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

Jack S. Acton; Michael R. Goad; Liam Raynard; Sarah L. Casewell; James A. G. Jackman; Richard D. Alexander; David R. Anderson; Daniel Bayliss; Edward M. Bryant; Matthew R. Burleigh; Claudia Belardi; Benjamin F. Cooke; Philipp Eigmüller; Samuel Gill; James S. Jenkins; Monika Lendl; Tom Louden; James McCormac; Maximiliano Moyano; Louise D. Nielsen; Rosanna H. Tilbrook; Stéphane Udry; Christopher A. Watson; Richard G. West; Peter J. Wheatley; Jose I. Vines

doi:10.1093/mnras/staa928

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

Jack S. Acton, Michael R. Goad, Liam Raynard, Sarah L. Casewell, James A. G. Jackman, Richard D. Alexander, David R. Anderson, Daniel Bayliss, Edward M. Bryant, Matthew R. Burleigh, Claudia Belardi, Benjamin F. Cooke, Philipp Eigmüller, Samuel Gill, James S. Jenkins, Monika Lendl, Tom Louden, James McCormac, Maximiliano Moyano, Louise D. NielsenRosanna H. Tilbrook, Stéphane Udry, Christopher A. Watson, Richard G. West, Peter J. Wheatley, Jose I. Vines

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Abstract

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 $0.323^{+0.0014}_{-0.0037}$is large relative to the period and semi major axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses of MA = 0.426 ^{+0.0056}_{-0.0049} M⊙,MB = 0.455 ^{+0.0058}_{-0.0052} M⊙ and stellar radii RA = $0.461 ^{+0.038}_{-0.025} R⊙, RB = 0.411 ^{+0.027}_{-0.039} R⊙, 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.

Original language	English
Pages (from-to)	3950-3961
Journal	Monthly Notices of the Royal Astronomical Society
Volume	494
Issue number	3
Early online date	08 Apr 2020
DOIs	https://doi.org/10.1093/mnras/staa928
Publication status	Published - 01 May 2020

Keywords

binaries: eclipsing

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NGTS J214358.5−380102 – NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
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http://adsabs.harvard.edu/abs/2020MNRAS.494.3950A

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Acton, J. S., Goad, M. R., Raynard, L., Casewell, S. L., Jackman, J. A. G., Alexander, R. D., Anderson, D. R., Bayliss, D., Bryant, E. M., Burleigh, M. R., Belardi, C., Cooke, B. F., Eigmüller, P., Gill, S., Jenkins, J. S., Lendl, M., Louden, T., McCormac, J., Moyano, M., ... Vines, J. I. (2020). NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system. Monthly Notices of the Royal Astronomical Society, 494(3), 3950-3961. https://doi.org/10.1093/mnras/staa928

@article{25c3d116a07c4b03b841d3675f4a9a29,

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

abstract = "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\textasciicircum{}\{+0.0014\}\_\{-0.0037\}\$is large relative to the period and semi major axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses of MA = 0.426 \textasciicircum{}\{+0.0056\}\_\{-0.0049\} M⊙,MB = 0.455 \textasciicircum{}\{+0.0058\}\_\{-0.0052\} M⊙ and stellar radii RA = \$0.461 \textasciicircum{}\{+0.038\}\_\{-0.025\} R⊙, RB = 0.411 \textasciicircum{}\{+0.027\}\_\{-0.039\} R⊙, 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.",

keywords = "binaries: eclipsing",

author = "Acton, \{Jack S.\} and Goad, \{Michael R.\} and Liam Raynard and Casewell, \{Sarah L.\} and Jackman, \{James A. G.\} and Alexander, \{Richard D.\} and Anderson, \{David R.\} and Daniel Bayliss and Bryant, \{Edward M.\} and Burleigh, \{Matthew R.\} and Claudia Belardi and Cooke, \{Benjamin F.\} and Philipp Eigm{\"u}ller and Samuel Gill and Jenkins, \{James S.\} and Monika Lendl and Tom Louden and James McCormac and Maximiliano Moyano and Nielsen, \{Louise D.\} and Tilbrook, \{Rosanna H.\} and St{\'e}phane Udry and Watson, \{Christopher A.\} and West, \{Richard G.\} and Wheatley, \{Peter J.\} and Vines, \{Jose I.\}",

year = "2020",

month = may,

day = "1",

doi = "10.1093/mnras/staa928",

language = "English",

volume = "494",

pages = "3950--3961",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Acton, JS, Goad, MR, Raynard, L, Casewell, SL, Jackman, JAG, Alexander, RD, Anderson, DR, Bayliss, D, Bryant, EM, Burleigh, MR, Belardi, C, Cooke, BF, Eigmüller, P, Gill, S, Jenkins, JS, Lendl, M, Louden, T, McCormac, J, Moyano, M, Nielsen, LD, Tilbrook, RH, Udry, S, Watson, CA, West, RG, Wheatley, PJ & Vines, JI 2020, 'NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system', Monthly Notices of the Royal Astronomical Society, vol. 494, no. 3, pp. 3950-3961. https://doi.org/10.1093/mnras/staa928

TY - JOUR

T1 - NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system

AU - Acton, Jack S.

AU - Goad, Michael R.

AU - Raynard, Liam

AU - Casewell, Sarah L.

AU - Jackman, James A. G.

AU - Alexander, Richard D.

AU - Anderson, David R.

AU - Bayliss, Daniel

AU - Bryant, Edward M.

AU - Burleigh, Matthew R.

AU - Belardi, Claudia

AU - Cooke, Benjamin F.

AU - Eigmüller, Philipp

AU - Gill, Samuel

AU - Jenkins, James S.

AU - Lendl, Monika

AU - Louden, Tom

AU - McCormac, James

AU - Moyano, Maximiliano

AU - Nielsen, Louise D.

AU - Tilbrook, Rosanna H.

AU - Udry, Stéphane

AU - Watson, Christopher A.

AU - West, Richard G.

AU - Wheatley, Peter J.

AU - Vines, Jose I.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - 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 $0.323^{+0.0014}_{-0.0037}$is large relative to the period and semi major axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses of MA = 0.426 ^{+0.0056}_{-0.0049} M⊙,MB = 0.455 ^{+0.0058}_{-0.0052} M⊙ and stellar radii RA = $0.461 ^{+0.038}_{-0.025} R⊙, RB = 0.411 ^{+0.027}_{-0.039} R⊙, 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.

AB - 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 $0.323^{+0.0014}_{-0.0037}$is large relative to the period and semi major axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses of MA = 0.426 ^{+0.0056}_{-0.0049} M⊙,MB = 0.455 ^{+0.0058}_{-0.0052} M⊙ and stellar radii RA = $0.461 ^{+0.038}_{-0.025} R⊙, RB = 0.411 ^{+0.027}_{-0.039} R⊙, 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.

KW - binaries: eclipsing

U2 - 10.1093/mnras/staa928

DO - 10.1093/mnras/staa928

M3 - Article

SN - 0035-8711

VL - 494

SP - 3950

EP - 3961

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

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