UNVEIL THE PROPERTIES OF MILLISECOND TRANSIENT X-RAY PULSARS IN QUIESCENCE

Three new transient millisecond Xray pulsars (TMXPs) have been discoveredrecently. Together with SAX J1808.43658 these transients show peculiarcharacteristics (beyond pulsations, e.g. orbital periods of virgul40 min) whichlikely indicate that they form a separate subclass in between transient neutronstar systems. Also in quiescence SAX J1808.43658 is peculiar, showing a lowerluminosity and the lack of a soft component. These observational facts likelyindicate the presence of a massive (>1.7 solar masses) neutron star, confirmingthe recycling connection between LMXRBs and MSPs. Here we propose to observe thenew three TMXPs in quiescence to unveil their properties and to identifysimilarities and differences with SAX J1808.43658. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]