Search Publications
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…
First detection and modelling of spatially resolved Lyα in TW Hya
Herczeg, Gregory J.; Bergin, Edwin A.; Gronke, Max +2 more
Lyman-α (Lyα) is the strongest emission line in the accretion-generated ultraviolet spectra from T Tauri stars and, as such, plays a critical role in regulating chemistry within the surrounding protoplanetary discs. Due to its resonant nature, the scattering of Lyα photons along the line of sight encodes information about the physical properties o…
Probing the Nature of Rotation in the Pleiades, Alpha Persei, and Hyades Clusters
Hao, C. J.; Xu, Y.; Hou, L. G. +5 more
Unraveling the internal kinematics of open clusters is crucial for understanding their formation and evolution. However, there is a dearth of research on this topic, primarily due to the lack of high-quality kinematic data. Using the exquisite-precision astrometric parameters and radial velocities provided by Gaia data release 3, we investigate th…
Towards a complete census of luminous Compton-thick active galactic nuclei in the Local Universe
Georgantopoulos, I.; Gandhi, P.; Akylas, A. +2 more
X-ray surveys provide the most efficient means for the detection of active galactic nuclei (AGNs). However, they do face difficulties in detecting the most heavily obscured Compton-thick AGNs. The BAT detector on board the Gehrels/Swift mission, operating in the very hard 14–195 keV band, has provided the largest samples of Compton-thick AGN in th…