| Full text | |
| Author(s): |
Gonzalez, R. F.
;
Zapata, L. A.
;
Raga, A. C.
;
Canto, J.
;
Velazquez, P. F.
;
de Gouveia Dal Pino, E. M.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 659, p. 6-pg., 2022-03-22. |
| Abstract | |
In this work, we present new 2D hydrodynamical simulations of the major eruption of eta Car in the 1840s, which resulted in the formation of a bipolar nebula that is commonly known as the large Homunculus. In our numerical models, we have included the high-speed component of 10 000 km s(-1), which was detected in recent observations, providing direct evidence of an explosive event. Here, we investigate whether such a violent explosion is able to explain both the shape and the dynamical evolution of eta Car's nebula. As in our previous work, we have assumed a two-stage scenario for eta Car's eruption: a slow outflow phase for a few decades before the eruption, followed by the explosive event. From the collision of these outflow phases, the large Homunculus is produced. Our numerical simulations show that such a scenario does not resemble some of the observed physical features and the expansion of the nebula. Notwithstanding, we also explore other injection parameters (mass-loss rate and ejection velocity) for these outflow phases. In particular, we find that an explosion with an intermediate speed of 1000 km s(-1) is able to reproduce the morphology and the kinematical age of the large Homunculus. (AU) | |
| FAPESP's process: | 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA) |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support Opportunities: | Special Projects |