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Hughes (1), Nikolai Chugai (2), Peter Lundqvist (4), RAS, Roger Chevalier (3)","submitted_at":"2007-10-16T23:16:04Z","abstract_excerpt":"We set sensitive upper limits to the X-ray emission of four Type Ia supernovae (SNe Ia) using the Chandra X-ray Observatory. SN 2002bo, a normal, although reddened, nearby SN Ia, was observed 9.3 days after explosion. For an absorbed, high temperature bremsstrahlung model the flux limits are 3.2E-16 ergs/cm^2/s (0.5-2 keV band) and 4.1E-15 ergs/cm^2/s (2-10 keV band). Using conservative model assumptions and a 10 km/s wind speed, we derive a mass loss rate of \\dot{M} ~ 2E-5 M_\\odot/yr, which is comparable to limits set by the non-detection of Halpha lines from other SNe Ia. 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