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A dusty rain falls on the nova V959 Monocerotis
Evans, A.; Banerjee, D. P. K.; Varricatt, W. P. +1 more
We present archival and ground-based infrared observations of the γ-ray-emitting nova V959 Mon, covering the period 100-4205 d after the 2012 eruption. We use these data to determine that the secondary in the nova system is a G5 main sequence star. Data from the NEOWISE survey reveal a significant increase in the emission at 3.4 and 4.6 $\, \mu$m …
How Does the Critical Torus Instability Height Vary with the Solar Cycle?
van Driel-Gesztelyi, Lidia; Green, Lucie M.; Barnes, Graham +2 more
The ideal magnetohydrodynamic torus instability can drive the eruption of coronal mass ejections. The critical threshold of magnetic field strength decay for the onset of the torus instability occurs at different heights in different solar active regions, and understanding this variation could therefore improve space weather prediction. In this wo…
Direct Evidence of the Hybrid Nature of Extreme-ultraviolet Waves and the Reflection of the Fast-mode Wave
Chen, P. F.; Chandra, Ramesh; Devi, Pooja
We performed an analysis of the extreme-ultraviolet (EUV) wave event on 2022 March 31. The event originated from active region (AR) 12975 located at N13W52 in the field of view of the Atmospheric imaging Assembly (AIA) and exactly at the west limb viewed by the EUV Imager (EUVI) of the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) satel…
Flares during eclipses of high-mass X-ray binary systems Vela X-1, 4U 1700-37, and LMC X-4
Paul, Biswajit; Paul, K. T.; Jithesh, V. +2 more
In eclipsing X-ray binary systems, the direct X-ray emission is blocked by the companion star during the eclipse. We observe only reprocessed emission that contains clues about the environment of the compact object and its chemical composition, ionization levels, etc. We have found flares in some X-ray binaries during their eclipses. The study of …
Evaluation of the performance of a CdZnTe-based soft γ -ray detector for CubeSat payloads
Parker, Quentin A.; Ritter, Andreas; Pal, Partha Sarathi +4 more
The low-energy γ -ray (0.1-30 MeV) sky has been relatively unexplored since the decommissioning of the COMPTEL instrument on the Compton Gamma-Ray Observatory (CGRO) satellite in 2000. However, the study of this part of the energy spectrum (the "MeV gap") is crucial for addressing numerous unresolved questions in high-energy and multi-messenger as…
Asymmetry of the spectral lines of the coronal hole and quiet Sun in the transition region
Kayshap, Pradeep; Safari, Hossein; Hosseini, Razieh +1 more
The asymmetry of line profiles, i.e. the secondary component, is crucial to understanding the energy release of coronal holes (CH), quiet Sun (QS), and bright points (BPs). We investigate the asymmetry of Si IV 1393.75 Å of the transition-region (TR) line recorded by Interface Region Imaging Spectrograph (IRIS) and co-spatial-temporal Atmospheric …
Mercury's plasma environment after BepiColombo's third flyby
Fränz, Markus; Krüger, Harald; Saito, Yoshifumi +22 more
Understanding Mercury's magnetosphere is crucial for advancing our comprehension of how the solar wind interacts with the planetary magnetospheres. Despite previous missions, several gaps remain in our knowledge of Mercury's plasma environment. Here, we present findings from BepiColombo's third flyby, offering a synoptic view of the large scale st…
Magnetic Fields Observed along the East–West Outflow of IRAS 16293-2422
Pattle, Kate; Sadavoy, Sarah; Looney, Leslie W. +6 more
Magnetic fields likely play an important role in the formation of young protostars. Multiscale and multiwavelength dust polarization observations can reveal the inferred magnetic field from scales of the cloud to core to protostar. We present continuum polarization observations of the young protostellar triple system IRAS 16293-2422 at 89 µm…
Insights on the Optical and Infrared Nature of MAXI J0709-159: Implications for High-Mass X-ray Binaries
Mathew, Blesson; Muneer, S.; Joshi, Santosh +4 more
In our previous study (Bhattacharyya et al., 2022), HD 54786, the optical counterpart of the MAXI J0709-159 system, was identified to be an evolved star, departing from the main sequence, based on comparisons with non-X-ray binary systems. In this paper, using color-magnitude diagram (CMD) analysis for High-Mass X-ray Binaries (HMXBs) and statisti…
ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge
Saha, A.; Mao, S.; Zang, Weicheng +11 more
The Robotic Observations of Microlensing Events/Reactive Event Assessment Survey was a Key Project at Las Cumbres Observatory (hereafter LCO) which continuously monitored 20 selected fields (3.76 sq.deg) in the Galactic Bulge throughout their seasonal visibility window over a three-year period, between 2017 March and 2020 March. Observations were …