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A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey - indications of a non-prevailing site for light r-process elements
Beers, Timothy C.; Sivarani, Thirupathi; Ezzeddine, Rana +5 more
We present a comprehensive analysis of the detailed chemical abundances for a sample of 11 metal-poor, very metal-poor, and extremely metal-poor stars ([Fe/H] = -1.65 to [Fe/H] = -3.0) as part of the HESP-GOMPA (Galactic survey Of Metal Poor stArs) survey. The abundance determinations encompass a range of elements, including C, Na, Mg, Al, Si, Ca,…
Strong-lensing and kinematic analysis of CASSOWARY 31: Can strong lensing constrain the masses of multi-plane lenses?
Grillo, C.; Wang, H.; Christensen, L. +4 more
We present a mass measurement for the secondary lens along the line of sight (LoS) from the multi-plane strong lens modeling of the group-scale lens CASSOWARY 31 (CSWA 31). The secondary lens at redshift z = 1.49 is a spiral galaxy well aligned along the LoS with the main lens at z = 0.683. Using the MUSE integral-field spectroscopy of this spiral…
Protoplanetary and debris disks in the η Chamaeleontis Association. A submillimeter survey obtained with APEX/LABOCA observations
Wolf, S.; Henning, Th.; Lawson, W. A. +7 more
Context. Nearby associations are ideal regions to study coeval samples of protoplanetary and debris disks down to late M-type stars. Those aged 5-10 Myr, where most of the disk should have already dissipated forming planets, are of particular interest.
Aims: We present the first complete study of both protoplanetary and debris disks in a youn…
Modelling molecular clouds and CO excitation in AGN-host galaxies
Vallini, Livia; Mingozzi, Matilde; Alonso-Herrero, Almudena +9 more
We present a new physically motivated model for estimating the molecular line emission in active galaxies. The model takes into account (i) the internal density structure of giant molecular clouds (GMCs), (ii) the heating associated with both stars and the active galactic nuclei (AGNs), respectively, producing photodissociation regions (PDRs) and …
Ba Enrichment in Gaia MS+WD Binaries: Tracing s-process Element Production
Hallakoun, Na'ama; Toonen, Silvia; Rix, Hans-Walter +3 more
A large population of intermediate-separation binaries, consisting of a main-sequence (MS) star and a white dwarf (WD), recently emerged from Gaia's third data release (DR3), posing challenges to current models of binary evolution. Here we examine the s-process element abundances in these systems using data from GALAH DR3. Following refined sample…
The DECam Ecliptic Exploration Project (DEEP). VII. The Strengths of Three Superfast Rotating Main-belt Asteroids from a Preliminary Search of DEEP Data
Adams, Fred C.; Valdes, Francisco; Jurić, Mario +19 more
Superfast rotators (SFRs) are small solar system objects that rotate faster than generally possible for a cohesionless rubble pile. Their rotational characteristics allow us to make inferences about their interior structure and composition. Here, we present the methods and results from a preliminary search for SFRs in the DECam Ecliptic Exploratio…
Characterising the contribution of dust-obscured star formation at z ≳ 5 using 18 serendipitously identified [C II] emitters
Inami, H.; Bowler, R. A. A.; Walter, F. +24 more
We present a new method to determine the star formation rate density (SFRD) of the Universe at
Detection and characterization of icy cavities on the nucleus of comet 67P/Churyumov-Gerasimenko
Lamy, Philippe; Groussin, Olivier; Faury, Guillaume +1 more
We report on the detection of three icy cavities on the nucleus of comet 67P/Churyumov-Gerasimenko. They were identified on high-resolution anaglyphs built from images acquired by the Optical, Spectroscopic, and Infrared Remote Imaging System instrument aboard the Rosetta spacecraft on 2016 April 9 and 10. Visually, they appear as bright patches o…
Galactic-Seismology Substructures and Streams Hunter with LAMOST and Gaia. I. Methodology and Local Halo Results
Ting, Yuan-Sen; Bland-Hawthorn, Joss; Wang, Hai-Feng +4 more
We present a novel, deep-learning-based method—dubbed Galactic-Seismology Substructures and Streams Hunter, or GS3 Hunter for short—to search for substructures and streams in stellar kinematics data. GS3 Hunter relies on a combined application of Siamese neural networks to transform the phase space information and the K-means…
Simultaneous multicolour transit photometry of hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b
Tamura, M.; Pallé, E.; Korth, J. +28 more
Accurate physical parameters of exoplanet systems are essential for further exploration of planetary internal structure, atmospheres, and formation history. We aim to use simultaneous multicolour transit photometry to improve the estimation of transit parameters, to search for transit timing variations (TTVs), and to establish which of our targets…