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The Fundamental Parameters and Evolutionary Status of V454 Aurigae
Canbay, Remziye; Yucel, Gokhan; Bakis, Volkan
Eclipsing binary systems have a unique feature that enables scientists to obtain precise fundamental star parameters, which opens up a greater area of astrophysics studies. In this study, we derived the fundamental parameters, evolutionary status, and birthplace of V454 Aur in the Galaxy by combining radial velocity, photometric, and spectral ener…
Dust Polarization of Prestellar and Protostellar Sources in OMC-3
Tomisaka, Kohji; Sato, Asako; Ho, Paul T. P. +5 more
We present the Atacama Large Millimeter/submillimeter Array observations of linearly polarized 1.1 mm continuum emission at ∼0.″14 (55 au) resolution and CO (J = 2‑1) emission at ∼1.″5 (590 au) resolution toward one prestellar (MMS 4), four Class 0 (MMS 1, MMS 3, MMS 5, and MMS 6), one Class I (MMS 7), and one flat-spectrum (MMS 2) sources in the …
Light thermal dark matter beyond p-wave annihilation in minimal Higgs portal model
Wu, Lei; Chen, Yu-Tong; Matsumoto, Shigeki +2 more
This study explores a minimal renormalizable dark matter (DM) model, incorporating a sub-GeV Majorana DM and a singlet scalar particle ϕ. Using scalar and pseudo-scalar interactions (couplings cs and cp), we investigate implications for DM detection, considering s-wave, p-wave, and combined (s+p wave) contributions in DM anni…
A cool, magnetic white dwarf accreting planetary debris
Vennes, Stéphane; Weinberger, Alycia J.; Zuckerman, B. +3 more
We present an analysis of spectroscopic data of the cool, highly magnetic, and polluted white dwarf 2MASS J0916-4215. The atmosphere of the white dwarf is dominated by hydrogen, but numerous spectral lines of magnesium, calcium, titanium, chromium, iron, and strontium, along with Li I, Na I, Al I, and K I lines, are found in the incomplete Paschen…
Measurements of the Low-acceleration Gravitational Anomaly from the Normalized Velocity Profile of Gaia Wide Binary Stars and Statistical Testing of Newtonian and Milgromian Theories
Chae, Kyu-Hyun
Low-acceleration gravitational anomaly is investigated with a new method of exploiting the normalized velocity profile
Exploring the ultra-hot Jupiter WASP-178b. Constraints on atmospheric chemistry and dynamics from a joint retrieval of VLT/CRIRES+ and space photometric data
Nagel, E.; Czesla, S.; Nortmann, L. +14 more
Despite recent progress in the spectroscopic characterization of individual exoplanets, the atmospheres of key ultra-hot Jupiters (UHJs) still lack comprehensive investigations. These include WASP-178b, one of the most irradiated UHJs known to date. We observed the dayside emission signal of this planet with CRIRES+ in the spectral K ba…
Detection of pulsed X-ray emission from the isolated neutron star candidate eRASSU J131716.9-402647
Haberl, F.; Pires, A. M.; Schwope, A. D. +1 more
The X-ray source
Unveiling the white dwarf in J191213.72 - 441045.1 through ultraviolet observations
Lyutikov, Maxim; Barkov, Maxim; Pelisoli, Ingrid +7 more
J191213.72 - 441045.1 is a binary system composed of a white dwarf and an M-dwarf in a 4.03-h orbit. It shows emission in radio, optical, and X-ray, all modulated at the white dwarf spin period of 5.3 min, as well as various orbital sideband frequencies. Like in the prototype of the class of radio-pulsing white dwarfs, AR Scorpii, the observed pul…
Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star HIP 39017
Salama, Maïssa; Currie, Thayne; Lewis, Briley L. +23 more
We present the direct-imaging discovery of a substellar companion (a massive planet or low-mass brown dwarf) to the young, γ Doradus (γ Dor)-type variable star HIP 39017 (HD 65526). The companion's SCExAO/CHARIS JHK (1.1–2.4 µm) spectrum and Keck/NIRC2 $L^{\prime} $ photometry indicate that it is an L/T transition object. A comparison of the…
PEARLS: A Potentially Isolated Quiescent Dwarf Galaxy with a Tip of the Red Giant Branch Distance of 30 Mpc
Grogin, Norman A.; Holwerda, Benne W.; Koekemoer, Anton M. +25 more
A wealth of observations have long suggested that the vast majority of isolated classical dwarf galaxies (M * = 107–109 M ⊙) are currently star forming. However, recent observations of the large abundance of "ultra-diffuse galaxies" beyond the reach of previous large spectroscopic surveys suggest that ou…