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The First Photometric Study of AH Mic Contact Binary System
Poro, Atila; Blackford, M. G.; Ranjbar Salehian, S. +7 more
The first multi-color light curve analysis of the AH Mic binary system is presented. This system has very few past observations from the southern hemisphere. We extracted the minima times from the light curves based on the Markov Chain Monte Carlo (MCMC) approach and obtained a new ephemeris. To provide modern photometric light curve solutions, we…
Contribution of flows around active regions to the north-south helioseismic travel-time measurements
Gizon, L.; Poulier, P. -L.; Liang, Z. -C. +1 more
Context. In local helioseismology, the travel times of acoustic waves propagating in opposite directions along the same meridian inform us about horizontal flows in the north-south direction. The longitudinal averages of the north-south helioseismic travel-time shifts vary with the sunspot cycle.
Aims: We aim to study the contribution of infl…
Study of the X-ray Pulsar IGR J21343+4738 Based on NuSTAR, Swift, and SRG Data
Lutovinov, A. A.; Molkov, S. V.; Semena, A. N. +1 more
We present the results of our study of the X-ray pulsar IGR J21343+4738 based on NuSTAR, Swift, and SRG observations in the wide energy range 0.3-79 keV. The absence of absorption features in the energy spectra of the source, both averaged and phase-resolved ones, has allowed us to estimate the upper and lower limits on the magnetic field of the n…
Variability of the Sun's Luminosity Places Constraints on the Thermal Equilibrium of the Convection Zone
Dudok de Wit, T.; Vieira, L. E. A.; Kopp, G. +5 more
Luminosity, which is the total amount of radiant energy emitted by an object, is one of the most critical quantities in astrophysics for characterizing stars. Equally important is the temporal evolution of a star's luminosity because of its intimate connection with the stellar energy budget, large-scale convective motion, and heat storage in the s…
Cold Atom Interferometry for Enhancing the Radio Science Gravity Experiment: A Phobos Case Study
Dirkx, Dominic; Plumaris, Michael; Siemes, Christian +1 more
Interplanetary missions have typically relied on Radio Science (RS) to recover gravity fields by detecting their signatures on the spacecraft trajectory. The weak gravitational fields of small bodies, coupled with the prominent influence of confounding accelerations, hinder the efficacy of this method. Meanwhile, quantum sensors based on Cold Atom…
A new insight of AGC 198691 (Leoncino) galaxy with MEGARA at the GTC
Castillo-Morales, A.; Gallego, J.; Mollá, M. +9 more
We describe the observations of the low metallicity nearby galaxy AGC 198691 (Leoncino Dwarf) obtained with the Integral Field Unit of the instrument MEGARA at the Gran Telescopio Canarias. The observations cover the wavelength ranges 4304-5198 Å and 6098-7306 Å with a resolving power R ≈ 6000. We present 2D maps of the ionized gas, deriving the e…
The Shellless Supernova Remnant B0532-67.5 in the Large Magellanic Cloud
Chu, You-Hua; Li, Chuan-Jui; Chuang, Chen-Yu +1 more
The supernova remnant (SNR) B0532-67.5 in the Large Magellanic Cloud (LMC) was first diagnosed by its nonthermal radio emission, and its SNR nature was confirmed by the observation of diffuse X-ray emission; however, no optical SNR shell is detected. The OB association LH75, or NGC 2011, is projected within the boundary of this SNR. We have analyz…
The hierarchical structure of galactic haloes: generalized N-dimensional clustering with C LUSTAR-ND
Lewis, Geraint F.; Oliver, William H.; Elahi, Pascal J.
We present C LUSTAR-ND, a fast hierarchical galaxy/(sub)halo finder that produces Clustering Structure via Transformative Aggregation and Rejection in N-Dimensions. It is designed to improve upon H ALO-OPTICS - an algorithm that automatically detects and extracts significant astrophysical clusters from the 3D spatial positions of simulation partic…
Convolutional Neural Networks for Searching Superflares from Pixel-level Data of the Transiting Exoplanet Survey Satellite
Tu, Zuo-Lin; Wang, F. Y.; Wu, Qin +3 more
In this work, six convolutional neural networks (CNNs) have been trained based on 15,638 superflare candidates on solar-type stars, which are collected from the three years of Transiting Exoplanet Survey Satellite (TESS) observations. These networks are used to replace the manually visual inspection, which was a direct way of searching for superfl…
Illuminating the Motions of Jupiter's Auroral Dawn Storms
Nichols, J. D.; Rutala, M. J.; Clarke, J. T. +1 more
Jupiter's auroral main emission (ME) has long been considered to be the result of currents keeping plasma corotating with the surrounding magnetosphere. As a result, the ME corotates with the planet, and individual auroral features making up the ME roughly follow suit. Jupiter's dawn storms, some of the rarest and brightest auroral features within…