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We present a deep XMM-Newton observation of DN Tau, a young M0-type accretingCTTS and investigate its X-ray properties and X-ray generating mechanisms.Specifically we examine the presence of X-ray emission from magnetic activityand accretion shocks and compare our new X-ray data with UV data takensimultaneously and with X-ray/UV observations performed before. We find thatthe X-ray emission from DN Tau is dominated by coronal plasma generated viamagnetic activity, but also clearly detect a contribution of the accretionshocks to the cool plasma component at about 2 MK as consistently inferred fromdensity and temperature analysis. Typical phenomena of active coronae likeflaring, the presence of very hot plasma at 30 MK and an abundance patternshowing the inverse FIP effect are seen on DN Tau. Strong variations in theemission measure of the cooler plasma components between the 2005 and 2010 XMMdata point to accretion related changes. The UV light curve takensimultaneously is in general not related to the X-ray brightness, but exhibitsclear counterparts during the observed X-ray flares. The X-ray properties of DNTau are similar to those of more massive CTTS, but its low mass and largeradius shift the accretion shocks to lower temperatures, reducing their imprintin the X-ray regime.

DN Tauri - coronal activity and accretion in a young low-mass CTTS