Observations radio de pulsars binaires relativistes a Nancay
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1 Observations radio de pulsars binaires relativistes a Nancay Ismael Cognard icognard@cnrs-orleans.fr LPC2E, CNRS - Universite d'orleans, France Nancay Radio Telescope I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
2 An outstanding stability for fast recycled pulsars A rst very short life... After a birth at 30ms, the pulsar is rapidly slowing down and stops emission after few millions years.... then eternity! Those still present in a binary system speed-up by angular momentum transfer, and produce radio waves again, those are the recycled millisecond pulsars with an outstanding rotational stability! Alpar et al., Nature 300, 728 (1982) I.Cognard - Pulsars binaires relativistes Journ ees GPhys - Obs Meudon - 27 mai /17
3 GPUs based coherent dedispersion at Nancay Removing the dispersive eect The ionised ISM produce dispersion best measures need coherent dedispersion where dispersion removed before detection Diversion of GPUs Using high performance graphical card (GPU), water-cooled to increase their lifetime, 4 PCs with 8 GTX280 can easily dedisperse bw 512MHz (16Gb/s) in real time An ultimate precision Timing uncertainty can be as good as 20ns for a few pulsars. I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
4 Pulsar Timing Measuring a time of arrival a large radiotelescope a good clock, and a special instrumentation to remove the ISM dispersion Analysis of a collection of measured times of arrival (ToAs) Having a set of parameters (period, position, etc...), computing 'calculated times of arrival',! tting the parameters by minimization of the dierences (called residuals) between 'measured ToAs' and 'calculated ToAs'! looking at the residuals to nd unmodeled eects... I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
5 The ultra-stable pulsar PSR J at Nancay For the pulsar J (P=2.95ms, DM=10.39pc.cm 3, P b =1.53d) the ToAs residuals are characterized by an rms 90ns I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
6 Two main pulsar programs at Nancay Multi-wavelength observations Title : Multi-wavelength study of pulsars from radio to TeV photons : a joint long term program with FERMI Ephemeris for 120 pulsars are continuously produced to search for high energy pulsations and constrain emission processes 1000hr/yr The Pulsar Timing Array (PTA) 2000hr/yr Title : Timing of an array of millisecond pulsars (MSPs) and detection of multi-wavelength gravitational waves Around 30 highly stables millisecond precisely timed once a week to search for the signature of gravitational waves (GW) background High precision ToAs from relativistic binaries also used to conduct Tests of Gravitation I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
7 PSR J , a low mass Neutron Star PSR J P = 40.93ms DM = pc.cm 3 P b = days a.sini = lt-s, e = Data a combination of ToAs coming from 4 european and from Green Bank (US) radio telescopes I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
8 PSR J , a low mass Neutron Star - a better periastron advance _! - a signicant proper motion! a low mass pulsar m p < 1.17 M Janssen et al., A&A 490, 753 (2008) I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
9 PSR J , indep. limits on _ G and dipole radiation PSR J P = 5.25ms DM = pc.cm 3 P b = days a.sini = lt-s, e = Data a combination of ToAs coming from 4 european radio telescopes I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
10 PSR J , indep. limits on _ G and dipole radiation a weak but independent limit on tha variation of G and dipole radiation parameter D Lazaridis et al., MNRAS 400, 805 (2009) I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
11 PSR J PSR J P = 12.6ms, DM = pc.cm 3 P b = 0.69 d a.sini = 3.71 lt-s, e = Data Combination of ToAs coming Parkes, Green Bank and Nancay the Shapiro delay provides m p = M Ferdman et al., ApJ 711, 764 (2010) I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
12 PSR J , the 2M neutron star system PSR J P = 3.15ms, DM = 34.48pc.cm 3 P b = 8.68d, m p = M Green Bank + Nancay data Combining Green Bank (rare and precise) with Nancay (numerous and less precise) provides the rst 'good' estimate of the distance pc MCMC estimation (A.Lassus, PhD 2013) important for high energy eciency I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
13 PSR J A, the double pulsar Work still in progress... Data reduction nearly nished! min ToAs! paper in preparation with Michael Kramer, MPIfR Bonn I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
14 Triple system J I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
15 Triple system J : test of SEP a stable system a hierarchical clean system, nearly Keplerian orbits and high precision timing! a stable three-body laboratory an exceptional laboratory the inner binary is falling in the gravitational eld of the outer companion gravitational binding energy of neutron stars is 0.1 of their mass! test of the Strong Equivalent Principle I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
16 Frequent observations of triple system J Nancay observations Started end of July with a high cadence (1 every 2.5days), already 4000 ToAs - characterized by a mean uncertainty is 2s over 2 minutes integrated proles M2 student starting to work on it collaboration with A.Archibald (ASTRON) for SEP test I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
17 Conclusion Present - a new 512MHz bw pulsar instrumentation (2011) - a limit on the super-massive black holes binary system GWB - a successful collaboration with FERMI (tons of new detections : radio, high energy) - also : magnetar very close the Galactic Center (magnetic eld estimation) - J , J and J results Future - upgrade of the pulsar instrumentation (512MHz!1.5-2GHz) - better limit of the GWB (within the collaborations EPTA, IPTA) - double pulsar J A tests - test of SEP with triple system J new test/results coming from new exciting pulsars to be discovered I.Cognard - Pulsars binaires relativistes Journees GPhys - Obs Meudon - 27 mai /17
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