The Spin–orbit alignment of two short period eclipsing binary systems
Article
Wells, Tony, Addison, B. C., Wittenmyer, R. A., Wright, Duncan J., Fairnington, Tyler R., Dittmann, Jason, Horner, Jonathan, Kane, Stephen R., Kielkopf, John, Plavchan, Peter and Shporer, Avi. 2025. "The Spin–orbit alignment of two short period eclipsing binary systems." Monthly Notices of the Royal Astronomical Society. 542 (3), pp. 2269-2291. https://doi.org/10.1093/mnras/staf1355
| Article Title | The Spin–orbit alignment of two short period eclipsing binary systems |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | Wells, Tony, Addison, B. C., Wittenmyer, R. A., Wright, Duncan J., Fairnington, Tyler R., Dittmann, Jason, Horner, Jonathan, Kane, Stephen R., Kielkopf, John, Plavchan, Peter and Shporer, Avi |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 542 (3), pp. 2269-2291 |
| Number of Pages | 23 |
| Year | 2025 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staf1355 |
| Web Address (URL) | https://academic.oup.com/mnras/article/542/3/2269/8238080 |
| Abstract | We present a joint analysis of TESS photometry and radial velocity measurements obtained from the Minerva–Australis facility for two short-period eclipsing binaries, TIC 48227288 and TIC 339607421. TIC 339607421 hosts an M-dwarf companion ( M, R) orbiting an F6V star ( M, R), while TIC 48227288 contains a late K class companion ( M, R) orbiting an F3V star ( M, R). Both companions follow short period, near-circular orbits ( = 2.4–3.0 d, ). Sky-projected obliquities for each system were derived using a classical analysis of the RV perturbation and the Reloaded Rossiter–McLaughlin (RRM) technique. The classical method indicates minor spin–orbit misalignment for both systems ( and for TIC 339607421 and TIC 48227288, respectively). The RRM analysis yields smaller obliquities ( and respectively), but confirms the minor misalignment inferred from the classical analysis. The findings of misaligned, circular orbits are notable even though the misalignments are not large, and suggest potential gaps in current models of binary formation and orbital evolution. As such, further investigation of these and similar systems appears warranted. |
| Keywords | techniques: photometric; techniques: radial velocities; techniques: spectroscopic; binaries: eclipsing; stars: fundamental parameters; stars: low-mass |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Centre for Astrophysics |
| School of Science, Engineering and Digital Technologies | |
| Swinburne University of Technology | |
| Institute for Space, Defence and Advanced Technologies | |
| University of Florida, United States | |
| University of California Riverside, United Sates | |
| University of Louisville, United States | |
| George Mason University, United States | |
| Massachusetts Institute of Technology, United States |
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