@article{a6851377352a40929b73b18651737711,
title = "Inner mean-motion resonances with eccentric planets: A possible origin for exozodiacal dust clouds",
abstract = "High levels of dust have been detected in the immediate vicinity of many stars, both young and old. A promising scenario to explain the presence of this short-lived dust is that these analogues to the zodiacal cloud (or exozodis) are refilled in situ through cometary activity and sublimation. As the reservoir of comets is not expected to be replenished, the presence of these exozodis in old systems has yet to be adequately explained. It was recently suggested that mean-motion resonances with exterior planets on moderately eccentric (ep ≿ 0.1) orbits could scatter planetesimals on to cometary orbits with delays of the order of several 100 Myr. Theoretically, this mechanism is also expected to sustain continuous production of active comets once it has started, potentially over Gyr time-scales. We aim here to investigate the ability of this mechanism to generate scattering on to cometary orbits compatible with the production of an exozodi on long time-scales. We combine analytical predictions and complementary numerical N-body simulations to study its characteristics. We show, using order of magnitude estimates, that via this mechanism, low-mass discs comparable to the Kuiper belt could sustain comet scattering at rates compatible with the presence of the exozodis which are detected around Solar-type stars, and on Gyr time-scales. We also find that the levels of dust detected around Vega could be sustained via our proposed mechanism if an eccentric Jupiter-like planet were present exterior to the system's cold debris disc.",
keywords = "Celestial mechanics, Circumstellar matter, Comets: general, Methods: numerical, Planetary systems, Zodiacal dust",
author = "V. Faramaz and S. Ertel and M. Booth and J. Cuadra and C. Simmonds",
note = "Funding Information: The authors wish to thank the anonymous referee for helping us clarify this paper. VF and MB acknowledge support from Fondo Nacional de Desarrollo Cient{\'i}fico y Tecnol{\'o}gico (FONDECYT) Postdoctoral Fellowships, projects nos. 3150106 and 3140479. VF, MB, and JC acknowledge support from the Millennium Nucleus RC130007 (Chilean Ministry of Economy) and Millennium Nucleus {\textquoteleft}Protoplanetary Disks{\textquoteright}. MB acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) through project Kr 2164/15-1. JC acknowledges support from Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica-Chile through FONDE-CYT (1141175) and Basal (PFB0609) grants. CS acknowledges funding by the VRI Summer Research programme for undergraduates of PUC. The simulations were performed on the Geryon computers at the Center for Astro-Engineering UC (BASAL PFB-06, QUIMAL 130008, Fondequip AIC-57). Funding Information: The authors wish to thank the anonymous referee for helping us clarify this paper. VF and MB acknowledge support from Fondo Nacional de Desarrollo Cient{\'i}fico y Tecnol{\'o}gico (FONDECYT) Postdoctoral Fellowships, projects nos. 3150106 and 3140479. VF, MB, and JC acknowledge support from the Millennium Nucleus RC130007 (Chilean Ministry of Economy) and Millennium Nucleus 'Protoplanetary Disks'. MB acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) through project Kr 2164/15-1. JC acknowledges support from Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica-Chile through FONDECYT (1141175) and Basal (PFB0609) grants. CS acknowledges funding by the VRI Summer Research programme for undergraduates of PUC. The simulations were performed on the Geryon computers at the Center for Astro-Engineering UC (BASAL PFB-06, QUIMAL 130008, Fondequip AIC-57). Publisher Copyright: {\textcopyright} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society",
year = "2017",
month = feb,
day = "1",
doi = "10.1093/mnras/stw2846",
language = "English",
volume = "465",
pages = "2352--2365",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}