Roger A. Chevalier
University of Virginia
288 Papers
3K Citations
Roger A. Chevalier is an academic researcher from University of Virginia. The author has contributed to research in topics: Supernova & Supernova remnant. The author has an hindex of 87, co-authored 284 publications. Previous affiliations of Roger A. Chevalier include Kitt Peak National Observatory & Advanced Technology Center.
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Papers
A mid-life crisis? sudden changes in radio and x-ray emission from supernova 1970g
Jason A. Dittmann,Alicia M. Soderberg,Laura Chomiuk,Raffaella Margutti,W. M. Goss,Dan Milisavljevic,Roger A. Chevalier +6 more
TL;DR: In this paper, the authors present observations of SN 1970G, serendipitously observed during the monitoring campaign of SN 2011fe, which shares the same host galaxy and distinctly resolve it from the H II cloud with which it is associated.
Radio Supernova SN 1998bw and Its Relation to GRB 980425
Zhi-Yun Li,Roger A. Chevalier +1 more
TL;DR: In this paper, the authors used a synchrotron self-absorption model for the radio emission of a Type Ic supernova to infer that the gas is expanding into a circumstellar medium at a speed comparable to the speed of light, assuming that the efficiencies of production of relativistic electrons and magnetic field are constant through the evolution.
A relativistic type Ibc supernova without a detected gamma-ray burst.
Alicia M. Soderberg,Sayan Chakraborti,Giuliano Pignata,Roger A. Chevalier,Poonam Chandra,Alak Ray,M. H. Wieringa,A. Copete,Vandiver Chaplin,Valerie Connaughton,Scott Barthelmy,Michael Bietenholz,N. Chugai,Maximilian Stritzinger,Maximilian Stritzinger,Mario Hamuy,Claes Fransson,Ori Fox,E. M. Levesque,E. M. Levesque,J. E. Grindlay,P. Challis,Ryan J. Foley,Robert P. Kirshner,Peter Milne,Manuel A. P. Torres +25 more
TL;DR: The discovery of luminous radio emission from the seemingly ordinary type Ibc SN 2009bb, which requires a substantial relativistic outflow powered by a central engine, is reported.
Time evolution of the line emission from the inner circumstellar ring of SN 1987A and its hot spots
Per Gröningsson,Claes Fransson,Bruno Leibundgut,Peter Lundqvist,Peter Challis,Roger A. Chevalier,Jason Spyromilio +6 more
TL;DR: In this paper, the authors used high-resolution spectra from the UVES echelle spectrograph at VLT to identify three different emission line components from the spectra of SN 1987A: a narrow (~10 km/s) velocity component emerges from the unshocked ring, a broad component extending to ~15,000 km /s comes from the reverse shock.