Fast Ejecta Resulted from Jet-Wind Interaction in the Great Eruption of Eta Carinae

Abstract

The accretion model for the nineteenth century Great Eruption (GE) of $\eta$ Carinae suggests that mass outflowing from the primary was accreted onto the secondary, and the gravitational energy of that mass accounts for the increase in luminosity and most of the kinetic energy of the ejecta. It further argues that the accretion was accompanied by the ejection of two jets that shaped the bipolar Homunculus nebula. Observations of echos from the GE found emission lines with broad wings suggesting some of the mass in equatorial directions reached more than $10000\mathrm{km}{\mathrm{s}}^{-1}$. We run hydrodynamic simulations following periastron passage during the GE, launching jets from the secondary as it accreted gas erupted from the primary. We then follow the interaction of the polar jets with the surrounding primary wind, as they accelerate part of the flow to velocities $>10000\mathrm{km}{\mathrm{s}}^{-1}$ and deflect it towards lower latitudes. We find that the amount of mass that reached these high velocities during the GE is $M_h\approx 0.02{\mathrm{M}}_{\odot }$. This value reaches maximum and then decreases with time. Our simulations agree with previous results of the accretion model from which we estimate $M_h$ taking into account the energy budget of the GE. The accretion model can explain the observations of high velocity gas in light echos with the known two stars, and a triple star system is not required.

Accepted for publication in MNRAS

References in corpus (9)

• Pulsational Pair-Instability Supernovae
• A Blast Wave from the 1843 Eruption of Eta Carinae
• Possible Implications of Mass Accretion in Eta Carinae
• Ancient eruptions of Eta Carinae: A tale written in proper motions
• The Structure of the Homunculus. II. Modeling the physical conditions in Eta Car's molecular shell
• Hydrodynamical simulations and similarity relations for eruptive mass loss from massive stars
• Eta Carinae's 2014.6 Spectroscopic Event: Clues to the Long-term Recovery from its Great Eruption
• $\eta$ Carinae Baby Homunculus Uncovered by ALMA
• Accretion at the periastron passage of Eta Carinae

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