The hidden companion in J1527: a 0.69 solar-mass white dwarf?
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916093324427264 |
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| author | Zhang, Zhi-Xiang Liu, Hao-Bin Yi, Tuan Sun, Mouyuan Gu, Wei-Min |
| author_facet | Zhang, Zhi-Xiang Liu, Hao-Bin Yi, Tuan Sun, Mouyuan Gu, Wei-Min |
| contents | Finding nearby neutron stars can probe the supernova and metal-enrichment histories near our Solar system. Recently, Lin et al. 2023 reported an exciting neutron star candidate, 2MASS J15274848+3536572 (hereafter J1527), with a small Gaia distance of 118 parsecs. They claim that J1527 harbors an unseen neutron star candidate with an unusually low mass of $0.98\pm0.03\,M_{\odot}$. In this work, we use the Canada-France-Hawaii Telescope high-resolution spectrum to measure J1527's orbital inclination independently. Our spectral fitting suggests an orbital inclination of $63\pm2$ degrees. Instead, by fitting a complex hybrid variability model consisting of the ellipsoidal-variation component and the star-spot modulation to the observed light curve, Lin et al. 2023 obtains an orbital inclination of $45.2_{-0.20}^{+0.13}$ degrees. We speculate that the orbital inclination obtained by the light-curve fitting is underestimated, since J1527's light curves are obviously not pure ellipsoidal variations. According to our new inclination ($i\sim 63$ degrees), the mass of the unseen compact object is reduced to $0.69\pm0.02\,M_\odot$, which is as massive as a typical white dwarf. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_08289 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The hidden companion in J1527: a 0.69 solar-mass white dwarf? Zhang, Zhi-Xiang Liu, Hao-Bin Yi, Tuan Sun, Mouyuan Gu, Wei-Min Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Finding nearby neutron stars can probe the supernova and metal-enrichment histories near our Solar system. Recently, Lin et al. 2023 reported an exciting neutron star candidate, 2MASS J15274848+3536572 (hereafter J1527), with a small Gaia distance of 118 parsecs. They claim that J1527 harbors an unseen neutron star candidate with an unusually low mass of $0.98\pm0.03\,M_{\odot}$. In this work, we use the Canada-France-Hawaii Telescope high-resolution spectrum to measure J1527's orbital inclination independently. Our spectral fitting suggests an orbital inclination of $63\pm2$ degrees. Instead, by fitting a complex hybrid variability model consisting of the ellipsoidal-variation component and the star-spot modulation to the observed light curve, Lin et al. 2023 obtains an orbital inclination of $45.2_{-0.20}^{+0.13}$ degrees. We speculate that the orbital inclination obtained by the light-curve fitting is underestimated, since J1527's light curves are obviously not pure ellipsoidal variations. According to our new inclination ($i\sim 63$ degrees), the mass of the unseen compact object is reduced to $0.69\pm0.02\,M_\odot$, which is as massive as a typical white dwarf. |
| title | The hidden companion in J1527: a 0.69 solar-mass white dwarf? |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.08289 |