Revised temperatures for two benchmark M-dwarfs – outliers no more

Martin, David V; Armitage, Tayt; Duck, Alison; Swayne, Matthew I; Martínez, Romy Rodríguez; Sethi, Ritika; Stassun, Keivan G; Gaudi, B Scott; Gill, Sam; Sebastian, Daniel; Maxted, Pierre F L

Abstract

Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported to be hotter or colder by ≈1000 K in comparison with both models and the majority of other M-dwarfs in the literature. By modelling the secondary eclipses with both the original data and new data from TESS we derive significantly different temperatures: 2865 ± 27 for KIC 1571511B and 3081 ± 32 for HD 24465B from TESS and 3114 ± 32 K for HD 24465B from K2. These new temperatures are not outliers. Removing this discrepancy allows these M-dwarfs to be truly benchmarks. Our work also provides relief to stellar modellers. We encourage more measurements of M-dwarf effective temperatures with robust methods.

Citation

Martin, D. V., Armitage, T., Duck, A., Swayne, M. I., Martínez, R. R., Sethi, R., Stassun, K. G., Gaudi, B. S., Gill, S., Sebastian, D., & Maxted, P. F. L. (2024). Revised temperatures for two benchmark M-dwarfs – outliers no more. Monthly Notices of the Royal Astronomical Society, 1-10. https://doi.org/10.1093/mnras/stae2266

• Journal Article Type: Article
• Acceptance Date: Oct 21, 2024
• Online Publication Date: Oct 21, 2024
• Publication Date: Oct 21, 2024
• Deposit Date: Nov 14, 2024
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Pages: 1-10
• DOI: https://doi.org/10.1093/mnras/stae2266
• Keywords: stars: binaries-eclipsing, low-mass, fundamental parameters, techniques: photometric, spectroscopic
• Public URL: https://keele-repository.worktribe.com/output/972200