Academic literature on the topic 'FUV photochemistry'

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Journal articles on the topic "FUV photochemistry"

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Loyd, R. O. Parke, P. C. Schneider, James A. G. Jackman, et al. "Flares, Rotation, Activity Cycles, and a Magnetic Star–Planet Interaction Hypothesis for the Far-ultraviolet Emission of GJ 436." Astronomical Journal 165, no. 4 (2023): 146. http://dx.doi.org/10.3847/1538-3881/acbbc8.

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Abstract Variability in the far-ultraviolet (FUV) emission produced by stellar activity affects photochemistry and heating in orbiting planetary atmospheres. We present a comprehensive analysis of the FUV variability of GJ 436, a field-age M2.5V star (P rot ≈ 44 days) that is orbited by a warm Neptune-sized planet (M ≈ 25 M ⊕, R ≈ 4.1 M ⊕, P orb ≈ 2.6 days). Observations at three epochs from 2012 to 2018 span nearly a full activity cycle, sample two rotations of the star and two orbital periods of the planet, and reveal a multitude of brief flares. From 2012 to 2018, the star’s 7.75 ± 0.10 yr
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Ranjan, Sukrit, Prasanta K. Nayak, J. Sebastian Pineda, and Mayank Narang. "UV Spectral Characterization of Low-mass Stars with AstroSat UVIT for Exoplanet Applications: The Case Study of HIP 23309." Astronomical Journal 166, no. 2 (2023): 70. http://dx.doi.org/10.3847/1538-3881/ace32d.

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Abstract Characterizing rocky exoplanet atmospheres is a key goal of exoplanet science, but interpreting such observations will require understanding the stellar ultraviolet (UV) irradiation incident on the planet from its host star. Stellar UV mediates atmospheric escape, photochemistry, and planetary habitability, and observations of rocky exoplanets can only be understood in the context of the UV spectral energy distribution (SED) of their host stars. Particularly important are SEDs from observationally favorable but poorly understood low-mass M-dwarf stars, which are the only plausible tar
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Linzer, Nora B., Jeong-Gyu Kim, Chang-Goo Kim, and Eve C. Ostriker. "Ultraviolet Radiation Fields in Star-forming Disk Galaxies: Numerical Simulations with TIGRESS-NCR." Astrophysical Journal 975, no. 2 (2024): 173. http://dx.doi.org/10.3847/1538-4357/ad7733.

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Abstract With numerical simulations that employ adaptive ray-tracing (ART) for radiative transfer at the same time as evolving gas magnetohydrodynamics, thermodynamics, and photochemistry, it is possible to obtain a high-resolution view of ultraviolet (UV) fields and their effects in realistic models of the multiphase interstellar medium. Here, we analyze results from TIGRESS-NCR simulations, which follow both far-UV (FUV) wavelengths, important for photoelectric heating and polycyclic aromatic hydrocarbon excitation, and the Lyman continuum (LyC), which photoionizes hydrogen. Considering two
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Cruz Aguirre, F., K. France, N. Nell, et al. "The Radiation Environments of Middle-aged F-type Stars." Astrophysical Journal 956, no. 2 (2023): 79. http://dx.doi.org/10.3847/1538-4357/aced9f.

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Abstract Far-ultraviolet (FUV) emission lines from dwarf stars are important driving sources of photochemistry in planetary atmospheres. Properly interpreting spectral features of planetary atmospheres critically depends on the emission of its host star. While the spectral energy distributions (SEDs) of K- and M-type stars have been extensively characterized by previous observational programs, the full X-ray to infrared SED of F-type stars has not been assembled to support atmospheric modeling. On the second flight of the Suborbital Imaging Spectrograph for Transition-region Irradiance from Ne
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Agúndez, Marcelino, Evelyne Roueff, Franck Le Petit, and Jacques Le Bourlot. "The chemistry of disks around T Tauri and Herbig Ae/Be stars." Astronomy & Astrophysics 616 (August 2018): A19. http://dx.doi.org/10.1051/0004-6361/201732518.

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Context. Infrared and (sub-)millimeter observations of disks around T Tauri and Herbig Ae/Be stars point to a chemical differentiation, with a lower detection rate of molecules in disks around hotter stars. Aims. We aim to investigate the underlying causes of the chemical differentiation indicated by observations and perform a comparative study of the chemistry of T Tauri and Herbig Ae/Be disks. This is one of the first studies to compare the chemistry in the outer regions of these two types of disk. Methods. We developed a model to compute the chemical composition of a generic protoplanetary
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Madden, Jack, and Lisa Kaltenegger. "How surfaces shape the climate of habitable exoplanets." Monthly Notices of the Royal Astronomical Society 495, no. 1 (2020): 1–11. http://dx.doi.org/10.1093/mnras/staa387.

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ABSTRACT Large ground- and space-based telescopes will be able to observe Earth-like planets in the near future. We explore how different planetary surfaces can strongly influence the climate, atmospheric composition, and remotely detectable spectra of terrestrial rocky exoplanets in the habitable zone depending on the host star’s incident irradiation spectrum for a range of Sun-like host stars from F0V to K7V. We update a well-tested 1D climate-photochemistry model to explore the changes of a planetary environment for different surfaces for different host stars. Our results show that using a
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Hajiboland, Roghieh, and Fahimeh Amirazad. "Photochemistry and gas exchange in cold conditions in Zn-deficient red cabbage (Brassica oleracea L. var. capitata f. rubra) plants." Folia Horticulturae 24, no. 1 (2012): 3–11. http://dx.doi.org/10.2478/v10245-012-0001-5.

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Photochemistry and gas exchange in cold conditions in Zn-deficient red cabbage (Brassica oleraceaL. var.capitataf.rubra) plantsThe responses of red cabbage (Brassica oleraceaL. var.capitataf.rubra) plants to a low Zn supply and cold conditions (10°/7°C day/night temperature) were investigated in a hydroponic growing medium. A low Zn supply caused a significant reduction of shoot and root dry weight - up to 55% and 45% for the control and 62% and 52% for cold-treated plants, respectively. The total soluble carbohydrates and starch declined in Zn-deficient plants. Exposure to low temperatures, h
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Liao, Jung-Chi, Chih-Wei Chang, Yi-De Chen, et al. "Abstract 5638: Total-sync ultra-content microscopic opto-biotinylation enables high-sensitivity hypothesis-free subcellular protein discovery." Cancer Research 83, no. 7_Supplement (2023): 5638. http://dx.doi.org/10.1158/1538-7445.am2023-5638.

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Abstract High-sensitivity hypothesis-free subcellular proteomics is challenging due to the limited sensitivity of mass spectrometry and the lack of amplification tools for proteins. Without such technology, it is not possible to discover proteins at specific locations of interest in cells or tissue samples. Here, we introduce a total-sync ultra-content microscopic system termed MicroscoopTM that integrates microscopy, optics, FPGA-based mechatronics, photochemistry, and deep learning or computer vision to enable high-content in situ photolabeling. MicroscoopTM photolabels proteins at user defi
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Schroetter, I., O. Berné, J. R. Goicoechea, et al. "PDRs4All XV. CH radical and H3+ molecular ion in the irradiated protoplanetary disk d203-506." Astronomy & Astrophysics, July 10, 2025. https://doi.org/10.1051/0004-6361/202555841.

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Most protoplanetary disks experience a phase in which they are subjected to strong ultraviolet radiation from nearby massive stars. This UV radiation can substantially alter their chemistry by producing numerous radicals and molecular ions. In this Letter we present a detailed analysis of the JWST-NIRSpec spectrum of the d203-506 obtained as part of the PDRs4All Early Release Science program. Using state-of-the-art spectroscopic data, we searched for species using a multi-molecule fitting tool PAHTATmol which we developed for this purpose. Based on this analysis, we report the clear detection
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Dissertations / Theses on the topic "FUV photochemistry"

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Mouzay, Julie. "Etude de l'évolution photochimique des aérosols de Titan." Electronic Thesis or Diss., Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0473.

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Cette thèse porte sur l’étude de l’évolution photochimique des aérosols présents dans la stratosphère de Titan. Au début de la saison automnale au pôle sud, la stratosphère, atteinte par des rayonnements FUV solaires, s’est refroidie et particulièrement enrichie en matériaux organiques : en aérosols, ainsi qu’en benzène (C6H6) et cyanure hydrogène (HCN), formés à haute altitude, qui ont été à l’origine de la formation de nuages de glace saisonniers. Expérimentalement, la photochimie de ces glaces, induite par des rayonnements UV similaires à ceux parvenant dans la basse stratosphère (l > 23
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Book chapters on the topic "FUV photochemistry"

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Orna, Mary Virginia. "Finale: Color in Foods, Photochemistry, Photoluminescence, Pharmaceuticals, Fireworks, Fun, and the Future." In SpringerBriefs in Molecular Science. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32642-4_8.

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