Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912080752279552 |
|---|---|
| author | Galloway, D. K. Goodwin, A. J. Hilder, T. Waterson, L. Cupák, M. |
| author_facet | Galloway, D. K. Goodwin, A. J. Hilder, T. Waterson, L. Cupák, M. |
| contents | Thermonuclear (type-I) bursts exhibit properties that depend both on the local surface conditions of the neutron stars on which they ignite, as well as the physical parameters of the host binary system. However, constraining the system parameters requires a comprehensive method to compare the observed bursts to simulations. We have further developed the beansp code for this purpose and analysed the bursts observed from IGR J17498-2921, a 401-Hz accretion-powered pulsar, discovered during it's 2011 outburst. We find good agreement with a model having H-deficient fuel with X = 0.15 +/- 0.4, and CNO metallicity Z=0.0014^{+0.0004}_{-0.0003}, about a tenth of the solar value. The model has the system at a distance of 5.7^{+0.6}_{-0.5} kpc, with a massive (approx. 2 M_sun) neutron star and a likely inclination of 60 deg. We also re-analysed the data from the 2002 outburst of the accretion-powered millisecond pulsar SAX J1808.4-3658. For that system we find a substantially closer distance than previously inferred, at 2.7 +/- 0.3 kpc, likely driven by a larger degree of burst emission anisotropy. The other system parameters are largely consistent with the previous analysis. We briefly discuss the implications for the evolution of these two systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_16471 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921 Galloway, D. K. Goodwin, A. J. Hilder, T. Waterson, L. Cupák, M. High Energy Astrophysical Phenomena Thermonuclear (type-I) bursts exhibit properties that depend both on the local surface conditions of the neutron stars on which they ignite, as well as the physical parameters of the host binary system. However, constraining the system parameters requires a comprehensive method to compare the observed bursts to simulations. We have further developed the beansp code for this purpose and analysed the bursts observed from IGR J17498-2921, a 401-Hz accretion-powered pulsar, discovered during it's 2011 outburst. We find good agreement with a model having H-deficient fuel with X = 0.15 +/- 0.4, and CNO metallicity Z=0.0014^{+0.0004}_{-0.0003}, about a tenth of the solar value. The model has the system at a distance of 5.7^{+0.6}_{-0.5} kpc, with a massive (approx. 2 M_sun) neutron star and a likely inclination of 60 deg. We also re-analysed the data from the 2002 outburst of the accretion-powered millisecond pulsar SAX J1808.4-3658. For that system we find a substantially closer distance than previously inferred, at 2.7 +/- 0.3 kpc, likely driven by a larger degree of burst emission anisotropy. The other system parameters are largely consistent with the previous analysis. We briefly discuss the implications for the evolution of these two systems. |
| title | Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2403.16471 |