![TiO absorption variation during 8 years on surface of proxima centauri. Vertical lines depicts regions were used to measure B index. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Titanium-Oxide.png?fit=1200%2C669&ssl=1)
[astro-ph.SR] Stellar activity cycles on magnetically active stars can be estimated by molecular absorption bands.
We have previously introduced a molecular index which compares absorptional line strength of the TiO567nm with its nearby continuum has previously been introduced.
In this work we use this indicator to evaluation long-term activity variations for Proxima Centauri star, using spectroscopic data from HARPS.
The results indicate periodicity with an activity period of 2873(+47.4-53.9) days, which is similar to the previous measurements from other indicators.
Fatemeh Azizi, Mohammad Taghi Mirtorabi, Rahimeh Foroughi
Comments: 11 pages, 3 figures
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2608.12686 [astro-ph.SR] (or arXiv:2608.12686v1 [astro-ph.SR] for this version)
https://doi.org/10.48550/arXiv.2608.12686
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Journal reference: Astrophysics and Space Science,2025
Submission history
From: Fatemeh Azizi
[v1] Thu, 13 Aug 2026 01:04:40 UTC (654 KB)
https://arxiv.org/abs/2608.12686
Astrobiology, Exoplanet
