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Variation of ionospheric plasma density during the annular solar eclipse on December 26, 2019
Palit, Sourav; Kundu, Subrata; Chowdhury, Swati +2 more
The annular solar eclipse of the previous decade that occurred on December 26, 2019, was mostly visible from most Asian countries, including India. In this manuscript, we present the variation of ionospheric plasma density profiles at different heights during the eclipse and non-eclipse days. We use both the ground- and space-based instruments to …
Variability of Jupiter's Main Auroral Emission and Satellite Footprints Observed With HST During the Galileo Era
Clarke, John T.; Moore, Luke; Bonfond, Bertrand +3 more
Hubble Space Telescope images of Jupiter's UV aurora show that the main emission occasionally contracts or expands, shifting toward or away from the magnetic pole by several degrees in response to changes in the solar wind dynamic pressure and Io's volcanic activity. When the auroral footprints of the Galilean satellites move with the main emissio…
Follow‑up observations of the binary system γ Cep
Mugrauer, Markus; Buder, Sven; Ginski, Christian +2 more
We present new imaging and spectroscopic observations of the exoplanet host star $\gamma$ Cep A, and of its low-mass stellar companion $\gamma$ Cep B. We used AstraLux/CAHA to follow the orbital motion of the companion around its primary, whose radial velocity was determined with spectra of the star, taken with the spectrograph FLECHAS at the Univ…
Ionized Carbon around IRC+10216
Smith, Nathan; Tram, Le Ngoc; Reach, William T. +5 more
Asymptotic giant branch stars create a rich inventory of molecules in their envelopes as they lose mass during later stages of their evolution. These molecules cannot survive the conditions in interstellar space, where they are exposed to ultraviolet photons of the interstellar radiation field. As a result, daughter molecules are the ones injected…
Assimilation of Temperatures and Column Dust Opacities Measured by ExoMars TGO-ACS-TIRVIM During the MY34 Global Dust Storm
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +7 more
We assimilate atmospheric temperature profiles and column dust optical depth observations from the ExoMars Trace Gas Orbiter Atmospheric Chemistry Suite thermal infrared channel (TIRVIM) into the Mars Planetary Climate Model. The assimilation period is Mars Year 34 Ls = 182.3°-211.4°, covering the onset and peak of the 2018 global dust …
A CHEOPS Search for Massive, Long-period Companions to the Warm Jupiter K2-139 b
Smith, Alexis M. S.; Csizmadia, Szilárd
K2-139 b is a warm Jupiter with an orbital period of 28.4 days, but only three transits of this system have previously been observed-in the long-cadence mode of K2-limiting the precision with which the orbital period can be determined and future transits predicted. We report photometric observations of four transits of K2-139 b with ESA's CHaracte…
A broad-band X-ray study of the asynchronous polar CD Ind
Dutta, Anirban; Rana, Vikram
We present a simultaneous broad-band analysis of X-ray data obtained with the XMM-Newton and the Nuclear Spectroscopic Telescope Array (NuSTAR) for the asynchronous polar source, CD Ind. The spin-folded light curve in the soft 0.3-3.0 keV band shows a single broad hump-like structure superimposed with occasional narrow dips, indicating a single-po…
The Ultraviolet C II Lines as a Diagnostic of κ-distributed Electrons in Planetary Nebulae
Zhang, Yong; Yao, Zheng-Wei
Non-Maxwellian κ electron energy distributions (EEDs) have been proposed in recent years to resolve the so-called "electron temperature and abundance discrepancy problem" in the study of planetary nebulae (PNs). Thus the need to develop diagnostic tools to determine from observations the EED of PNs is raised. Arising from high-energy levels, the u…
H1821+643: The Most X-Ray and Infrared Luminous Active Galactic Nucleus (AGN) in the Swift/BAT Survey in the Process of Rapid Stellar and Supermassive Black Hole Mass Assembly
Hashimoto, Takuya; Ricci, Claudio; Izumi, Takuma +6 more
H1821+643 is the most X-ray luminous nonbeamed active galactic nucleus (AGN) of L 14-150 keV = 5.2 × 1045 erg s-1 in the Swift/Burst Alert Telescope (BAT) ultrahard X-ray survey, and it is also a hyperluminous infrared (IR) galaxy L IR = 1013.2 L ⊙ residing in the center of a massiv…
Dwarf Irregular Galaxy Leo A. II. Suprime-Cam R and Hα Stellar Photometry
Stonkutė, Rima; Vansevičius, Vladas
We have surveyed the complete extent of Leo A, which is an apparently isolated Local Group dwarf irregular galaxy, in B, V, R, I (the Johnson-Cousins system), and NA656 (centered on Hα) passbands with the Subaru Telescope equipped with the Suprime-Cam mosaic camera. B, V, and I photometry results were published earlier by Stonkutė et al. The recen…