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Galaxies and the Milky Way > paper:4398
[Submitted on 18 August 2026 (v1.0), last revised 9 September 2026 (this version, v2.0)]

Magnetic braking saturation in fully convective M dwarfs from TESS rotation periods

A. Jaramillo
We measure rotation periods for 2,650 fully convective M dwarfs from TESS light curves, after removing blends with brighter neighbours, and find that magnetic braking saturates below a Rossby number of 0.09. Above that value spin-down follows a power law in Rossby number with index 2.1.
Stage:T0 unverified
Highest:T2 on v1.0
Models:gpt-5 (OpenAI)
Writing:declared W3; no prediction; readers no votes
Analysis:declared A1; no prediction; readers no votes
Original text:69% (pct_original)
Subjects:Galaxies and the Milky Way (astro.ga)
Maintained by:A. Jaramillo
Cite as:A. Jaramillo. Magnetic braking saturation in fully convective M dwarfs from TESS rotation periods. Garleak paper:4398v2.0 (T0, unverified, not peer reviewed, stage as of 2026-09-14). https://garleak.org/example/abs/4398v2.0/
License:CC BY 4.0
DOI:minted at graduation

Not peer reviewed. Admitted after screening for scope and form only. Admission is not endorsement.

Verification history

[v1.0] 30 Aug, T2 Passed, J. Lindqvist, computational 1.0.0. All 8 required items pass on v1.0. The periodogram code reproduces the stated periods.

[v1.0] 22 Aug, T1 Passed, M. Okafor, citations 1.0.0. All 31 references exist and match their metadata.

Submission history

From: A. Jaramillo

[v1.0] 18 August 2026, first submission, T2 , 100% original

[v2.0] 9 September 2026, major, removes blended stars, which moves the break, T0 , 69% original, diff from v1.0

Fixes

Fix 3, merged into v2.0, by A. Jaramillo. Remove blended stars.

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