Výsledky vyhledávání - "Hernlund, John"

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Persistence of Strong Silica-Enriched Domains in the Earth's Lower Mantle

Autor: Ballmer, Maxim D., Houser, Christine, Hernlund, John W., Wentzcovitch, Renata M., Hirose, Kei

Publikováno v: Nature Geoscience (2017), 10, 236-240

The composition of the lower mantle $-$ comprising 56% of Earth's volume $-$ remains poorly constrained. Among the major elements, Mg/Si ratios ranging from $\sim$0.9$-$1.1, such as in rocky solar-system building blocks (or chondrites), to $\sim$1.2$

Externí odkaz: http://arxiv.org/abs/1803.08026

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Formation, stratification, and mixing of the cores of Earth and Venus

Autor: Jacobson, Seth A., Rubie, David C., Hernlund, John, Morbidelli, Alessandro, Nakajima, Miki

Publikováno v: Earth and Planetary Science Letters, Volume 474, p. 375-386. (2017)

Earth possesses a persistent, internally-generated magnetic field, whereas no trace of a dynamo has been detected on Venus, at present or in the past, although a high surface temperature and recent resurfacing events may have removed paleomagnetic ev

Externí odkaz: http://arxiv.org/abs/1710.01770

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The language of exoplanet ranking metrics needs to change

Autor: Tasker, Elizabeth, Tan, Joshua, Heng, Kevin, Kane, Stephen, Spiegel, David, Brasser, Ramon, Casey, Andrew, Desch, Steven, Dorn, Caroline, Houser, Christine, Hernlund, John, Lasbleis, Marine, Laneuville, Matthieu, Libert, Anne-Sophie, Noack, Lena, Unterborn, Cayman, Wicks, June

Publikováno v: Nature Astronomy, Volume 1, id. 0042 (2017)

We have found many Earth-sized worlds but we have no way of determining if their surfaces are Earth-like. This makes it impossible to quantitatively compare habitability, and pretending we can risks damaging the field.
Comment: Published in Natu

Externí odkaz: http://arxiv.org/abs/1708.01363

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Thermodynamic Limits on Magnetodynamos in Rocky Exoplanets

Autor: Gaidos, Eric, Conrad, Clinton P., Manga, Michael, Hernlund, John

To ascertain whether magnetic dynamos operate in rocky exoplanets more massive or hotter than the Earth, we developed a parametric model of a differentiated rocky planet and its thermal evolution. Our model reproduces the established properties of Ea

Externí odkaz: http://arxiv.org/abs/1005.3523

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