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Suzaku spectral analysis of an X-ray emitting plasma in the supernova remnant G352.7-0.1
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo +1 more
The results of a Suzaku observation of the supernova remnant (SNR) G352.7-0.1 are presented in this paper. We conducted spectral analysis based on careful sky background estimation and found an emission line from Al at 1.6 keV, in addition to previously detected emission lines from Mg, Si, S, Ar, Ca, and Fe ions. The X-ray spectrum in the 0.7-10 k…
Machine learning methods for the search for L&T brown dwarfs in the data of modern sky surveys
Avdeeva, A.
According to various estimates, brown dwarfs (BD) should account for up to 25 percent of all objects in the Galaxy. However, few of them are discovered and well-studied, both individually and as a population. Homogeneous and complete samples of brown dwarfs are needed for these kinds of studies. Due to their weakness, spectral studies of brown dwa…
Three-dimensional Orbit of AC Her Determined: Binary-induced Truncation Cannot Explain the Large Cavity in This Post-AGB Transition Disk
Klement, Robert; Mérand, Antoine; Monnier, John D. +17 more
Some evolved binaries, namely post-asymptotic giant branch (AGB) binaries, are surrounded by stable and massive circumbinary disks similar to protoplanetary disks found around young stars. Around 10% of these disks are transition disks: they have a large inner cavity in the dust. Previous interferometric measurements and modeling have ruled out th…
The truncation of the disk of NGC 4565. Detected up to z = 4 kpc, with star formation, and affected by the warp
Trujillo, Ignacio; Borlaff, Alejandro S.; Comerón, Sébastien +5 more
Context. The hierarchical model of galaxy formation suggests that galaxies are continuously growing. However, our position inside the Milky Way prevents us from studying the disk edge. Truncations are low surface brightness features located in the disk outskirts of external galaxies. They indicate where the disk brightness abruptly drops, and thei…
Remote Sensing and Data Analyses on Planetary Topography
Lin, Shih-Yuan; Xiao, Haifeng; Kim, Jungrack
Planetary mapping product established by topographic remote sensing is one of the most significant achievements of contemporary technology. Modern planetary remote sensing technology now measures the topography of familiar solid planets/satellites such as Mars and the Moon with sub-meter precision, and its applications extend to the Kuiper Belt of…
Discovering New B[e] Supergiants and Candidate Luminous Blue Variables in Nearby Galaxies
Bonanos, Alceste Z.; Maravelias, Grigoris; Tramper, Frank +3 more
Mass loss is one of the key parameters that determine stellar evolution. Despite the progress we have achieved over the last decades we still cannot match the observational derived values with theoretical predictions. Even worse, there are certain phases, such as the B[e] supergiants (B[e]SGs) and the Luminous Blue Variables (LBVs), where signific…
Metallicity and Spectral Evolution of WASP 39b: The Limited Role of Hydrodynamic Escape
Miguel, Yamila; Kubyshkina, Daria; Louca, Amy J.
The recent observations on WASP-39 b by JWST have revealed hints of high metallicity within the atmosphere compared to its host star. There are various theories on how these high metallic atmospheres emerge. In this study, we closely investigate the impact of extreme escape in the form of hydrodynamic escape to see its impact on atmospheric metall…
Smoke on the wind: dust nucleation in the archetype colliding-wind pinwheel WR 104
Millour, F.; Lau, R. M.; Soulain, A. +2 more
A handful of binary Wolf-Rayet stars are known to harbour spectacular spiral structures spanning a few hundred astronomical units. These systems host some of the highest dust production rates in the Universe and are therefore interesting candidates for addressing the origin of the enigmatic dust excess observed across galactic evolution. The subst…
An XMM-Newton View of the Andromeda Galaxy as Explored in a Legacy Survey (New-ANGELS). I. The X-Ray Source Catalog
Bregman, Joel N.; Zhang, Yi; Wang, Q. Daniel +6 more
We introduce the New-ANGELS program, an XMM-Newton survey of a ~7.2 deg2 area around M31, which aims to study the X-ray populations in the M31 disk and the X-ray-emitting hot gas in the inner halo of M31 up to 30 kpc. In this first paper, we report the catalog of 4506 detected X-ray sources and attempt to cross-identify or roughly class…
Kinetic Alfvén Waves Excited by Multiple Free Energy Sources in the Magnetotail
Lakhina, G. S.; Singh, S. V.; Barik, K. C.
The generation of kinetic Alfvén waves (KAWs) is investigated through a three-component theoretical model incorporating ion beam and velocity shear as the sources of free energy in a non-Maxwellian κ-distributed plasmas. The model considers Maxwellian distributed background ions, drifting-Maxwellian beam ions, and κ-electrons as its constituent sp…