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Spatial segregation of dust grains in transition disks. SPHERE observations of 2MASS J16083070-3828268 and RXJ1852.3-3700
Pinte, C.; Ménard, F.; Dent, W. R. F. +27 more
Context. The mechanisms governing the opening of cavities in transition disks are not fully understood. Several processes have been proposed, but their occurrence rate is still unknown.
Aims: We present spatially resolved observations of two transition disks, and aim at constraining their vertical and radial structure using multiwavelength ob…
Two-Dimensional gcPIC Simulation of Rising-Tone Chorus Waves in a Dipole Magnetic Field
Wang, Xueyi; Wang, Shui; Lu, Quanming +4 more
Rising-tone chorus waves have already been successfully produced in a mirror magnetic field with the use of one- and two-dimensional particle-in-cell (PIC) simulations. However, in reality, the background magnetic field in the inner Earth's magnetosphere is a dipole magnetic field, unlike symmetric mirror fields. In this paper, with the two-dimens…
Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae
Geier, S.; Hermes, J. J.; Gänsicke, B. T. +13 more
We report the discovery of three stars that, along with the prototype LP 40-365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40-365 stars finds ONe-dominated atmospheres enriched with remarkably similar amounts of nuclear ashes of partial O- an…
A Radio Source Coincident with the Superluminous Supernova PTF10hgi: Evidence for a Central Engine and an Analog of the Repeating FRB 121102?
Berger, E.; Chatterjee, S.; Cordes, J. M. +9 more
We present the detection of an unresolved radio source coincident with the position of the Type I superluminous supernova (SLSN) PTF10hgi (z = 0.098) about 7.5 yr post-explosion, with a flux density of F ν (6 GHz) ≈ 47.3 µJy and a luminosity of L ν (6 GHz) ≈ 1.1 × 1028 erg s-1 Hz-1. Th…
Energy Range of Electron Rolling Pin Distribution Behind Dipolarization Front
Xu, Y.; Fu, H. S.; Burch, J. L. +4 more
The electron rolling pin distribution, showing electron pitch angles primarily at 0°, 90°, and 180°, has recently been observed behind dipolarization fronts (DFs) and explained using an analytical model. However, the energy range of such distribution has been unknown so far, owing to the low-resolution data in previous spacecraft missions. Here us…
HST/WFC3 grism observations of z ∼ 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers
Demarco, R.; Brammer, G. B.; Matharu, J. +13 more
Minor mergers are thought to be responsible for the size growth of quiescent field galaxies with decreasing redshift. We test this hypothesis using the cluster environment as a laboratory. Satellite galaxies in clusters move at high velocities, making mergers between them rare. The stellar mass-size relation in 10 clusters and in the field is meas…
Aggregate Hazes in Exoplanet Atmospheres
de Pater, Imke; Morley, Caroline V.; Gao, Peter +1 more
Photochemical hazes have frequently been used to interpret exoplanet transmission spectra that show an upward slope toward shorter wavelengths and weak molecular features. While previous studies have only considered spherical haze particles, photochemical hazes composed of hydrocarbon aggregate particles are common throughout the solar system. We …
HATS-70b: A 13 MJ Brown Dwarf Transiting an A Star
Henning, T.; Mancini, L.; Rabus, M. +23 more
We report the discovery of HATS-70b, a transiting brown dwarf at the deuterium burning limit. HATS-70b has a mass of {M}p={12.9}-1.6+1.8 {M}Jup} and a radius of {R}p={1.384}-0.074+0.079 {R}Jup}, residing in a close-in orbit with a period of 1.89 days. The host …
Blobs, spiral arms, and a possible planet around HD 169142
Henning, T.; Fantinel, D.; D'Orazi, V. +24 more
Context. Young planets are expected to cause cavities, spirals, and kinematic perturbations in protostellar disks that may be used to infer their presence. However, a clear detection of still-forming planets embedded within gas-rich disks is still rare.
Aims: HD 169142 is a very young Herbig Ae-Be star surrounded by a pre-transitional disk, c…
Mars atmospheric chemistry simulations with the GEM-Mars general circulation model
Daerden, F.; Neary, L.; Viscardy, S. +5 more
General Circulation Models with interactive physical and chemistry processes are the state-of-the-art tools for an integrated view and understanding of the Martian atmosphere and climate system. The GEM-Mars model currently includes 16 tracers for chemical composition and applies a fully online, interactive calculation of the photo- and gas phase …