A search for close binary systems in the SALT survey of hydrogen-deficient stars using {\it TESS}
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913661987061760 |
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| author | Snowdon, E. J. Jeffery, C. S. Schlagenhauf, S. Dorsch, M. |
| author_facet | Snowdon, E. J. Jeffery, C. S. Schlagenhauf, S. Dorsch, M. |
| contents | The {\it TESS} periodograms of the SALT survey catalogue of hydrogen-deficient stars were searched for evidence of short-period variability. Periodic light curve variations were identified in 16 stars out of 153 catalogue objects, of which 10 were false positives. From the remaining 6 identified variables, Ton S 415 is a known close binary system and the sixth close binary containing a hydrogen-deficient hot subdwarf. Radial velocity and SED analyses ruled out the remaining 5 as close binary systems; the causes of their variability remain uncertain. With one or more K-type companions, BPS CS 22956-0094 may be a wide binary or triple. From this SALT+{\it TESS} sample, the fraction of close binaries stands at $ 1/29 \approx 3.5\%$ for intermediate helium hot subdwarfs and $0/124 = 0\%$ for extreme helium subdwarfs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_13656 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A search for close binary systems in the SALT survey of hydrogen-deficient stars using {\it TESS} Snowdon, E. J. Jeffery, C. S. Schlagenhauf, S. Dorsch, M. Solar and Stellar Astrophysics The {\it TESS} periodograms of the SALT survey catalogue of hydrogen-deficient stars were searched for evidence of short-period variability. Periodic light curve variations were identified in 16 stars out of 153 catalogue objects, of which 10 were false positives. From the remaining 6 identified variables, Ton S 415 is a known close binary system and the sixth close binary containing a hydrogen-deficient hot subdwarf. Radial velocity and SED analyses ruled out the remaining 5 as close binary systems; the causes of their variability remain uncertain. With one or more K-type companions, BPS CS 22956-0094 may be a wide binary or triple. From this SALT+{\it TESS} sample, the fraction of close binaries stands at $ 1/29 \approx 3.5\%$ for intermediate helium hot subdwarfs and $0/124 = 0\%$ for extreme helium subdwarfs. |
| title | A search for close binary systems in the SALT survey of hydrogen-deficient stars using {\it TESS} |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.13656 |