NRTidal-D

Analysis of the dissipative tidal deformability from gravitational wave (GW) strain data. In short: scripts for the Bayesian parameter estimation of the dissipative tidal deformabilities of the neutron stars in GW170817. For more details of our analysis, see the accompanying paper (see the Citation at the bottom).

1. Waveform model: Scripts for our waveform model (including the marginalized binary Love relations)
2. Injection-Recovery: Scripts to run Bayesian analysis of injection/recovery analysis for different GW detector networks.
3. GW170817-Recovery: Scripts to perform Bayesian analysis of GW170817 GW strain data.
4. ASD-Files: Amplitude strain data files (for different gravitational wave detector networks).

Conventions

In our theory'' and analysis'' papers (see Citation), we define the dissipative tidal deformability ``xi_tilde'' with an extra factor of 8, so that in the limit where the stars have the same radii, masses, tidal deformability, and dissipative tidal deformability (R1 = R2, ..., Xi1 = Xi2), then Xi reduces to Xi1. In the code here, we did not include the extra factor of 8 for historical reasons. To match the output in our papers then, you should multiply the code output for xi_tilde by 8.

Installation

This is not a proper python package; it is a collection of scripts we used to perform Bayesian analysis on GW data. To run these scripts, we recommend making a new conda environment.

The environment.yml file contains more details about the dependencies of our scripts. If you have any problems getting the environment set up, please email us. The main dependency is the bilby gravitational wave analysis library. If you have that installed our scripts should run fine, but beware of the different versions of bilby; not everything may work properly if you use an incompatible version.

GW170817 Data

We downloaded the glitch-free GW170817 strain data from gwosc.org.

Data, plots

We have uploaded the strain data we used, the raw output of our samplering of that data, and our plotting scripts to zenodo.

Authors

If you have any questions, please feel free to contact any one of us.

Justin Ripley

Abhishek Hegade

Rohit Chandramouli

Citation

Our data analysis paper

@article{Ripley:2023lsq,
    author = "Ripley, Justin L. and Hegade K. R., Abhishek and Chandramouli, Rohit S. and Yunes, and Nicolas",
    title = "{First constraint on the dissipative tidal deformability of neutron stars}",
    eprint = "2312.11659",
    archivePrefix = "arXiv",
    primaryClass = "gr-qc",
    month = "12",
    year = "2023"
}

For reference, the "theory" paper (derivation of the dissiaptive tidal deformability phasing formula) is

@article{Ripley:2023qxo,
    author = "Ripley, Justin L. and Hegade K. R., Abhishek and Yunes, Nicolas",
    title = "{Probing internal dissipative processes of neutron stars with gravitational waves during the inspiral of neutron star binaries}",
    eprint = "2306.15633",
    archivePrefix = "arXiv",
    primaryClass = "gr-qc",
    doi = "10.1103/PhysRevD.108.103037",
    journal = "Phys. Rev. D",
    volume = "108",
    number = "10",
    pages = "103037",
    year = "2023"
}