4.7 Article

NGTS J214358.5-380102-NGTS discovery of the most eccentric known eclipsing M-dwarf binary system

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 494, Issue 3, Pages 3950-3961

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa928

Keywords

binaries: eclipsing

Funding

  1. UK Science and Technology Facilities Council (STFC) [ST/M001962/1]
  2. NASA Explorer Program
  3. STFC studentship
  4. STFC Ernest Rutherford Fellowship
  5. STFC [ST/P000495/1]
  6. CONICYT-PFCHA/Doctorado Nacional [21191829]
  7. European Research Council (ERC) [681601]
  8. STFC [ST/R003726/1, ST/S002642/1, ST/P000495/1, ST/T000406/1, ST/M001962/1] Funding Source: UKRI

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We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarf binary discovered by the Next-Generation Transit Survey (NGTS). The system period of 7.618 d is greater than many known eclipsing M-dwarf binary systems. Its orbital eccentricity of 0.323(-0.0037)(+0.0014) is large relative to the period and semimajor axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses of M-A = 0.426(-0.0049)(+0.0056)M(circle dot), M-B = 0.455(-0.0052)(+0.0058) M(circle dot )and stellar radii R-A = 0.461(-0.025)(+0.038)R(circle dot) , R-B = 0.411(-0.039)(+0.027)R(circle dot), respectively. Comparisons with stellar models for low-mass stars show that one star is consistent with model predictions whereas the other is substantially oversized. Spectral analysis of the system suggests a primary of spectral type M3V, consistent with both modelled masses and radii, and with spectral energy distribution fitting of NGTS photometry. As the most eccentric eclipsing M-dwarf binary known, NGTS J214358.5-380102 provides an interesting insight into the strength of tidal effects in the circularization of stellar orbits.

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