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Transit-timing variations in the AU Mic system observed with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +86 more
Context. AU Mic is a very active M dwarf star with an edge-on debris disk and two known transiting sub-Neptunes with a possible third planetary companion. The two transiting planets exhibit significant transit-timing variations (TTVs) that are caused by the gravi tational interaction between the bodies in the system. Aims. Using photometrical obse…
The distortion solution for the 1-m telescope at Yunnan Observatory and its application to the positional measurement of four main-belt asteroids Eugenia(45), Roma(472), Lundmarka(1334) and Autonoma(1465)
Wang, Na; Liu, Kai-Rui; Xue, Zheng-Yang +2 more
Four main-belt asteroids Eugenia, Roma, Lundmarka and Autonoma were observed at Yunnan Observatory 1-m telescope in 2022–2023. A total of 66 CCD frames for the four asteroids are observed. In order to improve the astrometry, the geometric distortion (called GD hereafter) of the 1-m telescope is solved. After GD correction, the precision of Eugenia…
Non-thermal emission in galaxy groups at extremely low frequency: The case of A1213
Gastaldello, F.; Santra, R.; Eckert, D. +7 more
Context. Galaxy clusters and groups are the last link in the chain of hierarchical structure formation. Their environments can be significantly affected by outbursts from active galactic nuclei (AGN), especially in groups where the medium density is lower and the gravitational potential is shallower. Thus, interaction between AGN and group weather…
Disk in the Circumstellar Envelope of Carbon Mira V Cygni
Strakhov, Ivan A.; Shenavrin, Victor I.; Safonov, Boris S. +2 more
Asymptotic giant branch (AGB) stars are the primary source of dust and complex molecules in the interstellar medium. The determination of outflow parameters is often hindered by the unknown geometry of the circumstellar environment, creating a demand for high-angular resolution observations. We use our near-infrared spectra and photometry of the c…
High-frequency Power Spectrum of Active Galactic Nucleus NGC 4051 Revealed by NICER
Hamaguchi, K.; Papadakis, I.; Kara, E. +6 more
Variability studies offer a compelling glimpse into black hole dynamics, and Neutron Star Interior Composition Explorer's (NICER's) remarkable temporal resolution propels us even further. NICER observations of an active galactic nucleus (AGN), NGC 4051, have charted the geometry of the emission region of the central supermassive black hole. Our in…
Accretion disc dynamics in extragalactic black hole X-ray binaries: a comprehensive study of M33 X-7, NGC 300 X-1, and IC 10 X-1
Nandi, Anuj; Bhuvana, G. R.
Extragalactic black hole X-ray binaries (BH-XRBs) are the most intriguing X-ray sources as some of them are 'home' to the most massive stellar-mass BHs ever found. In this work, we conduct a comprehensive study of three massive, eclipsing extragalactic BH-XRBs i.e. M33X-7, NGC300X-1, and IC10X-1 and using entire X-ray observations available from X…
MeerKAT discovery of gigahertz radio emission extending from Abell 3017 towards Abell 3016
Hu, Dan; Xu, Haiguang; Zhu, Zhenghao +18 more
Context. Cosmic filaments are vast, faint structures that connect galaxy clusters, often challenging to detect directly. However, filaments between pre-merger cluster pairs become more visible due to gas heating and compression while the clusters are approaching, enabling detection in X-ray and radio wavelengths. The clusters Abell 3017 and Abell …
An Enigmatic PeVatron in an Area around H II Region G35.6‑0.5
Liu, B.; Liu, Y.; Zhang, Yong +294 more
Identifying Galactic PeVatrons (PeV particle accelerators) from ultrahigh-energy (UHE, >100 TeV) γ-ray sources plays a crucial role in revealing the origin of Galactic cosmic rays. The UHE source 1LHAASO J1857+0203u is suggested to be associated with HESS J1858+020, which may be attributed to the possible PeVatron candidate supernova remnant (S…
Occultation constraints on solar system formation models
Buie, Marc W.; Porter, Simon B.; Keller, John M. +1 more
The process by which a system of non-luminous bodies form around a star is fundamental to understanding the origins of our own solar system and how it fits into the context of other systems we have begun to study around other stars. Some basics of solar system formation have emerged to describe the process by which dust and gas around a newly form…
LAMOST J171013+532646: A detached short-period noneclipsing hot subdwarf + white dwarf binary
Huang, Xin; Chen, Xuefei; Li, Zhenwei +9 more
We present an analysis of LAMOST J171013.211+532646.04 (hereafter J1710), a binary system comprising a hot subdwarf B star (sdB) and a white dwarf (WD) companion. Multi-epoch spectroscopy revealed an orbital period of 109.20279 minutes, consistent with TESS and ZTF photometric data. This means that this is the sixth detached system known to harbor…