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Perez-Torres, M A; Lundqvist, P; Beswick, R J; Bjornsson, C I; Muxlow, T W B; Paragi, Z; Ryder, S; Alberdi, A; Fransson, C; MARCAIDE, J M; Marti-Vidal, I; Ros, E; Argo, M K; Guirado, J C
The Astrophysical journal, 09/2014, Letnik: 792, Številka: 1Journal Article
We report deep EVN and eMERLIN observations of the Type Ia SN 2014J in the nearby galaxy M82. Our observations represent, together with JVLA observations of SNe 2011fe and 2014J, the most sensitive radio studies of Type Ia SNe ever. Our deep upper limits favor a double-degenerate (DD) scenario-involving two WD stars-for the progenitor system of SN 2014J, as such systems have less circumstellar gas than our upper limits. By contrast, most single-degenerate (SD) scenarios, i.e., the wide family of progenitor systems where a red giant, main-sequence, or sub-giant star donates mass to an exploding WD, are ruled out by our observations. The X-ray results are, however, important to rule out free-free and synchrotron self-absorption as a reason for the radio non-detections.) Our estimates on the limits on the gas density surrounding SN2011fe, using the flux density limits from Chomiuk et al., agree well with their results.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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