A Monster CME Obscuring A Demon Star Flare
Sofia-Paraskevi Moschou, Jeremy J. Drake, Ofer Cohen, Julian D., Alvarado-Gomez, Cecilia Garraffo

TL;DR
This study models a Coronal Mass Ejection (CME) as the cause of X-ray absorption during a 1997 superflare on Algol, estimating its properties and energy based on observational data and solar CME relations.
Contribution
It presents a detailed analysis of a stellar CME associated with a superflare, using the ice-cream cone model and magnetic energy considerations to estimate CME parameters.
Findings
CME likely caused the observed X-ray absorption decay.
Estimated CME mass range: 2×10^{21}–2×10^{22} g.
Estimated CME kinetic energy range: 7×10^{35}–3×10^{38} erg.
Abstract
We explore the scenario of a Coronal Mass Ejection (CME) being the cause of the observed continuous X-ray absorption of the August 30 1997 superflare on the eclipsing binary Algol (the Demon Star). The temporal decay of the absorption is consistent with absorption by a CME undergoing self-similar evolution with uniform expansion velocity. We investigate the kinematic and energetic properties of the CME using the ice-cream cone model for its three-dimensional structure in combination with the observed profile of the hydrogen column density decline with time. Different physically justified length scales were used that allowed us to estimate lower and upper limits of the possible CME characteristics. Further consideration of the maximum available magnetic energy in starspots leads us to quantify its mass as likely lying in the range - g and kinetic energy…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
