Implications of Recent Stellar Wind Measurements

Abstract

Very recent measurements of stellar winds are used to update relations between winds and coronal activity. New wind constraints include an upper limit of Mdot<0.1 Mdot_sun for Tau Ceti (G8 V), derived from a nondetection of astrospheric H I Lyman-alpha absorption. This upper limit is reported here for the first time, and represents the weakest wind constrained using the astrospheric absorption technique. A high mass loss rate measurement of Mdot=10 Mdot_sun for Delta Pav (G8 IV) from astrospheric Lyman-alpha absorption suggests stronger winds for subgiants than for main sequence stars of equivalent activity. A very low mass-loss rate of Mdot~0.06 Mdot_sun recently estimated for GJ 436 (M3 V) from Lyman-alpha absorption from an evaporating exoplanetary atmosphere implies inactive M dwarfs may have weak winds compared with GK dwarfs of similar activity.

To appear in the Proceedings of the 17th Annual Astrophysics Conference: Dissipative and Heating Processes in Collisionless Plasma: The Solar Corona, the Solar Wind, and the Interstellar Medium, IOP Conference Series

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• The evolution of the solar wind
• Tuning the Exo-Space Weather Radio for Stellar Coronal Mass Ejections
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• Stellar Winds Drive Strong Variations in Exoplanet Evaporative Outflows and Transit Absorption Signatures
• Origin of radio-quiet coronal mass ejections in flare stars
• Magnetic and Rotational Evolution of $\rho$ CrB from Asteroseismology with TESS
• Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and $\tau$ Cet
• Coronal mass ejections and type II radio emission variability during a magnetic cycle on the solar-type star $\epsilon$ Eridani
• Breezing through the space environment of Barnard's Star b
• Discovery of a young pre-intermediate polar
• Weakened Magnetic Braking Signals the Collapse of the Global Stellar Dynamo
• Testing the Rossby Paradigm: Weakened Magnetic Braking in early K-type Stars
• Estimating the Mass Escaping Rates of Radius-valley-spanning Planets in the TOI-431 System via X-Ray and Ultraviolet Evaporation
• Anti-Solar Differential Rotation May Have Revived Magnetic Braking in the Subgiant 31 Aquilae