FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3094370911> ?p ?o ?g. }

• W3094370911 endingPage "A19" @default.
• W3094370911 startingPage "A19" @default.
• W3094370911 abstract "Context. Long-lived radioactive nuclides, such as 40 K, 232 Th, 235 U, and 238 U, contribute to persistent heat production in the mantle of terrestrial-type planets. As refractory elements, the concentrations of Th and U in a terrestrial exoplanet are implicitly reflected in the photospheric abundances of the stellar host. However, a robust determination of these stellar abundances is difficult in practice owing to the general paucity and weakness of the relevant spectral features. Aims. We draw attention to the refractory, r -process element europium, which may be used as a convenient and practical proxy for the population analysis of radiogenic heating in exoplanetary systems. Methods. As a case study, we present a determination of Eu abundances in the photospheres of α Cen A and B with high-resolution HARPS spectra and a strict line-by-line differential analysis. To first order, the measured Eu abundances can be converted into the abundances of 232 Th, 235 U, and 238 U with observational constraints, while the abundance of 40 K is approximated independently with a Galactic chemical evolution model. Results. Our determination shows that europium is depleted with respect to iron by ~0.1 dex and to silicon by ~0.15 dex compared to solar in the two binary components. The loci of α Cen AB at the low-ends of both [Eu/Fe] and [Eu/Si] distributions of a large sample of FGK stars further suggest significantly lower potential of radiogenic heat production in any putative terrestrial-like planet (i.e. α -Cen-Earth) in this system compared to that in rocky planets (including our own Earth) that formed around the majority of these Sun-like stars. Based on our calculations of the radionuclide concentrations in the mantle and assuming the mantle mass to be the same as that of our Earth, we find that the radiogenic heat budget in an α -Cen-Earth is 73.4 −6.9 +8.3 TW upon its formation and 8.8 −1.3 +1.7 TW at the present day, which is 23 ± 5% and 54 ± 5% lower than that in the Hadean Earth (94.9 ± 5.5 TW) and in the modern Earth (19.0 ± 1.1 TW), respectively. Conclusions. As a consequence, mantle convection in an α -Cen-Earth is expected to be overall weaker than that of Earth (assuming other conditions are the same), and thus such a planet would be less geologically active, suppressing its long-term potential to recycle its crust and volatiles. With Eu abundances being available for a large sample of Sun-like stars, the proposed approach can extend our ability to predict the nature of other rocky worlds that can be tested by future observations." @default.
• W3094370911 created "2020-10-29" @default.
• W3094370911 creator A5041926746 @default.
• W3094370911 creator A5065547263 @default.
• W3094370911 creator A5068920295 @default.
• W3094370911 creator A5075863147 @default.
• W3094370911 date "2020-11-24" @default.
• W3094370911 modified "2023-10-16" @default.
• W3094370911 title "Europium as a lodestar: diagnosis of radiogenic heat production in terrestrial exoplanets" @default.
• W3094370911 cites W1506990781 @default.
• W3094370911 cites W1588138813 @default.
• W3094370911 cites W1594412726 @default.
• W3094370911 cites W1880070029 @default.
• W3094370911 cites W1942800319 @default.
• W3094370911 cites W1967208649 @default.
• W3094370911 cites W1975818093 @default.
• W3094370911 cites W1977809024 @default.
• W3094370911 cites W2001934797 @default.
• W3094370911 cites W2004756956 @default.
• W3094370911 cites W2005730211 @default.
• W3094370911 cites W2007479520 @default.
• W3094370911 cites W2037763525 @default.
• W3094370911 cites W2045829695 @default.
• W3094370911 cites W2050629270 @default.
• W3094370911 cites W2051119792 @default.
• W3094370911 cites W2062049384 @default.
• W3094370911 cites W2062783270 @default.
• W3094370911 cites W2065193424 @default.
• W3094370911 cites W2074086027 @default.
• W3094370911 cites W2086336414 @default.
• W3094370911 cites W2087568496 @default.
• W3094370911 cites W2088606692 @default.
• W3094370911 cites W2096471541 @default.
• W3094370911 cites W2102530828 @default.
• W3094370911 cites W2103165993 @default.
• W3094370911 cites W2103367868 @default.
• W3094370911 cites W2119925039 @default.
• W3094370911 cites W2126331421 @default.
• W3094370911 cites W2126912476 @default.
• W3094370911 cites W2138613133 @default.
• W3094370911 cites W2143531662 @default.
• W3094370911 cites W2160024096 @default.
• W3094370911 cites W2161866432 @default.
• W3094370911 cites W2195134359 @default.
• W3094370911 cites W2247814521 @default.
• W3094370911 cites W2297864066 @default.
• W3094370911 cites W2340722744 @default.
• W3094370911 cites W2508168437 @default.
• W3094370911 cites W2513121328 @default.
• W3094370911 cites W2521634131 @default.
• W3094370911 cites W2530569153 @default.
• W3094370911 cites W2553073951 @default.
• W3094370911 cites W2556664126 @default.
• W3094370911 cites W2599197132 @default.
• W3094370911 cites W2615622359 @default.
• W3094370911 cites W2616642533 @default.
• W3094370911 cites W2745762782 @default.
• W3094370911 cites W2754352655 @default.
• W3094370911 cites W2756611662 @default.
• W3094370911 cites W2758866920 @default.
• W3094370911 cites W2768440317 @default.
• W3094370911 cites W2776388158 @default.
• W3094370911 cites W2783292105 @default.
• W3094370911 cites W2803242398 @default.
• W3094370911 cites W2888934611 @default.
• W3094370911 cites W2890711907 @default.
• W3094370911 cites W2896251583 @default.
• W3094370911 cites W2896976353 @default.
• W3094370911 cites W2899352326 @default.
• W3094370911 cites W2899497983 @default.
• W3094370911 cites W2914638373 @default.
• W3094370911 cites W2942777410 @default.
• W3094370911 cites W2948416465 @default.
• W3094370911 cites W2950781382 @default.
• W3094370911 cites W2954295802 @default.
• W3094370911 cites W2963944055 @default.
• W3094370911 cites W2970413145 @default.
• W3094370911 cites W2979673932 @default.
• W3094370911 cites W2990448463 @default.
• W3094370911 cites W3000027803 @default.
• W3094370911 cites W3002618194 @default.
• W3094370911 cites W3009274849 @default.
• W3094370911 cites W3027856248 @default.
• W3094370911 cites W3098103509 @default.
• W3094370911 cites W3098842193 @default.
• W3094370911 cites W3098988536 @default.
• W3094370911 cites W3099560008 @default.
• W3094370911 cites W3099618402 @default.
• W3094370911 cites W3099916238 @default.
• W3094370911 cites W3100335838 @default.
• W3094370911 cites W3101099262 @default.
• W3094370911 cites W3101309368 @default.
• W3094370911 cites W3101627046 @default.
• W3094370911 cites W3101666362 @default.
• W3094370911 cites W3102065256 @default.
• W3094370911 cites W3103212710 @default.
• W3094370911 cites W3103991089 @default.
• W3094370911 cites W3105104582 @default.

• next