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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…
Strong He I Emission Lines in High N/O Galaxies at z ∼ 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +14 more
We present He I/Hβ flux and He/H abundance ratios in three James Webb Space Telescope galaxies with significant constraints on N/O abundance ratios, GS-NDG-9422, RXCJ2248-ID, and GLASS150008 at z ∼ 6 mostly with the spectroscopic coverage from He I λ4471 and He II λ4686 to He I λ7065, and comparing with 68 local dwarf galaxies. We find that these …
Masses, revised radii, and a third planet candidate in the 'Inverted' planetary system around TOI-1266
Knutson, Heather; Vanderburg, Andrew; López-Morales, Mercedes +40 more
Is the population of close-in planets orbiting M dwarfs sculpted by thermally driven escape or is it a direct outcome of the planet formation process? A number of recent empirical results strongly suggest the latter. However, the unique architecture of the TOI-1266 system presents a challenge to models of planet formation and atmospheric escape gi…
CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE
Feng, Xiaotong; Wolf, Christian; Bouwens, R. J. +17 more
A complete and pure sample of quasars with accurate redshifts is crucial for quasar studies and cosmology. In this paper, we present CatNorth, an improved Gaia Data Release 3 (Gaia DR3) quasar candidate catalog with more than 1.5 million sources in the 3π sky built with data from Gaia, Pan-STARRS1, and CatWISE2020. The XGBoost algorithm is used to…