Disruption of a Proto-Planetary Disk by the Black Hole at the Milky Way Centre

Details Disruption of a Proto-Planetary Disk by the Black Hole at the Milky Way Centre Disruption of a Proto-Planetary Disk by the Black Hole at the Milky Way Centre

2011-12-20

arxiv.org/abs/1112.4822v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Press embargo until published

Scientific paper

Recently, Gillessen et al. discovered an ionized cloud of gas plunging toward the supermassive black hole, SgrA*, at the centre of the Milky Way. The cloud is being tidally disrupted along its path to closest approach at ~3100 Schwarzschild radii from the black hole. Here, we show that this cloud of gas naturally originates from a proto-planetary disk surrounding a low-mass star, which was scattered a century ago from the observed ring of young stars orbiting Sgr A*. As the young star approaches the black hole, its disk experiences both photo-evaporation and tidal disruption, producing a cloud with the observed properties. Our model implies that planets form in the Galactic centre, and that tidal debris from proto-planetary disks can flag low mass stars which are otherwise too faint to be detected.

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