166 citations · 1.1k across the 42 of their papers we have counts for
42 papers
Intense but Harmless: Exo-Space Weather Around an M Dwarf with a Single-Hemisphere Dynamo
Zheng Sun, Julián D. Alvarado-Gómez, Hui Tian +4
M dwarfs are among the most promising host stars in the search for habitable exoplanets. However, their active atmospheres drive intense magnetic activity, including energetic flar…
Star Planet Interactions
Arghyadeep Paul, Kristina Kislyakova, Manuel Güdel +13
Star-planet interactions (SPIs) describe the continuous exchange of energy, momentum, and mass between exoplanets and their host stars through radiative, tidal, magnetic, and parti…
How Magnetic Field Strength Affects Stellar Coronal Mass Ejection Dynamics
Zheng Sun, Julián D. Alvarado-Gómez, Hui Tian
Observations show that stellar coronal mass ejection (CME) candidates display relatively lower kinetic energies compared to expectations from solar flare-CME relations extrapolated…
Stellar Forcing of (exo)Planetary Environments
Julián D. Alvarado-Gómez, Erika Palmerio, Manuel Güdel +13
The environments of exoplanets are fundamentally shaped by the magnetic activity of their host stars through radiative, plasma, and particle-driven processes. This article presents…
Experimental evidence for coronal mass ejection suppression in strong stellar magnetic fields
S. N. Chen, K. Burdonov, W. Yao +10
Solar coronal mass ejections (CME) are routinely observed, but as of yet there exist few convincing detections of stellar CMEs. A reason for this could be the stronger magnetic fie…
A predictive framework for realistic star planet radio emission in compact systems
J. J. Chebly, C. K. Louis, A. Strugarek +2
Radio emission from star planet interactions (SPI) beyond our solar system has yet to be firmly detected, primarily due to challenges such as weak signals, directional beaming effe…
High-Resolution Modelling of Coronae and Winds in Solar-type Stars with Varying Rotation Rates I. X-ray Coronae
Yue-Hong Chen, Julián D. Alvarado-Gómez, Xin Cheng +8
Stellar coronae are believed to be the main birthplace of various stellar magnetic activities. However, the structures and properties of stellar coronae remain poorly understood. U…
Simulations of coronal mass ejections on a young solar-type star and their detectability through coronal spectral observations
Yu Xu, Hui Tian, Julián D. Alvarado-Gómez +2
There is a growing interest in searching for coronal mass ejections (CMEs) in other stellar systems because they are thought to be one of the important factors shaping planetary at…
Simulated Coronal Mass Ejections on a young Solar-Type Star and the Associated Instantaneous Angular Momentum Loss
Yu Xu, Julián D. Alvarado-Gómez, Hui Tian +3
Coronal mass ejections (CMEs) on stars can change the stars' magnetic field configurations and mass loss rates during the eruption and propagation and therefore, may affect the sta…
Heating of the Atmospheres of Short-orbit Exoplanets by Their Rapid Orbital Motion Through an Extreme Space Environment
Ofer Cohen, Alex Glocer, Cecilia Garraffo +4
Exoplanets with short orbit period reside very close to their host stars. They transition very rapidly between different sectors of the circumstellar space environment along their…
Numerical quantification of the wind properties of cool main sequence stars
Judy Chebly, Julián D. Alvarado-Gómez, Katja Poppenhäger +1
As a cool star evolves, it loses mass and angular momentum due to magnetized stellar winds which affect its rotational evolution. This change has consequences that range from the a…
Three-dimensional, Time-dependent MHD Simulation of Disk-Magnetosphere-Stellar Wind Interaction in a T Tauri, Protoplanetary System
Ofer Cohen, Cecilia Garraffo, Jeremy Drake +4
We present a three-dimensional, time-dependent, MHD simulation of the short-term interaction between a protoplanetary disk and the stellar corona in a T Tauri system. The simulatio…
Revisiting the space weather environment of Proxima Centauri b
Cecilia Garraffo, Julián D. Alvarado-Gómez, Ofer Cohen +1
Close-in planets orbiting around low-mass stars are exposed to intense energetic photon and particle radiation and harsh space weather. We have modeled such conditions for Proxima…
Quantification of the environment of cool stars using numerical simulations
J. J. Chebly, J. D. Alvarado-Gómez, K. Poppenhaeger
Stars interact with their planets through gravitation, radiation, and magnetic fields. Although magnetic activity decreases with time, reducing associated high-energy (e.g., corona…
Connecting Solar and Stellar Flares/CMEs: Expanding Heliophysics to Encompass Exoplanetary Space Weather
B. J. Lynch, B. E. Wood, M. Jin +25
The aim of this white paper is to briefly summarize some of the outstanding gaps in the observations and modeling of stellar flares, CMEs, and exoplanetary space weather, and to di…
Stellar Energetic Particle Transport in the Turbulent and CME-disrupted Stellar Wind of AU~Microscopii
F. Fraschetti, J. D. Alvarado-Gómez, J. J. Drake +2
Energetic particles emitted by active stars are likely to propagate in astrospheric magnetized plasma turbulent and disrupted by the prior passage of energetic Coronal Mass Ejectio…
Space Weather-driven Variations in Ly Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b
O. Cohen, J. D. Alvarado-Gomez, J. J. Drake +3
We simulate the space environment around AU Microscopii b and the interaction between the magnetized stellar wind with a planetary atmospheric outflow for ambient stellar wind cond…
The PEPSI Exoplanet Transit Survey (PETS) I: Investigating the presence of a silicate atmosphere on the super-Earth 55 Cnc e
Engin Keles, Matthias Mallonn, Daniel Kitzmann +26
The study of exoplanets and especially their atmospheres can reveal key insights on their evolution by identifying specific atmospheric species. For such atmospheric investigations…
Simulating the Space Weather in the AU Mic System: Stellar Winds and Extreme Coronal Mass Ejections
Julián D. Alvarado-Gómez, Ofer Cohen, Jeremy J. Drake +7
Two close-in planets have been recently found around the M-dwarf flare star AU Microscopii (AU Mic). These Neptune-sized planets (AU Mic b and c) seem to be located very close to t…
Localizing flares to understand stellar magnetic fields and space weather in exo-systems
Ekaterina Ilin, Katja Poppenhäger, Julián D. Alvarado-Gómez
Stars are uniform spheres, but only to first order. The way in which stellar rotation and magnetism break this symmetry places important observational constraints on stellar magnet…
Destination exoplanet: Habitability conditions influenced bystellar winds properties
Judy J. Chebly, Julián D. Alvarado-Gómez, Katja Poppenhaeger
The cumulative effect of the magnetized stellar winds on exoplanets dominates over other forms of star-planet interactions. When combined with photoevaporation, these winds will le…
Coronal Mass Ejections and Exoplanets: A Numerical Perspective
Julián D. Alvarado-Gómez, Jeremy J. Drake, Ofer Cohen +3
Coronal mass ejections (CMEs) are more energetic than any other class of solar phenomena. They arise from the rapid release of up to erg of magnetic energy mainly in the…
Giant white-light flares on fully convective stars occur at high latitudes
Ekaterina Ilin, Katja Poppenhaeger, Sarah J. Schmidt +7
White-light flares are magnetically driven localized brightenings on the surfaces of stars. Their temporal, spectral, and statistical properties present a treasury of physical info…
A multi-wavelength look at the GJ 9827 system -- No evidence of extended atmospheres in GJ 9827 b and d from HST and CARMENES data
Ilaria Carleo, Allison Youngblood, Seth Redfield +18
GJ9827 is a bright star hosting a planetary system with three transiting planets. As a multi-planet system with planets that sprawl within the boundaries of the radius gap between…