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Calibrating Type Ia Supernovae using the Planetary Nebula Luminosity Function I. Initial Results
John J. Feldmeier, George H. Jacoby, Mark M. Phillips
We report the results of an [O III] lambda 5007 survey for planetary nebulae (PN) in five galaxies that were hosts of well-observed Type Ia supernovae: NGC 524, NGC 1316, NGC 1380,…
A Spectacular Radio Flare from XRF 050416a at 40 days and Implications for the Nature of X-ray Flashes
A. M. Soderberg, E. Nakar, S. B. Cenko +26
We present detailed optical, near-infrared, and radio observations of the X-ray flash 050416a obtained with Palomar and Siding Springs Observatories as well as HST and the VLA, pla…
The Joint Efficient Dark-energy Investigation (JEDI): Measuring the cosmic expansion history from type Ia supernovae
M. M. Phillips, Peter Garnavich, Yun Wang +6
JEDI (Joint Efficient Dark-energy Investigation) is a candidate implementation of the NASA-DOE Joint Dark Energy Mission (JDEM). JEDI will probe dark energy in three independent me…
Abundances of s-process elements in planetary nebulae: Br, Kr & Xe
Y. Zhang, R. Williams, E. Pellegrini +5
We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhanc…
Optical and Near-Infrared Observations of the Peculiar Type Ia Supernova 1999ac
Mark M. Phillips, Kevin Krisciunas, Nicholas B. Suntzeff +29
We present 39 nights of optical photometry, 34 nights of infrared photometry, and 4 nights of optical spectroscopy of the Type Ia SN 1999ac. This supernova was discovered two weeks…
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts
Gaston Folatelli, Carlos Contreras, M. M. Phillips +22
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-p…