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MARCO FEROCI INAF, ROME ANNA WATTS UNIV. OF AMSTERDAM MICHIEL VAN DER KLIS UNIV. OF AMSTERDAM ON BEHALF OF THE LOFT CONSORTIUM LOFT LARGE OBSERVATORY ESA COSMIC VISION M3 FOR X-RAY TIMING CANDIDATE MISSIONS PRESENTATION EVENT LOFT SCIENCE LOFT ADDRESSES THE COSMIC VISION THEME “Matter Under Extreme Conditions” Probe the state of matter at supra nuclear densities in Neutron Stars (“Dense Matter”) Probe gravity theory in the very strong field environment of Black Holes (“Strong Gravity”) Probe physics of hundreds of galactic and bright extragalactic cosmic sources (“Observatory Science”) PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS THE LOFT APPROACH WHAT LOFT MUST HAVE Exploit the Diagnostics of X-ray Variability on Dynamical Timescales: Large Collecting Area Exploit the Diagnostics of Spectral Variability on Dynamical Timescales: Good Energy Resolution (XMM-class) PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS THE LOFT APPROACH WHATWHATLOFTLOFT MUST HASHAVE! Large Collecting Area 200 eV Good Energy Resolution (XMM-class) PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS THE LOFT APPROACH WHATWHATLOFTLOFT MUST HASHAVE! Large Collecting Area LHC SDD Detectors Heritage 200 eV Good Energy Resolution (XMM-class) Microchannel Plate Collimators PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT’S CHANGING THE GAME LOFT UNITES SPECTROSCOPY & TIMING, AT ENORMOUS AREA RXTE LOFT 2 1100 eV, 0.65 m2 200 eV, 10 m XMM 130 eV, 0.085 m2 No pile-up pile-up-limited not part of any planned X-ray mission PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT - LARGE AREA DETECTOR 125x 2000x 16 µm 83 µm 4 m2 @ 2 keV EFFECTIVE AREA 10 m2 @ 8 keV 1 m2 @ 30 keV 2-30 keV ENERGY RANGE (30-80 keV ext.) ENERGY 200 eV @ 6 keV RESOLUTION FWHM COLLIMATED FOV 1 deg FWHM ABSOLUTE TIME 1 s ACCURACY PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT - LARGE AREA DETECTOR PERFORMANCE LAD INSTANTANEOUS SKY VISIBILITY 180 eV 240 eV 300 eV 340 eV 75% of the sky accessibile to LAD at any time. Combination of Sky Visibility and Mission Duration ensures required number of transients PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT - WIDE FIELD MONITOR 5 Units 10 Cameras FIELD OF VIEW 5.5 steradian POSITION ACCURACY (10) 1 arcmin ENERGY RANGE 2-50 keV ENERGY RESOLUTION 300 eV @ 6 keV COLLECTING AREA 1820 cm2 10 s (trigger) TIME RESOLUTION minutes (images) SENSITIVITY (5σ, 270 mCrab (3s) GALACTIC CENTER) 2.1 mCrab (1day) GROUND TRANSMISSION OF < 30s GRB COORDINATES PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT - WIDE FIELD MONITOR PERFORMANCE FIELD OF VIEW cm2 EXPOSURE MAP Ms PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS MISSION CONFIGURATION FEASIBLE MISSION IN SEVERAL CONFIGURATIONS, WITH STANDARD EQUIPMENT South atlantic anomaly Item Value Orbit Equatorial, 550 km Launcher Soyuz (6,000 kg launch capability) Mass 4,000 kg Power 4 kW Telemetry 6.7 Gbit/orbit Ground Stations Kourou, Malindi Pointing 3-axis stabilized Mission Duration 3+2 years PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS MISSION FEASIBILITY FEASIBLE MISSION IN SEVERAL CONFIGURATIONS, WITH STANDARD EQUIPMENT ESA Review: South atlantic anomaly “mission feasible and of low technical risk and medium schedule risk for a 2022 launch date; a launch in 2023Item is seen as realisticValue ” Orbit Equatorial, 550 km “The overall instrument as wellLauncher as the ScienceSoyuz Ground Segment concept is considered to be mature and well documented. The level of detail with which theMass instrument design4,000 kg is described significantly exceedsPower general expectations4 kW at the end ofTelemetry a Phase A study10 Gbit.” /orbit Ground Stations Kourou, Malindi Pointing 3-axis stabilized Mission Duration 3+2 years PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS THE ESA PREFERRED LOFT CONCEPT PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS PROGRAMMATICS AND SCIENCE MANAGEMENT Payload and Science Data Center provided by Institutes in ESA Member States. LOFT Science Team even wider in Europe and worldwide LOFT IS AN OPEN OBSERVATORY All LAD data open to the Community through peer-reviewed proposals. All WFM data public after validation. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT IN THE MULTI-FREQUENCY CONTEXT LOFT in the Multi-wavelength and Multi-messenger Context of Time Domain Astronomy PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT IN THE MULTI-FREQUENCY CONTEXT LOFT in the Multi-wavelength and Multi-messenger Context of Time Domain Astronomy PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS DENSE MATTER Dense matter Strong field gravity Observatory science PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT DENSE MATTER THEME The strong force determines the state of nuclear matter - from atomic nuclei to neutron stars. It is a major problem within modern physics. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT DENSE MATTER THEME The strong force determines the state of nuclear matter - from atomic nuclei to neutron stars. It is a major problem within modern physics. PROGRESS IS DRIVEN BY LABORATORY EXPERIMENT AND ASTROPHYSICAL OBSERVATION. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS DENSE MATTER AND NEUTRON STARS – A UNIQUE REGIME Neutron LOFT Stars PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS DENSE MATTER AND NEUTRON STARS – A UNIQUE REGIME Neutron stars contain the densest and most neutron-rich matter in the Universe. Neutron LOFT Stars LOFT WILL STUDY NUCLEONIC MATTER IN A UNIQUE REGIME, AND EXOTIC STATES OF MATTER THAT COULD NEVER EXIST IN THE LABORATORY. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Equation of state (EOS) The strong force determines the ‘stiffness’ of neutron star matter. This is encoded in the EQUATION OF STATE. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Equation Nucleonic of state (EOS) The strong force determines the ‘stiffness’ of neutron star matter. This is encoded in the EQUATION OF STATE. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Equation Nucleonic of state (EOS) The strong force determines the ‘stiffness’ of neutron star matter. This is encoded in the EQUATION OF STATE. Quark stars PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Equation Nucleonic of state (EOS) The strong force determines the Strange ‘stiffness’ of neutron cores star matter. This is encoded in the EQUATION OF STATE. Quark stars PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Equation Nucleonic of state (EOS) The strong force determines the Strange ‘stiffness’ of neutron cores Chiral EFT star matter. models This is encoded in the EQUATION OF STATE. Quark stars PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION EOS PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION EOS PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS STRONG FORCE, EQUATION OF STATE, AND MASS-RADIUS RELATION Stellar structure equations EOS Mass-Radius (M-R) LOFT MUST MEASURE BOTH M AND R TO HIGH PRECISION (LOW STATISTICAL AND SYSTEMATIC ERRORS) FOR A RANGE OF M. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS PULSE PROFILE MODELLING (1) General Relativity Hotspots on accreting neutron stars generate pulsations. Relativistic effects (light-bending, redshifts, aberration) encode information about M and R. Hotspot in thermonuclear burst LOFT WILL RECOVER M AND R FROM THE (Spitkovsky et al. 2002) PHOTON ENERGY-DEPENDENT PULSE PROFILE. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS PULSE PROFILE MODELLING (2) 3.0 TE RX 2.5 Detailed simulations carried out to evaluate fitting General Relativity 2.0 LOFT procedure and accuracies ) ) ) • • • (Lo et al. 2013, ApJ). O O O M M M ( ( ( s s s 1.5 s s s Few % accuracy needs a a a 6 2 M M M ~10 photons: 10m area 1.0 crucial. 0.5 Multiple same-source cross- checks. 0.0 8 10 12 14 16 Radius (km) USING ONLY KNOWN SOURCES, LOFT’S PULSE PROFILE MODELLING MEASUREMENTS WILL MAP THE M-R RELATION AND HENCE THE EOS. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS SPIN MEASUREMENTS For most accreting NS spin is not yet Spin rates constrain EOS via known. Pulsations (especially for high mass-shedding limit. accretion rate sources) are weak or intermittent. LOFT’S EXQUISITE SENSITIVITY WILL ALLOW FULL CHARACTERIZATION OF THE SPIN DISTRIBUTION OF ACCRETING NEUTRON STARS. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS ASTEROSEISMOLOGY Starquakes on magnetars trigger Magneto-elastic seismic global seismic vibrations. Current vibration models constrain M-R data come from the rarest, most and hence the EOS. energetic events. LOFT WILL BE SENSITIVE TO SEISMIC VIBRATIONS FROM SMALLER STARQUAKES, DRIVING THE EMERGING FIELD OF NEUTRON STAR ASTEROSEISMOLOGY. PROBING SPACETIME AND MATTER UNDER EXTREME CONDITIONS LOFT AND DENSE MATTER - SUMMARY LOFT • measures both M and R. • minimises statistical error with its large effective area. • minimises systematic error with complementary methods and same source cross-checks. • relies only on known sources to deliver the required number of data points. No other facility does this. LOFT WILL MEASURE THE EOS OF DENSE MATTER, THE KEY TO UNDERSTANDING THE STRONG