Secondary gas in debris discs released following the decay of long-lived radioactive nuclides, catastrophic, or resurfacing collisions

Author:

Bonsor Amy1ORCID,Wyatt Mark C1ORCID,Marino Sebastian2ORCID,Davidsson Björn J R3ORCID,Kral Quentin4ORCID,Thebault Philippe4

Affiliation:

1. Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA , UK

2. Department of Physics and Astronomy, University of Exeter , Stocker Road, Exeter EX4 4QL , UK

3. Jet Propulsion Laboratory, California Institute of Technology , M/S 183-601, 4800 Oak Grove Drive, Pasadena, CA 91109 , USA

4. LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université , Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon , France

Abstract

ABSTRACT Kuiper-like belts of planetesimals orbiting stars other than the Sun are most commonly detected from the thermal emission of small dust produced in collisions. Emission from gas, most notably CO, highlights the cometary nature of these planetesimals. Here, we present models for the release of gas from comet-like bodies in these belts, both due to their thermophysical evolution, most notably the decay of long-lived radioactive nuclides, and collisional evolution, including catastrophic and gentler resurfacing collisions. We show that the rate of gas release is not proportional to the rate of dust release, if non-catastrophic collisions or thermal evolution dominate the release of CO gas. In this case, care must be taken when inferring the composition of comets. Non-catastrophic collisions dominate the gas production at earlier times than catastrophic collisions, depending on the properties of the planetesimal belt. We highlight the importance of the thermal evolution of comets, including crucially the decay of long-lived radioactive nuclides, as a source of CO gas around young (<50 Myr) planetary systems, if large (10–100 km) planetesimals are present.

Funder

Royal Society

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Dynamics of cold circumstellar gas in debris discs;Monthly Notices of the Royal Astronomical Society;2024-04-13

2. Devolatilization of extrasolar planetesimals by 60Fe and 26Al heating;Monthly Notices of the Royal Astronomical Society;2024-02-14

3. The debris disc of HD 131488: bringing together thermal emission and scattered light;Monthly Notices of the Royal Astronomical Society;2023-11-08

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