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- University of ArizonaUS251 papers
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26 papers · 1 filter
A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b
David Ehrenreich, Vincent Bourrier, Peter J. Wheatley +8
Exoplanets orbiting close to their parent stars could lose some fraction of their atmospheres because of the extreme irradiation. Atmospheric mass loss primarily affects low-mass e…
Miscibility calculations for water and hydrogen in giant planets
François Soubiran, Burkhard Militzer
We present results from ab initio simulations of liquid water-hydrogen mixtures in the range from 2 to 70 GPa and from 1000 to 6000 K, covering conditions in the interiors of ice g…
Measurements of Newton's gravitational constant and the length of day
John D. Anderson, Gerald Schubert, Virginia Trimble +1
About a dozen measurements of Newton's gravitational constant, G, since 1962 have yielded values that differ by far more than their reported random plus systematic errors. We find…
Nonphotosynthetic Pigments as Potential Biosignatures
Edward W. Schwieterman, Charles S. Cockell, Victoria S. Meadows
Previous work on possible surface reflectance biosignatures for Earth-like planets has typically focused on analogues to spectral features produced by photosynthetic organisms on E…
The Mutual Orbit, Mass, and Density of the Large Transneptunian Binary System Varda and Ilmarë
W. M. Grundy, S. B. Porter, S. D. Benecchi +7
From observations by the Hubble Space Telescope, Keck II Telescope, and Gemini North Telescope, we have determined the mutual orbit of the large transneptunian object (174567) Vard…
Methane storms as a driver of Titan's dune orientation
Benjamin Charnay, Erika Barth, Scot Rafkin +5
Titan's equatorial regions are covered by eastward propagating linear dunes. This direction is opposite to mean surface winds simulated by Global Climate Models (GCMs), which are o…