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Space Velocity and Time Span of Jets in Planetary Nebulae
Guerrero, Martín A.; Ortiz, Roberto; Suzett Rechy-García, Jackeline
Fast highly collimated outflows, including bipolar knots, jetlike features, and point-symmetric filaments or strings of knots, are common in planetary nebulae (PNe). These features, generally known as jets, are thought to play an active role in the nebular shaping immediately before or while fast stellar winds and D-type ionization fronts shock an…
The influence of NLTE effects in Fe I lines on an inverted atmosphere. I. 6301 Å and 6302 Å lines formed in 1D NLTE
Solanki, S. K.; van Noort, M.; Smitha, H. N. +1 more
Context. Ultraviolet overionisation of iron atoms in the solar atmosphere leads to deviations in their level populations based on Saha-Boltzmann statistics. This causes their line profiles to form in non-local thermodynamic equilibrium (NLTE) conditions. When inverting such profiles to determine atmospheric parameters, the NLTE effects are often n…
Connecting 3D Evolution of Coronal Mass Ejections to Their Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Since coronal mass ejections (CMEs) are the major drivers of space weather, it is crucial to study their evolution starting from the inner corona. In this work we use graduated cylindrical shell model to study the 3D evolution of 59 CMEs in the inner (<3 R⊙) and outer (>3 R⊙) corona using observations from COR-1 and COR…
Search for Nearby Earth Analogs .III. Detection of 10 New Planets, 3 Planet Candidates, and Confirmation of 3 Planets around 11 Nearby M Dwarfs
Butler, R. Paul; Vogt, Steven S.; Holden, Bradford +10 more
Earth-sized planets in the habitable zones of M dwarfs are good candidates for the study of habitability and detection of biosignatures. To search for these planets, we analyze all available radial velocity data and apply four signal detection criteria to select the optimal candidates. We find 10 strong candidates satisfying these criteria and thr…
Spirals, shadows, and precession in HD 100453 - I. The orbit of the binary
Ménard, François; Pinte, Christophe; Maire, Anne-Lise +7 more
In recent years, several protoplanetary discs have been observed to exhibit spirals, both in scattered light and (sub)millimetre continuum data. The HD 100453 binary star system hosts such a disc around its primary. Previous work has argued that the spirals were caused by the gravitational interaction of the secondary, which was assumed to be on a…
Stellar Population Astrophysics (SPA) with TNG. The old open clusters Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171
Vallenari, A.; Sordo, R.; Bragaglia, A. +9 more
Context. Open clusters are excellent tracers of the chemical evolution of the Galactic disc. The spatial distribution of their elemental abundances, through the analysis of high-quality and high-resolution spectra, provides insight into the chemical evolution and mechanisms of element nucleosynthesis in regions characterised by different condition…
A comprehensive study of open clusters Czernik 14, Haffner 14, Haffner 17 and King 10 using multicolour photometry and Gaia DR2 astrometry
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +2 more
This paper presents an investigation into the four open clusters Czernik 14, Haffner 14, Haffner 17 and King 10, located near the Perseus arm of the Milky Way, using the Gaia DR2, 2MASS, WISE, APASS and Pan-STARRS1 data sets. We find normal interstellar extinction in 12 photometric bands for these clusters. Using Gaia DR2 proper motion data, the n…
Deep XMM-Newton Observations Reveal the Origin of Recombining Plasma in the Supernova Remnant W44
Seta, Masumichi; Yamaguchi, Hiroya; Uchida, Hiroyuki +8 more
Recent X-ray studies have revealed overionized recombining plasmas in a dozen mixed-morphology (MM) supernova remnants (SNRs). However, the physical process of the overionization has not yet been fully understood. Here we report on spatially resolved spectroscopy of X-ray emission from W44, one of the overionized MM SNRs, using XMM-Newton data fro…
High-resolution, 3D radiative transfer modelling. II. The early-type spiral galaxy M 81
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +14 more
Context. Interstellar dust absorbs stellar light very efficiently, thus shaping the energy output of galaxies. Studying the impact of different stellar populations on the dust heating continues to be a challenge because it requires decoupling the relative geometry of stars and dust and also involves complex processes such as scattering and non-loc…
Spirals inside the millimeter cavity of transition disk SR 21
Ménard, F.; Henning, T.; Ginski, C. +22 more
Context. Hydrodynamical simulations of planet-disk interactions suggest that planets may be responsible for a number of the substructures frequently observed in disks in both scattered light and dust thermal emission. Despite the ubiquity of these features, direct evidence of planets embedded in disks and of the specific interaction features like …