Search Publications
Evidence for differentiation of the most primitive small bodies
Jorda, L.; Lamy, P.; Colas, F. +41 more
Context. Dynamical models of Solar System evolution have suggested that the so-called P- and D-type volatile-rich asteroids formed in the outer Solar System beyond Neptune's orbit and may be genetically related to the Jupiter Trojans, comets, and small Kuiper belt objects (KBOs). Indeed, the spectral properties of P- and D-type asteroids resemble …
Exploiting White-Light Observations to Improve Estimates of Magnetic Connectivity
Poirier, Nicolas; Kouloumvakos, Athanasios; Rouillard, Alexis P. +7 more
TheSolar Orbiter(SolO) andParker Solar Probemissions have opened up new challenges for the heliospheric scientific community. Their proximity to the Sun and their high quality measurements allow us to investigate, for the first time, potential sources for the solar wind plasma measuredin situ. More accurate estimates of magnetic connectivities fro…
MOMO. IV. The Complete Swift X-Ray and UV/Optical Light Curve and Characteristic Variability of the Blazar OJ 287 during the Last Two Decades
Ciprini, S.; Komossa, S.; Gallo, L. C. +5 more
We have been carrying out a dense monitoring of the blazar OJ 287 with Swift since late 2015 as part of our project MOMO (Multiwavelength Observations and Modeling of OJ 287). This is the densest existing monitoring of OJ 287 involving X-ray/UV data. In this latest publication of a sequence, we characterize the multiwavelength variability of OJ 28…
Kinetic electrostatic waves and their association with current structures in the solar wind
Maksimovic, M.; Bale, S. D.; Chust, T. +21 more
Context. A variety of kinetic electrostatic and electromagnetic waves develop in the solar wind and the relationship between these waves and larger scale structures, such as current sheets and ongoing turbulence, remain a topic of investigation. Similarly, the instabilities producing ion-acoustic waves in the solar wind are still an open question.…
Massive White Dwarfs in Young Star Clusters
Caiazzo, Ilaria; Richer, Harvey B.; Heyl, Jeremy +6 more
We have carried out a search for massive white dwarfs (WDs) in the direction of young open star clusters using the Gaia DR2 database. The aim of this survey was (1) to provide robust data for new and previously known high-mass WDs regarding cluster membership, (2) to highlight WDs previously included in the initial final mass relation (IFMR) that …
Capturing transient plasma flows and jets in the solar corona
Peter, H.; Chitta, L. P.; Solanki, S. K. +8 more
Intensity bursts in ultraviolet (UV) to X-ray wavelengths and plasma jets are typical signatures of magnetic reconnection and the associated impulsive heating of the solar atmospheric plasma. To gain new insights into the process, high-cadence observations are required to capture the rapid response of plasma to magnetic reconnection as well as the…
Gaia EDR3 Proper Motions of Milky Way Dwarfs. II Velocities, Total Energy, and Angular Momentum
Hammer, Francois; Babusiaux, Carine; Bonifacio, Piercarlo +5 more
Here we show that precise Gaia EDR3 proper motions have provided robust estimates of 3D velocities, angular momentum, and total energy for 40 Milky Way dwarfs. The results are statistically robust and are independent of the Milky Way mass profile. Dwarfs do not behave like long-lived satellites of the Milky Way because of their excessively large v…
Forward Modeling of Solar Coronal Magnetic-field Measurements Based on a Magnetic-field-induced Transition in Fe X
Chen, Yajie; Tian, Hui; Deng, Yuanyong +6 more
It was recently proposed that the intensity ratios of several extreme ultraviolet spectral lines from Fe X ions can be used to measure the solar coronal magnetic field based on magnetic-field-induced transition (MIT) theory. To verify the suitability of this method, we performed forward modeling with a three-dimensional radiation magnetohydrodynam…
Ultra-steep-spectrum Radio "Jellyfish" Uncovered in A2877
Johnston-Hollitt, Melanie; Hodgson, Torrance; Bartalucci, Iacopo +3 more
We report on the discovery of a mysterious ultra-steep-spectrum (USS) synchrotron source in the galaxy cluster A2877. We have observed the source with the Murchison Widefield Array at five frequencies across 72-231 MHz and found the source to exhibit strong spectral curvature over this range, as well as the steepest known spectra of a synchrotron …
IGM transmission bias for z ≥ 2.9 Lyman continuum detected galaxies
Ryan-Weber, E. V.; Rafelski, M.; Bassett, R. +4 more
Understanding the relationship between the underlying escape fraction of Lyman continuum (LyC) photons (fesc) emitted by galaxies and measuring the distribution of observed fesc values at high redshift is fundamental to the interpretation of the reionization process. In this paper, we perform a statistical exploration of the …