Extrasolar comets: The origin of dust in exozodiacal disks?
| العنوان: | Extrasolar comets: The origin of dust in exozodiacal disks? |
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| المؤلفون: | J. C. Augereau, Amy Bonsor, U. Marboeuf |
| المصدر: | Planetary and Space Science. 133:47-62 |
| بيانات النشر: | Elsevier BV, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Solar System, 010504 meteorology & atmospheric sciences, Comet dust, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Luminosity, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Cosmic dust, Earth and Planetary Astrophysics (astro-ph.EP), Physics, Zodiacal light, Astronomy, Astronomy and Astrophysics, Planetary system, Space and Planetary Science, Interstellar comet, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Exocomet |
| الوصف: | Comets have been invoked in numerous studies as a potentially important source of dust and gas around stars, but none has studied the thermo-physical evolution, out-gassing rate, and dust ejection of these objects in such stellar systems. We investigate the thermo-physical evolution of comets in exo-planetary systems in order to provide valuable theoretical data required to interpret observations of gas and dust. We use a quasi 3D model of cometary nucleus to study the thermo-physical evolution of comets evolving around a single star from 0.1 to 50 AU, whose homogeneous luminosity varies from 0.1 to 70 solar luminosities. This paper provides mass ejection, lifetimes, and the rate of dust and water gas mass productions for comets as a function of the distance to the star and stellar luminosity. Results show significant physical changes to comets at high stellar luminosities. The models are presented in such a manner that they can be readily applied to any planetary system. By considering the examples of the Solar System, Vega and HD 69830, we show that dust grains released from sublimating comets have the potential to create the observed (exo)zodiacal emission. We show that observations can be reproduced by 1 to 2 massive comets or by a large number of comets whose orbits approach close to the star. Our conclusions depend on the stellar luminosity and the uncertain lifetime of the dust grains. We find, as in previous studies, that exozodiacal dust disks can only survive if replenished by a population of typically sized comets renewed from a large and cold reservoir of cometary bodies beyond the water ice line. These comets could reach the inner regions of the planetary system following scattering by a (giant) planet. Comment: 21 pages, 10 figures |
| تدمد: | 0032-0633 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4dd0ae54330a69d0a6a38544bbadae59 https://doi.org/10.1016/j.pss.2016.03.014 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....4dd0ae54330a69d0a6a38544bbadae59 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00320633 |
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