NGTS J214358.5−380102 – NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
Author
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Acton, Jack S.
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Goad, Michael R.
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Raynard, Liam
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Casewell, Sarah L.
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Jackman, James A. G.
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Alexander, Richard D.
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Anderson, David R.
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Bayliss, Daniel
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Bryant, Edward M.
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Burleigh, Matthew R.
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Belardi, Claudia
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Cooke, Benjamin F.
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Eigmuller, Philipp
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Gill, Samuel
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Jenkins, James S.
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Lendl, Monika
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Louden, Tom
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McCormac, James
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Moyano, Maximiliano
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Nielsen, Louise D.
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Tilbrook, Rossanna H.
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Udry, Stephane
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Watson, Christopher A.
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West, Richard G.
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Wheatley, Peter J.
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Vines, Jose I.
Admission date
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2020-07-28T23:22:26Z
Available date
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2020-07-28T23:22:26Z
Publication date
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2020
Cita de ítem
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MNRAS 494, 3950–3961 (2020)
es_ES
Identifier
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10.1093/mnras/staa928
Identifier
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https://repositorio.uchile.cl/handle/2250/176173
Abstract
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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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Patrocinador
dc.description.sponsorship
Science & Technology Facilities Council (STFC)
ST/M001962/1
National Aeronautics & Space Administration (NASA)
Science & Technology Facilities Council (STFC)
STFC Ernest Rutherford Fellowship
Science & Technology Facilities Council (STFC)
ST/P000495/1
CONICYT-PFCHA/Doctorado Nacional
21191829
European Research Council (ERC)
681601