تقرير
An X-Ray-dim 'Isolated' Neutron Star in a Binary?
| العنوان: | An X-Ray-dim 'Isolated' Neutron Star in a Binary? |
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| المؤلفون: | Lin, Jie, Li, Chunqian, Wang, Weiyang, Xu, Heng, Jiang, Jinchen, Yang, Daoye, Yaqup, Shahidin, Iskandar, Abdusamatjan, Ma, Shuguo, Niu, Hubiao, Esamdin, Ali, Liu, Shuai, Ramsay, Gavin, Vines, Jose I., Shi, Jianrong, Xu, Renxin |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We report the discovery of a dark companion to 2MASS J15274848+3536572 with an orbital period of 6.14 hr. Combining the radial velocity from LAMOST observations and modelling of the multiband light curve, one obtains a mass function of $\simeq 0.131~\rm M_{\odot}$, an inclination of $45.20^\circ{}^{+0.13^{\circ}}_{-0.20^{\circ}}$, and a mass ratio of $0.631^{+0.014}_{-0.003}$, which demonstrate the binary nature of the dark companion with mass of $0.98 \pm 0.03\rm M_{\odot}$ and a main-sequence K9-M0 star of $0.62 \pm 0.01~\rm M_{\odot}$. LAMOST optical spectra at a range of orbital phases reveal extra-peaked Halpha emission that suggests the presence of an accretion disk. The dark companion does not seem to be a white dwarf because of the lack of any observed dwarf nova outbursts in the long-term data archive, although a magnetic white dwarf cannot be excluded. Alternatively, we propose a scenario wherein the dark companion is a neutron star, but we have not detected radio pulsations or a single pulse from the system with the FAST (Five-hundred-meter Aperture Spherical radio Telescope), which hints at a radio-quiet compact object. If the dark companion is identified as a neutron star, it will be the nearest ( ~ 118 pc) and lightest neutron star. Furthermore, a kinematic analysis of the system's orbit in the galaxy may suggest its supernova event is associated with the radionuclide $^{60} \rm Fe$ signal observed from the deep-sea crusts. This radio-quiet and X-ray-dim nearby neutron star may resemble an XDINS (X-ray-dim isolated neutron star), but in a binary. Comment: 17 pages, 9 figures; Accepted for publication in ApJL |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/2041-8213/acb54b |
| URL الوصول: | http://arxiv.org/abs/2210.11360 |
| رقم الأكسشن: | edsarx.2210.11360 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/2041-8213/acb54b |
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