| Name: | JYOTIRMOY DAS |
| Affiliation: | National Centre for Radio Astrophysics(NCRA-Tifr) |
| Conference ID : | ASI2023_63 |
| Title : | EFFICIENT SEARCH FOR PULSARS IN COMPACT BINARIES |
| Authors : | Jyotirmoy Das, National Centre for Radio Astrophysics (NCRA), Pune.
Jayanta Roy, National Centre for Radio Astrophysics (NCRA), Pune.
Karel Adamek, Oxford e-Research Centre, University of Oxford, UK.
Wes Armour, Oxford e-Research Centre, University of Oxford, UK. |
| Mode of Presentation: | Poster |
| Abstract Category : | Instrumentation and Techniques |
| Abstract : | Double neutron stars (DNSs) in compact binaries are excellent systems to test the theories of gravity in strong fields. The measurement of the post-keplarian (PK) parameters probes the temporal evolution of the orbit, whereas compact orbits offer higher measurement precisions for some of the PK parameters in turn allowing enhanced precision for gravity test. Thus finding pulsars in such compact binaries (preferably DNS) becomes important in order to measure the PK parameters more accurately. The double pulsar system allowed us to measure the PK parameters and validate the GR with 99.9958% confidence. But, if we could find DNSs with a more compact orbital period, we will be able to constrain GR with more precision and also can test other probable gravity theories as well.
Till now, 19 DNSs have been detected, with the most compact one with an orbital period of 1.88 hours. The merging timescale of this 1.88 hours system being much higher than the predicted rate of DNS merger, confirms that there are more compact binaries with an orbital period < 1.88 hours. The ongoing GMRT High-Resolution Southern Sky (GHRSS) survey with mild acceleration correction is having a binary fraction of 14% (higher than the total Galactic pulsar population). However, the GHRSS processing encounters > 2 times sensitivity degradation for pulsars in compact binaries due to not employing jerk search. We show that implementing jerk+acceleration correction allows us to detect the missing population of compact binaries. However, the jerk search using PRESTO on CPU is significantly compute-intensive and not practically implementable. In this presentation, we demonstrate a jerk+acceleration search pipeline using GPU, which provides a feasible solution for applying these corrections even for blind search like the GHRSS survey. We also highlight the prospect of performing real-time jerk search with the GMRT for the globular clusters and high-energy point sources.
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