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Molecules with ALMA at Planet-forming Scales (MAPS). XVI. Characterizing the Impact of the Molecular Wind on the Evolution of the HD 163296 System
Zhang, Ke; Wilner, David J.; Ménard, François +27 more
During the main phase of evolution of a protoplanetary disk, accretion regulates the inner-disk properties, such as the temperature and mass distribution, and in turn, the physical conditions associated with planet formation. The driving mechanism behind accretion remains uncertain; however, one promising mechanism is the removal of a fraction of …
Abundance Patterns of α and Neutron-capture Elements in the Helmi Stream
Chiappini, Cristina; Limberg, Guilherme; Rossi, Silvia +6 more
We identified eight additional stars as members of the Helmi stream (HStr) in the combined GALAH+ DR3 and Gaia EDR3 catalog. By consistently reevaluating claimed members from the literature, we consolidate a sample of 22 HStr stars with parameters determined from high-resolution spectroscopy and spanning a considerably wider (by ∼0.5 dex) metallic…
Alfvénic Perturbations in a Sunspot Chromosphere Linked to Fractionated Plasma in the Corona
Stangalini, Marco; Brooks, David H.; Baker, Deborah +7 more
In this study, we investigate the spatial distribution of highly varying plasma composition around one of the largest sunspots of solar cycle 24. Observations of the photosphere, chromosphere, and corona are brought together with magnetic field modeling of the sunspot in order to probe the conditions that regulate the degree of plasma fractionatio…
CoBiToM project - I. Contact binaries towards merging
Hakala, P.; Liakos, A.; Zola, S. +6 more
Binary and multiple stellar systems are numerous in our solar neighbourhood with 80 per cent of the solar-type stars being members of systems with high order multiplicity. The Contact Binaries Towards Merging (CoBiToM) Project is a programme that focuses on contact binaries and multiple stellar systems, as a key for understanding stellar nature. T…
The IRX-β relation of high-redshift galaxies
Faucher-Giguère, Claude-André; Hayward, Christopher C.; Narayanan, Desika +5 more
The relation between infrared excess (IRX) and UV spectral slope (βUV) is an empirical probe of dust properties of galaxies. The shape, scatter, and redshift evolution of this relation are not well understood, however, leading to uncertainties in estimating the dust content and star formation rates (SFRs) of galaxies at high redshift. I…
A Solar System formation analogue in the Ophiuchus star-forming complex
Alves, João; Lin, Douglas N. C.; Forbes, John C.
Anomalies among the daughter nuclei of the extinct short-lived radionuclides in calcium-aluminium-rich inclusions indicate that the Solar System must have been born near a source of the short-lived radionuclides so that they could be incorporated before they decayed away1. γ-rays from one such living short-lived radionuclide, 26
Gaia search for stellar companions of TESS Objects of Interest II
Mugrauer, Markus; Michel, Kai-Uwe
We present the latest results of our ongoing multiplicity study of (Community) TESS Objects of Interest, using astro- and photometric data from the ESA-Gaia mission, to detect stellar companions of these stars and to characterize their properties. In total, 107 binary, 5 hierarchical triple star systems, as well as one quadruple system were detect…
Assessing the Predictability of Solar Energetic Particles with the Use of Machine Learning Techniques
Lavasa, E.; Giannopoulos, G.; Papaioannou, A. +5 more
A consistent approach for the inherently imbalanced problem of solar energetic particle (SEP) events binary prediction is being presented. This is based on solar flare and coronal mass ejection (CME) data and combinations of both thereof. We exploit several machine learning (ML) and conventional statistics techniques to predict SEPs. The methods u…
Small Volcanic Vents of the Tharsis Volcanic Province, Mars
Richardson, J. A.; Bleacher, J. E.; Connor, C. B. +1 more
Distributed style volcanism is an end member of terrestrial volcanism that produces clusters of small volcanoes when isolated magma bodies ascend from broad magma source regions. Volcano clusters can develop over millions of years, one volcano at a time, and can be used to infer unobserved geologic phenomena, including subsurface stresses and crac…
The star cluster age function in the Galactic disc with Gaia DR2. Fewer old clusters and a low cluster formation efficiency
Cantat-Gaudin, Tristan; Gieles, Mark; Anders, Friedrich +4 more
We perform a systematic reanalysis of the age distribution of Galactic open star clusters. Using a catalogue of homogeneously determined ages for 834 open clusters contained in a 2 kpc cylinder around the Sun and characterised with astrometric and photometric data from the Gaia satellite, we find that it is necessary to revise earlier works that r…