EXTREME ASTROPHYSICS · Ultra-compact binaries and gamma-ray bursts
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2011-01-01 → 2012-12-31
- Финансиране от ЕС
- 164 629 €
- Участници
- 1
- Схема
- MC-IEF
Линиите свързват координатора с партньорите.
Накратко на български
Гамма-вспышките, причинени от срутване на масивни звезди в черни дупки, се анализират чрез влиянието на двойните звездни системи. Това помага да се разбере как ядрото на звездата запазва бързото си въртене до края на живота си.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Extreme Astrophysics: Ultra-compact binaries and gamma-ray bursts
Long-duration gamma-ray bursts are the most energetic explosions in the Universe. They occur during the formation of a black hole from the collapsing core of a rapidly-rotating massive star. The outer parts of the core are ejected in the supernova explosion that forms the black hole and fall back to form a disc of material that orbits the newly-formed back hole. Accretion of this disc onto the black hole produces jets; if these jets point towards us we see the gamma-rays that form the gamma-ray burst. Although the existance of gamma-ray bursts has been known since early space experiments in the 1960s, the real scientific breakthroughs in our understanding have come in the last 15 years. Some key theoretical problems remain, however, in understanding these events. The central problem is how to keep the stellar core spinning rapidly enough to the end of the massive star’s life. We have shown that a natural way to keep the core spinning is for it to be in a binary system of two massive stars orbiting one another, and that this forms a natural explanation for some of the observed features of long-duration gamma-ray bursts.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
We propose a research project to work within the field of extreme astrophysics, on ultra-compact binaries and gamma-ray bursts. In particular we wish to understand the role of compact binaries as gamma-ray burst (GRB) progenitors, the formation of compact binaries in the field of our Galaxy and the production of interacting binaries in globular clusters. We will approach these connected problems in four different ways. First, we will predict the galactic offsets of short GRBs, using our detailed binary stellar evolution code to compute the evolution of the binaries most important for their production. Some events in compact binary evolution that proceed on hydrodynamical timescales will be modelled using smoothed particle hydrodynamics (SPH). We shall further use the predictions to model the wind outflows from the binary and single-star progenitors of long gamma-ray bursts to determine if the two can be distinguished. Secondly, we shall use a detailed stellar evolution code to compute the evolution of ultra-compact binaries in the field, to better understand the origins of some of their observed properties. Thirdly, we shall use a code that combines detailed stellar evolution and N-body dynamics to model the evolution of the progenitor binaries of gamma-ray bursts in dense stellar environments. Finally, we shall estimate the production rate of LISA-visible binaries in the field and in globular clusters from the models mentioned above. To achieve this scientific programme we intend to recruit Ross Church as a fellow. Church is an expert in stellar evolution and N-body dynamics, and his computer code that combines the two is a unique research tool for the investigation of stellar evolution in dense stellar systems such as the core of a globular cluster. His recruitment will broaden his scientific skill base and research interests and allow him to mature as a researcher, thus fulfilling the aims of the FP7 people" work programme."
Оригинален текст от CORDIS (на английски).
Участници
- MAX IV Laboratory, Lund University · LUNDКоординаторШвеция
Връзки
Данни: CORDIS, © Европейски съюз