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The composition and structure of Enceladus' plume from the complete set of Cassini UVIS occultation observations
Hansen, C. J.; Hendrix, A. R.; West, R. A. +4 more
Observations acquired at ultraviolet wavelengths are uniquely well-suited to investigate the composition and structure of Enceladus' plume. This paper describes the observations, analysis techniques and results of all the Enceladus occultations observed by Cassini's Ultraviolet Imaging Spectrograph (UVIS) and other observations designed to study t…
Estimation of the Physical Parameters of a CME at High Coronal Heights Using Low-frequency Radio Observations
Vourlidas, Angelos; Mondal, Surajit; Oberoi, Divya
Measuring the physical parameters of coronal mass ejections (CMEs), particularly their entrained magnetic field, is crucial for understanding their physics and for assessing their geoeffectiveness. At the moment, only remote sensing techniques can probe these quantities in the corona, the region where CMEs form and acquire their defining character…
Dynamical Evidence of a Spiral Arm-driving Planet in the MWC 758 Protoplanetary Disk
Debes, John H.; Schneider, Glenn; Esposito, Thomas M. +22 more
More than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses—companion-disk interaction and gravitational instability (GI)—predict distinct motion for spirals. By imaging the MWC 758 spiral arm system at two epochs spanning ∼5 yr using …
Evidence for metallicity-dependent spin evolution in the Kepler field
Amard, Louis; Roquette, Julia; Matt, Sean P.
A curious rotation period distribution in the colour-magnitude-period diagram (CMPD) of the Kepler field was recently revealed, thanks to data from Gaia and Kepler spacecraft. It was found that redder and brighter stars are spinning slower than the rest of the main sequence. On the theoretical side, it was demonstrated that metallicity should affe…
A significant mutual inclination between the planets within the π Mensae system
De Rosa, Robert J.; Nielsen, Eric L.; Dawson, Rebekah
Context. Measuring the geometry of multi-planet extrasolar systems can provide insight into their dynamical history and the processes of planetary formation. These types of measurements are challenging for systems that are detected through indirect techniques such as radial velocity and transit, having only been measured for a handful of systems t…
Discovery of six new strongly magnetic white dwarfs in the 20 pc local population
Landstreet, John D.; Bagnulo, Stefano
The sample of white dwarfs included in the local 20 pc volume documents, fairly accurately, the total production of white dwarfs over roughly 10 Gyr of stellar evolution in this part of the Milky Way Galaxy. In this sample, we have been systematically searching for magnetic white dwarfs. Here we report the discovery of six new magnetic white dwarf…
A Deep View into the Nucleus of the Sagittarius Dwarf Spheroidal Galaxy with MUSE. II. Kinematic Characterization of the Stellar Populations
Mastrobuono-Battisti, A.; Kacharov, N.; Böker, T. +9 more
The Sagittarius dwarf spheroidal galaxy is in an advanced stage of disruption but still hosts its nuclear star cluster (NSC), M54, at its center. In this paper, we present a detailed kinematic characterization of the three stellar populations present in M54: young metal-rich (YMR); intermediate-age metal-rich (IMR); and old metal-poor (OMP), based…
Modeling of the Variable Circumstellar Absorption Features of WD 1145+017
Xu, S.; Dufour, P.; Fortin-Archambault, M.
We present an eccentric precessing gas disk model designed to study the variable circumstellar absorption features detected for WD 1145+017, a metal polluted white dwarf with an actively disintegrating asteroid around it. This model, inspired by one recently proposed by Cauley et al., calculates explicitly the gas opacity for any predetermined phy…
The CARMENES search for exoplanets around M dwarfs. Convective shift and starspot constraints from chromatic radial velocities
Amado, P. J.; Bauer, F. F.; Caballero, J. A. +26 more
Context. Variability caused by stellar activity represents a challenge to the discovery and characterization of terrestrial exoplanets and complicates the interpretation of atmospheric planetary signals.
Aims: We aim to use a detailed modeling tool to reproduce the effect of active regions on radial velocity measurements, which aids the ident…
TESS observations of Be stars: a new interpretation
Balona, L. A.; Ozuyar, D.
Light curves of 57 classical Be stars in TESS sectors 1-15 are examined. In most Be stars, the periodogram shows groups at a fundamental and one or more harmonics, which we attribute to rotation. In about 40 per cent of the stars, the group is just a single narrow or slightly broadened peak. In about 30 per cent, it consists of a multiple, closely…