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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.11575 |
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| _version_ | 1866918159624175616 |
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| author | O'Brien, Sean M. Schwamb, Megan E. Watson, Christopher A. Nielsen, Louise D. Bryant, Edward M. Casewell, Sarah L. Burleigh, Matthew R. Fortson, Lucy Gill, Samuel Lintott, Chris J. Hobbs, Katlyn L. Apergis, Ioannis Bayliss, Daniel Fernández, Jorge Fernández Günther, Maximilian N. Hawthorn, Faith Jenkins, James S. Kendall, Alicia McCormac, James de Mooij, Ernst J. W. Rodel, Toby Saha, Suman Trouille, Laura West, Richard G. Wheatley, Peter J. Agafitei, Marius Constantin Apaydın, Deniz Rüzgar Baeten, Elisabeth Baller, Bruce Carabott, Jeff Chesson, Sallyann Freigeiro, Sebastián Alejandro Gonano, Virgilio Hanke, Matthias Hermes, Pete Hildebrand, Avery Langley, John S. Lim, See Min McCarthy, Leo Ryan Mitchell, Graham O'Neill, Ken Pearson, Charles R. Reket, Nolan Riethmiller, Jeanne Saeftel, Juergen Sainio, Arttu Steiner, Charlie Strickland, Amanda Tanner, Christopher Terentev, Ivan A. Tiu, Ernest Jude P. Tumanov, Sergey Y. Urszula, Marciniak Vahlenkamp, Pia de Vroome, Femke Wantuch, Paweł Woodruff, Timothy |
| author_facet | O'Brien, Sean M. Schwamb, Megan E. Watson, Christopher A. Nielsen, Louise D. Bryant, Edward M. Casewell, Sarah L. Burleigh, Matthew R. Fortson, Lucy Gill, Samuel Lintott, Chris J. Hobbs, Katlyn L. Apergis, Ioannis Bayliss, Daniel Fernández, Jorge Fernández Günther, Maximilian N. Hawthorn, Faith Jenkins, James S. Kendall, Alicia McCormac, James de Mooij, Ernst J. W. Rodel, Toby Saha, Suman Trouille, Laura West, Richard G. Wheatley, Peter J. Agafitei, Marius Constantin Apaydın, Deniz Rüzgar Baeten, Elisabeth Baller, Bruce Carabott, Jeff Chesson, Sallyann Freigeiro, Sebastián Alejandro Gonano, Virgilio Hanke, Matthias Hermes, Pete Hildebrand, Avery Langley, John S. Lim, See Min McCarthy, Leo Ryan Mitchell, Graham O'Neill, Ken Pearson, Charles R. Reket, Nolan Riethmiller, Jeanne Saeftel, Juergen Sainio, Arttu Steiner, Charlie Strickland, Amanda Tanner, Christopher Terentev, Ivan A. Tiu, Ernest Jude P. Tumanov, Sergey Y. Urszula, Marciniak Vahlenkamp, Pia de Vroome, Femke Wantuch, Paweł Woodruff, Timothy |
| contents | We report the identification and characterization of a new binary system composed of two near-equal mass M-dwarfs. The binary NGTS-EB-8 was identified as a planet candidate in data from the Next Generation Transit Survey (NGTS) by citizen scientists participating in the Planet Hunters NGTS project. High-resolution spectroscopic observations reveal the system to be a double-lined binary. By modeling the photometric and radial velocity observations, we determine an orbital period of 4.2 days and the masses and radii of both stars to be $M_A=0.250^{+0.005}_{-0.004}$ M$_{\odot}$, $M_B=0.208^{+0.005}_{-0.004}$ M$_{\odot}$, $R_A=0.255^{+0.004}_{-0.005}$ R$_{\odot}$, $R_B=0.233^{+0.006}_{-0.005}$ R$_{\odot}$. We detect Balmer line emission from at least one of the stars but no significant flare activity. We note that both components lie in the fully convective regime of low-mass stars ($<0.35$ M$_{\odot}$), therefore can be a valuable test for stellar evolutionary models. We demonstrate that the photometric observations, speckle imaging and initial radial velocity measurements were unable to identify the true nature of this system and highlight that high-resolution spectroscopic observations are crucial in determining whether systems such as this are in fact binaries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11575 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | NGTS-EB-8: A double-lined eclipsing M+M binary discovered by citizen scientists O'Brien, Sean M. Schwamb, Megan E. Watson, Christopher A. Nielsen, Louise D. Bryant, Edward M. Casewell, Sarah L. Burleigh, Matthew R. Fortson, Lucy Gill, Samuel Lintott, Chris J. Hobbs, Katlyn L. Apergis, Ioannis Bayliss, Daniel Fernández, Jorge Fernández Günther, Maximilian N. Hawthorn, Faith Jenkins, James S. Kendall, Alicia McCormac, James de Mooij, Ernst J. W. Rodel, Toby Saha, Suman Trouille, Laura West, Richard G. Wheatley, Peter J. Agafitei, Marius Constantin Apaydın, Deniz Rüzgar Baeten, Elisabeth Baller, Bruce Carabott, Jeff Chesson, Sallyann Freigeiro, Sebastián Alejandro Gonano, Virgilio Hanke, Matthias Hermes, Pete Hildebrand, Avery Langley, John S. Lim, See Min McCarthy, Leo Ryan Mitchell, Graham O'Neill, Ken Pearson, Charles R. Reket, Nolan Riethmiller, Jeanne Saeftel, Juergen Sainio, Arttu Steiner, Charlie Strickland, Amanda Tanner, Christopher Terentev, Ivan A. Tiu, Ernest Jude P. Tumanov, Sergey Y. Urszula, Marciniak Vahlenkamp, Pia de Vroome, Femke Wantuch, Paweł Woodruff, Timothy Solar and Stellar Astrophysics Earth and Planetary Astrophysics We report the identification and characterization of a new binary system composed of two near-equal mass M-dwarfs. The binary NGTS-EB-8 was identified as a planet candidate in data from the Next Generation Transit Survey (NGTS) by citizen scientists participating in the Planet Hunters NGTS project. High-resolution spectroscopic observations reveal the system to be a double-lined binary. By modeling the photometric and radial velocity observations, we determine an orbital period of 4.2 days and the masses and radii of both stars to be $M_A=0.250^{+0.005}_{-0.004}$ M$_{\odot}$, $M_B=0.208^{+0.005}_{-0.004}$ M$_{\odot}$, $R_A=0.255^{+0.004}_{-0.005}$ R$_{\odot}$, $R_B=0.233^{+0.006}_{-0.005}$ R$_{\odot}$. We detect Balmer line emission from at least one of the stars but no significant flare activity. We note that both components lie in the fully convective regime of low-mass stars ($<0.35$ M$_{\odot}$), therefore can be a valuable test for stellar evolutionary models. We demonstrate that the photometric observations, speckle imaging and initial radial velocity measurements were unable to identify the true nature of this system and highlight that high-resolution spectroscopic observations are crucial in determining whether systems such as this are in fact binaries. |
| title | NGTS-EB-8: A double-lined eclipsing M+M binary discovered by citizen scientists |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.11575 |