CONICET | Buscador de Institutos y Recursos Humanos

INVESTIGADORES

VILLARREAL D'ANGELO Carolina Susana

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artículos

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Título:

Slingshot prominences: characteristics and evolution

Autor/es:

VILLARREAL D'ANGELO, CAROLINA; JARDINE, MOIRA

Lugar:

Lyon

Reunión:

Conferencia; European Week of Astronomy and Space Science; 2019

Institución organizadora:

Universite de Lyon

Resumen:

Slingshot prominence phenomena have been detected in singleand binary G and K type stars for many years now. These prominences carry awayboth mass and angular momentum when they are ejected and the impact of thismass on any orbiting planets may be important for the evolution of exoplanetaryatmospheres.By means of the classification used in the massive starcommunity, that involves knowledge of two parameters (the co-rotation andAlfv_en radii), we have determined which stars could support prominences in asample of cool stars. For these stars we have characterise these phenomena,employing a simple model of mechanical support, and determine the prominencemass, mass loss rate and lifetime. Our calculated masses and ejection frequencies(typically 10^16 10^17 g and 0.4 daysrespectively) are consistent with observational values like the ones found forAB Dor. More over, motivated by the fact that our Sun doesn?texhibit this phenomena today, we have determine the time period for thepresence of slingshot prominences in the life of a solar-like star by using arotational evolution code. We find that for stars with an initial rotation ratelarger than 4.6 times the solar rotation rate, about half of all solar massstars, slingshot prominences will be present even after the star reaches themain sequence phase. In a fast rotator, this means that prominences can formuntil the star reaches ~ 800 Myr old. Our results also indicate that the massand lifetime of this type of prominence have maximum values when the starreaches the ZAMS at an age of ~ 40 Myr for a solar mass star.

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