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Charge sign dependence of recurrent Forbush decreases in 2016–2017
Heber, B.; Romaneehsen, L.; Marquardt, J.
Context. This study investigates the periodicities of galactic cosmic ray flux attributed to corotating interaction regions (CIRs) using Alpha Magnetic Spectrometer (AMS-02) data from late 2016 to early 2017. Aims. We determine the rigidity dependence of recurrent Forbush decrease (RFD) amplitudes induced by CIRs for different particles with a foc…
Spectro-photometry of Phobos simulants: I. Detectability of hydrated minerals and organic bands
Hasselmann, Pedro H.; Poggiali, Giovanni; Fornasier, Sonia +12 more
Previous Mars Reconnaissance Orbiter and Mars Express observations of Phobos and Deimos, the moons of Mars, have improved our understanding of these small bodies. However, their formation and composition remain poorly constrained. Physical and spectral properties suggest that Phobos may be a weakly thermal-altered captured asteroid but the dynamic…
Self-absorption in solar surge as observed by IRIS
Kayshap, Pradeep; Babu, B. Suresh; Tripathi, Sharad C.
Solar surges are collimated flows of plasma that occur in the periphery of active regions (ARs). The kinematics, physical properties, and triggering mechanisms of a solar surge were studied through imaging and spectroscopic diagnosis. The surge has a typical inverted Y-shape, and it moves with a speed of more than 200 km/s in the transition-region…
Upper limits of HO2 in the atmosphere of Mars from the ExoMars Trace Gas Orbiter
Montmessin, Franck; Belyaev, Denis A.; Fedorova, Anna A. +10 more
Odd-hydrogen (HO$_\mathrm{x}$) species have a crucial role in regulating the chemistry of the atmosphere of Mars and are important to understand some of the most fundamental aspects regarding its atmospheric composition such as the long-term stability of CO$_2$. Despite the key role of these species for our understanding of the Martian photochemis…
Modeling and Calibration of Gaia, Hipparcos, and Tycho-2 Astrometric Data for the Detection of Dark Companions
Feng, Fabo; Rui, Yicheng; Xuan, Yifan +1 more
Hidden within the Gaia satellite's multiple data releases lies a valuable cache of dark companions. To facilitate the efficient and reliable detection of these companions via combined analyses involving the Gaia, Hipparcos, and Tycho-2 catalogs, we introduce an astrometric modeling framework. This method incorporates analytical least-square minimi…
Discovery of a Bow-shock Nebula Around the Z Cam-type Cataclysmic Variable SY Cancri
Bond, Howard E.; Talbot, Jonathan; Carter, Calvin +3 more
We report the serendipitous discovery of a bow-shock nebula around the cataclysmic variable (CV) SY Cancri. In addition, SY Cnc lies near the edge of a faint Hα-emitting nebula with a diameter of about
Spatial distribution of plasma density and magnetic field amplitude in the dayside magnetosheath as a function of the IMF orientation
Lavraud, B.; Génot, V.; Jeandet, A. +5 more
The properties of the magnetosheath are of pivotal importance in determining the coupling between the magnetosphere and interplanetary medium. In particular, the magnetic flux pileup and plasma depletion layer (PDL) modify the boundary conditions of magnetopause reconnection. However, the spatial distribution of the magnetic field strength and pla…
Long Term X-Ray Spectral Variations of the Seyfert-1 Galaxy Mrk 279
Jeena, K.; Misra, Ranjeev; Akhila, K. +1 more
We present the results from a long term X-ray analysis of Mrk 279 during the period 2018–2020. We use data from multiple missions – AstroSat, NuSTAR and XMM-Newton, for the purpose. The X-ray spectrum can be modeled as a double Comptonization along with the presence of neutral Fe Kα line emission, at all epochs. We determined the source's X-ray fl…
Near-infrared Spectroscopy of the Sun and Solar Analog Star HD 76151: Compiling an Extensive Line List in the Y, J, H, and K Bands
Bilir, Selçuk; Şahin, Timur; Şentürk, Sena Aleyna +2 more
Determining the physical nature of a star requires precise knowledge of its stellar atmospheric parameters, including effective temperature, surface gravity, and metallicity. This study presents a new atomic line list covering a broad spectral range (1–2.5 µm; YJHK bands) for iron (Fe) and α-elements (Ca, Mg, Ti, Si) to improve stellar param…
Millinovae: A New Class of Transient Supersoft X-Ray Sources without a Classical Nova Eruption
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +18 more
Some accreting binary systems containing a white dwarf (such as classical novae or persistent supersoft sources) are seen to emit low-energy X-rays with temperatures of ∼ 106 K and luminosities exceeding 1035 erg s‑1. These X-rays are thought to originate from nuclear burning on the white dwarf surface, either caus…