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HST Survey of the Orion Nebula Cluster in the H2O 1.4 µm Absorption Band. I. A Census of Substellar and Planetary-mass Objects
Da Rio, Nicola; Gennaro, Mario; Pacifici, Camilla +15 more
In order to obtain a complete census of the stellar and substellar population, down to a few ${M}_{\mathrm{Jup}}$ in the ∼1 Myr old Orion Nebula Cluster, we used the infrared channel of the Wide Field Camera 3 of the Hubble Space Telescope with the F139M and F130N filters. These bandpasses correspond to the 1.4 µm H2O absorption f…
Morphological Reconstruction of a Small Transient Observed by Parker Solar Probe on 2018 November 5
Stenborg, Guillermo; Howard, Russell A.; Hess, Phillip +2 more
On 2018 November 5, about 24 hr before the first close perihelion passage of Parker Solar Probe (PSP), a coronal mass ejection (CME) entered the field of view of the inner detector of the Wide-field Imager for Solar PRobe (WISPR) instrument on board PSP, with the northward component of its trajectory carrying the leading edge of the CME off the to…
The role of small-scale surface motions in the transfer of twist to a solar jet from a remote stable flux rope
Aulanier, Guillaume; Schmieder, Brigitte; Joshi, Reetika +2 more
Context. Jets often have a helical structure containing ejected plasma that is both hot and also cooler and denser than the corona. Various mechanisms have been proposed to explain how jets are triggered, primarily attributed to a magnetic reconnection between the emergence of magnetic flux and environment or that of twisted photospheric motions t…
ISA, a High Sensitivity Accelerometer in the Interplanetary Space
Lucente, Marco; Lefevre, Carlo; Fiorenza, Emiliano +6 more
ISA (Italian Spring Accelerometer) is a high sensitivity accelerometer flying, as scientific payload, on-board one of the two spacecraft (the Mercury Planetary Orbiter) of BepiColombo, the first ESA mission to Mercury. The first commissioning phase (performed in the period November 2018 - August 2019) allowed to verify the functionality of the ins…
REQUIEM-2D Methodology: Spatially Resolved Stellar Populations of Massive Lensed Quiescent Galaxies from Hubble Space Telescope 2D Grism Spectroscopy
Mahler, Guillaume; Bezanson, Rachel; Brammer, Gabriel +13 more
We present a novel Bayesian methodology to jointly model photometry and deep Hubble Space Telescope 2D grism spectroscopy of high-redshift galaxies. Our requiem2d code measures both unresolved and resolved stellar populations, ages, and star formation histories (SFHs) for the ongoing REsolving QUIEscent Magnified (REQUIEM) Galaxies Survey, which t…
Interplanetary Protons versus Interacting Protons in the 2017 September 10 Solar Eruptive Event
Jin, Meng; Heber, Bernd; Vainio, Rami +11 more
We analyze the relativistic proton emission from the Sun during the eruptive event on 2017 September 10, which caused a ground-level enhancement (GLE 72) registered by the worldwide network of neutron monitors. Using the neutron monitor data and interplanetary transport modeling both along and across interplanetary magnetic field (IMF) lines, we d…
Supercatastrophic Disruption of Asteroids in the Context of SOHO Comet, Fireball, and Meteor Observations
Ye, Quanzhi; Brown, Peter; Clark, David +5 more
Granvik et al. reported an absence of asteroids on orbits with perihelia near the Sun that they attribute to the "supercatastrophic disruption" of these bodies. Here we investigate whether there is evidence for this process among other bodies with similarly low perihelia: near-Earth asteroids, Solar and Heliospheric Observatory (SOHO) comets, and …
Experimental Investigation of Oxidation of Pyroxene and Basalt: Implications for Spectroscopic Analyses of the Surface of Venus and the Ages of Lava Flows
Filiberto, J.; Cutler, K. S.; Treiman, A. H. +1 more
Alteration of basalt on the surface of Venus should be dominated by nanophase hematite and sulfate coatings, but the timescale of oxidation and how that affects spectroscopic measurements has not been extensively studied. The oxidation rate and the effect on reflectance spectroscopy are needed to constrain the age of lava flows with high emissivit…
Progenitor properties of type II supernovae: fitting to hydrodynamical models using Markov chain Monte Carlo methods
González-Gaitán, S.; Folatelli, G.; Anderson, J. P. +3 more
Context. The progenitor and explosion properties of type II supernovae (SNe II) are fundamental to understanding the evolution of massive stars. Particular attention has been paid to the initial masses of their progenitors, but despite the efforts made, the range of initial masses is still uncertain. Direct imaging of progenitors in pre-explosion …
Hard X-Ray Emission from an Activated Flux Rope and Subsequent Evolution of an Eruptive Long-duration Solar Flare
Joshi, Bhuwan; Veronig, Astrid M.; Yurchyshyn, V. +2 more
In this paper, we present a comprehensive study of the evolutionary phases of a major M6.6 long duration event with special emphasize on its pre-flare phase. The event occurred in NOAA 12371 on 2015 June 22. A remarkable aspect of the event was an active pre-flare phase lasting for about an hour during which a hot EUV coronal channel was in the bu…