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2 months ago | 
aanda.org | Johns Hopkins |Observatoire de Paris |Université PSL
Home All issues Volume 693 (January 2025) A&A, 693 (2025) A315 Full HTML Issue A&A Volume 693, January 2025 Article Number A315 Number of page(s) 9 Section Planets, planetary systems, and small bodies DOI https://doi.org/10.1051/0004-6361/202452695 Published online 29 January 2025 A&A, 693, A315 (2025) First unambiguous detection of ammonia in the atmosphere of a planetary mass companion with JWST/MIRI coronagraphs 1,2,3★, 3, 3, 3, 3, 4, 5,6,7, 8,9, 10, 11, 12, 13, 3, 14, 15, 16, 11, 9, 17,...
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2 months ago | 
academic.oup.com | Université PSL |De Carli
The faithful duplication of the genome is an essential and challenging event for all cells because it must robustly ensure efficient proliferation while maintaining genome stability. DNA replication starts from sites called replication origins; tens of thousands of origins are activated according to a regulated spatial and temporal program in each vertebrate cell to duplicate the chromosomes in a limited time window during the cell cycle.
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Jan 23, 2025 | 
academic.oup.com | Observatoire de Paris |Université PSL
We analyse the stellar distributions on the [Fe/H]-[Mg/Fe] plane for 11 Milky Way-mass galaxies from the FIRE-2 cosmological baryonic zoom-in simulations. Alpha-element bimodality, in the form of two separate sequences on the [Fe/H]-[Mg/Fe] plane, is not a universal feature of disk galaxies.
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Nov 1, 2024 | 
pubs.aip.org | Département de Physique |École Normale Supérieure |Université PSL
Global data transmission is witnessing an unprecedented surge in daily data flows and keeps on increasing the need for dependable high-speed data communication. Free-Space Optics (FSO) has attracted interest as a possible solution to the so-called “last mile” connectivity problems,1 to replace fiber connections whenever their installation is too expensive or not permanent.
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Sep 24, 2024 | 
academic.oup.com | Observatoire de Paris |Université PSL
The Martian Moon eXploration (MMX) is a sample return mission from the Japanese Space Agency (JAXA) (Kuramoto et al. 2022), scheduled to be originally launched towards the Martian system in 2024 but was recently postponed to 2026. MMX will study the Martian atmosphere, characterize the surface of the Martian satellites Phobos and Deimos using remote sensing observations, delivering a rover to interact with the surface of Phobos and returning Phobos sample to Earth.
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Sep 24, 2024 | 
academic.oup.com | Observatoire de Paris |Université PSL
The MIRS infrared spectrometer is part of the scientific payload of JAXA’s Martian Moon eXploration (MMX) mission. From the reflected sunlight by the planetary surfaces, MIRS will provide information on the Mars atmosphere and the mineralogy and chemistry of its moons. Spectra carried out by the instrument (0.9-3.6 µm) include the thermal emission from the surface, which needs to be modeled and removed to extract the compositional information.
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Sep 13, 2024 | 
academic.oup.com | ESPCI Paris |Université PSL
Hard pans, soil compaction, soil aggregation, and stones create physical barriers that can affect the development of a root system. Roots are known to exploit paths of least resistance to avoid such obstacles, but the mechanism through which this is achieved is not well understood. Here, we used a combination of 3D-printed substrates with a high-throughput live-imaging platform to study the responses of maize roots to a range of physical barriers.
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Jul 25, 2024 | 
academic.oup.com | Observatoire de Paris |Université PSL
A population of ions drifting at super-Alfvénic speeds with respect to a magnetized ambient plasma can trigger various streaming instabilities, leading to the exponential growth of electromagnetic perturbations across a wide range of astrophysical environments (Kulsrud & Pearce 1969; Gary et al. 1984; Winske & Leroy 1984; Bell 2004; Amato & Blasi 2009; Amato 2014; Cui, Pühlhofer & Santangelo 2016).
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Jun 25, 2024 | 
academic.oup.com | Université PSL |Institut Paoli-Calmettes
The eukaryotic genome is folded in 3D within a compartmentalized nucleus. Nuclear organization constitutes a critical layer of regulation of DNA-associated transactions and an important determinant of genome integrity (1). The stability of the genome is jeopardized during DNA replication; the progression of the replisome being recurrently threatened by a broad spectrum of obstacles that cause replication fork slowing, temporary fork stalling or terminal fork collapse (2).
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May 31, 2024 | 
academic.oup.com | Departamento de Astrofísica |Space Exploration |An OCC |Université PSL
We present a Bayesian inference method to characterise the dust emission properties using the well-known dust- correlation in the diffuse interstellar medium at Planck frequencies ν ≥ 217 GHz. We use the Galactic map from the Galactic All-Sky Survey (GASS) as a template to trace the Galactic dust emission. We jointly infer the pixel-dependent dust emissivity and the zero level present in the Planck intensity maps.
