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Black holes, planets and dynamic accretion discs in astrophysics


Project Description

Accretion discs are central to much of astronomy: they are the birth sites of stars and planets, and they surround supermassive black holes in active galaxies and quasars. These discs form when gas moves on orbits in the gravity field of a star or black hole, balancing the central gravitational pull with the centrifugal effect of rotation. Angular momentum is transported outwards by a viscosity, allowing most of the gas to spirals inwards. This process turns gravitational potential energy into light, and is the most efficient way of extracting energy from ordinary matter. In some systems this can be observed across much of the entire visible Universe.

Supermassive black hole accretion can outshine galaxies and significantly affect the hole’s surroundings through energy and momentum feedback. When we observe these systems they always show complex time variability, and our theoretical models are now starting to produce plausible mechanisms to explain these phenomena.

We will use state-of-the-art computational fluid dynamic modelling on high performance computing facilities (HPC) to create sophisticated models of astrophysical fluid flows. Motivated by observations, we will target these simulations at explaining unsolved problems in astrophysics. As the project develops we can connect these simulations with observed data sets, or focus on code development to enable and perform simulations with unprecedented detail and new physics. There are a wide range of possible applications that could be investigated, for example the interaction of dust and gas in planet-forming discs with the aim of learning more about how worlds are constructed in nature, or simulating chaotic gas flows around supermassive black holes in galaxy centres to understand the processes which shape galaxies in our Universe.

Funding Notes

This project is eligible for a fully funded STFC studentship which includes :
· A full UK/EU fee waiver for 3.5 years
· An annual tax free stipend of £14,777 (2018/19)
· Research Training Support Grant (RTSG)
· Conference Fees & UK Fieldwork

Studentships are available to UK/EU applicants who meet the STFC Residency Criteria; if you have been ordinarily resident in the UK for three years you will normally be entitled to apply for a full studentship.

References

The Maximum Mass Solar Nebula and the early formation of planets
Nixon, King & Pringle 2018, MNRAS, 477, 3273
http://adsabs.harvard.edu/abs/2018MNRAS.477.3273N

Tidal disruption events from supermassive black hole binaries
Coughlin, Armitage, Nixon, Begelman 2017, MNRAS, 459, 3089
http://adsabs.harvard.edu/abs/2017MNRAS.465.3840C

Tearing up the disc: misaligned accretion on to a binary
Nixon, King & Price 2013, MNRAS, 434, 1946
http://adsabs.harvard.edu/abs/2013MNRAS.434.1946N

Related Subjects

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