Accretion discs, Astrophysical dynamos, Planetary formation, Exoplanet systems, Solar and stellar phenomena and non equilibrium physical processes
Lead Research Organisation:
University of Cambridge
Department Name: Applied Maths and Theoretical Physics
Abstract
This is a proposal to investigate a number of phenomena: The first is astrophysical discs. These objects are common, being found in close binary systems, active galactic nuclei, and around newly formed stars. There they provide the environment for planet formation. We propose in depth studies of these objects to establish the physical conditions that apply, for instance the degree of turbulence, the magnetic field strength, the amount of anomalous transport and whether the discs remain circular. We then intend to investigate the effects of this environment on forming planets and their orbital migration. If inward, this natuarlly leads on to a consideration of tidal interaction with the central star which may cause heating and inflation, which appears to be common, or even coallescence with the central star. Such a study requires a fully nonlinear tidal theory for general orbits that we intend to develop. The second investigation relates to solar type stars which many extrasolar planets orbit. It accordingly connects with the investigation of tidal interaction. This investigation is directed towards understanding the behaviour of the solar dynamo and how magnetic flux emerges at the surface. This can be determined from Hinode obsrvations of active regions. Both analytic and numerical studies of dynamo processes will be undertaken together with improved modeling of the solar tachocline which may play an important role in generating toroidal field that rises buoyantly to the surface.
Publications
Garaud P
(2010)
A model of the entropy flux and Reynolds stress in turbulent convection Turbulent convection
in Monthly Notices of the Royal Astronomical Society
Rempel E
(2009)
A novel type of intermittency in a non-linear dynamo in a compressible flow
in Monthly Notices of the Royal Astronomical Society
Courvoisier A
(2010)
A self-consistent treatment of the electromotive force in magnetohydrodynamics for large diffusivities
in Astronomische Nachrichten
Del Zanna G
(2011)
A single picture for solar coronal outflows and radio noise storms
in Astronomy & Astrophysics
Heinemann T
(2012)
A weakly non-linear theory for spiral density waves excited by accretion disc turbulence Weakly non-linear spiral density waves
in Monthly Notices of the Royal Astronomical Society
Tripathi D
(2009)
ACTIVE REGION LOOPS: HINODE /EXTREME-ULTRAVIOLET IMAGING SPECTROMETER OBSERVATIONS
in The Astrophysical Journal
Tripathi D
(2010)
Active region moss Basic physical parameters and their temporal variation
in Astronomy and Astrophysics
Del Zanna G
(2010)
Atomic data from the IRON project LXVIII. Electron impact excitation of Fe xi
in Astronomy and Astrophysics
Del Zanna G
(2009)
Benchmarking atomic data for astrophysics: Fe VII and other cool lines observed by Hinode EIS
in Astronomy & Astrophysics
Del Zanna G
(2009)
Benchmarking atomic data for astrophysics: Fe VIII EUV lines
in Astronomy & Astrophysics
Del Zanna G
(2009)
Benchmarking atomic data for astrophysics: Fe XVII EUV lines
in Astronomy & Astrophysics
Jouve L
(2010)
Buoyancy-induced time delays in Babcock-Leighton flux-transport dynamo models
in Astronomy and Astrophysics
Ivanov P
(2011)
Close encounters of a rotating star with planets in parabolic orbits of varying inclination and the formation of hot Jupiters
in Celestial Mechanics and Dynamical Astronomy
Mann P
(2009)
Competing local and non-local a-effects for a simplified flux transport dynamo model
in Monthly Notices of the Royal Astronomical Society: Letters
Balbus S
(2009)
Differential rotation and convection in the Sun
in Monthly Notices of the Royal Astronomical Society
Balbus S
(2010)
Differential rotation in fully convective stars
in Monthly Notices of the Royal Astronomical Society
Gu P
(2009)
Diurnal thermal tides in a non-synchronized hot Jupiter
in Monthly Notices of the Royal Astronomical Society
Silvers L
(2009)
DOUBLE-DIFFUSIVE INSTABILITIES OF A SHEAR-GENERATED MAGNETIC LAYER
in The Astrophysical Journal
Papaloizou J
(2010)
Dynamic tides in rotating objects: a numerical investigation of inertial waves in fully convective or barotropic stars and planets Dynamic tides in rotating objects
in Monthly Notices of the Royal Astronomical Society
Lin M
(2011)
Edge modes in self-gravitating disc-planet interactions Edge modes
in Monthly Notices of the Royal Astronomical Society
Richardson K
(2010)
Effects of a-effect fluctuations on simple nonlinear dynamo models
in Geophysical & Astrophysical Fluid Dynamics
Proctor M
(2010)
Effects of boundary conditions on the onset of convection with tilted magnetic field and rotation vectors
in Geophysical & Astrophysical Fluid Dynamics
Sterling A
(2010)
Evidence for magnetic flux cancelation leading to an ejective solar eruption observed by Hinode , TRACE , STEREO , and SoHO /MDI
in Astronomy and Astrophysics
O'Dwyer B
(2010)
Hinode extreme-ultraviolet imaging spectrometer observations of a limb active region
in Astronomy & Astrophysics
Alexander C
(2011)
Hinode observations and 3D magnetic structure of an X-ray bright point
in Astronomy & Astrophysics
Latter H
(2010)
Hydrodynamical simulations of viscous overstability in Saturn's rings
in Icarus
Latter H
(2012)
Hysteresis and thermal limit cycles in MRI simulations of accretion discs Hysteresis in MRI simulations
in Monthly Notices of the Royal Astronomical Society
Ivanov P
(2010)
Inertial waves in rotating bodies: a WKBJ formalism for inertial modes and a comparison with numerical results Inertial waves in rotating bodies
in Monthly Notices of the Royal Astronomical Society
Silvers L
(2009)
Interactions between magnetohydrodynamic shear instabilities and convective flows in the solar interior
in Monthly Notices of the Royal Astronomical Society
Tripathi D
(2009)
Large Amplitude Oscillations in Prominences
in Space Science Reviews
Schmit D
(2009)
LARGE-SCALE FLOWS IN PROMINENCE CAVITIES
in The Astrophysical Journal
Rein H
(2013)
Large-scale N-body simulations of the viscous overstability in Saturn's rings
in Monthly Notices of the Royal Astronomical Society
Fromang S
(2013)
Local outflows from turbulent accretion disks
in Astronomy & Astrophysics
Crida A
(2010)
MIGRATION OF A MOONLET IN A RING OF SOLID PARTICLES: THEORY AND APPLICATION TO SATURN'S PROPELLERS
in The Astronomical Journal
Bemporad A.
(2009)
Multispacecraft observations of a prominence eruption
in ANNALES GEOPHYSICAE
Paardekooper S
(2009)
On corotation torques, horseshoe drag and the possibility of sustained stalled or outward protoplanetary migration
in Monthly Notices of the Royal Astronomical Society
Barker A
(2010)
On internal wave breaking and tidal dissipation near the centre of a solar-type star
in Monthly Notices of the Royal Astronomical Society
Lesur G
(2010)
On the angular momentum transport due to vertical convection in accretion discs
in Monthly Notices of the Royal Astronomical Society: Letters
Papaloizou J
(2010)
On the dynamics of multiple systems of hot super-Earths and Neptunes: tidal circularization, resonance and the HD 40307 system
in Monthly Notices of the Royal Astronomical Society
Rein H
(2009)
On the evolution of mean motion resonances through stochastic forcing: fast and slow libration modes and the origin of HD 128311
in Astronomy & Astrophysics
Lesur G
(2009)
On the stability of elliptical vortices in accretion discs
in Astronomy & Astrophysics
Barker A
(2009)
On the tidal evolution of Hot Jupiters on inclined orbits
in Monthly Notices of the Royal Astronomical Society
Paardekooper S. -J.
(2009)
On the width and shape of the corotation region for low-mass planets
in MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Podlewska-Gaca E
(2012)
Outward migration of a super-Earth in a disc with outward propagating density waves excited by a giant planet A super-Earth in a disc with density waves
in Monthly Notices of the Royal Astronomical Society
Tripathi D
(2009)
Partially-erupting prominences: a comparison between observations and model-predicted observables
in Astronomy & Astrophysics
WOOD T
(2011)
Polar confinement of the Sun's interior magnetic field by laminar magnetostrophic flow
in Journal of Fluid Mechanics
Liang G
(2009)
R-matrix calculations for electron impact excitation
in Journal of Physics: Conference Series
Description | Quota Studentships |
Amount | £520,730 (GBP) |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 10/2008 |
End | 09/2013 |
Description | Royal Society International Joint Project with Japan |
Amount | £12,000 (GBP) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 01/2010 |
End | 12/2011 |
Description | UK APAP Network |
Amount | £316,993 (GBP) |
Funding ID | PP/E001254/1 |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 02/2008 |
End | 02/2011 |
Description | Royal Society International Joint Project with Japan |
Organisation | National Astronomical Observatory of Japan |
Country | Japan |
Sector | Academic/University |
PI Contribution | Theoretical input on the theory of planet formation and planetary rings |
Collaborator Contribution | Provision of expertise related to N body codes applied to simulations of planet fromation and planetary rings |
Impact | The development of N body codes for simulating particles in the Uranus ring system |
Start Year | 2010 |
Description | STFC-funded UK APAP Network Ref: PP/E001254/1 |
Organisation | University College London |
Department | Department of Physics & Astronomy |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | The group has done atomic physics calculations, have benchmarked them against experimental data, and used them for the analysis of spectra from stellar coronae. They have also distributed the atomic data within CHIANTI and VAMDC (an EU FP7 network). |
Collaborator Contribution | UCL provides a world-wide leader in atomic physics who has collaborated with the group on calculating atomic data for a large number of ions important for astrophysics. |
Impact | In the Jan 2006 - Dec 2010 timeframe the APAP team published 101 refereed papers. They are all highest-quality papers, describing atomic data which are used world-wide by almost all atomic databases and modelling codes, and are directly or indirectly cited by hundreds of refereed papers per year. |
Start Year | 2008 |
Description | STFC-funded UK APAP Network Ref: PP/E001254/1 |
Organisation | University of Strathclyde |
Department | Department of Physics |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | The group has done atomic physics calculations, have benchmarked them against experimental data, and used them for the analysis of spectra from stellar coronae. They have also distributed the atomic data within CHIANTI and VAMDC (an EU FP7 network). |
Collaborator Contribution | UCL provides a world-wide leader in atomic physics who has collaborated with the group on calculating atomic data for a large number of ions important for astrophysics. |
Impact | In the Jan 2006 - Dec 2010 timeframe the APAP team published 101 refereed papers. They are all highest-quality papers, describing atomic data which are used world-wide by almost all atomic databases and modelling codes, and are directly or indirectly cited by hundreds of refereed papers per year. |
Start Year | 2008 |
Description | DAMTP open days |
Form Of Engagement Activity | Participation in an open day or visit at my research institution |
Part Of Official Scheme? | No |
Primary Audience | Public/other audiences |
Results and Impact | Many members of the public attended the demonstartions of our research activities given by staff members and research students. There was much inrterest and discusion from hundreds of young people during these open days. Participants report great success at communicating leading edhe research. |
Year(s) Of Engagement Activity | 2006,2007,2008,2009,2010 |
Description | Suntrek |
Form Of Engagement Activity | A press release, press conference or response to a media enquiry/interview |
Part Of Official Scheme? | Yes |
Primary Audience | Schools |
Results and Impact | Suntrek is an educational website aimed at 11-16 year olds and their teachers. It describes the astronomy and science of the Sun and its effect on the Earth's environment. The Sun|trek website was launched in July 2007. Since then the number of users has risen to 20,000 per month, which far exceeds our expectations. Sun|trek is now being used by schools throughout the UK, and much further afield. Sun|trek resources have been sent to many schools, including inner city schools (for example in Southall, London and the Ishango Science Club, Birmingham). The Birmingham local news report says: 'The Ishango Science Club after-school Sun-Trek mission held 10 sessions inspired by the Cambridge outreach materials supplied. This organisation specifically targets and inspires bright young ethnic minority children.' Fliers, posters, pens and other Suntrek material have been distributed throughout the UK and internationally (to S. America, rural India and S. Africa). Classroom projects and ideas are provided on the website. Sun|trek is now linked to many other educational websites, eg STEM directories, RAS, STFC, ASE, IoP, NASA, Cambridge University activities, IYA, IHY, Hinode and SoHO websites, Schoolscience and the BBC. |
Year(s) Of Engagement Activity | 2010,2011 |