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Evolution of a Long-Duration Coronal Mass Ejection and Its Sheath Region Between Mercury and Earth on 9-14 July 2013
Farrugia, C. J.; Lugaz, N.; Winslow, R. M.
Using in situ measurements and remote-sensing observations, we study a coronal mass ejection (CME) that left the Sun on 9 July 2013 and impacted both Mercury and Earth while the planets were in radial alignment (within 3∘). The CME had an initial speed as measured by coronagraphs of 580 ± 20 km/s, an inferred speed at Mercury of 580 ± 30 km/s, and…
Detailed 3D structure of Orion A in dust with Gaia DR2
Bailer-Jones, Coryn A. L.; Soler, Juan D.; Rezaei Kh., Sara +1 more
The unprecedented astrometry from Gaia's second data release (DR2) provides us with an opportunity to study molecular clouds in the solar neighbourhood in detail. Extracting the wealth of information in these data remains a challenge, however. We have further improved our Gaussian-processes-based, three-dimensional dust mapping technique to allow …
Predicting accreted satellite galaxy masses and accretion redshifts based on globular cluster orbits in the E-MOSAICS simulations
Trujillo-Gomez, Sebastian; Crain, Robert A.; Kruijssen, J. M. D. +4 more
The ages and metallicities of globular clusters (GCs) are known to be powerful tracers of the properties of their progenitor galaxies, enabling their use in determining the merger histories of galaxies. However, while useful in separating GCs into individual accretion events, the orbits of GC groups themselves have received less attention as probe…
Simultaneous TESS and NGTS transit observations of WASP-166 b
Wheatley, Peter J.; Bayliss, Daniel; Casewell, Sarah L. +21 more
We observed a transit of WASP-166 b using nine Next Generation Transit Survey (NGTS) telescopes simultaneously with the Transiting Exoplanet Survey Satellite (TESS) observations of the same transit. We achieved a photometric precision of 152 ppm per 30 min with the nine NGTS telescopes combined, matching the precision reached by TESS for the trans…
20 Years of ACE Data: How Superposed Epoch Analyses Reveal Generic Features in Interplanetary CME Profiles
Auchère, F.; Démoulin, P.; Dasso, S. +4 more
Interplanetary coronal mass ejections (ICMEs) are magnetic structures propagating from the Sun's corona to the interplanetary medium. With over 20 years of observations at the L1 libration point, ACE offers hundreds of ICMEs detected at different times during several solar cycles and with different features such as the propagation speed. We invest…
Jet feedback and the photon underproduction crisis in SIMBA
Davé, Romeel; Christiansen, Jacob F.; Sorini, Daniele +1 more
We examine the impact of black hole jet feedback on the properties of the low-redshift intergalactic medium (IGM) in the SIMBA simulation, with a focus on the Lyα forest mean flux decrement DA. Without jet feedback, we confirm the photon underproduction crisis (PUC) in which ΓH I at $z$ = 0 must be increased by 6 times over t…
Dynamical orbital classification of selected N-rich stars with Gaia Data Release 2 astrometry
Fernández-Trincado, José G.; Ortigoza-Urdaneta, Mario; Moreno, Edmundo +4 more
We have used the galaxy modelling algorithm GRAVPOT16, to explore the most probable orbital elements of a sample of 64 selected N-rich stars across the Milky Way. We use the newly measured proper motions from Gaia Data Release 2 with existing line-of-sight velocities from the second generation of the Apache Point Observatory Galactic Evolution Exp…
TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS
Mitnyan, T.; Pál, A.; Klagyivik, P. +5 more
We report the discovery and complex analyses of the first two compact hierarchical triple star systems discovered with TESS in or near its southern continuous viewing zone during Year 1. Both TICs 167692429 and 220397947 were previously unknown eclipsing binaries, and the presence of a third companion star was inferred from eclipse timing variatio…
The µ Tau Association: A 60 Myr Old Coeval Group at 150 pc from the Sun
Mann, Andrew W.; Faherty, Jacqueline K.; Gagné, Jonathan +3 more
We present an analysis of the newly identified µ Tau Association (MUTA) of young stars at ≃150 pc from the Sun that is part of the large Cas-Tau structure, coeval and comoving with the α Persei cluster. This association is also located in the vicinity of the Taurus-Auriga star-forming region and the Pleiades association, although it is unrel…
Origin and Evolution of Cometary Nuclei
Blum, Jürgen; Morbidelli, Alessandro; Davidsson, Björn +1 more
One of the key goals of the Rosetta mission was to understand how, where and when comets formed in our solar system. There are two major hypotheses for the origin of comets, both pre-Rosetta: (1) hierarchical accretion of dust and ice grains in the Solar Nebula and (2) the growth of pebbles, which are then brought together by streaming instabiliti…