Plans for s2 inspiral analyses
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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

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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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