The enhanced X-ray Timing and Polarimetry mission (eXTP) is a science mission designed to study the state of matter under extreme conditions of density, gravity and magnetism. Primary goals are the determination of the equation of state of matter at supra-nuclear density, the measurement of QED effects in highly magnetized star, and the study of accretion in the strong-field regime of gravity. Primary targets include isolated and binary neutron stars, strong magnetic field systems like magnetars, and stellar-mass and supermassive black holes.
The mission carries a unique and unprecedented suite of state-of-the-art scientific instruments enabling for the first time ever the simultaneous spectral-timing- polarimetry studies of cosmic sources in the energy range from 0.5-30 keV (and beyond). Key elements of the payload are:
the Spectroscopic Focusing Array (SFA): a set of 11 X-ray optics operating in the 0.5-10 keV energy band with a field-of-view (FoV) of 12 arcmin each and a total effective area of ?0.9 m2 and 0.6 m2 at 2 keV and 6 keV respectively. The telescopes are equipped with Silicon Drift Detectors offering <180 eV spectral resolution.

the Large Area Detector (LAD): a deployable set of 640 Silicon Drift Detectors, achieving a total effective area of ?3.4 m2 between 6 and 10 keV. The operational energy range is 2-30 keV and the achievable spectral resolution better than 250 eV. This is a non-imaging instrument, with the FoV limited to <1¡ FWHM by the usage of compact capillary plates.

the Polarimetry Focusing Array (PFA): a set of 2 X-ray telescopes, achieving a total effective area of 250 cm2 at 2 keV, equipped with imaging gas pixel photoelectric polarimeters. The FoV of each telescope is 12 arcmin and the operating energy range is 2-10 keV.

the Wide Field Monitor (WFM): a set of 3 coded mask wide field of view camera pairs, equipped with position-sensitive Silicon Drift Detectors, covering in total a FoV of 3.7 sr and operating in the energy range 2-50 keV.
Baseline design of the mission. The left panel shows an artistic view of the eXTP satellite, with the payload module tower and four LAD panels. In the right panel the top view of the scientific payload is shown. The current configuration of the mission includes 11 telescopes of the SFA, 2 telescopes of the PFA, 40 modules for the LAD and 3 WFM units, each composed of 2 cameras.
Aim of our participation

It is expected that both the LAD and WFM instruments of eXTP (already studied at the level of feasibility study - phase A - for the LOFT mission proposal to ESA M3) will be provided by Europe, in the framework of a global European participation in the Chinese mission eXTP supported by an ESA MoO (Mission of Opportunity). The Institute of Space Sciences will supply the mechanical and thermal configuration of the whole WFM plus the collimator and coded masks.
The eXTP LAD effective area is shown, on a log-log scale, in comparison with those of AstroSat-LAXPC and RXTE-PCA. It largely surpasses any past or currently flying mission and features an unprecedented value of about 3.4 m2 at 6 keV.
Recent developments

We played a significant role on the search of the best WFM configuration (3 camera pairs is the new baseline adopted) and we made crucial suggestions for the platform, in order to accommodate all the instruments and the sunshade required for the WFM.

Recent publications
"eXTP: Enhanced X-ray Timing and Polarization mission", Zhang, S. N.; Feroci, M.; Santangelo, A.; Dong, Y. W.; Feng, H.; Lu, F. J.; Nandra, K.; Wang, Z. S.; Zhang, S.; Bozzo, E.; Brandt, S.; De Rosa, A.; Gou, L. J.; Hernanz, M.; et al., Proceedings of the SPIE, Volume 9905, id. 99051Q 16 pp. (2016), https://arxiv.org/abs/1607.08823

"The LOFT mission concept: a status update", Feroci, M.; Bozzo, E.; Brandt, S.; Hernanz, M.; van der Klis, M.; et al., including L. Alvarez, J.L. G?lvez, L. Tolos, N. Rea, D.F. Torres, Proceedings of the SPIE, Volume 9905, id. 99051R 20 pp. (2016), http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2539449

"Large Observatory for x-ray Timing (LOFT-P): a Probe-class mission concept study", Wilson-Hogde, C. et al. including L. Alvarez, M. Hernanz, Proceedings of the SPIE, Volume 9905, id. 99054Y 12 pp. (2016), https://arxiv.org/abs/1608.06258

"Colloquium: Measuring the neutron star equation of state using x-ray timing", Watts, A. et al., including L. Tolos, Reviews of Modern Physics, Volume 88, Issue 2, id.021001, https://arxiv.org/abs/1602.01081

Senior Institute members involved

M. Hernanz, J. Isern, A. Serenelli D. F. Torres, N. Rea, E. de Oña, L. Tolos
WFM configuration, with 3 camera pairs located at 0, +60 and -60 degrees with respect to Z axis
Institute of Space Sciences (IEEC-CSIC)

Campus UAB, Carrer de Can Magrans, s/n
08193 Barcelona.
Phone: +34 93 737 9788
Email: ice@ice.csic.es
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya