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The first interferometric survey of massive YSOs in the K-band. Hot dust, ionised gas, and binarity at au scales
Mendigutía, I.; Stecklum, B.; de Wit, W. -J. +8 more
Context. Circumstellar discs are essential for the formation of high mass stars, while multiplicity, and in particular binarity, appears to be an inevitable outcome, as the vast majority of massive stars (>8 M⊙) are found in binaries (up to 100%). Our understanding of the innermost regions of accretion discs around massive stars and …
Predictions of Astrometric Jitter for Sun-like Stars. II. Dependence on Inclination, Metallicity, and Active-region Nesting
Solanki, S. K.; Shapiro, A. I.; Mints, A. +5 more
Ultra-precise astrometry from the Gaia mission is expected to lead to astrometric detections of more than 20,000 exoplanets in our Galaxy. One of the factors that could hamper such detections is the astrometric jitter caused by the magnetic activity of the planet host stars. In our previous study, we modeled astrometric jitter for the Sun observed…
First Detection and Thermal Characterization of Terminator CO2 Ice Clouds With ExoMars/NOMAD
Vandaele, Ann Carine; Stolzenbach, Aurélien; Aoki, Shohei +16 more
We present observations of terminator CO2 ice clouds events in three groups: Equatorial dawn, Equatorial dusk (both between 20°S and 20°N) and Southern midlatitudes at dawn (45°S and 55°S east of Hellas Basin) with ESA ExoMars Trace Gas Orbiter's Nadir and Occultation for MArs Discovery instrument. CO2 ice abundance is retrie…
MUSE-ALMA haloes VI: coupling atomic, ionized, and molecular gas kinematics of galaxies
Hamanowicz, Aleksandra; Péroux, Céline; Augustin, Ramona +7 more
We present results of MUSE-ALMA haloes, an ongoing study of the circumgalactic medium (CGM) of galaxies (z ≤ 1.4). Using multiphase observations we probe the neutral, ionized, and molecular gas in a subsample containing six absorbers and nine associated galaxies in the redshift range z ~ 0.3-0.75. Here, we give an in-depth analysis of the newly CO…
Timing argument take on the Milky Way and Andromeda past encounter
Benisty, David
The two-body problem of the M 31 and Milky Way (MW) galaxies with a cosmological constant background is studied, with an emphasis on the possibility that they experienced a past encounter (PE). Past encounters are possible only for a nonzero transverse velocity, and their viability is subject to observations of the imprints of such near collisions…
A faint companion around CrA-9: protoplanet or obscured binary?
Lodato, G.; Pinte, C.; Casassus, S. +16 more
Understanding how giant planets form requires observational input from directly imaged protoplanets. We used VLT/NACO and VLT/SPHERE to search for companions in the transition disc of 2MASS J19005804-3645048 (hereafter CrA-9), an accreting M0.75 dwarf with an estimated age of 1-2 Myr. We found a faint point source at ∼0.7-arcsec separation from Cr…
LOFAR Observations of a Jet-driven Piston Shock in the Low Solar Corona
Gallagher, Peter T.; Zucca, Pietro; Carley, Eoin P. +2 more
The Sun produces highly dynamic and eruptive events that can drive shocks through the corona. These shocks can accelerate electrons, which result in plasma emission in the form of a type II radio burst. Despite the large number of type II radio burst observations, the precise origin of coronal shocks is still subject to investigation. Here, we pre…
A SOPHIE RV search for giant planets around young nearby stars (YNS). A combination with the HARPS YNS survey
Meunier, N.; Messina, S.; Lagrange, A. -M. +9 more
Context. The search of close (a ≲ 5 au) giant planet (GP) companions with radial velocity (RV) around young stars and the estimate of their occurrence rates is important to constrain the migration timescales. Furthermore, this search will allow the giant planet occurrence rates to be computed at all separations via the combination with direct imag…
ATOMIUM: halide molecules around the S-type AGB star W Aquilae
Waters, L. B. F. M.; Menten, K. M.; Sahai, R. +36 more
Context. S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate but have not been studied in as much detail as their carbon- and oxygen-rich counterparts. W Aql is a nearby S-type star, with wel…
The sun as a significant agent provoking earthquakes
Preka-Papadema, P.; Mavromichalaki, H.; Anagnostopoulos, G. +3 more
In this paper we provide significant evidence that the sun is a principal agent provoking seismic activity. In particular the aim of the studies presented is to examine the possible relation of the coronal hole (CH) driven high speed solar wind streams (HSSs) with seismicity We performed several statistical studies of solar space and seismological…