Mostrar el registro sencillo del ítem

Obliquity Evolution of Earth-Like Exoplanets in Systems with Large Inclinations

dc.contributor.authorDEITRICK, Russell,
hal.structure.identifierJohns Hopkins University Applied Physics Laboratory [Laurel, MD] [APL]
dc.contributor.authorBARNES, Rory,
dc.contributor.authorGREENBERG, Richard,
dc.contributor.authorQUINN, Thomas R.,
hal.structure.identifierECLIPSE 2015
dc.contributor.authorRAYMOND, Sean N.
dc.date.issued2015
dc.date.conference2014-11-09
dc.description.abstractEnIn order to properly assess the potential for habitability and prioritize target selection for the characterization of exoplanets, we need to understand the limits of orbital and rotational dynamics. Large satellites may be rare and very difficult to detect. Consequently, it is necessary to quantify the likelihood of a planet's having extreme obliquity cycles in the absence of a moon and to model the potential impact on the planet's climate. We explore the obliquity evolution of (1) known exoplanet systems that could contain Earth-like planets in the habitable zone and (2) hypothetical planets in mutually inclined, chaotic resonant configurations that experience some of the most extreme orbital evolution possible. We use a secular obliquity model coupled to either an N-body models or a 4th order secular orbital model.We find that in some known systems, planets' obliquity variations are small and unlikely to have a major effect on climate, unless undetected planets are present. Systems with three or more planets are significantly more dynamically rich, with planets that undergo obliquity changes of ~10° over 50,000 years and >30° over a few million years. In resonant configurations, Earth-like exoplanets can undergo dramatic and chaotic evolution in eccentricity and inclination while remaining stable for over 10 Gyr. In configurations in which eccentricities and inclinations stay below ~0.1 and ~10°, respectively, obliquities oscillate quasi-periodically with amplitudes similar to the non-resonant, three-planet configurations. In more dynamically active configurations, in which eccentricities and inclinations evolve to e > 0.3 and i > 15°, obliquities can extend from ~0° to well past 90°. In extreme cases eccentricities can reach >0.9999 and inclinations >179.9 degrees, driving precession rates in excess of degrees per year. However, these planets can graze or impact the stellar surface and are probably not habitable.
dc.language.isoen
dc.title.enObliquity Evolution of Earth-Like Exoplanets in Systems with Large Inclinations
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.page100.03
bordeaux.volume46
bordeaux.countryUS
bordeaux.conference.cityTucson
bordeaux.peerReviewednon
hal.identifierhal-01149645
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2014-11-14
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01149645v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2015&rft.volume=46&rft.spage=100.03&rft.epage=100.03&rft.au=DEITRICK,%20Russell,&BARNES,%20Rory,&GREENBERG,%20Richard,&QUINN,%20Thomas%20R.,&RAYMOND,%20Sean%20N.&rft.genre=unknown


Archivos en el ítem

ArchivosTamañoFormatoVer

No hay archivos asociados a este ítem.

Este ítem aparece en la(s) siguiente(s) colección(ones)

Mostrar el registro sencillo del ítem