0000000000053911

AUTHOR

Stefan Immler

showing 4 related works from this author

Light Curves of Radio Supernovae

2007

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 supernovae, we present their radio light-curves. From these data we are able to discuss parameterizations and modeling and make predictions of the nature of the progenitors based on previous research. Derived mass loss rates assume wind-established circumstellar medium, shock velocity ~10,000 km/s, wind velocity ~10 km/s, and CSM Temperature ~10,000 K.

Very large arrayPhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)AstronomyFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysicsLight curveWind speedShock (mechanics)SupernovaAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Galaxy AstrophysicsAIP Conference Proceedings
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Radio Insight into the Nature of Type IIb Progenitors

2011

AbstractWe present the results of over two decades of radio observations of type IIb Supernovae with the Very Large Array and the Australia Telescope Compact Array. These radio studies illustrate the need for multi-wavelength follow-up to determine the progenitor scenario for type IIb events.

TelescopePhysicsVery large arraySupernovaType iibSpace and Planetary SciencelawAstronomyAstronomy and AstrophysicsProgenitor celllaw.inventionProceedings of the International Astronomical Union
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Recent Type II Radio Supernovae

2007

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 multi-frequency observations of each supernova. We compare the observed and derived radio properties of these supernovae by optical classification and discuss the implications.

PhysicsVery large arraySupernovaAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)Parameterized complexityFOS: Physical sciencesAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysicsAstrophysics::Galaxy AstrophysicsAIP Conference Proceedings
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23 GHz VLBI Observations of SN 2008ax

2009

We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax, made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux density recovered from our VLBI image is 0.8$\pm$0.3 mJy (one standard deviation). As it appears, the structure may be interpreted as either a core-jet or a double source. However, the supernova structure could be somewhat confused with a possible close by noise peak. In such a case, the recovered flux density would decrease to 0.48$\pm$0.12 mJy, compatible with the flux densities measured with…

PhysicsImage (category theory)FluxFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics - Astrophysics of GalaxiesStandard deviationSupernovaSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)Very-long-baseline interferometryEjectaVery Long Baseline ArrayNoise (radio)
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