Results 41 to 50 of about 4,846 (203)

Helium Atmospheres May Hide in Current Exoplanet Analysis Frameworks

The Astrophysical Journal Letters
The increasing number of detailed exoplanet observations offers an opportunity to refine our analyses and interpretations. Here, we show that atmospheres that appear volatile-rich and/or cloudy may instead be helium-rich.
Julien de Wit, Aaron Householder, Prajwal Niraula   +2 more
doaj   +1 more source

SmallSat interferometry for THz astrophysics

, 2018
While great strides have been made in far-infrared astrophysics with the NASA Spitzer and ESA Herschel missions, subarcsecond spatial resolution from space is still beyond the reach of current technologies. The Atacama Large Millimeter Array has produced
Pilyavsky, Genady, Tang, Adrian, Christopher E. Groppi, Christopher K. Walker, Genady Pilyavsky, Walker, Christopher K., Jose V. Siles, Jeremy Whitton, Whitton, Jeremy, Hoh, Jonathan, Adrian Tang, Jonathan Hoh, Paul F. Goldsmith, Philip Mauskopf, Goldsmith, Paul F., Mauskopf, Philip, Siles, Jose V., Groppi, Christopher E.   +17 more
core   +1 more source

Microlensing for extrasolar planets : improving the photometry [PDF]

, 2013
Gravitational Microlensing, as a technique for detecting Extrasolar Planets, is recognised for its potential in discovering small-mass planets similar to Earth, at a distance of a few Astronomical Units from their host stars.
Bajek, David J.
core   +2 more sources

A Microkrystite from the Australasian Tektite/Microtektite Strewn Field

Meteoritics &Planetary Science, EarlyView.
Abstract Microkrystites are glassy impact spherules. They contain primary crystallites carrying information on the physical and chemical conditions prevailing during vaporization, melting, and ejection in large impact cratering events. We report on the geochemistry and mineralogy down to nanometer scale of the first microkrystite (ODP1144A,14) from the
Matteo Del Rio, Luigi Folco, Matteo Masotta, Ana Černok, Enrico Mugnaioli   +4 more
wiley   +1 more source

The erosion of large primary atmospheres typically leaves behind substantial secondary atmospheres on temperate rocky planets

Nature Communications
Exoplanet exploration has revealed that many—perhaps most—terrestrial exoplanets formed with substantial H2-rich envelopes, seemingly in contrast to solar system terrestrials, for which there is scant evidence of long-lived primary atmospheres. It is not
Joshua Krissansen-Totton, Nicholas Wogan, Maggie Thompson, Jonathan J. Fortney   +3 more
doaj   +1 more source

HD 23472: a multi-planetary system with three super-Earths and two potential super-Mercuries,

, 2023
Context. Comparing the properties of planets orbiting the same host star, and thus formed from the same accretion disc, helps in constraining theories of exoplanet formation and evolution.
Seager, Sara
core   +1 more source

Water and hydroxyl on asteroid Bennu: Reconciling remote observations with OSIRIS‐REx sample analysis

Meteoritics &Planetary Science, EarlyView.
Abstract This study investigates the spatial distribution and spectral characteristics of the broad hydration feature near 3 μm across the surface of asteroid (101955) Bennu using OVIRS (OSIRIS‐REx Visible and InfraRed Spectrometer) data. We analyzed multiple global OVIRS data sets obtained at different times throughout the Bennu day, revealing ...
Hannah H. Kaplan, Amy A. Simon, Victoria E. Hamilton, Joshua P. Emery, Dennis Reuter, Andy J. López‐Oquendo   +5 more
wiley   +1 more source

Assessing the analytical capabilities of handheld laser‐induced breakdown spectroscopy (hLIBS) on corroded iron objects of possible meteoritic origin

Meteoritics &Planetary Science, EarlyView.
Abstract Despite meteorites having been recognized as the source of iron in some ancient iron artifacts, few archeological irons have been analyzed so far, as invasive methods are precluded. In this work, four iron knives and one axe collected near Guelmime and Imilchil (Morocco) were investigated by advanced analytical techniques, including handheld ...
Giorgio S. Senesi, Albert Jambon, Olga De Pascale, Lahcen Ouknine, Hassan Nachit, Fouad Khiri, Abderrahmane Ibhi   +6 more
wiley   +1 more source

Solar evolution and extrema: current state of understanding of long-term solar variability and its planetary impacts

Progress in Earth and Planetary Science, 2021
The activity of stars such as the Sun varies over timescales ranging from the very short to the very long—stellar and planetary evolutionary timescales.
Dibyendu Nandy, Petrus C. H. Martens, Vladimir Obridko, Soumyaranjan Dash, Katya Georgieva   +4 more
doaj   +1 more source

Thermal history, collisional history, and structure of the CK‐chondrite parent body

Meteoritics &Planetary Science, EarlyView.
Abstract Major chondrite groups (H, L, LL, R, EH, EL, CK) with some members of petrologic type 5 and 6 also have some members of types 3 and 4; they do not have members of type 1 or 2. Their parent bodies had onion‐shell structures and were internally heated by the decay of 26Al.
Alan E. Rubin
wiley   +1 more source