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The impact of the presence of water ice on the analysis of debris disk observations
Wolf, S.; Stuber, T. A.
Context. The analysis of debris disk observations is often based on the assumption of a dust phase composed of compact spherical grains consisting of astronomical silicate. Instead, observations indicate the existence of water ice in debris disks.
Aims: We quantify the impact of water ice as a potential grain constituent in debris disks on th…
Selection of the Main Control Parameters for the Dst Index Prediction Model Based on a Layer-wise Relevance Propagation Method
Zhang, J.; Wang, Z.; Li, Y. Y. +8 more
The prediction of the Dst index is an important subject in space weather. It has significant progress with the prevalent applications of neural networks. The selection of input parameters is critical for the prediction model of the Dst index or other space-weather models. In this study, we perform a layer-wise relevance propagation (LRP) method to…
Planet Patrol: Vetting Transiting Exoplanet Candidates with Citizen Science
Kostov, Veselin B.; Kuchner, Marc J.; Brande, Jonathan +15 more
NASA's TESS mission yields light curves for tens of millions of stars spread across the entire sky, a data set that will be a challenge to fully exploit without help from citizen scientists. To address this, we launched a new citizen science project, called "Planet Patrol", designed to analyze TESS data on exoplanet and eclipsing binary candidates…
The 2020 Eclipse of R Aquarii in the Near-infrared: Mid-eclipse Observations of Disk Distress
Fekel, Francis C.; Hinkle, Kenneth H.; Lebzelter, Thomas +2 more
The Mira in the bright, dusty, symbiotic binary R Aquarii undergoes eclipses of multiyear duration every ~44 yr by a large, opaque accretion disk. The 2020 eclipse was confirmed by I-band photometry. High-resolution M- and K-band spectra were observed near the midpoint of the eclipse, in 2020 August and September. The 4.5-5.5 µm spectrum dur…
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions
Zurek, David R.; Kroupa, Pavel; Long, Knox S. +4 more
We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC 7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC, F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2, F300W, UV) which were both onboard the Hubble Space Telescope. The FUV - UV colour-magnitude diagram (CMD) shows a main sequence (MS) tu…
Estimation of Galactic Spiral Density Wave Parameters Based on the Velocities of OB2 Stars from the Gaia EDR3 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of 9750 OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalogue. The relative parallax errors for these stars do not exceed 10${%}$. Based on the entire sample of stars, we have found the velocities $(U,V)_{\odot}=(7.17,7.37)±(0.16,0.24)$ km s${}^{-1}$ and the components of th…
X-ray spectral and timing analysis of the Compton Thick Seyfert 2 galaxy NGC 1068
Stalin, C. S.; Marchesi, S.; Parker, M. L. +2 more
We present the timing and spectral analysis of the Compton Thick Seyfert 2 active galactic nuclei NGC 1068 observed using NuSTAR and XMM-Newton. In this work for the first time we calculated the coronal temperature ($\rm {kT_{e}}$) of the source and checked for its variation between the epochs if any. The data analysed in this work comprised of (a…
Star Formation Triggered by the Expanding Bubble S111
Mookerjea, Bhaswati
This paper investigates the impact of radiative and mechanical feedback from O-type stars on their parent molecular clouds and the triggering of formation of a future generation of stars. We study the infrared bubble S111 created by the embedded massive stellar cluster G316.80-0.05. A significant fraction of gas in shells created due to the compre…
Formation of Coronal Mass Ejection and Posteruption Flow of Solar Wind on 2010 August 18 Event
Slemzin, Vladimir; Goryaev, Farid; Rodkin, Denis
The state of the space environment plays a significant role in the forecasting of geomagnetic storms produced by disturbances of the solar wind (SW). Coronal mass ejections (CMEs) passing through the heliosphere often have a prolonged (up to several days) trail with declining speed, which affects propagation of the subsequent SW streams. We studie…
Pipeline for the Antarctic Survey Telescope 3-3 in Yaoan, Yunnan
Wang, Lifan; Castro-Tirado, A. J.; Hu, Lei +5 more
AST3-3 is the third robotic facility of the Antarctic Survey Telescopes (AST3) for transient surveys to be deployed at Dome A, Antarctica. Due to the current pandemic, the telescope has been currently deployed at the Yaoan Observation Station in China, starting the commissioning observation and a transient survey. This article presented a fully au…