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PreprintCC BY 4.0arXiv

UX Men: Detached Eclipsing Binary as a Benchmark Candidate

  • Ganesh N. Pawar
  • Krzysztof G. Hełminiak
  • Nicola J. Miller
  • Frédéric Marcadon
  • Ayush Moharana
  • Tilaksingh B. Pawar
  • Anish Kalsi
  • Maciej Konacki
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Abstract

We present ultra-precise fundamental parameters for the detached eclipsing binary UX Men based on 31 TESS sectors (∼882 d) and radial velocities from HARPS, FEROS, CORALIE, and UCLES. The light curves were detrended for spot-induced variability and modelled independently with JKTEBOP and ALLESFITTER, while radial velocities were extracted via TODCOR and fitted with a Keplerian orbit. Spectral disentangling yielded individual component spectra analysed with iSpec to determine Teff and [M/H]. Multi-band photometry was used to determine the fluxes, flux ratios and ultimately to measure photometric Teff. We obtain the masses MA = 1.2300 ±0.0012 M⊙, MB = 1.1946±0.0012 M⊙ and radii RA = 1.3605±0.0031 R⊙, RB = 1.2801±0.0069 R⊙ with sub-percent precision. Uncertainties were found to be dominated by systematic effects coming from (weak) stellar activity. Teff,A = 6302±77, Teff,B = 6292±65 \& Metallicity estimates are [M/H]A = 0.02±0.13 dex and [M/H]B= 0.07±0.10 dex. Isochrone fitting yields a consistent age of τ = 2.75±0.13 Gyr. The system exhibits a ∼ 673-day periodicity in eclipse-timing variations, likely due to stellar activity, with no evidence for a third body. Results are independent of the modelling code used, but without proper treatment of activity-induced systematics the uncertainties would be underestimated. UX Men is a high-precision benchmark binary providing stringent tests of stellar models and a robust calibration source for PLATO. Expanding the sample of well-characterised detached eclipsing binaries will strengthen the empirical foundations for stellar physics and the calibration of future photometric missions

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Cite

BibTeXRIS
BibTeX
@misc{pawar2026detached,
  title = {{UX Men: Detached Eclipsing Binary as a Benchmark Candidate}},
  author = {Ganesh N. Pawar and Krzysztof G. Hełminiak and Nicola J. Miller and Frédéric Marcadon and Ayush Moharana and Tilaksingh B. Pawar and Anish Kalsi and Maciej Konacki},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.10786},
  eprint = {2609.10786},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.10786},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - UX Men: Detached Eclipsing Binary as a Benchmark Candidate
AU  - Ganesh N. Pawar
AU  - Krzysztof G. Hełminiak
AU  - Nicola J. Miller
AU  - Frédéric Marcadon
AU  - Ayush Moharana
AU  - Tilaksingh B. Pawar
AU  - Anish Kalsi
AU  - Maciej Konacki
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.10786
UR  - https://arxiv.org/abs/2609.10786
AB  - We present ultra-precise fundamental parameters for the detached eclipsing binary UX Men based on 31 TESS sectors (∼882 d) and radial velocities from HARPS, FEROS, CORALIE, and UCLES. The light curves were detrended for spot-induced variability and modelled independently with JKTEBOP and ALLESFITTER, while radial velocities were extracted via TODCOR and fitted with a Keplerian orbit. Spectral disentangling yielded individual component spectra analysed with iSpec to determine T_eff and [M/H]. Multi-band photometry was used to determine the fluxes, flux ratios and ultimately to measure photometric T_eff. We obtain the masses M_A = 1.2300 ±0.0012 M_⊙, M_B = 1.1946±0.0012 M_⊙ and radii R_A = 1.3605±0.0031 R_⊙, R_B = 1.2801±0.0069 R_⊙ with sub-percent precision. Uncertainties were found to be dominated by systematic effects coming from (weak) stellar activity. T_eff,A = 6302±77, T_eff,B = 6292±65 \& Metallicity estimates are [M/H]_A = 0.02±0.13 dex and [M/H]_B= 0.07±0.10 dex. Isochrone fitting yields a consistent age of τ = 2.75±0.13 Gyr. The system exhibits a ∼ 673-day periodicity in eclipse-timing variations, likely due to stellar activity, with no evidence for a third body. Results are independent of the modelling code used, but without proper treatment of activity-induced systematics the uncertainties would be underestimated. UX Men is a high-precision benchmark binary providing stringent tests of stellar models and a robust calibration source for PLATO. Expanding the sample of well-characterised detached eclipsing binaries will strengthen the empirical foundations for stellar physics and the calibration of future photometric missions
ER  -