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Gaia18aen: First symbiotic star discovered by Gaia
Reichart, D. E.; Skowron, J.; Gromadzki, M. +20 more
Context. Besides the astrometric mission of the Gaia satellite, its repeated and high-precision measurements also serve as an all-sky photometric transient survey. The sudden brightenings of the sources are published as Gaia Photometric Science Alerts and are made publicly available, allowing the community to photometrically and spectroscopically …
SDSS J124043.01+671034.68: the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?
Kepler, S. O.; Raddi, Roberto; Gänsicke, Boris T. +2 more
The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal pulse or binary interactions has been suggested to explain this very unusual photospheric composition. We report the additional…
Multispectral surface emissivity from VIRTIS on Venus Express
Tsang, C. C. C.; Mueller, N. T.; Smrekar, S. E.
The surface composition of Venus is mostly inaccessible to remote observation due to the dense cloud cover. There are five spectral windows that show measurable thermal emission from the surface at night. The VIRTIS spectrometer on Venus Express observed three of these windows over much of the southern hemisphere of Venus. We use these data along …
Photometric and Spectroscopic Studies of Superoutbursts of Three Dwarf Novae Independently Identified by the SVOM/GWAC System in 2018
Zheng, W.; Filippenko, A. V.; Xu, Y. +27 more
We report our photometric and spectroscopic follow-up observations of the superoutbursts of three dwarf novae (DNe; GWAC 180415A, GWAC 181017A, and GWAC 181211A) identified independently by the Ground Wide-angle Cameras system, one of the ground-based instruments of the China-France SVOM mission. Based on a combination of our photometry and that t…
VLT/X-shooter spectroscopy of massive young stellar objects in the 30 Doradus region of the Large Magellanic Cloud
Kaper, L.; Sabbi, E.; de Mink, S. E. +13 more
The process of massive star (M ≥ 8 M⊙) formation is still poorly understood. Observations of massive young stellar objects (MYSOs) are challenging due to their rarity, short formation timescale, large distances, and high circumstellar extinction. Here, we present the results of a spectroscopic analysis of a population of MYSOs in the La…
Relations between Coronal Mass Ejections and the Photospheric Magnetic Field in Cycles 23 and 24
Bilenko, Irina A.
The number of coronal mass ejections (CMEs) and their parameters and cycle variations were investigated and compared to the photospheric magnetic field evolution in cycles 23 and 24. The Coordinated Data Analysis Workshops (CDAW) catalog of white-light CMEs detected by the Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagrap…
Cold gas and dust: Hunting spiral-like structures in early-type galaxies
Duc, P. -A.; Peletier, R. F.; Serra, P. +1 more
Context. Observations of neutral hydrogen (H I) and molecular gas show that 50% of all nearby early-type galaxies contain some cold gas. Molecular gas is always found in small gas discs in the central region of the galaxy, while neutral hydrogen is often distributed in a low-column density disc or ring typically extending well beyond the stellar b…
FEDReD. I. 3D extinction and stellar maps by Bayesian deconvolution
Arenou, F.; Babusiaux, C.; Hottier, C. +2 more
Context. While Gaia enables us to probe the extended local neighbourhood in great detail, the thin disc structure at larger distances remains sparsely explored.
Aims: We aim here to build a non-parametric 3D model of the thin disc structures handling both the extinction and the stellar density simultaneously.
Methods: We developed a Baye…
The absolute proper motions of the Arches and Quintuplet clusters
van der Marel, Roeland P.; Bellini, Andrea; Libralato, Mattia +2 more
Arches and Quintuplet are two young, massive clusters projected near the Galactic Centre. To date, studies focused on understanding their origin have been based on proper motions (PMs) derived in the clusters' reference frames and required some assumptions about their 3D motion. In this paper, we combine public PM catalogues of these clusters with…
Characterizing X-Ray Properties of the Gamma-Ray Pulsar PSR J1418-6058 in the Rabbit Pulsar Wind Nebula
An, Hongjun; Kim, Minjun
We report on X-ray studies of the gamma-ray pulsar PSR J1418-6058 in the Rabbit pulsar wind nebula (PWN) carried out using archival Chandra and XMM-Newton observations. A refined timing analysis performed with the 120 ks XMM-Newton data finds significant (p ≈ 10-7) pulsation at P ≈ 110 ms which is consistent with that measured with the …