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Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D
van Loon, J. Th.; Larsson, J.; Lundqvist, P. +21 more
Most massive stars end their lives in core-collapse supernova explosions and enrich the interstellar medium with explosively nucleosynthesized elements. Following core collapse, the explosion is subject to instabilities as the shock propagates outward through the progenitor star. Observations of the composition and structure of the innermost regio…
CHEERS: The chemical evolution RGS sample
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +17 more
Context. The chemical yields of supernovae and the metal enrichment of the intra-cluster medium (ICM) are not well understood. The hot gas in clusters of galaxies has been enriched with metals originating from billions of supernovae and provides a fair sample of large-scale metal enrichment in the Universe. High-resolution X-ray spectra of cluster…
Magnetized Kelvin-Helmholtz instability: theory and simulations in the Earth's magnetosphere context
Califano, Francesco; Faganello, Matteo
The Kelvin-Helmholtz instability, proposed a long time ago for its role in and impact on the transport properties at magnetospheric flanks, has been widely investigated in the Earth's magnetosphere context. This review covers more than fifty years of theoretical and numerical efforts in investigating the evolution of Kelvin-Helmholtz vortices and …
Constraints on Quenching of Z ≲ 2 Massive Galaxies from the Evolution of the Average Sizes of Star-forming and Quenched Populations in COSMOS
Ilbert, O.; Scoville, N. Z.; Carollo, C. M. +5 more
We use >9400 {log}(m/{M}⊙ )> 10 quiescent and star-forming galaxies at z ≲ 2 in COSMOS/UltraVISTA to study the average size evolution of these systems, with focus on the rare ultra-massive population at {log}(m/{M}⊙ )> 11.4. The large 2 square degree survey area delivers a sample of ∼400 such ultra-massive systems. A…
WASP-167b/KELT-13b: joint discovery of a hot Jupiter transiting a rapidly rotating F1V star
Queloz, D.; Ségransan, D.; Collier Cameron, A. +46 more
We report the joint WASP/KELT discovery of WASP-167b/KELT-13b, a transiting hot Jupiter with a 2.02-d orbit around a V = 10.5, F1V star with [Fe/H] = 0.1 ± 0.1. The 1.5 RJup planet was confirmed by Doppler tomography of the stellar line profiles during transit. We place a limit of <8 MJup on its mass. The planet is in a re…
Hot oxygen escape from Mars: Simple scaling with solar EUV irradiance
Luhmann, J.; Cravens, T. E.; Combi, M. +8 more
The evolution of the atmosphere of Mars and the loss of volatiles over the lifetime of the solar system is a key topic in planetary science. An important loss process for atomic species, such as oxygen, is ionospheric photochemical escape. Dissociative recombination of O2+ ions (the major ion species) produces fast oxygen ato…
Resolved astrometric orbits of ten O-type binaries
Absil, O.; Ertel, S.; Grellmann, R. +11 more
Aims: Our long-term aim is to derive model-independent stellar masses and distances for long period massive binaries by combining apparent astrometric orbit with double-lined radial velocity amplitudes (SB2).
Methods: We followed-up ten O+O binaries with AMBER, PIONIER and GRAVITY at the VLTI. Here, we report on 130 astrometric observati…
Deuteration of ammonia in the starless core Ophiuchus/H-MM1
Daniel, F.; Schlemmer, S.; Güsten, R. +13 more
Context. Ammonia and its deuterated isotopologues probe physical conditions in dense molecular cloud cores. The time-dependence of deuterium fractionation and the relative abundances of different nuclear spin modifications are supposed to provide a means of determining the evolutionary stages of these objects.
Aims: We aim to test the current…
Lyman continuum leaking AGN in the SSA22 field
Inoue, Akio K.; Iwata, Ikuru; Micheva, Genoveva
Subaru/SuprimeCam narrow-band photometry of the SSA22 field reveals the presence of four Lyman continuum (LyC) candidates among a sample of 14 active galactic nuclei (AGNs). Two show offsets and likely have stellar LyCin nature or are foreground contaminants. The remaining two LyC candidates are type I AGN. We argue that the average LyC escape fra…
Morpho-kinematics of z ∼ 1 galaxies probe the hierarchical scenario
Flores, H.; Hammer, F.; Puech, M. +2 more
We have studied a representative sample of intermediate-mass galaxies at z ∼ 1, observed by the kinematic survey KMOS3D. We have re-estimated the kinematical parameters from the published kinematic maps and analysed photometric data from Hubble Space Telescope (HST) to measure optical disc inclinations and Position Angle. We find that o…