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Stampa

SEMINARI DI ANALISI MATEMATICA

Evento 

Titolo:
Dynamics of long-period comets and the memory of the Oort cloud
Quando:
22.02.2019 11.30 h
Dove:
Palazzo Campana - Torino
Aula:
Sala S
Relatore:
Prof. Marc Fouchard
Afferenza:
Université des Sciences et Technologies de Lille
Proponente:
S. Terracini
Locandina:
Locandina

Descrizione

The physical life of a comet near the Sun is relatively short. Therefore, in order to provide the actual flow of comets, there should be cometary reservoirs in the solar system where comets do not feel the heat of the Sun. For long period comets, i.e. comets with an orbital period greater than 200 years, this reservoir is believed to be at more than 10,000 times the Earth-Sun distance, known as the Oort Cloud. However, the shape, density and formation of this Oort cloud remains an open question.

The problem is that cometary dynamics is highly chaotic, so it is useless to investigate the origin of comets by  backward propagation of their movement. We are therefore reduced to massive simulations  where huge samples of synthetic comets are propagated forward over a long time span. The Oort cloud informations are then obtained by comparing the final results with the observations.

I will first introduce how we have built our model for the long-term propagation of long-lived comets. This model takes into account the gravitational attraction of the whole galaxy on the Sun and the comets, which induces an quasi-integrable dynamic, the passage of the stars close to the Sun and the planetary scattering by the four giant planets of our solar system. These last two effects are stochastic.

Then, I will present how this model has allowed us to investigate the memory of the Oort cloud and should give us crucial informations about its formation.

Sede

Mappa
Sede:
Palazzo Campana   -   Sito web
Via:
Via Carlo Alberto, 10
Cap:
10123
Città:
Torino
Provincia:
To
Paese:
Paese: it

Descrizione

Dipartimento di Matematica, Università degli Studi di Torino

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