Search Publications
Superflare on a rapidly-rotating solar-type star captured in X-rays
Sunyaev, Rashid; Gilfanov, Marat; Bikmaev, Ilfan +5 more
In this work, we studied X-ray source SRGe J021932.4‑040154 (SRGe J021932), which we associated with a single X-ray active star of spectral class G2V-G4V and the rotational period
Detection of a Magnetic Discontinuity in the Upper Solar Chromosphere Associated with a Coronal Loop Brightening Observed by CLASP2.1
Song, Donguk; Rachmeler, Laurel A.; Kobayashi, Ken +15 more
We report the first detection of a magnetic discontinuity in the upper solar chromosphere associated with a coronal loop brightening. Our findings are based on novel observations obtained by the Chromospheric LAyer SpectroPolarimeter (CLASP2.1) suborbital space experiment. During its short 6 minute flight, CLASP2.1 successfully obtained spectropol…
Temporal and spatial variation in subsurface cryosphere in East Coprates Planum, Mars
Dasgupta, Dipayan
There is general acceptance among researchers regarding the presence of a cryosphere in the subsurface of Mars. The two main geomorphic indications assumed to support the existence of this cryospheric layer are layered ejecta rampart craters and outflow channels. In essence, a layered ejecta rampart crater is a crater with an ejecta blanket having…
An optically led search for kilonovae to z~0.3 with the Kilonova and Transients Programme (KNTraP)
Rest, Armin; Auchettl, Katie; Valdes, Francisco +15 more
Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered by radioactive decay of newly synthesised r-process elements. A few kilonova candidates have been observed during short gamma-ray burst follow-up, and one found associated with a gravitational wave detection, GW170817. Ho…
Large solar energetic particles and solar radio emissions during Cycle 25. A comparative analysis of trends and characteristics with cycles 23 and 24
Ndacyayisenga, Theogene; Uwamahoro, Jean; Uwamahoro, Jean Claude +2 more
Solar energetic particles (SEPs) affect space weather in both the heliosphere and on Earth. The present study investigates the occurrences of large SEP events focusing on their influence on the Earth, as well as their correlation with solar radio bursts (SRBs). The velocity dispersion analysis (VDA) is used to calculate the release times of large …
Sympathetic Solar Eruption on 2024 February 9
Feng, Li; Li, Shu-Yue; Zhang, Qing-Min +4 more
In this paper, we perform a follow-up investigation of the solar eruption originating from active region 13575 on 2024 February 9. The primary eruption of a hot channel generates an X3.4 class flare, a full-halo coronal mass ejection (CME), and an extreme-ultraviolet (EUV) wave. Interaction between the wave and a quiescent prominence (QP) leads to…
Implication of Galaxy-scale Negative Feedback by One of the Most Powerful Multiphase Outflows in a Hyperluminous Infrared Galaxy at Intermediate Redshift
Imanishi, Masatoshi; Iono, Daisuke; Saito, Toshiki +12 more
Powerful galactic outflows driven by active galactic nuclei (AGNs) are commonly considered as one of the main mechanisms to regulate star formation in massive galaxies. Ultra- and hyperluminous IR galaxies (U/HyLIRGs) are thought to represent a transition phase of galaxies from a rapidly growing period to a quiescent status as gas is swept out by …
Kinematics of high-velocity stars utilizing LAMOST and Gaia DR3 archives within 100 kpc
Elsanhoury, Waleed
The kinematic parameters identified from high-velocity stars situated within $\sim100$ kpc are examined and analyzed. We included three high-velocity programs comprising 591, 87, and 519 stars as a function of distances ranging from $0.10$ to nearly $109$ kpc. In this analysis, we will determine the spatial velocities $(U, V, W)$ in galactic coord…
New Ultracool Companions to Nearby White Dwarfs
Debes, John H.; Meisner, Aaron M.; Kirkpatrick, J. Davy +15 more
We conducted a search for new ultracool companions to nearby white dwarfs using multiple methods, including the analysis of colors and examination of images in both the optical and the infrared. Through this process, we identified 51 previously unrecognized systems with candidate ultracool companions. 31 of these systems are resolved in at least o…
A Centroiding Algorithm for Point-source Trails
Rambaux, Nicolas; Lainey, Valéry; Cooper, Nick +3 more
Astrometric measurements are significantly challenged by the relative motion between the point source and the telescope, primarily due to the difficulty in accurately determining the position of the point source at the mid-exposure moment. Especially when the trail is irregular in shape or results from nonuniform relative motion, determining the c…