Searches for Compact Binary Coalescences in LIGO and Virgo data Gabriela González For the LIGO Scientific Collaboration and the Virgo Collaboration APS.

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Presentation transcript:

Searches for Compact Binary Coalescences in LIGO and Virgo data Gabriela González For the LIGO Scientific Collaboration and the Virgo Collaboration APS meeting, Feb Session B13: Observational Implications of Gravitational Waves LIGO-G

The LIGO-Virgo CBC group searches Low mass search: Total mass from 2-35 M  –S5 First year search: PRD 79, (2009) –S month search: PRD 80, (2009) –S5-VSR1 5 month joint search (nearing completion) –S6/VSR2a: Data analyzed High mass search: Total mass from M  – (nearing completion) S5-VSR1 GRB (triggered) search – arXiv: v1 (2010) S5 Ringdown Search Spinning Search LIGO – S5: November 4, 2005 – September 30, 2007 Virgo – VSR1: May 18, 2007 – September 30, 2007 S6 and VSR2 started on July – S6/VSR2a=First 7 weeks

Overview of the Search Pipeline Generate a template bank – Total mass from 2-35 M  (low mass search) – Total mass from M  (high mass search) – Minimum component mass 1 M  Match filter the data Search for coincidence in multiple detectors Apply data quality Signal consistency checks – Use χ 2 parameter Calculate a false alarm rate Interpret the results

False alarm rates (FAR) Estimate looking for coincidences with unphysical time delays. 2 ifo background coincidences are more likely than 3 or 4 ifo coincidences We combine results using FAR, not SNR

Low Mass Results (pre-VSR1) Loudest triggers S5 1 st year low massS month search 1/FAR High mass results and remaining S5-VSR1 low mass results will be ready soon! PRD 79, (2009) PRD 80, (2009)

Low Mass Results (pre-VSR1) No triggers were found that were inconsistent with background estimates. The loudest triggers were subject to our “follow-up process” Our conclusion is that no gravitational wave candidates were found in this search  With no potential events, we set upper limits on the rates of binary coalescences.

Upper limits (pre-VSR1) Milky Way – 1.7 L 10 Binary neutron stars Neutron star – black holes Binary black holes Current results1.4x10 -2 L yr x10 -3 L yr x10 -4 L yr -1 Predicted “plausible” astrophysical rates 6x10 -4 L yr -1 6x10 -5 L yr -1 2x10 -5 L yr -1 Predicted “realistic” astrophysical rates 6x10 -5 L yr -1 2x10 -6 L yr -1 2x10 -7 L yr -1 Definitionm 1 = m 2 =1.35M ⊙ m 1 = 5.0 M ⊙, m 2 = 1.35 M ⊙ m 1 = m 2 =5.0 M ⊙ Astrophysical rates: LIGO-P PRD 80, (2009)

Searches for short GRBs L1, H1, V1 on!! Astrophys. J. 681, 1419 (2008) B13, Sat 12:09pm: Seeking optical counterparts to gravitational wave event candidates (Jonah Kanner) K13, Sun 3:30pm: High Energy Gamma Rays from GRB and Gravitational Wave Detection (many talks!)

GRB search result No GWs detected  arXiv: v1 (2010)

S6-VSR2 Status Update S6 and VSR 2 started on July S6 is LIGO's 6th science run, “Enhanced LIGO” VSR2 is Virgo's 2nd science run Planned to run for about a year with interspersed commissioning breaks S6-VSR2a ran 7 weeks; ended August 24th with first LIGO commissioning break Virgo started commissioning break to install new mirrors (better sensitivity!) in January 8, back in ~June

All seven weeks analyzed and boxes opened Results will undergo internal review and be released soon S6a included a Blind Injection Challenge S6-VSR2a Current Status

The Future S6 will continue until ~Fall 2010 Virgo is installing monolithic suspensions and plans to rejoin in three to four months Advanced LIGO detectors will begin to be installed in the fall, and will start to come online in 2014 and begin working towards 10x the sensitivity of S5/VSR1 This will allow us to see 1000 times as many galaxies!

The future