期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 494, 期 3, 页码 3950-3961出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa928
关键词
binaries: eclipsing
资金
- UK Science and Technology Facilities Council (STFC) [ST/M001962/1]
- NASA Explorer Program
- STFC studentship
- STFC Ernest Rutherford Fellowship
- STFC [ST/P000495/1]
- CONICYT-PFCHA/Doctorado Nacional [21191829]
- European Research Council (ERC) [681601]
- STFC [ST/R003726/1, ST/S002642/1, ST/P000495/1, ST/T000406/1, ST/M001962/1] Funding Source: UKRI
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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