Chandra observation of the Type Ia SN 2005ke

Physics

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Chandra Proposal Id #07508238

Scientific paper

The longest Swift obs. obtained to date (258-ksec) on a SN gives evidence that the Type Ia SN 2005ke has been detected in X-rays, at a low level of significance (3-3.5 sigma, CBET 387). See http://lheawww.gsfc.nasa.gov/users/immler/SN2005ke/Immler_fig1.jpg for Swift UV and XRT X-ray image. No SN Ia has ever been detected in X-rays. The Swift UVOT UV lightcurve http://lheawww.gsfc.nasa.gov/users/immler/SN2005ke/Immler_fig3b.jpg shows a UV excess starting around 35d after the explosion with respect to SN Ia lightcurve templates, coinciding with the onset of X-ray emission. The detection of UV excess is independent confirmation that the X-rays are from the interaction of the SN shock with CSM as the UV emission is due to the Mg II emission line at 280 nm. We request a 15-ksec Chandra ACIS-S observation of the nearby (20.7 Mpc) Type Ia SN 2005ke to unambigiously associate the detected Swift X-ray source with the SN.

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