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The EXTraS project to explore the X-ray Transient and variable Sky searchesfor coherent signals in the X-ray archival data of XMM-Newton. XMM-Newtonperformed more than 400 pointed observations in the region of the LargeMagellanic Cloud (LMC). We inspected the results of the EXTraS period search tosystematically look for new X-ray pulsators in our neighbour galaxy. Weanalysed the XMM-Newton observations of two sources from the 3XMM cataloguewhich show significant signals for coherent pulsations. 3XMM J051259.8-682640was detected as source with hard X-ray spectrum in two XMM-Newton observations,revealing a periodic modulation of the X-ray flux with 956~s. As opticalcounterpart we identify an early-type star with Halpha emission. The OGLEI-band light curve exhibits a regular pattern with three brightness dips whichmark a period of ~1350 d. The X-ray spectrum of 3XMM J051034.6-670353 isdominated by a super-soft blackbody-like emission component (kT ~ 70 eV) whichis modulated by nearly 100% with a period of ~1418 s. From GROND observationswe suggest a star with r' = 20.9 mag as possible counterpart of the X-raysource. 3XMM J051259.8-682640 is confirmed as a new Be/X-ray binary pulsar inthe Large Magellanic Cloud. We discuss the long-term optical period as likelyorbital period which would be the longest known from a high-mass X-ray binary.The spectral and temporal properties of the super-soft source 3XMMJ051034.6-670353 are very similar to those of RX J0806.3+1527 and RXJ1914.4+2456 suggesting that it belongs to the class of double-degeneratepolars and is located in our Galaxy rather than in the LMC.

astronomy and astrophysics

EXTraS discovery of two pulsators in the direction of the LMC: a  Be/X-ray binary pulsar in the LMC and a candidate double-degenerate polar in  the foreground