Revised Temperatures For Two Benchmark M-dwarfs -- Outliers No More

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 approximately 1000 K in comparis...

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Main Authors Martin, David V, Armitage, Tayt, Duck, Alison, Swayne, Matthew I, Martínez, Romy Rodríguez, Sethi, Ritika, Gaudi, B. Scott, Gill, Sam, Sebastian, Daniel, Maxted, Pierre F. L
Format Journal Article
LanguageEnglish
Published 22.08.2022
Subjects
Physics - Earth and Planetary Astrophysics
Physics - Solar and Stellar Astrophysics
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Summary: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 approximately 1000 K in comparison with both models and the majority of the literature. By modelling the secondary eclipses with both the original data and new data from TESS we derive significantly different temperatures which 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.
DOI:10.48550/arxiv.2208.10510