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Six Newly Discovered Eclipsing Binary Systems in the TESS field
Ulaş, Burak; Ayan, Vildan
We present the first detailed investigation of six eclipsing binary systems in the TESS field. The TESS light curves of the targets are analyzed by determining the initial effective temperatures via SED fits. The absolute parameters are derived and the systems are compared to well-known binaries of the same type. Results show that CD-58791, CD-621…
The planetary system around HD 190622 (TOI-1054). Measuring the gas content of low-mass planets orbiting F-stars
Alonso, R.; Deleuil, M.; Erikson, A. +107 more
Context. Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constraints improve our understanding of planetary formation processes such as the delivery of volatile-rich planetesima…
Statistical study of extreme-ultraviolet nanoflares in the quiet-Sun transition region
Fludra, A.
Aims: We carried out a large statistical study of ubiquitous small-scale extreme-ultraviolet (EUV) brightenings in the nanoflare energy range in the quiet-Sun transition region to derive their properties, estimate their contribution to the heating of the solar atmosphere, and compare their numbers to the coronal events published in the litera…
Far ultra-violet insights into NGC 1399's globular cluster population
Kundu, Arunav; Dage, Kristen C.; Zepf, Stephen E. +2 more
We investigate archival Hubble Space Telescope ACS/SBC F140LP observations of NGC 1399 to search for evidence of multiple stellar populations in extragalactic globular clusters. Enhanced far-ultraviolet (FUV) populations are thought to be indicators of He-enhanced second generation populations in globular clusters, specifically extreme/blue horizo…
Analysis of metallicities of open clusters in the Galactic disc
Li, Zhongmu; Deng, Yangyang
The metallicities of open clusters (OCs) are probes for many Galactic disc properties, such as age-metallicity relation and abundance gradient evolution. In recent years, a large number of newly found OCs or OC candidates have been reported. However, the metallicity values of OCs in the Galactic disc in different works vary from each other. In par…
2021 superoutburst of the WZ Sge-type dwarf nova V627 Pegasi lacks an early superhump phase
Ruiz, Javier; Nogami, Daisaku; Tampo, Yusuke +27 more
Superoutbursts in WZ Sge-type dwarf novae (DNe) are characterized by both early superhumps and ordinary superhumps originating from the 2 : 1 and 3 : 1 resonances, respectively. However, some WZ Sge-type DNe show a superoutburst lacking early superhumps; it is not well established how these differ from superoutbursts with an early superhump phase.…
PAH emission features in star-forming regions and late type stars
Kumar, Brijesh; Rastogi, Shantanu; Anand, Rahul Kumar
Mid-infrared emission spectra, obtained from ISO archive, of thirteen astrophysical objects as well as computed spectra of 27 polycyclic aromatic hydrocarbon (PAH) molecules are studied. All the objects show strong aromatic infrared band (AIB) features with variations that correlate with object type. Based on AIB peak positions, the features for I…
A compendium of the best-preserved terrestrial hypervelocity impact crater in a basaltic terrain: The Lonar, India
Chavan, Anil; Bhandari, Subhash; Sajinkumar, K. S. +6 more
As impact cratering is regarded as the most fundamental process in the modification of planetary surfaces, it is crucial to investigate and identify terrestrial impact craters with credible evidences to learn more about the planet's evolutionary path. Consequently, terrestrial impact craters are considered as proxies for planetary explorations. Ho…
The Effects of the Polar Rain on the Polar Wind Ion Outflow From the Nightside Ionosphere
Rong, Zhaojin; Wang, Jing; Yang, Qian +7 more
The polar wind, consisting of low-energy ions and electrons, is an outflow along the open magnetic field lines from the polar cap ionosphere to the magnetosphere. Previous studies found that both solar radiation and solar wind electromagnetic energy are the two main energy sources for the polar wind. The polar rain, being field-aligned precipitati…
Ion kinetic effects linked to magnetic field discontinuities in the slow Alfvénic wind observed by Solar Orbiter in the inner heliosphere
D'Amicis, Raffaella; Perrone, Denise; Perri, Silvia +2 more
Slow solar wind, sharing magnetic and plasma properties typical of fast wind, the so-called slow Alfvénic wind, has been widely observed in the heliosphere. Here, we report an analysis of the turbulent properties of a slow Alfvénic stream observed by Solar Orbiter at 0.64 AU. This solar wind stream is characterized by well distinguishable regions,…