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Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Alonso, R.; Deeg, H.; Erikson, A. +51 more
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M⋆ = 1.00 ± 0.03 M⊙ and R⋆ = 1.09 ± 0.03 R⊙…
Mapping the stability of stellar rotating spheres via linear response theory
Pichon, C.; Heggie, D. C.; Varri, A. L. +3 more
Rotation is ubiquitous in the Universe, and recent kinematic surveys have shown that early-type galaxies and globular clusters are no exception. Yet the linear response of spheroidal rotating stellar systems has seldom been studied. This paper takes a step in this direction by considering the behaviour of spherically symmetric systems with differe…
The tilt of the velocity ellipsoid in the Milky Way with Gaia DR2
Helmi, A.; de Zeeuw, P. T.; Posti, L. +1 more
The velocity distribution of stars is a sensitive probe of the gravitational potential of the Galaxy, and hence of its dark matter distribution. In particular, the shape of the dark halo (e.g. spherical, oblate, or prolate) determines velocity correlations, and different halo geometries are expected to result in measurable differences. Here we exp…
Kinematics of the O VI Circumgalactic Medium: Halo Mass Dependence and Outflow Signatures
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
We probe the high-ionization circumgalactic medium by examining absorber kinematics, absorber-galaxy kinematics, and average absorption profiles of 31 O VI absorbers from the “Multiphase Galaxy Halos” Survey as a function of halo mass, redshift, inclination, and azimuthal angle. The galaxies are isolated at 0.12 < z gal < 0.66 and…
Inversion of asteroid photometry from Gaia DR2 and the Lowell Observatory photometric database
Hanuš, J.; Ďurech, J.; Vančo, R.
Context. Rotation properties (spin-axis direction and rotation period) and coarse shape models of asteroids can be reconstructed from their disk-integrated brightness when measured from various viewing geometries. These physical properties are essential for creating a global picture of structure and dynamical evolution of the main belt.
Aims:…
The Random Transiter - EPIC 249706694/HD 139139
Dai, F.; Vanderburg, A.; Jenkins, J. M. +16 more
We have identified a star, EPIC 249706694 (HD 139139), that was observed during K2 Campaign 15 with the Kepler extended mission that appears to exhibit 28 transit-like events over the course of the 87-d observation. The unusual aspect of these dips, all but two of which have depths of 200 ± 80 ppm, is that they exhibit no periodicity, and their ar…
Changes in Solar Rotation over Two Solar Cycles
Basu, Sarbani; Antia, H. M.
We use helioseismic data from ground- and space-based instruments to analyze how solar rotation has changed since the beginning of solar Cycle 23 with emphasis on studying the differences between Cycles 23 and 24. We find that the nature of solar rotation is indeed different for the two cycles. While the changes in the latitudinally independent co…
The complex case of MACS J0717.5+3745 and its extended filament: intra-cluster light, galaxy luminosity function, and galaxy orientations
Adami, C.; Martinet, N.; Durret, F. +3 more
Context. The properties of galaxies are known to be affected by their environment, but although galaxies in clusters and groups have been quite thoroughly investigated, little is known about galaxies belonging to filaments of the cosmic web, or about the properties of the filaments themselves.
Aims: Here we investigate the properties of the r…
Low-frequency X-ray timing with Gaussian processes and reverberation in the radio-loud AGN 3C 120
Wilkins, D. R.
A framework is developed to perform Fourier-domain timing analysis on X-ray light curves with gaps, employing Gaussian processes to model the probability distribution underlying the observed time series from which continuous samples can be drawn. A technique is developed to measure X-ray reverberation from the inner regions of accretion discs arou…
Noncircular Motions in the Outer Perseus Spiral Arm
Menten, Karl M.; Reid, Mark J.; Sakai, Nobuyuki +2 more
We report measurements of parallax and proper motion for five 6.7 GHz methanol maser sources in the outer regions of the Perseus arm as part of the BeSSeL Survey of the Galaxy. By combining our results with previous astrometric results, we determine an average spiral arm pitch angle of 9.°2 ± 1.°5 and an arm width of 0.39 kpc for this spiral arm. …