In this paper, we make a detailed study of the spin–orbit dynamics of Mercury, as predicted by the realistic model that has been recently introduced in a series of papers mainly by Efroimsky and Makarov. We present numerical and analytical results concerning the nature of the librations of Mercury's spin in the 3:2 resonance. The results provide evidence that the librations are quasi-periodic in time, consisting of a slow oscillation, with an amplitude of order of arcminutes, superimposed on the 88-d libration. This contrasts with recent astronomical observations and hence suggests that the 3:2 resonance in which Mercury has been trapped might have been originally described by a large-amplitude quasi-periodic libration that, only at a later stage, with the formation of a molten core, evolved into the small-amplitude libration that is observed today.

Bartuccelli, M., Deane, J., Gentile, G. (2017). Periodic and quasi-periodic attractors for the spin–orbit evolution of Mercury with a realistic tidal torque. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 469(1), 127-150 [10.1093/mnras/stx809].

Periodic and quasi-periodic attractors for the spin–orbit evolution of Mercury with a realistic tidal torque

Gentile, Guido
2017-01-01

Abstract

In this paper, we make a detailed study of the spin–orbit dynamics of Mercury, as predicted by the realistic model that has been recently introduced in a series of papers mainly by Efroimsky and Makarov. We present numerical and analytical results concerning the nature of the librations of Mercury's spin in the 3:2 resonance. The results provide evidence that the librations are quasi-periodic in time, consisting of a slow oscillation, with an amplitude of order of arcminutes, superimposed on the 88-d libration. This contrasts with recent astronomical observations and hence suggests that the 3:2 resonance in which Mercury has been trapped might have been originally described by a large-amplitude quasi-periodic libration that, only at a later stage, with the formation of a molten core, evolved into the small-amplitude libration that is observed today.
Bartuccelli, M., Deane, J., Gentile, G. (2017). Periodic and quasi-periodic attractors for the spin–orbit evolution of Mercury with a realistic tidal torque. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 469(1), 127-150 [10.1093/mnras/stx809].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/327641
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 5
social impact