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Expanding the LISA Horizon from the Ground
Kaze W K Wong1, Ely D Kovetz1, Curt Cutler2,3
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218 USA.
Physical Review Letters
|January 5, 2019
Summary
Future ground-based detectors will enhance the Laser Interferometer Space Antenna
Area of Science:
- Astronomy and Astrophysics
- Gravitational-Wave Astronomy
Background:
- The Laser Interferometer Space Antenna (LISA) observatory has limitations in detecting stellar-mass binary black hole (BBH) mergers.
- Future ground-based gravitational-wave (GW) detectors will achieve high sensitivity by LISA's launch.
Purpose of the Study:
- To propose a method for enhancing LISA's detection capabilities for stellar-mass BBH mergers.
- To leverage ground-based detector data to improve LISA's detection rates.
Main Methods:
- Utilizing data from ground-based detectors to re-analyze LISA data for subthreshold events.
- Implementing a strategy to discard spurious triggers by cross-referencing with a ground-based catalog.
- Significantly lowering the signal-to-noise threshold (ρ_LISA) for LISA data analysis.
Main Results:
- The proposed method allows for a substantial reduction in the LISA signal-to-noise threshold, boosting detection rates.
- Events like GW150914, undetectable by LISA with standard thresholds, could be detected using this approach.
- Estimated boost in stellar-mass BBH merger detection rates for LISA: ~4 (conservative) to >8 (optimistic).
Conclusions:
- This method significantly enhances LISA's ability to detect stellar-mass BBH mergers.
- Improved multiband GW observations will be enabled by the increased detection rate and frequency lever arm.
- This approach opens new avenues for testing physics with gravitational waves.
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