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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 11.

Example useful rotation results from various external data sources are shown for stars in our New Systems, following the same general format as Figure 10, but without the gray shaded noise regions in the 0.9 m plots. The TESS-unpop data for LP 719–37 AB are blended, but we show results from two different sectors that correspond to the disentangled periods for each star. LP 368–99 A and B are moderately blended in ZTF, but their PSF-fit photometry yields resolved rotation results. RTW 2202+5537 A and B are blended in TESS-unpop, but the resolved ZTF data for B allow us to disentangle the true rotation signal for each star. The TESS data for RTW 0409+4623 AB are blended, but the periodogram demonstrates the two peaks corresponding to the two distinct rotation signals we adopt. RTW 2311–5845 A shows an example result based on resolved Gaia DR3 data that helps confirm the system’s rotation periods.
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