Magnetic fields in six of nine T-Tauri stars show rotationally modulated variability that evolves in strength and spatial distribution over year-long baselines, with magnetic filling factors larger than temperature-derived spot areas.
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First-year SWAYS observations report a superflare on EK Draconis with no low-frequency radio signal, interpreted as evidence that dense coronae in active stars inhibit type II/III burst instabilities.
Synthetic spectra tests show Zeeman broadening recovers M dwarf magnetic field strengths more reliably with joint abundance fitting and WAIC selection than with free line strengths or BIC/AIC, which underestimate by 30-50% in active cases.
GJ 729 exhibits a weak, evolving large-scale magnetic field (50-145 G) and a persistent ~7 d radial velocity signal that could be a ~1.5-2 Earth-mass planet or residual stellar activity.
A multi-author review synthesizes cool-star magnetic activity diagnostics, solar analogues, rotation-activity relations, and surface-mapping methods for exoplanet science.
citing papers explorer
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Rotational Modulation and Long-Term Variability of Magnetic Fields in T-Tauri Stars with IGRINS
Magnetic fields in six of nine T-Tauri stars show rotationally modulated variability that evolves in strength and spatial distribution over year-long baselines, with magnetic filling factors larger than temperature-derived spot areas.
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Summary of the First Year of the Space Weather Around Young Suns Program: 900 Hours of Low-frequency Radio and Optical Data Dedicated to Young, Solar-type Stars
First-year SWAYS observations report a superflare on EK Draconis with no low-frequency radio signal, interpreted as evidence that dense coronae in active stars inhibit type II/III burst instabilities.
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Testing the reliability of magnetic field strength measurements for M dwarfs
Synthetic spectra tests show Zeeman broadening recovers M dwarf magnetic field strengths more reliably with joint abundance fitting and WAIC selection than with free line strengths or BIC/AIC, which underestimate by 30-50% in active cases.
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RedDots: Magnetic field of the nearby active M dwarf GJ 729, and a search for companions
GJ 729 exhibits a weak, evolving large-scale magnetic field (50-145 G) and a persistent ~7 d radial velocity signal that could be a ~1.5-2 Earth-mass planet or residual stellar activity.
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Magnetic activity in cool stars: manifestations and relevance to exoplanets
A multi-author review synthesizes cool-star magnetic activity diagnostics, solar analogues, rotation-activity relations, and surface-mapping methods for exoplanet science.