73 citations · 268 across the 16 of their papers we have counts for
12 papers · 1 filter
Magnetic activity in cool stars: manifestations and relevance to exoplanets
E. Işık, A. Valio, A. Strugarek +10
Understanding stellar magnetic activity is central to exoplanet science in two ways: it sets the dynamic astrospheric boundary condition governing planetary space environments, and…
Fine-scale downflows above flare ribbons captured by Solar Orbiter/EUI
Zheng Sun, Alexander G. M. Pietrow, Malcolm K. Druett +8
In solar flares, flare ribbons map chromospheric footpoints where flare energy deposition occurs. These locations are associated with field aligned energy transport from the corona…
Far beyond the Sun: III. The magnetic cycle of Horologii
Julián D. Alvarado-Gómez, Gaitee A. J. Hussain, Eliana M. Amazo-Gómez +6
We present a comprehensive investigation of the magnetic cycle of the young, active solar analogue Horologii ( Hor) based on intensive spectropolarimetric monitoring using H…
Planetary perturbers: Flaring star-planet interactions in Kepler and TESS
Ekaterina Ilin, Katja Poppenhäger, Judy Chebly +2
In many star-planet systems discovered so far, the innermost planet orbits within only a few stellar radii. In these systems, planets could become in-situ probes of the extended st…
Far beyond the Sun: II. Probing the stellar magnetism of the young Sun ι Horologii from the photosphere to its corona
E. M. Amazo-Gómez, J. D. Alvarado-Gómez, K. Poppenhaeger +14
A comprehensive multi-wavelength campaign has been carried out to probe stellar activity and variability in the young Sun-like star -Horologii. We present the results from long-…
Solar Hα excess during Solar Cycle 24 from full-disk filtergrams of the Chromospheric Telescope
A. Diercke, C. Kuckein, P. W. Cauley +4
The chromospheric H-alpha spectral line is a strong line in the spectrum of the Sun and other stars. In the stellar regime, this spectral line is already used as a powerful tracer…
Multi-wavelength variability of the young solar analog iota Hor. X-ray cycle, star spots, flares, and UV emission
J. Sanz-Forcada, B. Stelzer, M. Coffaro +2
Chromospheric activity cycles are common in late-type stars; however, only a handful of coronal activity cycles have been discovered. \ihor\ is the most active and youngest star wi…
Far beyond the Sun: I. The beating magnetic heart in Horologium
Julián D. Alvarado-Gómez, Gaitee A. J. Hussain, Jeremy J. Drake +10
A former member of the Hyades cluster, Horologii ( Hor) is a planet-hosting Sun-like star which displays the shortest coronal activity cycle known to date (…
Simulating the environment around planet-hosting stars - II. Stellar winds and inner astrospheres
J. D. Alvarado-Gómez, G. A. J. Hussain, O. Cohen +4
We present the results of a comprehensive numerical simulation of the environment around three exoplanet-host stars (HD 1237, HD 22049, and HD 147513). Our simulations consider one…
Simulating the Environment Around Planet-Hosting Stars - I. Coronal Structure
J. D. Alvarado-Gómez, G. A. J. Hussain, O. Cohen +4
We present the results of a detailed numerical simulation of the circumstellar environment around three exoplanet-hosting stars. A state-of-the-art global magnetohydrodynamic (MHD)…
A spectro-polarimetric study of the planet-hosting G dwarf, HD 147513
Gaitee A. J. Hussain, Julian David Alvarado-Gómez, Jason Grunhut +12
The results from a spectro-polarimetric study of the planet-hosting Sun-like star, HD 147513 (G5V), are presented here. Robust detections of Zeeman signatures at all observed epoch…
Activity and Magnetic Field Structure of the Sun-Like Planet Hosting Star HD 1237
J. D. Alvarado-Gómez, G. A. J. Hussain, J. Grunhut +13
We analyse the magnetic activity characteristics of the planet hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational mod…