The impact of tidal disruption events on galactic habitability. Issue 3 (21st August 2020)

• Record Type: Journal Article
• Authors: Pacetti, E; Balbi, A; Lingam, M; Tombesi, F; Perlman, E
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 498:Issue 3(2020)
• Page Start: 3153
• Page End: 3157
• Publication Date: 2020-08-21
• Subjects: astrobiology -- planets and satellites: atmospheres -- planets and satellites: terrestrial planets -- Galaxy: nucleus -- quasars: supermassive black holes -- transients: tidal disruption events; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa2535
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: Tidal disruption events (TDEs) are characterized by the emission of a short burst of high-energy radiation. We analyse the cumulative impact of TDEs on galactic habitability using the Milky Way as a proxy. We show that X-rays and extreme ultraviolet radiation emitted during TDEs can cause hydrodynamic escape and instigate biological damage. By taking the appropriate variables into consideration, such as the efficiency of atmospheric escape and distance from the Galactic centre, we demonstrate that the impact of TDEs on galactic habitability is comparable to that of active galactic nuclei. In particular, we show that planets within distances of ∼0.1–1 kpc could lose Earth-like atmospheres over the age of the Earth, and that some of them might be subject to biological damage once every ≳ 10 4 yr. We conclude by highlighting potential ramifications of TDEs and argue that they should be factored into future analyses of inner galactic habitability.