Ton S 415: a close binary containing an intermediate helium subdwarf discovered with SALT and TESS Article Swipe
E. J. Snowdon
,
C. S. Jeffery
,
Saskia Schlagenhauf
,
M. Dorsch
,
I. M. Monageng
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad2303
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad2303
Hot subdwarfs are early-type low-mass stars lying between the main sequence and the white dwarf sequence. The majority have helium-burning cores and helium-poor surfaces. A minority have helium-rich surfaces. A few, including Ton S 415, have surfaces with between 10 per cent and 90 per cent helium (by number). Their properties are diverse and their origins mostly unknown. Ton S 415 was identified as a suspected binary in a Southern African Large Telescope (SALT) survey of hot subdwarfs from its large radial velocity. Using SALT spectroscopy and Transiting Exoplanet Survey Satellite light curves, we confirm that Ton S 415 is a close binary with an orbital period $p=84.6460\pm 0.0004\, {\rm min}$ and velocity semi-amplitude $K=175.5\pm 1.0\, {\rm km\, s^{-1}}$. Analysis of the SALT spectrum and broad-band spectral energy distribution shows the visible star to have an effective temperature $T_{\rm eff}=43\, 300\pm 1000\, {\rm K}$, surface gravity $\log g/{\rm cm\, s^{-2}}=5.89\pm 0.10$, surface helium-to-hydrogen ratio log y = −0.62 ± 0.10, radius $R=0.1074\pm 0.0025\, R_{\odot }$, and mass $M=0.33\pm 0.09\, {\rm {\rm M}_{\odot }}$. By modelling the light curve, we estimate the binary mass ratio to be q = 0.7 ± 0.3 and infer an unseen white dwarf companion with a mass of $M_{\rm WD}=0.47\pm 0.24\, {\rm {\rm M}_{\odot }}$. The results are consistent with a post-common-envelope binary that lost its hydrogen envelope before reaching the peak of the red giant branch, becoming a hot subdwarf with a non-canonical mass. We predict that the system will evolve into a double white dwarf binary before eventually either forming a stably accreting AM CVn system, or merging to form an R CrB star.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stad2303
- https://academic.oup.com/mnras/article-pdf/525/1/183/51088721/stad2303.pdf
- OA Status
- hybrid
- Cited By
- 4
- References
- 56
- Related Works
- 10
- OpenAlex ID
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- DOI
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https://doi.org/10.1093/mnras/stad2303Digital Object Identifier
- Title
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Ton S 415: a close binary containing an intermediate helium subdwarf discovered with SALT and TESSWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-07-28Full publication date if available
- Authors
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E. J. Snowdon, C. S. Jeffery, Saskia Schlagenhauf, M. Dorsch, I. M. MonagengList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stad2303Publisher landing page
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https://academic.oup.com/mnras/article-pdf/525/1/183/51088721/stad2303.pdfDirect link to full text PDF
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hybridOpen access status per OpenAlex
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https://academic.oup.com/mnras/article-pdf/525/1/183/51088721/stad2303.pdfDirect OA link when available
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Physics, Subdwarf, White dwarf, Surface gravity, Effective temperature, Astrophysics, Light curve, Exoplanet, Helium, Radial velocity, Stars, Atomic physicsTop concepts (fields/topics) attached by OpenAlex
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4Total citation count in OpenAlex
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2025: 3, 2024: 1Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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| publication_year | 2023 |
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