A temperature scale of $1\sim2$ eV in the mass-radius relationship of white dwarfs of type DA
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| Format: | Preprint |
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2024
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| _version_ | 1866929477578129408 |
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| author | Lim, Jin Kim, Ji-Yu van Putten, Maurice H. P. M. |
| author_facet | Lim, Jin Kim, Ji-Yu van Putten, Maurice H. P. M. |
| contents | The mass-radius relationship of white dwarfs (WDs) is one of their defining characteristics, largely derived from electron degeneracy pressure. We present a model-independent study of the observed mass-radius relationship in WD binaries of \cite{Parsons_2017}, listing data over a broad temperature range up to about 60,000 K (5 eV). The data show an appreciable temperature sensitivity with pronounced intrinsic scatter (beyond measurement uncertainty) for the canonical He-models with proton-to-neutron ratio 1:1. We characterize temperature sensitivity by a temperature scale $T_0$ in model-agnostic power-law relations with temperature normalized radius. For low-mass WDs, the results identify a remarkably modest $T_0 = 1 \sim 2 $ eV. We comment on a potential interpretation for atmospheres insulating super-Eddington temperature cores from the sub-Eddington photospheres of low-mass WDs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_15291 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A temperature scale of $1\sim2$ eV in the mass-radius relationship of white dwarfs of type DA Lim, Jin Kim, Ji-Yu van Putten, Maurice H. P. M. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena The mass-radius relationship of white dwarfs (WDs) is one of their defining characteristics, largely derived from electron degeneracy pressure. We present a model-independent study of the observed mass-radius relationship in WD binaries of \cite{Parsons_2017}, listing data over a broad temperature range up to about 60,000 K (5 eV). The data show an appreciable temperature sensitivity with pronounced intrinsic scatter (beyond measurement uncertainty) for the canonical He-models with proton-to-neutron ratio 1:1. We characterize temperature sensitivity by a temperature scale $T_0$ in model-agnostic power-law relations with temperature normalized radius. For low-mass WDs, the results identify a remarkably modest $T_0 = 1 \sim 2 $ eV. We comment on a potential interpretation for atmospheres insulating super-Eddington temperature cores from the sub-Eddington photospheres of low-mass WDs. |
| title | A temperature scale of $1\sim2$ eV in the mass-radius relationship of white dwarfs of type DA |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.15291 |