Search Publications
Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
Pallé, E.; Zhang, H.; Winn, J. N. +31 more
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from the TESS mission, and was confirmed via additional photometric and spectroscopic observations, includin…
A clustering (DBSCAN+GMM) investigation of the young open cluster NGC 6649
Gao, Xinhua
We investigate the spatial structure and dynamical properties of the young (~60 Myr), richly populated open cluster NGC 6649 based on reliable cluster members from Gaia-DR3 data. The density-based spatial clustering of applications with noise is used to estimate membership probabilities for 25045 sample stars in the field of the cluster. More than…
New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM
Pichon, C.; Dubois, Y.; Kaviraj, S. +8 more
We introduce a new concept - termed 'planarity' - which aims to quantify planar structure in galaxy satellite systems without recourse to the number or thickness of planes. We use positions and velocities from the Gaia EDR3 to measure planarity in Milky Way (MW) satellites and the extent to which planes within the MW system are kinematically suppo…
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,…
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 …
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…
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…
Stellar rotations and the disentanglement of the Galactic thin and thick discs
da Silva, M. P.; Alves-Brito, A.; do Nascimento, J. D.
The kinematics, mean α-elements, and ages of the stars reveal two distinct disc populations observed in the Solar neighbourhood. Although several studies have been carried out to characterize abundances of chemical elements and kinematic identifications in these populations, there are few studies that dealt with the analysis of stellar rotation an…