Search Publications
Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point
Schmieder, Brigitte; Ding, Mingde; Zhu, Jiahao +1 more
Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP), we study the formation and evolution of a jet …
High-energy gamma-ray emission powered by a young protostar: the case of S255 NIRS 3
Su, Yang; de Oña Wilhelmi, Emma; López-Coto, Rubén
Evidence of efficient acceleration of cosmic rays in massive young stellar objects has been recently reported. Among these massive protostars, S255 NIRS 3, for which extreme flaring events associated with radio jets have been detected, is one of the best objects to test this hypothesis. We search for gamma-ray emission associated with this object …
Long-term optical variability of the Be/X-ray binary GRO J2058+42
Blinov, D.; Reig, P.; Tzouvanou, A. +1 more
Context. GRO J2058+42 is a transient hard X-ray pulsar that occasionally goes into outburst. The optical counterpart is a poorly studied OB-type companion.
Aims: We investigate the long-term optical variability of the Be/X-ray binary GRO J2058+42 and the possible connection with periods of enhanced X-ray activity.
Methods: We performed a…
Two sub-Neptunes around the M dwarf TOI-1470
Tamura, M.; Amado, P. J.; Caballero, J. A. +50 more
Aims: A transiting planet candidate with a sub-Neptune radius orbiting the nearby (d = 51.9 ± 0.07 pc) M1.5 V star TOI-1470 with a period of ~2.5 d was announced by the NASA Transiting Exoplanet Survey Satellite (TESS), which observed the field of TOI-1470 in four different sectors. We aim to validate its planetary nature using precise radial…
Gaia search for stellar companions of TESS Objects of Interest IV
Mugrauer, M.; Rück, J.; Michel, K. -U.
We present the latest results of our ongoing multiplicity study of (Community) TESS Objects of Interest, using astrometric and photometric data from the ESA‑Gaia mission to detect stellar companions of these stars and characterize their properties. A total of 134 binary, 6 hierarchical triple, and two quadruple star systems are identified among 11…
ALMA and Keck analysis of Fomalhaut field sources: JWST's Great Dust Cloud is a background object
Kalas, Paul; Fitzgerald, Michael P.; Kennedy, Grant M. +1 more
At 7.7 pc, the A-type star Fomalhaut hosts a bright debris disc with multiple radial components. The disc is eccentric and misaligned, strongly suggesting that it is sculpted by interaction with one or more planets. Compact sources are now being detected with JWST, suggesting that new planet detections may be imminent. However, to confirm such sou…
PAH Emission from Star-forming Galaxies in JWST Mid-infrared Imaging of the Lensing Cluster SMACS J0723.3-7327
Langeroodi, Danial; Hjorth, Jens
The mid-infrared spectra of star-forming galaxies (SFGs) are characterized by characteristic broad polycyclic aromatic hydrocarbon (PAH) emission features at 3-20 µm. As these features are redshifted, they are predicted to dominate the flux at specific mid-infrared wavelengths, leading to substantial redshift-dependent color variations in br…
Photometric Properties and Stellar Parameters of the Rapidly Rotating Magnetic Early-B Star HD 345439
Zhang, Yu; Liu, Jin-Zhong; Li, Lei +8 more
We first present the multicolor photometry results of the rapidly rotating magnetic star HD 345439 using the Nanshan One-meter Wide-field Telescope. From the photometric observations, we derive a rotational period of 0.7699 ± 0.0014 day. The light curves of HD 345439 are dominated by the double asymmetric S-wave feature that arises from the magnet…
Unraveling the Thermodynamic Enigma between Fast and Slow Coronal Mass Ejections
Wang, Yuming; Zhang, Jie; Mishra, Wageesh +3 more
Coronal mass ejections (CMEs) are the most energetic expulsions of magnetized plasma from the Sun that play a crucial role in space weather dynamics. This study investigates the diverse kinematics and thermodynamic evolution of two CMEs (CME1: 2011 September 24 and CME2: 2018 August 20) at coronal heights where thermodynamic measurements are limit…
Cluster aggregates surrounding Pismis 5 in the Vela molecular ridge
Hu, Qingshun; Zhang, Yu; Ma, Shuo +5 more
Context. In the Gaia era, the precision of astrometric data is unprecedented. High-quality data make it easier to find more cluster aggregates and gather further confirmation of these open clusters.
Aims: We use Gaia Data Release 3 (DR3) to redetermine the open clusters surrounding Pismis 5 in the Vela molecular ridge (VMR). We also investiga…