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Are lithium-rich giants binaries? A radial velocity variability analysis of 1400 giants
Aguilera-Gómez, Claudia; Chanamé, Julio; Castro-Tapia, Matias
Context. The existence of low-mass giants with large amounts of lithium (Li) in their surfaces has challenged stellar evolution for decades. One of the possibilities usually discussed in the literature to explain these Li-rich giants involves the interaction with a close binary companion, a scenario that predicts that, when compared against their …
Toward a Self-consistent Evaluation of Gas Dwarf Scenarios for Temperate Sub-Neptunes
Madhusudhan, Nikku; Constantinou, Savvas; Moses, Julianne I. +6 more
The recent JWST detections of carbon-bearing molecules in a habitable-zone sub-Neptune have opened a new era in the study of low-mass exoplanets. The sub-Neptune regime spans a wide diversity of planetary interiors and atmospheres not witnessed in the solar system, including mini-Neptunes, super-Earths, and water worlds. Recent works have investig…
Effects of galaxy environment on merger fraction
White, G. J.; Małek, K.; Serjeant, S. +13 more
Aims: In this work we examine how environment influences the merger fraction, from the low density field environment to higher density groups and clusters. We also study how the properties of a group or cluster, as well as the position of a galaxy in the group or cluster, influences the merger fraction.
Methods: We identified galaxy grou…
The ALMA-CRISTAL Survey: Spatially Resolved Star Formation Activity and Dust Content in 4 < z < 6 Star-forming Galaxies
Förster Schreiber, N. M.; Übler, Hannah; Ferrara, Andrea +28 more
Using a combination of Hubble Space Telescope (HST), JWST, and Atacama Large Millimeter/submillimeter Array (ALMA) data, we perform spatially resolved spectral energy distributions (SED) fitting of fourteen 4 < z < 6 ultraviolet (UV)-selected main-sequence galaxies targeted by the ALMA Large Program [C II] Resolved ISM in Star-forming Galaxi…
Hunting for Polluted White Dwarfs and Other Treasures with Gaia XP Spectra and Unsupervised Machine Learning
Montgomery, M. H.; Winget, D. E.; Hawkins, Keith +5 more
White dwarfs (WDs) polluted by exoplanetary material provide the unprecedented opportunity to directly observe the interiors of exoplanets. However, spectroscopic surveys are often limited by brightness constraints, and WDs tend to be very faint, making detections of large populations of polluted WDs difficult. In this paper, we aim to increase co…
Flux Rope Modeling of the 2022 September 5 Coronal Mass Ejection Observed by Parker Solar Probe and Solar Orbiter from 0.07 to 0.69 au
Hess, Phillip; Long, David M.; Möstl, Christian +19 more
As both Parker Solar Probe (PSP) and Solar Orbiter (SolO) reach heliocentric distances closer to the Sun, they present an exciting opportunity to study the structure of coronal mass ejections (CMEs) in the inner heliosphere. We present an analysis of the global flux rope structure of the 2022 September 5 CME event that impacted PSP at a heliocentr…
X-Ray Polarization of the Eastern Lobe of SS 433
Ingram, Adam; Safi-Harb, Samar; Kaaret, Philip +103 more
How astrophysical systems translate the kinetic energy of bulk motion into the acceleration of particles to very high energies is a pressing question. SS 433 is a microquasar that emits TeV γ-rays indicating the presence of high-energy particles. A region of hard X-ray emission in the eastern lobe of SS 433 was recently identified as an accelerati…
Multi-iron subpopulations in Liller 1 from high-resolution H-band spectroscopy
Dalessandro, E.; Rich, R. M.; Fanelli, C. +7 more
We present a high-resolution chemical study of a representative sample of 21 luminous giant stars in Liller 1, a complex stellar system in the Galactic bulge, based on H-band spectra acquired with the Near-Infrared Spectrograph at KeckII. In this sample, we found fifteen stars with a subsolar iron abundance and enhanced [α/Fe] and [Al/Fe], likely …
Spectroscopic survey of faint planetary-nebula nuclei. III. A [WC] central star and two new PG1159 nuclei
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
We present spectroscopy of three hydrogen-deficient central stars of faint planetary nebulae, with effective temperatures (Teff) in excess of 100 000 K. The nucleus of RaMul 2 is a Population II Wolf-Rayet star of spectral type [WC], and the central stars of Abell 25 and StDr 138 are two new members of the PG1159 class. Our spectral ana…
LOFAR high-band antenna observations of the Perseus cluster: The discovery of a giant radio halo
Brunetti, G.; Shimwell, T. W.; Gastaldello, F. +13 more
The Perseus cluster is the brightest X-ray cluster in the sky and is known as a cool-core galaxy cluster. Being a very nearby cluster, it has been extensively studied. This has provided a comprehensive view of the physical processes that operate in the intracluster medium (ICM), including feedback from the active galactic nucleus (AGN) 3C 84 and m…