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Effects of Variable Eccentricity on the Climate of an Earth-like World
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. NASA, Goddard Inst Space Studies, 2880 Broadway, New York, NY 10025 USA..
New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates..ORCID iD: 0000-0002-7071-5437
2017 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 835, no 1, L1Article in journal (Refereed) Published
Abstract [en]

The Kepler era of exoplanetary discovery has presented the astronomical community with a cornucopia of planetary systems that are very different from the one that we inhabit. It has long been known that Jupiter plays a major role in the orbital parameters of Mars and its climate, but there is also a long-standing belief that Jupiter would play a similar role for Earth if not for the Moon. Using a three-dimensional general circulation model (3D GCM) with a fully coupled ocean, we simulate what would happen to the climate of an Earth-like world if Mars did not exist, but a Jupiter-like planet was much closer to Earth's orbit. We investigate two scenarios that involve the evolution of the Earth-like planet's orbital eccentricity from 0 to 0.283 over 6500 years, and from 0 to 0.066 on a timescale of 4500 years. In both cases we discover that they would maintain relatively temperate climates over the timescales simulated. More Earth-like planets in multi-planet systems will be discovered as we continue to survey the skies and the results herein show that the proximity of large gas giant planets may play an important role in the habitability of these worlds. These are the first such 3D GCM simulations using a fully coupled ocean with a planetary orbit that evolves over time due to the presence of a giant planet.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 835, no 1, L1
Keyword [en]
astrobiology, planets and satellites: atmospheres, planets and satellites: terrestrial planets
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-318605DOI: 10.3847/2041-8213/835/1/L1ISI: 000393974000001OAI: oai:DiVA.org:uu-318605DiVA: diva2:1086013
Available from: 2017-03-31 Created: 2017-03-31 Last updated: 2017-03-31Bibliographically approved

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Way, Michael J.Georgakarakos, Nikolaos
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