Our Galaxy hosts a very massive object at its centre, often referred to as the supermassive black hole Sgr A*. Its gravitational tidal field is so intense that it can strip apart a binary star passing its vicinity and accelerate one of the components of the binary as hypervelocity star (HVS) and grab the other star as S-star. Taking into consideration that many binary star systems are known to host planets, in this paper we aim to broaden the study of the close interaction of binary stars and their planetary systems with Sgr A* massive object. Results are obtained via a high-precision N-body code including post-Newtonian approximation. We quantify the likelihood of capture and ejection of stars and planets after interaction with Sgr A*, finding that the fraction of stars captured around it is about three times that of the planets (∼49.4 per cent versus ∼14.5 per cent) and the fraction of hypervelocity planet ejection is about twice that of HVSs (∼21.7 per cent versus ∼9.0 per cent). The actual possibility of observational counterparts deserves further investigation.

The fate of binary stars hosting planets upon interaction with Sgr A* black hole / Capuzzo-Dolcetta, R; Davari, N. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 496:2(2020), pp. 1545-1553. [10.1093/mnras/staa1561]

The fate of binary stars hosting planets upon interaction with Sgr A* black hole

R Capuzzo-Dolcetta
Primo
Supervision
;
N Davari
Secondo
Software
2020

Abstract

Our Galaxy hosts a very massive object at its centre, often referred to as the supermassive black hole Sgr A*. Its gravitational tidal field is so intense that it can strip apart a binary star passing its vicinity and accelerate one of the components of the binary as hypervelocity star (HVS) and grab the other star as S-star. Taking into consideration that many binary star systems are known to host planets, in this paper we aim to broaden the study of the close interaction of binary stars and their planetary systems with Sgr A* massive object. Results are obtained via a high-precision N-body code including post-Newtonian approximation. We quantify the likelihood of capture and ejection of stars and planets after interaction with Sgr A*, finding that the fraction of stars captured around it is about three times that of the planets (∼49.4 per cent versus ∼14.5 per cent) and the fraction of hypervelocity planet ejection is about twice that of HVSs (∼21.7 per cent versus ∼9.0 per cent). The actual possibility of observational counterparts deserves further investigation.
2020
binaries: general; planetary systems; methods: numerical; Galaxy: centre; Astrophysics - Astrophysics of Galaxies
01 Pubblicazione su rivista::01a Articolo in rivista
The fate of binary stars hosting planets upon interaction with Sgr A* black hole / Capuzzo-Dolcetta, R; Davari, N. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 496:2(2020), pp. 1545-1553. [10.1093/mnras/staa1561]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1435056
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