| Name: | Abhijnan Kar |
| Affiliation: | IISER Berhampur |
| Conference ID: | ASI2025_79 |
| Title: | Evolution of neutron star spin frequency and other parameters in LMXBs and its implications for observed AMXPs. |
| Authors: | Abhijnan Kar 1, Pulkit Ojha 2, Sudip Bhattacharyya 3 |
| Authors Affiliation: | 1. Department of Physical Sciences, Indian Institute of Science Education and Research Berhampur, Vigyanpuri, Ganjam, 760003, India
2. School of Physical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatani, Khurda, 752050, India
3. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Colaba, Mumbai 400005, India |
| Mode of Presentation: | Poster |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | A low mass X ray binary system (LMXBs) has neutron star (NS) accreting matter from the companion/donor star which causes the NS to spin fast and become millisecond pulsars (MSPs). These LMXBs and MSPs hosted there are excellent tool to probe fundamental physics of NS and for that purpose detailed theoretical modelling is required. Here, we use numerical stellar evolution code MESA and systematically compute NS parameters’ evolution including its spin frequency. With computations using a range of initial parameter values, we predict the general trajectory of the NS spin frequency evolution, which is governed by various initial binary and stellar parameters. We show how the evolutionary trajectories depend on these initial parameter variation in order to produce LMXB constraints. Further, using our general evolution results, we indicate the formation channels and evolutionary scenario for few AMXPs by exactly matching with current observational parameters of NS spin frequency, orbital period etc. We also indicate plausible evolutionary scenario and initial parameter space for other AMXPs and try to model spin frequency of these systems for the first time. Further, we discuss current challenges with our general evolution models to predict initial parameter space for some AMXPs in late-stage evolution.
Reference: Abhijnan Kar, Pulkit Ojha, Sudip Bhattacharyya, Long-term evolution of spin and other properties of neutron star low-mass X-ray binaries: Implications for millisecond X-ray pulsars, MNRAS, Volume 535, Issue 1, November 2024, Pages 344–358, 2024; https://doi.org/10.1093/mnras/stae2346
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