Radial drift and concurrent ablation of boulder-sized objects

Burn, Remo; Marboeuf, Ulysse; Alibert, Yann; Benz, Willy (2019). Radial drift and concurrent ablation of boulder-sized objects. Astronomy and astrophysics, 629, A64. EDP Sciences 10.1051/0004-6361/201935780

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Context. The composition of a protoplanetary disk at a given location does not only depend on temperature and pressure but also on the time dependent transport of matter, such as radial drift of solid bodies, which could release water and other volatile species before disintegration or accretion onto a larger body with potentially considerable implications for the composition of planets. Aims. We performed a parameter study focused on the water depletion of different sized bodies able to cross the water snowline by gas-induced radial drift. Methods. Either the analytical Hertz–Knudsen–Langmuir sublimation formula assuming equilibrium temperature within the body or a more involved, numerical model for the internal thermal evolution was coupled with an α-disk model. Different properties of the disk and the embedded body were explored. Results. Bodies with radii up to 100 m drift faster toward the central star than the water snowline, and can therefore cross it. The region that can be reached before complete disintegration – and is therefore polluted with H₂O ice – extends to 10% closer to the star than the snowline location. The extent of this polluted region could be multiple times larger in the presence of a dust mantle, which is, however, unlikely to form due to frequent collisions with objects smaller than a centimeter. Conclusions. Given a significant abundance of meter-sized boulders in protoplanetary disks, the transport of water by radial drift of these bodies toward regions closer to the star than the snowline is not negligible and this flux of volatiles can be estimated for a given distribution of solid body sizes and compositions. A simple expression for surface sublimation is applicable for a homogeneous body consisting of only dust and water ice without a dust mantle.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Burn, Remo; Marboeuf, Ulysse; Alibert, Yann and Benz, Willy

Subjects:

500 Science > 530 Physics
500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Remo Burn

Date Deposited:

04 Feb 2020 15:14

Last Modified:

04 Feb 2020 15:24

Publisher DOI:

10.1051/0004-6361/201935780

ArXiv ID:

1908.02513v1

BORIS DOI:

10.7892/boris.139688

URI:

https://boris.unibe.ch/id/eprint/139688

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