# Dynamics of Discs and Planets

Created: | 2009-10-02 14:28 |
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Institution: | Isaac Newton Institute for Mathematical Sciences |

Description: | Ever since the discovery in 1995 of an object with half the mass of Jupiter in a four-day orbit around the star 51 Pegasi, it has been clear that the dynamics of extrasolar planetary systems can be quite different from that of our solar system. More than 200 extrasolar planets have now been found, including at least 20 systems with multiple planets, some in resonant configurations. Their diversity must originate in the properties of the protoplanetary disc of dusty gas out of which they form, the dynamics of the formation of the planetary core, and the subsequent interaction of the planet with the surrounding disc, with other planets, and with the central star.
Over the past decade, there has been significant progress on the theoretical aspects of the planet formation process. Two viable models of planet formation have been explored, core accretion (growth of dust into planets through mutual collisions) and gravitational instability in the disc, and several modes of angular momentum exchange between planet and disc have been identified which may explain the proximity of the 51 Peg planet to its star. However, many of the stages of planet formation remain poorly understood. In part this is because of a lack of knowledge of the physical nature of protoplanetary discs, although this has increased dramatically in recent years owing both to observations of the gaseous and dusty components of the discs of pre-main-sequence stars and to computational modelling of their (magneto-) hydrodynamics. The outcome of planet formation is also becoming more tightly constrained, through the growing number of systems known to have either extrasolar planets or planetesimal belts analogous to the asteroid and Kuiper belts. The discovery of planetesimals and dwarf planets in the Kuiper belt beyond Neptune is also leading to a revision in our understanding of the formation and evolution of the outer solar system. The wide array of phenomena seen in all systems is opening up new areas of celestial mechanics. Read more at: http://www.newton.ac.uk/programmes/DDP/ |

# Media items

This collection contains 27 media items.

### Media items

#### Asteroids formed big

Morbidelli, A (Observatoire de Nice)

Tuesday 29 September 2009, 11:30-12:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Chaotic star formation and the alignment of stellar rotation with disc and planetary orbital axes

Bate, M (Exeter)

Tuesday 03 November 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Wed 11 Nov 2009

#### Determining the internal structure of extrasolar planets, and the phenomenon of retrograde planetary orbits

Mardling, R (Monash)

Thursday 26 November 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Tue 1 Dec 2009

#### Do we need a rapid dispersal mechanism for protoplanetary discs?

Clarke, C, Ercolano, B, Owen, J (Cambridge)

Tuesday 24 November 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Thu 26 Nov 2009

#### Dust, vortices and density waves in protoplanetary disks

Papaloizou, J (Cambridge)

Monday 28 September 2009, 10:00-11:00

Planetesimal Formation

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Formation of close-in terrestrial planets: inner disk boundary, disk-planet interactions and giant impacts

Ida, S (Tokyo Institute of Technology)

Friday 23 October 2009, 14:30-16:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Wed 11 Nov 2009

#### Formation, survival, and destruction of vortices in accretion disks

Lithwick, Y (CITA)

Thursday 17 September 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Forming planetesimals in solar and extrasolar nebulae

Youdin, A (Toronto)

Wednesday 09 September 2009, 14:30-16:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Garvoturbulent planetesimal formation - state and prospects of the field

Klahr, H (MPI for Astronomy)

Wednesday 30 September 2009, 15:30-16:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### How reliable are MRI simulations? The role of the magnetic Prandtl number

Fromang, S (CEA/Saclay)

Wednesday 30 September 2009, 09:30-10:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Magnetic activity and the separation of dust from gas

Turner, NJ (Caltech)

Wednesday 30 September 2009, 11:30-12:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Magnetic activity in protoplanetary discs

Wardle, MJ (Macquarie)

Wednesday 30 September 2009, 09:00-09:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Models of partially ionized discs

Terquem, C (Pierre & Marie Curie-Paris VI)

Monday 28 September 2009, 15:30-16:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Observation and modeling of proto-planetary disks

Dullemond, C (MPI for Astronomy)

Monday 28 September 2009, 11:30-12:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### On the validity of the super-particle approximation of planetesimals in simulations of gravitational collapse

Rein, H (Cambridge)

Tuesday 29 September 2009, 12:00-12:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Open problems in terrestrial planet formation

Raymond, S (Colorado)

Thursday 10 December 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Mon 14 Dec 2009

#### Planetesimal formation in self-gravitating protostellar discs

Lodato, G (Milan)

Tuesday 29 September 2009, 16:00-17:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Planetesimal formation: numerical modeling of particle growth, settling, and collective gas-grain interactions

Weidenschilling, S (Planetary Science Institute)

Tuesday 29 September 2009, 09:00-10:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009

#### Planets in binaries

Haghighipour, N (Hawaii)

Thursday 29 October 2009, 14:30-15:30

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Wed 11 Nov 2009

#### Prandtl number dependence of MRI-driven transport : new results and future prospects

Longaretti, PY (Joseph Fourier Grenoble)

Wednesday 30 September 2009, 10:30-11:00

**Collection**:
Dynamics of Discs and Planets

**Institution**:
Isaac Newton Institute for Mathematical Sciences

**Created**:
Fri 9 Oct 2009