometric and spectroscopic properties unlike those of normal SNe. Its behavior, instead, is more...
The Light Echo Around Supernova 2003gd in Messier 74 (2005)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
We confirm the discovery of a light echo around the Type II-plateau Supernova 2003gd in Messier 74 (NGC 628), seen in images obtained with the High Resolution Channel of the Advanced Camera for...
Li, Weidong, Van Dyk, Schuyler D., Filippenko, Alexei V., Cuillandre, Jean-Charles, Jha, Saurabh, Bloom, Joshua S., ...
The stars that end their lives as supernovae (SNe) have been directly observed in only a handful of cases, due mainly to the extreme difficulty in identifying them in images obtained prior to the SN...
Late-time X-Ray, UV and Optical Monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
We present results from observations of SN 1979C with XMM-Newton in X-rays and in the UV, archival X-ray and HST data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows...
Searching for Progenitors of Core-Collapse Supernovae (2005)
Identifying the massive progenitor stars that give rise to core-collapse supernovae is one of the main pursuits of supernova and stellar evolution studies. In this talk I discuss some aspects of the...
Late-time X-ray, UV, and optical monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
On the Progenitor of the Type II Supernova 2004et in NGC 6946 (2004)
Li, Weidong, Van Dyk, Schuyler D., Filippenko, Alexei V., Cuillandre, Jean-Charles
Supernova (SN) 2004et is the eighth historical SN in the nearby spiral galaxy NGC 6946. Here we report on early photometric and spectroscopic monitoring of this object. SN 2004et is a Type II event,...
MERLIN and VLA Observations of VII Zw 19: Distant Cousin of M82 (2004)
Beck, Sara C., Garrington, S. T., Turner, Jean L., Van Dyk, Schuyler D.
We have observed the starburst dwarf galaxy VII Zw 19 at subarcsecond resolution with the MERLIN and MERLIN+EVN networks at 18 cm, with MERLIN at 6 cm, and with the VLA in A array at 6 and 2 cm. The...
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....
Radio Emission from SN 2001gd in NGC 5033 (2003)
Stockdale, Christopher J., Weiler, Kurt W., Van Dyk, Schuyler D., Montes, Marcos J., Panagia, Nino, Sramek, Richard A., ...
We present the results of monitoring the radio emission from the Type IIb supernova SN 2001gd between 2002 February 8 and 2002 October 28. Most of the data were obtained using the Very Large Array at...
On the Progenitor of Supernova 2001du in NGC 1365 (2003)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
Hubble Space Telescope (HST) WFPC2 archival images obtained years prior to the explosion of the Type II-plateau supernova (SN) 2001du in NGC 1365 previously have been analyzed to isolate the...
A Search for Core-Collapse Supernova Progenitors In Hubble Space Telescope Images (2002)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
Identifying the massive progenitor stars that give rise to core-collapse supernovae (SNe) is one of the main pursuits of supernova and stellar evolution studies. Using ground-based images of recent,...
Leonard, Douglas C., Filippenko, Alexei V., Li, Weidong, Matheson, Thomas, Kirshner, Robert P., Chornock, Ryan, ...
We present optical spectra and photometry sampling the first six months after discovery of supernova (SN) 1999gi in NGC 3184. SN 1999gi is shown to be a Type II-plateau event with a photometric...
Possible Recovery of SN 1961V In Hubble Space Telescope Archival Images (2002)
Van Dyk, Schuyler D., Filippenko, Alexei V., Li, Weidong
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 superoutburst of an...
A Hubble Space Telescope Snapshot Survey of Nearby Supernovae (2002)
Li, Weidong, Filippenko, Alexei V., Van Dyk, Schuyler D., Hu, Jingyao, Qiu, Yulei, Modjaz, Maryam, ...
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 order to study the...
Narrow Lines in Type II Supernovae -- Probing the Circumstellar Nebulae of the Progenitors (2002)
Gruendl, Robert A., Chu, You-Hua, Van Dyk, Schuyler D., Stockdale, Christopher J.
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 by their massive...
Evidence for Blow-out in the Low-mass Dwarf Galaxy Holmberg I (2001)
Ott, Juergen, Walter, Fabian, Brinks, Elias, Van Dyk, Schuyler D., Dirsch, Boris, Klein, Ulrich
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. High-resolution...
BVRI Photometry of Supernovae (2001)
Ho, Wynn C. G., Van Dyk, Schuyler D., Peng, Chien Y., Filippenko, Alexei V., Leonard, Douglas C., Matheson, Thomas, ...
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 1993Z appear to be...
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...
MSX, 2MASS, and the LMC: A Combined Near and Mid Infrared View (2001)
Egan, Michael P., Van Dyk, Schuyler D., Price, Stephan D.
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. We have performed a...
Radio Continuum Imaging of the Spiral Galaxy NGC 4258 (2001)
Hyman, Scott D., Calle, Daniel, Weiler, Kurt W., Lacey, Christina K., Van Dyk, Schuyler D., Sramek, Richard
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 supernova SN 1981K...
Radio Supernovae and GRB 980425 (2000)
Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., Montes, Marcos J., Lacey, Christina K.
Study of radio supernovae (RSNe) over the past 20 years includes two dozen detected objects and more than 100 upper limits. From this work we are able to identify classes of radio properties,...
Discovery of Radio Outbursts in the Active Nucleus of M81 (1999)
Ho, Luis C., Van Dyk, Schuyler D., Pooley, Guy G., Sramek, Richard A., Weiler, Kurt W.
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 Supernova 1993J. The...
Late-Time Optical and UV Spectra of SN 1979C and SN 1980K (1998)
Fesen, Robert A., Gerardy, Christopher L., Filippenko, Alexei V., Matheson, Thomas, Chevalier, Roger A., Kirshner, Robert P., ...
A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8 yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad 5500 km s^{-1} emission lines of H\alpha, [O...
Hubble Space Telescope WFPC2 Imaging of SN 1979C and Its Environment (1998)
Van Dyk, Schuyler D., Peng, Chien Y., Barth, Aaron J., Filippenko, Alexei V., Chevalier, Roger A., Fesen, Robert A., ...
The locations of supernovae in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. As part of a program to study the environments of supernovae...
Recent Star Formation in Sextans A (1998)
Van Dyk, Schuyler D., Puche, Daniel, Wong, Tony
We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. This galaxy is currently...
Radio Observations of SN 1980K: Evidence for Rapid Presupernova Evolution (1998)
Montes, Marcos J., Van Dyk, Schuyler D., Weiler, Kurt W., Sramek, Richard A., Panagia, Nino
New observations of SN 1980K made with the VLA at 20 and 6 cm from 1994 April through 1996 October show that the supernova (SN) has undergone a significant change in its radio emission evolution,...