Results 1 to 10 of about 9,374,373 (212)

Effect of Laboratory Reagents for Cleaning Modern Contamination on the δ<sup>15</sup>N Integrity of Nitrogen-Poor Samples. [PDF]

open access: yesRapid Commun Mass Spectrom
ABSTRACT Rationale Nitrogen isotope values have been widely used for tracing ancient biogeochemical processes, but contaminant‐sensitive materials, such as Precambrian sedimentary rocks, meteorites, or returned extraterrestrial samples, often have low nitrogen levels and are thus vulnerable to modern organic contamination.
Bubphamanee K, Schauer A, Buick R.
europepmc   +2 more sources

A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates

open access: yesGeophysical Monograph Series, Page 47-54., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky   +2 more
wiley  

+2 more sources

A Comparison of the Composition of Planets in Single-planet and Multiplanet Systems Orbiting M dwarfs

open access: yesThe Astronomical Journal, 2023
We investigate and compare the composition of M-dwarf planets in systems with only one known planet (“singles”) to those residing in multiplanet systems (“multis”) and the fundamental properties of their host stars.
Romy Rodríguez Martínez   +6 more
doaj   +1 more source

Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star

open access: yesThe Astronomical Journal, 2023
We present a validation of a long-period ( ${91.68278}_{-0.00041}^{+0.00032}$ days) transiting sub-Neptune planet, TOI-1221 b (TIC 349095149.01), around a Sun-like ( m _V = 10.5) star.
Christopher Mann   +27 more
doaj   +1 more source

Kepler-80 Revisited: Assessing the Participation of a Newly Discovered Planet in the Resonant Chain

open access: yesThe Astronomical Journal, 2023
In this paper, we consider the chain of resonances in the Kepler-80 system and evaluate the impact that the additional member of the resonant chain discovered by Shallue & Vanderburg has on the dynamics of the system and the physical parameters that can ...
D. Weisserman   +2 more
doaj   +1 more source

Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2–18

open access: yesThe Astronomical Journal, 2022
The NASA K2 mission, salvaged from the hardware failures of the Kepler telescope, has continued Kepler’s planet-hunting success. It has revealed nearly 500 transiting planets around the ecliptic plane, many of which are the subject of further study, and ...
Jessie L. Christiansen   +41 more
doaj   +1 more source

ROME. III. The Arecibo Search for Star–Planet Interactions at 5 GHz

open access: yesThe Astrophysical Journal, 2023
After nearly three decades of discovery, many exoplanetary systems have been studied and characterized in detail with one important exception: exoplanet magnetism.
Matthew Route, Alexander Wolszczan
doaj   +1 more source

VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars

open access: yesThe Astronomical Journal, 2023
NASA’s Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission designed to find transiting exoplanets orbiting nearby bright stars. It has identified more than 329 transiting exoplanets, and almost 6000 candidates remain unvalidated. In
Priyashkumar Mistry   +50 more
doaj   +1 more source

DYNAMIC EVOLUTION EXOPLANET SYSTEMS, MOVING IN ORBITAL RESONANCES WITH THE ACCOUNT OF SECULAR PERTURBATION FROM N BODIES

open access: yesOdessa Astronomical Publications, 2017
Equations of exoplanet's motion connected with orbital Lindblad resonances with the account of secular terms caused by gravitational non-resonant perturbation are derived. Qualitative researches of orbital evolution modeling exoplanet systems are carried
B. R. Mushailov, A. K. Chuyas
doaj   +1 more source

Giant Outer Transiting Exoplanet Mass (GOT ’EM) Survey. III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-transit Jupiter Orbiting TOI-2010

open access: yesThe Astronomical Journal, 2023
Large-scale exoplanet surveys like the Transiting Exoplanet Survey Satellite (TESS) mission are powerful tools for discovering large numbers of exoplanet candidates.
Christopher R. Mann   +50 more
doaj   +1 more source

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