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Quantifying the Transit Light Source Effect: Measurements of Spot Temperature and Coverage on the Photosphere of AU Microscopii with High-resolution Spectroscopy and Multicolor Photometry
Wakeford, Hannah R.; Mann, Andrew W.; Plavchan, Peter +5 more
AU Microscopii (AU Mic) is an active 24 ± 3 Myr pre-main-sequence M dwarf in the stellar neighborhood (d = 9.7 pc) with a rotation period of 4.86 days. The two transiting planets orbiting AU Mic, AU Mic b and c, are warm sub-Neptunes on 8.5 and 18.9 day periods and are targets of interest for atmospheric observations of young planets. Here we stud…
Discovery of a one-sided radio filament of PSR J0538+2817 in S147: escape of relativistic PWN leptons into surrounding supernova remnant?
Churazov, E. M.; Khabibullin, I. I.; Bykov, A. M. +2 more
We report the discovery of a faint radio filament near PSR J0538+2817 in the NVSS, CGPS, and the Rapid ASKAP Continuum Survey data. This pulsar is plausibly associated with the supernova that gave rise to the Spaghetti nebula (Simeis 147). The structure is one-sided and appears to be almost aligned (within 17 degrees) with the direction of the pul…
Heterogeneous outgassing regions identified on active centaur 29P/Schwassmann–Wachmann 1
Schambeau, Charles A.; Villanueva, Geronimo L.; Faggi, Sara +11 more
Centaurs are transitional objects between primitive trans-Neptunian objects and Jupiter-family comets. Their compositions and activities provide fundamental clues regarding the processes affecting the evolution of and interplay between these small bodies. Here we report observations of centaur 29P/Schwassmann–Wachmann 1 (29P) with the James Webb S…
Astroparticles from X-Ray Binary Coronae
Gallagher, John S.; Fang, K.; Halzen, Francis +1 more
The recent observation of high-energy neutrinos from the Galactic plane implies an abundant population of hadronic cosmic-ray sources in the Milky Way. We explore the role of the coronae of accreting stellar-mass black holes as such astroparticle emitters. We show that the particle acceleration and interaction timescales in the coronal region are …
Filament Eruption from Active Region 13283 Leading to a Fast Halo-CME and an Intense Geomagnetic Storm on 2023 April 23
Vemareddy, P.
Using multi-instrument and multiwavelength observations, we studied a coronal mass ejection (CME) that led to an intense geomagnetic storm on 2023 April 23. The eruption occurred on April 21 in solar active region (AR) 13283 near the disk center. The AR was in its decay stage, with fragmented polarities and a preexisting long filament channel a fe…
A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations
Fu, Guangwei; Stevenson, Kevin B.; Bieryla, Allyson +49 more
Kepler-51 is a ≲1 Gyr old Sun-like star hosting three transiting planets with radii ≈6–9 R ⊕ and orbital periods ≈45–130 days. Transit timing variations (TTVs) measured with past Kepler and Hubble Space Telescope (HST) observations have been successfully modeled by considering gravitational interactions between the three transiting plan…
Transverse clues on the kiloparsec-scale structure of the circumgalactic medium as traced by C IV absorption
Bayliss, M. B.; Lopez, S.; Tejos, N. +13 more
The kiloparsec-scale kinematics and density structure of the circumgalactic medium (CGM) is still poorly constrained observationally, which poses a problem for understanding the role of the baryon cycle in galaxy evolution. Here we present VLT/MUSE integral-field spectroscopy (R ≈ 1800) of four giant gravitational arcs exhibiting W0 ≳ 0…
Fine structure in the Sigma Orionis cluster revealed by Gaia DR3
Martín, E. L.; Žerjal, M.; Pérez-Garrido, A.
Context. Sigma Orionis is an open cluster in the nearest giant star formation site - Orion. Its youth (3−5 Myr), low reddening, and relative vicinity make it an important benchmark cluster to study stellar and substellar formation and evolution.
Aims: Young star-forming sites are complex and hierarchical. Precision astrometry from Gaia DR3 en…
Methodological refinement of the submillimeter galaxy magnification bias. I. Cosmological analysis with a single redshift bin
Bonavera, L.; González-Nuevo, J.; Lapi, A. +3 more
Aims: The main goal of this work is to test the results of a methodological improvement in the measurement of the magnification bias signal on a sample of submillimeter galaxies. In particular, we investigate the constraining power of cosmological parameters within the ΛCDM model. We also discuss important points that can affect the results. …
Insights into the Galactic Bulge Chemodynamical Properties from Gaia Data Release 3
Marinacci, Federico; Fragkoudi, Francesca; Shen, Juntai +4 more
We explore the chemodynamical properties of the Galaxy in the azimuthal velocity V ϕ and metallicity [Fe/H] space using red giant stars from Gaia Data Release 3. The row-normalized V ϕ –[Fe/H] maps form a coherent sequence from the bulge to the outer disk, clearly revealing the thin/thick disk and the Splash. The metal-ric…