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The Solar Neighborhood. LIII. M Dwarf Twin Binaries—One in Five Twin Sibling Pairs Are Mismatched in Activity and/or Rotation

  • Authors: Andrew A. Couperus, Todd J. Henry, Aman Kar, Wei-Chun Jao, Eliot Halley Vrijmoet, Rachel A. Osten

Andrew A. Couperus et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 12.

Rotation results from TESS-unpop for RTW 1123+8009 A and B, in the same general format as Figure 11. Data from sectors 14, 20, 21, 26, 40, 41, 47, 53, 60, 73, and 74 are merged in a joint analysis using the basic methods described in Section 8.1. The TESS-unpop data are blended for the two stars given their 9﹩\mathop{.}\limits^{^{\prime\prime} }﹩96 separation, but our apertures were manually chosen to partially minimize the blending, so the results are very similar but slightly different between the two cases. These specific periods are possibly rough half-harmonics of the adopted longer periods from L24, as discussed in Section 8.3.7.
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