Search Publications
An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21
Hu, Qingshun; Luo, Yangping; Li, Yuting +4 more
Utilizing Gaia data from the literature, we report a new young (∼8.9 Myr) cluster pair, ASCC 19 and ASCC 21, located near the Orion star-forming complex. The clusters are separated by a 3D distance of 27.00 ± 7.51 pc. Both clusters share a common age (Log(age) = 6.95 ± 0.05), similar radial velocities (RV = 21.34 ± 4.47 km s‑1 for ASCC …
GJ 2126 b: A highly eccentric Jovian exoplanet
Zucker, S.; Schorr, A.; Binnenfeld, A.
We report the discovery of GJ 2126 b, a highly eccentric (e = 0.85) Jupiter-like planet orbiting its host star every 272.7 days. The planet was detected and characterized using 112 radial velocity (RV) measurements from HARPS (High Accuracy Radial velocity Planet Searcher), provided by HARPS-RVBank. This planet orbits a low-mass star and ranks amo…
New Perspective on the Multiple-population Phenomenon in Galactic Globular Clusters from a Wide-field Photometric Survey
Milone, A. P.; Cordoni, G.; Marino, A. F. +10 more
Wide-field photometry of Galactic globular clusters (GCs) has been investigated to overcome limitations from the small field of view of the Hubble Space Telescope in the study of multiple populations. In particular, "chromosome maps" (ChMs) built with ground-based photometry were constructed to identify the first- and second-generation (1G and 2G)…
Constraints on optical and near-infrared variability in the localization of the long-period radio transient GLEAM-X J1627-52
Lyman, J. D.; Dhillon, V. S.; Steeghs, D. T. H. +5 more
GLEAM-X J1627-52 was discovered as a periodic (
Analysis and interpretation of the in-flight dynamics of a critical space mechanism
Dalla Ricca, Edoardo; Bortoluzzi, Daniele; Vignotto, Davide
The study hereby presented develops a mechatronic model of a critical space mechanism for a comprehensive interpretation of its in-flight performance. The mechanism was operated in the LISA Pathfinder European Space Agency mission, which was flown to test key technologies developed for detecting gravitational waves from space. The mission accompli…
Intervening nuclear obscuration changing the X-ray look of the z ≈ 6 quasi-stellar object CFHQS J164121+375520
Brandt, W. N.; Vignali, C.; Gilli, R. +16 more
X-ray observations of the optically selected z = 6.025 quasi-stellar object (QSO) CFHQS J164121+375520 (hereafter J1641) revealed that its flux dropped by a factor of ≳7 between 2018, when it was a bright and soft X-ray source, and 2021. Such a strong variability amplitude has not been observed before among z > 6 QSOs, and the underlying physic…
Smart Kanata: A framework for autonomous decision-making in rapid follow-up observations of cataclysmic variables
Maehara, Hiroyuki; Nogami, Daisaku; Uemura, Makoto +11 more
Studying the early stages of transient events provides crucial information about the fundamental physical processes in cataclysmic variables (CVs). However, determining an appropriate observation mode immediately after the discovery of a new transient presents challenges due to significant uncertainties regarding its nature. We developed a framewo…
Extracting the X-Ray Reverberation Response Functions from the Active Galactic Nucleus Light Curves Using an Autoencoder
Chainakun, Poemwai; Jiang, Jiachen; Young, Andrew J. +5 more
We study the X-ray reverberation in active galactic nuclei (AGN) using the variational autoencoder (VAE), which is a machine learning algorithm widely used for signal processing and feature reconstruction. While the X-ray reverberation signatures that contain the information of the accretion disk and the X-ray-emitting corona are commonly analyzed…
Assessing the detection of the Yarkovsky effect using the Gaia DR3 and FPR catalogues
Oszkiewicz, Dagmara; Bartczak, Przemysław; Dziadura, Karolina
Aims. The primary objective of this study was to use the newest Gaia Focused Product Release (FPR) catalogue, which contains ultra-precise asteroid astrometry spanning 66 months, to detect the Yarkovsky effect. This non-gravitational acceleration affects the orbits of small asteroids. Moreover, we examined close approaches of near-Earth asteroids …
Miscentring of optical galaxy clusters based on Sunyaev-Zeldovich counterparts
Strauss, Michael A.; Hilton, Matt; Sifón, Cristóbal +7 more
The 'miscentring effect', i.e. the offset between a galaxy cluster's optically defined centre and the centre of its gravitational potential, is a significant systematic effect on brightest cluster galaxy (BCG) studies and cluster lensing analyses. We perform a cross-match between the optical cluster catalogue from the Hyper Suprime-Cam (HSC) Surve…