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Detection of tidal tails around the open cluster M 67 using principal component analysis
Gao, Xinhua
In this paper we present an investigation of tidal tails around the old open cluster M 67 using Gaia-DR2. We identify likely extra-tidal stars around M 67 using principal component analysis (PCA) and a Gaussian mixture model (GMM). We find 1618 stars closely related to M 67, 85 of which are likely extra-tidal stars. We find clear evidence for the …
Is Fornax 4 the nuclear star cluster of the Fornax dwarf spheroidal galaxy?
Martocchia, S.; Dalessandro, E.; Salaris, M. +2 more
Fornax 4 is the most distinctive globular cluster in the Fornax dwarf spheroidal. Located close to the centre of the galaxy, more metal-rich and potentially younger than its four companions (namely, Fornax clusters number 1, 2, 3, and 5), it has been suggested to have experienced a different formation than the other clusters in the galaxy. Here, w…
Searching the Entirety of Kepler Data. I. 17 New Planet Candidates Including One Habitable Zone World
Kunimoto, Michelle; Ngo, Henry; Matthews, Jaymie M.
We present the results of an independent search of all ∼200,000 stars observed over the four year Kepler mission (Q1-Q17) for multiplanet systems, using a three-transit minimum detection criterion to search orbital periods up to hundreds of days. We incorporate both automated and manual triage, and provide estimates of the completeness and reliabi…
Spatiotemporal evolution, mineralogical composition, and transport mechanisms of long-runout landslides in Valles Marineris, Mars
Ehlmann, Bethany L.; Yin, An; Watkins, Jessica A.
Long-runout landslides with transport distances of >50 km are ubiquitous in Valles Marineris (VM), yet the transport mechanisms remain poorly understood. Four decades of studies reveal significant variation in landslide morphology and emplacement age, but how these variations are related to landslide transport mechanisms is not clear. In this s…
Tectono-Magmatic, Sedimentary, and Hydrothermal History of Arsinoes and Pyrrhae Chaos, Mars
Altieri, Francesca; Rossi, Angelo Pio; Carli, Cristian +1 more
Arsinoes and Pyrrhae Chaos are two adjacent chaotic terrains located east of Valles Marineris and west of Arabia Terra, on Mars. In this work, we produced a morpho-stratigraphic map of the area, characterized by a volcanic bedrock disrupted into polygonal mesas and knobs (Chaotic Terrain Unit) and two nondisrupted units. The latter present a spect…
Deriving star cluster parameters with convolutional neural networks. II. Extinction and cluster-background classification
Narbutis, D.; Bialopetravičius, J.
Context. Convolutional neural networks (CNNs) have been established as the go-to method for fast object detection and classification of natural images. This opens the door for astrophysical parameter inference on the exponentially increasing amount of sky survey data. Until now, star cluster analysis was based on integral or resolved stellar photo…
The disruption of the low-mass globular cluster E 3
Carballo-Bello, Julio A.; Piatti, Andrés E.; Salinas, Ricardo
We use Gaia DR2 photometry and proper motions to search for the hypothetical tidal tails of the Galactic globular cluster E 3. Using a modified version of a classical decontamination procedure, we are able to identify the presence of an extended structure emerging from the cluster up to r ∼ 1 deg from its centre, thus suggesting that this poorly s…
INTEGRAL view of AGN
Pian, Elena; Sazonov, Sergey; Bassani, Loredana +5 more
AGN are among the most energetic phenomena in the Universe and in the last two decades INTEGRAL's contribution in their study has had a significant impact. Thanks to the INTEGRAL extragalactic sky surveys, all classes of soft X-ray detected (in the 2-10 keV band) AGN have been observed at higher energies as well. Up to now, around 450 AGN have bee…
Accretion and Intercycle Variations in the PMS Interacting Binary AK Sco
France, Kevin; Gómez de Castro, Ana I.; Vallejo, Juan Carlos +2 more
There are only a handful of known short-period pre-main-sequence spectroscopic binaries with significant accretion rates (Class II sources). AK Sco stands out in this list because the system is composed of two equal mass F5 stars in a highly eccentric orbit thus both stars get as close as 11 stellar radii at periastron passage. This configuration …
Optical properties of cometary particles collected by COSIMA: Assessing the differences between microscopic and macroscopic scales
Langevin, Y.; Schulz, R.; Hilchenbach, M. +6 more
The COSIMA mass spectrometer on-board Rosetta was equipped with an optical microscope, Cosiscope, which identified several 10,000 cometary particles collected on targets exposed during the orbital phase around the nucleus of comet 67P Churyumov-Gerasimenko. The median value of reflectance factors evaluated from Cosiscope images for large collected…