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Evidence for morning-to-evening limb asymmetry on the cool low-density exoplanet WASP-107 b
Fortney, Jonathan J.; Bell, Taylor J.; Line, Michael R. +8 more
The atmospheric properties of hot exoplanets are expected to be different between the morning and the evening limbs due to their global atmospheric circulation. Ground-based observations at high spectral resolution have detected this limb asymmetry in several ultra-hot (>2,000 K) exoplanets, but the prevalence of the phenomenon in the broader e…
New Measurements of the Lyα Forest Continuum and Effective Optical Depth with LyCAN and DESI Y1 Data
Juneau, S.; Moustakas, J.; Brooks, D. +42 more
We present the Lyα Continuum Analysis Network (LyCAN), a convolutional neural network that predicts the unabsorbed quasar continuum within the rest-frame wavelength range of 1040–1600 Å based on the red side of the Lyα emission line (1216–1600 Å). We developed synthetic spectra based on a Gaussian mixture model representation of nonnegative matrix…
Thermonuclear explosions on neutron stars reveal the speed of their jets
Kuulkers, Erik; Degenaar, Nathalie; Sánchez-Fernández, Celia +6 more
Relativistic jets are observed from accreting and cataclysmic transients throughout the Universe, and have a profound impact on their surroundings1,2. Despite their importance, their launch mechanism is not known. For accreting neutron stars, the speed of their compact jets can reveal whether the jets are powered by magnetic fields anch…
The sizes of bright Lyman-break galaxies at z ≃ 3-5 with JWST PRIMER
Bowler, R. A. A.; Dunlop, J. S.; Koekemoer, A. M. +8 more
We use data from the JWST Public Release IMaging for Extragalactic Research survey to measure the size scaling relations of 1668 rest-frame UV-bright Lyman-break galaxies (LBGs) at
Estimating the absolute parameters of W UMa-type binary stars using Gaia DR3 parallax
Poro, Atila; Nourmohammad, Mahshid; Hedayatjoo, Mahya +7 more
The accuracy of absolute parameters' estimation in contact binary systems is important for investigating their evolution and solving some challenges. The Gaia DR3 parallax is one of the methods used for estimating the absolute parameters, in cases where photometric data is the only one that is available. The use of this method includes advantages …
Feedback and ionized gas outflows in four low-radio power AGN at z ∼ 0.15
Maiolino, R.; Treister, E.; Tomicic, N. +19 more
An increasing number of observations and simulations suggests that low-power (< 1044 erg s−1) jets may be a significant channel of feedback produced by active galactic nuclei (AGN), but little is known about their actual effect on their host galaxies from the observational point of view. We targeted four luminous type 2 AG…
Most nearby young star clusters formed in three massive complexes
Reffert, Sabine; Meingast, Stefan; Alves, João +9 more
Efforts to unveil the structure of the local interstellar medium and its recent star-formation history have spanned the past 70 years (refs. 1-6). Recent studies using precise data from space astrometry missions have revealed nearby, newly formed star clusters with connected origins7-12. Nonetheless, mapping young clusters ac…
Spectroscopic Confirmation of an Ultra-Massive Galaxy in a Protocluster at z ∼ 4.9
Cooper, M. C.; Urbano Stawinski, Stephanie M.; Muzzin, Adam +8 more
We present spectroscopic confirmation of an ultra-massive galaxy (UMG) with log(M⋆/M⊙)=10.98±0.07 at zspec=4.8947 in the Extended Groth Strip (EGS), based on deep observations of Ly α emission with Keck/DEIMOS. The ultra-massive galaxy (UMG-28740) is the most massive member in one of the most significant overdensities in the EGS, with four additio…
Magnetic Reconnection at Planetary Bodies and Astrospheres
Stawarz, Julia E.; Phan, Tai D.; Harada, Yuki +11 more
Magnetic reconnection is a fundamental mechanism for the transport of mass and energy in planetary magnetospheres and astrospheres. While the process of reconnection is itself ubiquitous across a multitude of systems, the techniques used for its analysis can vary across scientific disciplines. Here we frame the latest understanding of reconnection…
Chemical Diversity on Small Scales: Abundance Analysis of the Tucana V Ultrafaint Dwarf Galaxy
Li, Ting S.; Hansen, Terese T.; Simon, Joshua D. +5 more
The growing number of Milky Way satellites detected in recent years has introduced a new focus for stellar abundance analysis. Abundances of stars in satellites have been used to probe the nature of these systems and their chemical evolution. However, for most satellites, only centrally located stars have been examined. This paper presents an anal…