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Candidate RR Lyrae Associated with the Ultrafaint Dwarf Galaxy Aquarius III
Ngeow, Chow-Choong; Bhardwaj, Anupam
We report the search of RR Lyrae in the vicinity of a newly discovered ultrafaint dwarf galaxy, Aquarius III. Based on the known RR Lyrae catalogs and gri-band light curves retrieved from public archives, we identified a RR Lyrae with distance, metallicity, and proper motion consistent with Aquarius III. Therefore, this RR Lyrae is the first varia…
Hertzsprung gap stars in nearby galaxies and the quest for luminous red nova progenitors
Blagorodnova, Nadejda; van Roestel, Jan; Vreeswijk, Paul M. +5 more
Context. After the main sequence phase, stars more massive than 2.5 M⊙ rapidly evolve through the Hertzsprung gap as yellow giants and yellow supergiants (YSGs) before settling into the red giant branch. Identifying Hertzsprung gap stars in nearby galaxies is crucial for pinpointing progenitors of luminous red novae (LRNe) – astrophysic…
A coronal mass ejection encountered by four spacecraft within 1 au from the Sun: ensemble modelling of propagation and magnetic structure
Al-Haddad, Nada; Riley, Pete; Richter, Ingo +11 more
Understanding and predicting the structure and evolution of coronal mass ejections (CMEs) in the heliosphere remains one of the most sought-after goals in heliophysics and space weather research. A powerful tool for improving current knowledge and capabilities consists of multispacecraft observations of the same event, which take place when two or…
A Maia-type candidate was misclassified: V424 Cep is an eclipsing β Cep-type pulsator in a triple system
Schmutz, W.; Koenigsberger, G.; Richer, M. G. +2 more
Context. V424 Cephei is an eclipsing binary system that has been classified as a Maia variable candidate. These objects are pulsators that apparently lie outside the theoretical instability strips. Aims. We determine the properties of V424 Cep and identify the nature of the pulsating variable. Methods. We analyzed photometric data obtained over th…
Revisiting the Fundamental Planes of Black Hole Activity for Strong Jet Sources
Long, Qing-Chen; Dong, Ai-Jun; Zhi, Qi-Jun +1 more
Whether the X-ray emissions of strong jet sources originate from disk+coronas or jets is still controversial. In this work, we constructed a strong jet sample containing 50 flat-spectrum radio quasars, 51 low-synchrotron-peaked BL Lac objects, and 18 intermediate-synchrotron-peaked BL Lac objects to explore the origin of X-ray emissions. Generally…
Cooling rate and turbulence in the intracluster medium of the cool-core cluster Abell 2667
Rodighiero, G.; Gastaldello, F.; Tozzi, P. +8 more
Context. We present a detailed analysis of the thermal X-ray emission from the intracluster medium in the cool-core galaxy cluster Abell 2667 at z = 0.23. Aims. Our main goal is to detect low-temperature (< 2 keV) X-ray emitting gas associated with a potential cooling flow connecting the hot intracluster medium reservoir to the cold gas phase r…
NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star
Ramsay, Gavin; Wheatley, Peter J.; Moyano, Maximiliano +22 more
In the last few decades, planet search surveys have been focusing on solar-type stars, and only recently the high-mass regimes. This is mostly due to challenges arising from the lack of instrumental precision, and more importantly, the inherent active nature of fast-rotating massive stars. Here, we report NGTS-33b (TOI-6442b), a super-Jupiter plan…
Fluctuations Driven by Multicomponent Pickup Ion Distributions in the Outer Heliosheath
Roytershteyn, Vadim; Mousavi, Ameneh; Fraternale, Federico +1 more
The stability of a realistic multicomponent pickup ion (PUI) velocity distribution derived from a global model of neutral atoms in the heliosphere, which treats hydrogen and helium atoms self-consistently and includes equations for electrons and helium ions, is investigated using linear instability analysis and hybrid simulations. Linear instabili…
Precise Orbit Determination of Mars-crossing Asteroids
Liu, Xin; Hou, Xi-Yun; Yao, Jun +4 more
This study investigates the orbit determination of the Mars-crossing asteroids (MCAs) with a focus on the possibility of detecting their Yarkovsky signals. We analyze the influences of force model uncertainties on MCA orbits, including the uncertainty of the main asteroid belt, and the uncertainty of the major planets' ephemeris. The main asteroid…
NGTS-EB-7, an eccentric, long-period, low-mass eclipsing binary
Trifonov, Trifon; Henning, Thomas; de Mooij, Ernst J. W. +35 more
Despite being the most common types of stars in the Galaxy, the physical properties of late M dwarfs are often poorly constrained. A trend of radius inflation compared to evolutionary models has been observed for earlier type M dwarfs in eclipsing binaries, possibly caused by magnetic activity. It is currently unclear whether this trend also exten…