Ztráta hmoty z dvojhvězd
| Název práce v češtině: | Ztráta hmoty z dvojhvězd |
|---|---|
| Název v anglickém jazyce: | Mass loss from binary stars |
| Akademický rok vypsání: | 2017/2018 |
| Typ práce: | bakalářská práce |
| Jazyk práce: | čeština |
| Ústav: | Ústav teoretické fyziky (32-UTF) |
| Vedoucí / školitel: | doc. Mgr. Ondřej Pejcha, Ph.D. |
| Řešitel: | skrytý - zadáno a potvrzeno stud. odd. |
| Datum přihlášení: | 31.10.2017 |
| Datum zadání: | 06.11.2017 |
| Datum potvrzení stud. oddělením: | 11.07.2018 |
| Datum a čas obhajoby: | 13.09.2018 09:00 |
| Datum odevzdání elektronické podoby: | 17.07.2018 |
| Datum odevzdání tištěné podoby: | 17.07.2018 |
| Datum proběhlé obhajoby: | 13.09.2018 |
| Oponenti: | Mgr. Ondřej Kopáček, Ph.D. |
| Zásady pro vypracování |
| The goal of the project is to investigate mass loss from binary stars and their observable signatures. In particular, the loss of mass and angular momentum from the vicinity of the outer Lagrange point (L2) can significantly affect the evolution of the binary star and its orbit. The thermal content of gas leaving L2 is typically much smaller than the orbital velocity, which permits to use ballistic approximation. So far, the L2 mass loss was investigated under the assumption of corotation, which might be violated in later stages of interaction. The goal of the thesis is to investigate trajectories of test particles around binary stars under general initial conditions, determine their final states, and estimate conditions for particle collisions (ie. hydrodynamic shocks). |
| Seznam odborné literatury |
| Eggleton, P., 2006, Evolutionary Processes in Binary and Multiple Stars, ISBN 0521855578. Cambridge, UK: Cambridge University Press
Shu, F., Anderson, L., Lubow, S., 1979, On the structure of contact binaries. III - Mass and energy flow, Astrophysical Journal, Part 1, vol. 229, p. 223-241 Sepinsky, J., Willems, B., Kalogera, V., 2007, Equipotential Surfaces and Lagrangian Points in Nonsynchronous, Eccentric Binary and Planetary Systems, The Astrophysical Journal, Volume 660, Issue 2, pp. 1624-1635 Pejcha, O., Metzger, B., Tomida, K., Cool and luminous transients from mass-losing binary stars, Monthly Notices of the Royal Astronomical Society, Volume 455, Issue 4, p.4351-4372 |
| Předběžná náplň práce v anglickém jazyce |
| Many binary stars can experience catastrophic interaction accompanied by almost instantaneous loss of mass, angular momentum, and energy. This "common envelope" interaction is critical for many pathways of binary evolution leading to tight binaries composed of white dwarfs, neutron stars, and black holes, including the progenitors of gravitational wave sources. Recently, these events were identified in time-domain surveys of the sky, which brings an unique opportunity to understand this phase by direct modeling of observations of the associated transient brightenings. Recent work on these transients shows that mass loss occurs most likely from the vicinity of the outer Lagrange point (L2) and lasts many orbits. However, the dynamics of gas leaving the binary star has not been fully explored in the setting relevant for the observed events. |