S3 time domain known pulsar search

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Presentation transcript:

S3 time domain known pulsar search Rejean Dupuis, Matthew Pitkin and Graham Woan LSC Meeting LLO March 21st 2005

The story so far … We have previously been searching for known isolated pulsars with frequencies > 25 Hz (GW freq > 50 Hz) S2 produced upper limits for gravitational wave amplitude and neutron star ellipticity from 28 pulsars (PRL, accepted) We know the positions and spin-down parameters of these objects well from radio observations However there are more pulsars (82) with freqs > 25 Hz, most within binary systems …

Pulsars f > 25 Hz J0024-7204C J0218+4232 J1537+1155 J1745-0952 J1918-0642 J0024-7204D J0437-4715 J1603-7202 J1748-2446A J1939+2134 J0024-7204E J0514-4002A J1618-39 J1748-2446C J1952+3252 J0024-7204F J0534+2200 J1623-2631 J1757-5322 J1955+2908 J0024-7204G J0537-6910 J1629-6902 J1804-0735 J1959+2048 J0024-7204H J0613-0200 J1640+2224 J1804-2717 J2019+2425 J0024-7204I J0621+1002 J1641+3627A J1807-2459 J2033+17 J0024-7204J J0635+0533 J1641+3627B J1810-2005 J2051-0827 J0024-7204L J0711-6830 J1643-1224 J1823-3021A J2124-3358 J0024-7204M J0737-3039A J1701-3006A J1824-2452 J2129+1210D J0024-7204N J0751+1807 J1701-3006B J1843-1113 J2129+1210E J0024-7204O J1012+5307 J1701-3006C J1857+0943 J2129+1210F J0024-7204P J1022+1001 J1701-3006D J1905+0400 J2129+1210G J0024-7204Q J1024-0719 J1701-3006E J1909-3744 J2129+1210H J0024-7204R J1045-4509 J1701-3006F J1910+0004 J2129-5721 J0024-7204S J1300+1240 J1709+2313 J1910-5959A J2130+1210C J0024-7204T J1312+1810 J1713+0747 J1910-5959B J2140-2310A J0024-7204U J1420-5625 J1721-2457 J1910-5959C J2140-23B J0024-7204V J1435-6100 J1730-2304 J1910-5959D J2145-0750 J0024-7204W J1455-3330 J1732-5049 J1910-5959E J2229+2643 J0030+0451 J1518+0205A J1740-5340 J1911-1114 J2317+1439 J0034-0534 J1518+0204B J1744-1134 J1913+1011 J2322+2057 Preliminary results (80) Awaiting timing data (30) For S3 the main change has been adding code to take account of Doppler shifts in the binary systems

Binary pulsar signal In a binary system we need to take account of the pulsar motion within that system This adds extra terms to timing equivalent to those for the solar system These time delays are parameterised by various measurable properties of the binary system (period P, eccentricity e, angular velocity w, time of periastron T, projected semi-major axis asini etc) There are also other (model dependent) relativistic parameters Aberration delay (caused by pulsar rotation) Roemer deley (light travel time)

Binary pulsar models 70 binary pulsars fall mainly into two model categories 32 ELL1 (low eccentricity) 33 BT (Blandford-Teukolsky) 1 BT2P (two orbiting planets) 4 DD (Damour-Deruelle) including double pulsar binary J0737-3039A We have orbital parameters solutions over S3 for the majority of these pulsars from Andrew Lyne and Michael Kramer, Jodrell Bank.

Code testing BT Code has been written to calculate time delay with the three models BT, ELL1 and DD As we did for the solar system barycentring code, we have checked this against TEMPO Very good agreement for the parameter values within the validity range of TEMPO’s predictive mode We have recently had a productive code review, identifying a couple of bugs, now been fixed -1 ms 1 ms ELL1 -1 ms 1 ms

Analysis Analysis proceeds as for S2: Heterodyne to remove Dopper/spindown effects (including binary parameters where needed) Joint Bayesian analysis for unknown pulsar parameters, h0, f0, y and cosi using data (of unknown variance) from three LIGO interferometers

Preliminary Results

Preliminary Results h0 Pulsars Several of these could be astrophysically interesting given exotic neutron star equations of state (B. Owen, submitted to PRL) 31 pulsars are in globular clusters so spin-down is masked by Doppler motion within cluster (20 with apparent spin-up) h0 Pulsars 5e-25 < h0 < 1e-24 17 1e-24 < h0 < 5e-24 57 5e-24 < h0 < 1e-23 3 h0 > 1e-23 Ellipticity Pulsars 1e-6 < e < 5e-6 8 5e-6 < e < 1e-5 16 1e-5 < e < 1e-4 44 e > 1e-4 12 All values assume I = 1038 kgm2 and no error on distance

Selected preliminary results Lowest h0 upper limit: PSR J1435-6100 (f = 106.98 Hz, dist = 3.25 kpc) h0 = 6e-25 Lowest ellipticity upper limit PSR J2124-3358 (f = 202.8 Hz, dist = 0.25 kpc) e = 1.5e-06 Closest to spin-down upper limit Crab pulsar ~ 5 times greater than spin-down (f = 29.8 Hz, dist = 2.0 kpc) h0 = 7e-24, e = 3.6e-3 Assumes I = 1038 kgm2

Injections Recovered pdfs for PULSAR3 in H1 10 pulsar injections were performed in S3 over large range of signal amplitudes and parameters Injections have been recovered with the correct parameters (after calibration corrections) Black lines show injected parameter values

Further work Get timing data for remaining 30 pulsars from Jodrell Bank for S3 analysis Re-run analysis with code review bug fixes (expect small changes) Perform binary software injections to fully test binary code (using independent code to produce signals) Perform binary hardware injections into end of S4 Following the above, we intend to produce a long PRD results paper Analysis method is mature – results for S4 should follow soon after final S3.