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The five axes of the Turtle: symmetry and asymmetry in NGC 6210
López, J. A.; Henney, William J.; García-Díaz, Ma T. +1 more
We carry out a comprehensive kinematic and morphological study of the asymmetrical planetary nebula: NGC 6210, known as the Turtle. The nebula's spectacularly chaotic appearance has led to proposals that it was shaped by mass transfer in a triple star system. We study the three-dimensional structure and kinematics of its shells, lobes, knots, and …
INTEGRAL discovery of a high-energy tail in the microquasar Cygnus X-3
Rodriguez, J.; Wilms, J.; Laurent, P. +3 more
Context. The X-ray spectra of X-ray binaries are dominated by emission of either soft or hard X-rays which defines their soft and hard spectral states. While the generic picture is relatively well understood, little is known about the interplay of the various media at work, or about the reasons why some sources do not follow common behavior. Cygnu…
A Possible Kilonova Powered by Magnetic Wind from a Newborn Black Hole
Liu, Yu; Zhang, Bin-Bin; Lü, Hou-Jun +4 more
The merger of binary neutron stars (NS-NS) as the progenitor of short gamma-ray bursts (GRBs) has been confirmed by the discovery of the association of the gravitational-wave (GW) event GW170817 with GRB 170817A. However, the merger product of binary NS remains an open question. An X-ray plateau followed by a steep decay ("internal plateau") has b…
Broadened profiles of diffuse interstellar bands
Krełowski, J.; Galazutdinov, G. A.; Siebenmorgen, R. +3 more
The paper describes profile broadening and peak wavelength variation of diffuse interstellar bands (DIBs) measured for 46 lines of sight, probably caused by the physical properties of intervening clouds. The full width at half-maximum of four studied DIBs (5780, 5797, 6196 and 6614 Å) demonstrates strong variability, sometimes doubling the widths …
The Wave Origins of Longitudinal Structures in ExoMars Trace Gas Orbiter (TGO) Aerobraking Densities
González-Galindo, Francisco; Forget, Francois; Forbes, Jeffrey M. +4 more
The nature and origins of longitudinal density structures in Mars' thermosphere between 100 and 120 km altitude, and -30° and -75° latitude around winter solstice (Ls = 70-122°), as measured by the accelerometer on the ExoMars Trace Gas Orbiter (TGO) Mission, are investigated. The methodology consists of deducing the responsible waves by comparing…
The aftermath of nova Centauri 2013 (V1369 Centauri)
Howell, Steve B.; Shore, Steven N.; Kuin, Paul +3 more
Context. Classical nova progenitors are cataclysmic variables and very old novae are observed to match systems with high mass transfer rates and (relatively) long orbital periods. However, the aftermath of a classical nova has never been studied in detail.
Aims: We intend to probe the aftermath of a classical nova explosion in cataclysmic var…
Fast outflows in protoplanetary nebulae and young planetary nebulae observed by Herschel/HIFI
Teyssier, D.; García-Lario, P.; Alcolea, J. +4 more
Context. Fast outflows and their interaction with slow shells (generally known as the fossil circumstellar envelope of asymptotic giant branch stars) play an important role in the structure and kinematics of protoplanetary and planetary nebulae (pPNe, PNe). To properly study their effects within these objects, we also need to observe the intermedi…
BG Tri: an example of a low-inclination RW Sex-type nova-like
Gänsicke, B. T.; Steeghs, D.; Rodríguez-Gil, P. +4 more
We analyse a wealth of optical spectroscopic and photometric observations of the bright (V = 11.9) cataclysmic variable BG Tri. The Gaia DR2 parallax gives a distance d = 334(8) pc to the source, making the object one of the intrinsically brightest nova-like variables seen under a low orbital inclination angle. Time-resolved spectroscopic observat…
Gravity Wave Packets in the Venusian Atmosphere Observed by Radio Occultation Experiments: Comparison With Saturation Theory
Tellmann, Silvia; Pätzold, Martin; Mori, Ryota +3 more
The characteristics of gravity wave packets in the Venusian atmosphere were studied using high-vertical-resolution temperature profiles obtained by ESA's Venus Express and JAXA's Akatsuki radio occultation experiments with radio holographic methods. Localized disturbances were detected by applying a wavelet transform to the temperature profiles. T…
Emission line galaxies in the SHARDS Frontier Fields - I. Candidate selection and the discovery of bursty Hα emitters
Pérez-González, Pablo G.; Conselice, Christopher J.; Ferreira, Leonardo +7 more
Emission line galaxies provide a crucial tool for the study of galaxy formation and evolution, providing a means to trace a galaxy's star formation history or metal enrichment, and to identify galaxies at a range of stellar masses. In this paper, we present a study of emission line galaxies in the Survey for High-z Absorption Red and Dead Sources …