Search Publications
Spatio-spectral-temporal modelling of two young pulsar wind nebulae
Venter, C.; Torres, Diego F.; Sushch, I. +5 more
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our multi-zone (1D) leptonic emission code to model the PWNe associated with G29.7
A detailed chemical study of the extreme velocity stars in the galaxy
Wyse, Rosemary F. G.; Hawkins, Keith; Reggiani, Henrique +3 more
Two decades on, the study of hypervelocity stars is still in its infancy. These stars can provide novel constraints on the total mass of the Galaxy and its dark matter distribution. However how these stars are accelerated to such high velocities is unclear. Various proposed production mechanisms for these stars can be distinguished using chemo-dyn…
A study of chemical abundances, rotational velocities, and orbital elements in single-lined spectroscopic binary stars in open clusters
Pereira, C. B.; Holanda, N.; Drake, N. A. +4 more
Binary interactions play a significant role in stellar evolution. In this study, we present a comprehensive analysis of 17 single-lined spectroscopic binary stars and identify two more as 'yellow stragglers', in the context of 15 young open clusters with ages younger than 1.0 Gyr. High-resolution spectroscopy ($R\, \approx \, 48000$) was employed …
Dust and Cold Gas Properties of Starburst HyLIRG Quasars at z ∼ 2.5
Neri, Roberto; Liu, Daizhong; Huang, Jia-Sheng +7 more
Some high-z active galactic nuclei (AGNs) are found to reside in extreme star-forming galaxies, such as hyperluminous infrared galaxies (HyLIRGs), with AGN-removed L IR of >1013 L ⊙. In this paper, we report NOEMA observations of six apparent starburst HyLIRGs associated with optical quasars at z ∼ 2–3 in the St…
The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs
Lester, Kathryn V.; Ikuta, Kai; Tamura, Motohide +100 more
Sub-Neptunes with radii of 2–3 R ⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties and bulk compositions of transiting sub-Neptunes provide clues to the formation and evolution of close-in small planets. In this paper, we present the discovery and follow-up of four sub-Neptunes orbiting M…
Predicting Arrival Times of the CCMC CME/Shock Events Based on the SPM3 Model
Feng, Shiwei; Li, Ran; Zhao, Xinhua +5 more
Coronal mass ejection (CME) is a powerful solar phenomenon that can lead to severe space weather events. Forecasting whether and when the corresponding interplanetary coronal mass ejection (ICME) will reach the Earth is very important in space weather study and forecast. At present, many different kinds of models use the near-Sun CME observations …
Early Growth of the Star Formation Rate Function in the Epoch of Reionization: An Approach with Rest-frame Optical Emissions
Asada, Yoshihisa; Ohta, Kouji
We present a star formation rate function (SFRF) at z ~ 6 based on star formation rates (SFRs) derived by spectral energy distribution fitting on data from rest-frame UV to optical wavelengths of galaxies in the CANDELS GOODS-South and North fields. The resulting SFRF shows an excess compared to the previous estimations by using rest-frame UV lumi…
Investigations on halo coronal mass ejections, sunspots and their geoeffectiveness in the rising phase of the solar cycle 25
Mujiber Rahman, A.; Kubera Raja, A.
In this research paper we investigated the halo coronal mass ejections and sunspot number during the period December 2019 to December 2023 for the rising phase of solar cycle 25. The SOHO/LASCO instrument observed 145 HCMEs during this period. We selected 145 halo CMEs and the associated flares, SSN and Dst. The HCME is found to be significantly f…
Upper limit of the solar wind protons backscattering efficiency from Comet 67P/Churyumov-Gerasimenko
Wieser, Martin; Wieser, Gabriella Stenberg; Canu-Blot, Romain
Context. Solar wind ions backscattering is a fundamental plasma-surface interaction process that may occur on all celestial bodies exposed to the solar wind and lacking a significant atmosphere or magnetosphere. Yet, observations have been limited to the regolith-covered Moon and Phobos, one of the Martian moons.
Aims: We aim to expand our kn…
A blind search for intraday gamma-ray transients with Fermi-LAT: Detections of GRB and solar emissions
Prokhorov, D. A.; Moraghan, A.
We present a search for intraday transient γ-ray signals using 15.4 yr of the Fermi Large Area Telescope data. The search is based on a recently developed variable-size sliding-time-window (VSSTW) analysis and is aimed at studying variable γ-ray emission from gamma-ray bursts (GRBs) and the Sun. We refined the algorithm for searches for transient …