NGTS J214358.5-380102 -- NGTS discovery of the most eccentric known eclipsing M-Dwarf binary system
| Autor: | Acton, Jack S., Goad, Michael R., Raynard, Liam, Casewell, Sarah L., Jackman, James A. G., Alexander, Richard D., Anderson, David R., Bayliss, Daniel, Bryant, Edward M., Burleigh, Matthew R., Belardi, Claudia, Cooke, Benjamin F., Eigmüller, Phillip, Gill, Samuel, Jenkins, James S., Lendl, Monika, Louden, Tom, McCormac, James, Moyano, Maximiliano, Nielsen, Louise D., Tilbrook, Rosanna H., Udry, Stéphane, Watson, Christopher A., West, Richard G., Wheatley, Peter J., Vines, Jose I. |
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| Rok vydání: | 2020 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/staa928 |
| Popis: | We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarf binary discovered by the Next Generation Transit Survey. The system period of 7.618 days 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 indicate stellar masses of $M_A$=$0.426 ^{+0.0056}_{-0.0049}$, $M_B$=$0.455 ^{+0.0058}_{-0.0052}$ and stellar radii $R_A$=$0.461 ^{+0.038}_{-0.025}$ $R_B$=$0.411 ^{+0.027}_{-0.039}$, 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 SED 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 circularisation of stellar orbits. Comment: Accepted for Publication in MNRAS |
| Databáze: | arXiv |
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