Journal Article10.1126/SCIENCE.270.5241.1452
An Exploding Star in Motion
TL;DR: In this paper, a recently discovered supernova, designated SN 1993J, has been imaged with exceptional resolution with a sensitive array of radiotelescopes, and the imaging results reported by Marcaide et al. in this issue directly show the expansion of a highly symmetrical spherical shock wave.
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Abstract: A recently discovered supernova, designated SN 1993J, has been imaged with exceptional resolution with a sensitive array of radiotelescopes. As Chevalier discusses in his Perspective, the imaging results reported by Marcaide et al. in this issue (p. 1475) directly show the expansion of a highly symmetrical spherical shock wave. Variations in radio emission around the expanding shell may enable astronomers to learn more about these very energetic explosions.
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References
The radio and X-ray emission from type II supernovae.
TL;DR: In this paper, the authors derived the equation of motion of a supernova shell based on the approximations that the shell is thin and that the supernova density profile is a power law in radius.
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Expansion of SN 1993J
J. M. Marcaide,A. Alberdi,Eduardo Ros,P. Diamond,Irwin I. Shapiro,J. C. Guirado,Dayton L. Jones,Thomas P. Krichbaum,F. Mantovani,Robert A. Preston,Antonio Rius,Richard Schilizzi,Corrado Trigilio,Alan R. Whitney,A. Witzel +14 more
TL;DR: In this article, a sequence of images from very long baseline interferometry shows that the young radio supernova SN 1993J is expanding with circular symmetry, however, the circularly symmetric images show emission asymmetries.
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Hubble's constant determined using very-long baseline interferometry of a supernova
Norbert Bartel,Alan E. E. Rogers,Irwin I. Shapiro,M. V. Gorenstein,C. R. Gwinn,J. M. Marcaide,J. M. Marcaide,Kurt W. Weiler,Kurt W. Weiler +8 more
TL;DR: In this paper, the angular expansion velocity of the radiosphere of the supernova SN1979c in the galaxy Ml00 in the Virgo cluster, combined with determination of the radial acceleration of the photosphere, yields an estimate of the distance to the Virga cluster center of Dvirgo = 19+8−6 Mpc and of the Hubble constant of H0=65+35−25 km s−1 Mpc−1, where the uncertainties given are based on conservative, but reasonable estimates of all significant errors and are intended to represent 90% confidence intervals.
Spectropolarimetry of SN 1993J in NGC 3031
TL;DR: In this article, the authors obtained low-resolution optical spectropolarimetry of SN 1993J which shows a high continuum linear polarization and a 05% drop in polarization across the Ha emission line accompanied by a ∼15° position angle rotation.