New observational constraints on the winds of M dwarf stars

BE Wood, HR Müller, S Redfield, F Konow… - The Astrophysical …, 2021‏ - iopscience.iop.org
High-resolution UV spectra of stellar H i Lyα lines from the Hubble Space Telescope (HST)
provide observational constraints on the winds of coronal main-sequence stars, thanks to an …

[HTML][HTML] Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution

ÂRG Santos, D Godoy-Rivera, AJ Finley… - Frontiers in Astronomy …, 2024‏ - frontiersin.org
While the mission's primary goal was focused on exoplanet detection and characterization,
Kepler made and continues to make extraordinary advances in stellar physics. Stellar …

Powering stellar magnetism: energy transfers in cyclic dynamos of Sun-like stars

AS Brun, A Strugarek, Q Noraz, B Perri… - The Astrophysical …, 2022‏ - iopscience.iop.org
We use the anelastic spherical harmonic code to model the convective dynamo of solar-type
stars. Based on a series of 15 3D MHD simulations spanning four bins in rotation and mass …

Star-spots and magnetism: testing the activity paradigm in the Pleiades and M67

L Cao, MH Pinsonneault - Monthly Notices of the Royal …, 2022‏ - academic.oup.com
We measure star-spot filling fractions for 240 stars in the Pleiades and M67 open star
clusters using APOGEE high-resolution H-band spectra. For this work, we developed a …

Three-dimensional Simulations of Magnetospheric Accretion in a T Tauri Star: Accretion and Wind Structures Just Around the Star

S Takasao, K Tomida, K Iwasaki… - The Astrophysical …, 2022‏ - iopscience.iop.org
We perform three-dimensional (3D) magnetohydrodynamic simulations of magnetospheric
accretion in a T Tauri star to study the accretion and wind structures in the close vicinity of …

Hidden magnetic fields of young suns

O Kochukhov, T Hackman, JJ Lehtinen… - Astronomy & …, 2020‏ - aanda.org
Global magnetic fields of active solar-like stars are, nowadays, routinely detected with
spectropolarimetric measurements and are mapped with Zeeman Doppler imaging (ZDI) …

Numerical quantification of the wind properties of cool main sequence stars

JJ Chebly, JD Alvarado-Gómez… - Monthly Notices of …, 2023‏ - academic.oup.com
As a cool star evolves, it loses mass and angular momentum due to magnetized stellar
winds that affect its rotational evolution. This change has consequences that range from the …

Weakened Magnetic Braking in the Exoplanet Host Star 51 Peg

TS Metcalfe, KG Strassmeier, IV Ilyin… - The Astrophysical …, 2024‏ - iopscience.iop.org
The consistently low activity level of the old solar analog 51 Peg not only facilitated the
discovery of the first hot Jupiter, but also led to the suggestion that the star could be …

The impact of metallicity on the evolution of the rotation and magnetic activity of Sun-like stars

L Amard, SP Matt - The Astrophysical Journal, 2020‏ - iopscience.iop.org
The rotation rates and magnetic activity of Sun-like and low-mass (≲ 1.4M⊙) main-
sequence stars are known to decline with time, and there now exist several models for the …

The space weather around the exoplanet GJ 436b-II. Stellar wind–exoplanet interactions

AA Vidotto, V Bourrier, R Fares, S Bellotti… - Astronomy & …, 2023‏ - aanda.org
The M dwarf star GJ 436 hosts a warm-Neptune that is losing a substantial amount of
atmosphere, which is shaped by the interactions with the wind of the host star. The stellar …