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Plans for S2 inspiral analyses. LSC Inspiral Analysis Group June 27. 2003 Circulation restricted to LIGO-I members. IUL Group S2 Science Goal #1. Binary Neutron Star Search

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plans for s2 inspiral analyses

Plans for S2 inspiral analyses

LSC Inspiral Analysis Group

June 27. 2003

Circulation restricted to LIGO-I members

iul group s2 science goal 1
IUL Group S2 Science Goal #1
  • Binary Neutron Star Search
    • upper limit on the rate of binary neutron star inspirals in the universe with target population to include Andromeda unless we see something
  • Anticipated results
    • Assume weak detection from Andromeda
    • Efficiency ~ 0.2 and T~800
    • R~25 /yr /MWEG
    • (S1: 170 /yt/MWEG)

LIGO Scientific Collaboration - IUL Group

iul group s2 science goal 11
IUL Group S2 Science Goal #1
  • Improvements over S1 analysis
    • Data Quality cuts up front
    • H1-H2, H1-L1, H2-L1 & H1-H2-L1 coincidence
    • Improved veto studies (safety tests helped by many hardware injections)
  • New features
    • New chi-squared tests
    • Improved PSD estimators (use median and better averaging)
  • Use hierarchical pipeline:
    • Trigger in L1 at S/N = rL1
    • This corresponds to a S/N in H1 of rH1
    • And a S/N in H2 of rH2
    • rH1 = (sigmaH1/sigmaL1)*rL1 ~ 0.45*rL1 (using SenseMon ranges)
    • Depending on threshold cuts for each IFO we will have double or triple coincidence  coherent analysis

LIGO Scientific Collaboration - IUL Group

iul group s2 science goal 2
IUL Group S2 Science Goal #2
  • Non-spinning binary black hole (BBH) search
    • Undecided what the scientific paper at the end will be: null result or rate upper limit.
    • Anticipated max. distance to optimally oriented binary is up to 7Mpc at ~20 Msun assuming standard post-Newtonian waveforms
  • New aspects of this search
    • Uncertainty in waveforms mean looser chi-squared cuts
    • Use detection template family
      • must Monte-Carlo efficiency to all known model waveforms (costly)
    • Instrumental vetoes and coincidence far more important
    • Will add coincidence with a burst and ringdown search after end of inspiral search
  • Anticipated results:
    • First search (event candidate, if we got extremely lucky) for BBH inspiral

LIGO Scientific Collaboration - IUL Group

binary black hole range
Binary Black Hole Range

Effective One Body

Standard post-Newt

LIGO Scientific Collaboration - IUL Group

iul group s2 science goal 3
IUL Group S2 Science Goal #3
  • Search for low-mass BBH mergers in Halo
    • i.e. MACHO binary search
  • Search will follow binary neutron star pipeline
    • Only new aspect of search will be population model
    • Large uncertainties in mass distributions
    • Probably insensitive to spatial distribution
  • Anticipated results:
    • High efficiency, T~800 hrs  R ~ few a year

LIGO Scientific Collaboration - IUL Group

task list and schedule
Template Bank Search:

Report by July 1. (Duncan, Patrick B.)

Data Quality: Use what\'s available on July 1.

(Peter S. and Gaby)

Veto Studies:

First report by July 1. Tabulate, but also worry about how to integrate this information automatically into pipeline (Yunyong, Weili, Brian, Nelson, Natalia).

Template Search Validation:

Report July 15th (Stas+)

Coherent Code:

Report July 15th (_____)

Beta Pipeline:

Report July 15th. (Patrick)

Time of Arrival template Chisq:

Report July 15th. (Valera)

Spin Statistics for BH-X binaries:

Report July 15th (Philippe,Vicky)

Report on Burst/Inspiral trigger coincidence,

July 22nd (Saikat,Warren)

Face to Face: LLO July 25th.

Review initial pipeline output. (All)

Task list and schedule

LIGO Scientific Collaboration - IUL Group

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