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Estimation of classical Cepheid's physical parameters from NIR light curves
Balázs, Lajos G.; Kovács, Gábor B.
Recent space-borne and ground-based observations provide photometric measurements as time series. The data points are nearly continuous over a limited observational interval or randomly scattered over a long period. The effect of interstellar dust extinction in the near-infrared range is only 10% of that measured in the visual (V) range. However, …
Thermal stresses as a possible mechanism for initiating the destruction of comet Shoemaker-Levy 9
Omarov, Chingis; Shestakova, Lyubov I.; Spassyuk, Ruslan
It is now widely accepted that the breakup of comet Shoemaker-Levy 9 (SL9) was caused by tidal forces. This explanation applies to bodies that enter a planet's Roche zone and have a loose 'rubble pile' structure with no internal strength. Observations from the Rosetta mission to comet 67P/Churyumov-Gerasimenko initially supported this hypothesis, …
Accretion onto WD 2226-210, the central star of the Helix Nebula
Chu, Y. -H.; Estrada-Dorado, S.; Guerrero, M. A. +4 more
The central star of the Helix Nebula, WD 2226
An X-ray study of changing-look active galactic nuclei
Titarchuk, Lev; Seifina, Elena; Mishin, Egor
A significant number of changing-look active galactic nuclei (CL AGNs) have been identified to date. In this work, we study what happens to the X-ray spectrum during CL events. We use the example of the nearby CL Seyfert named NGC 1566, which has been observed by Swift, NuSTAR, XMM-Newton, and Suzaku. We applied the Comptonization model to describ…
Aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +16 more
The Nadir and Occultation for MArs Discovery spectrometer on board Trace Gas Orbiter began science operations in April 2018, providing infrared and ultraviolet-visible spectra of the Martian atmosphere. This paper explores the application of the UVIS channel in solar occultation to study aerosols. We have developed a retrieval scheme that allows u…
Estimation of Transit Time of CMEs from the Sun to Earth
Ravishankar, Anitha; Michałek, Grzegorz; Pattnaik, Ashutosh
Coronal mass ejections (CMEs) can cause severe geomagnetic storms on Earth, making it essential to forecast their arrival. However, predicting the transit time (TT) of Earth-directed CMEs is challenging due to the complex factors involved, such as CME dynamics, the state of the interplanetary medium, and CME interactions. Our goal is to predict th…
Thermal environment and erosion of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Keller, H. U.; Groussin, O. +11 more
Aims. This paper focuses on how insolation affects the nucleus of comet 67P/Churyumov-Gerasimenko over its current orbit. We aim to better understand the thermal environment of the nucleus, in particular its surface temperature variations, erosion, relationship with topography, and how insolation affects the interior temperature for the location o…
Green Peas in the Southern Sky: Broadband Color Selection and Spectroscopic Follow-up
Lee, Jeong Hwan; Shim, Hyunjin; Jeong, Yejin +1 more
We present a systematic search for 1696 green pea (GP) galaxy candidates in the southern hemisphere selected from the Dark Energy Survey Data Release 2 and provide preliminary results from spectroscopic follow-up observations of 26 targets chosen among them. Our selection criteria include the colors in the gri bands and compact morphology in the c…
Mysteries of the 17 May 2012 Solar Event Responsible for GLE71: II. Features of the Flare and Its Atypical Microwave Emission
Grechnev, V. V.; Lysenko, A. L.; Kiselev, V. I. +2 more
As known, large near-Earth proton enhancements usually occur after major eruptive solar flares accompanied by strong microwave bursts. Typically, the spectral-maximum frequency of such a burst exceeds 10 GHz, and the flux exceeds
Surface brightness-colour relations of dwarf stars from detached eclipsing binaries: II. Extension of the calibrating sample
Smolec, R.; Kervella, P.; Maxted, P. F. L. +21 more
Aims. Surface brightness-colour relations (SBCRs) are useful tools for predicting the angular diameters of stars. They offer the possibility to calculate precise spectrophotometric distances based on the eclipsing binary method or the Baade–Wesselink method. Double-lined detached eclipsing binary stars (SB2 DEBs), with precisely known trigonometri…