Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ò Eridani
Article
Article Title | Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ò Eridani |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | O Fionnagain, Dualta (Author), Kavanagh, Robert D. (Author), Vidotto, Aline A. (Author), Jeffers, Sandra V. (Author), Petit, Pascal (Author), Marsden, Stephen (Author), Morin, Julien (Author) and Golden, Aaron (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 924 (2), pp. 1-13 |
Article Number | 115 |
Number of Pages | 13 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ac35de |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ac35de |
Abstract | We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate the radio emission frequencies associated with these events. These stellar eruptions have proven to be elusive, although a promising approach to detect and characterize these phenomena are low-frequency radio observations of potential type II bursts as CME-induced shocks propagate through the stellar corona. Stellar type II radio bursts are expected to emit below 450 MHz, similarly to their solar counterparts. We show that the length of time these events remain above the ionospheric cutoff is not necessarily dependent on the stellar magnetic cycle, but more on the eruption location relative to the stellar magnetic field. We find that these type II bursts would remain within the frequency range of LOFAR for a maximum of 20-30 minutes post-eruption for the polar CMEs (50 minutes for second harmonics). We find evidence of slower equatorial CMEs, which result in slightly longer observable windows for the 2008 and 2013 simulations. Stellar magnetic geometry and strength have a significant effect on the detectability of these events. We place the CMEs in the context of the stellar mass-loss rate (27-48× solar mass-loss rate), showing that they can amount to 3%-50% of the stellar wind mass-loss rate for Eridani. Continuous monitoring of likely stellar CME candidates with low-frequency radio telescopes will be required to detect these transient events. |
Keywords | Magnetohydrodynamical simulations (1966); Radio bursts (1339); Stellar winds (1636); Stellar coronal mass ejections (1881) |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | National University of Ireland, Ireland |
University of Dublin, Ireland | |
Max Planck Society, Germany | |
University of Toulouse, France | |
Centre for Astrophysics | |
University of Montpellier, France | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7vxv/coronal-mass-ejections-and-type-ii-radio-emission-variability-during-a-magnetic-cycle-on-the-solar-type-star-eridani
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