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Influence of Large-scale Interplanetary Structures on the Propagation of Solar Energetic Particles: The Multispacecraft Event on 2021 October 9
Lario, D.; Palmerio, E.; Vainio, R. +18 more
An intense solar energetic particle (SEP) event was observed on 2021 October 9 by multiple spacecraft distributed near the ecliptic plane at heliocentric radial distances R ≲ 1 au and within a narrow range of heliolongitudes. A stream interaction region (SIR), sequentially observed by Parker Solar Probe (PSP) at R = 0.76 au and 48° east from Earth…
The global distribution and morphologic characteristics of fan-shaped sedimentary landforms on Mars
Wilson, Sharon A.; Howard, Alan D.; Morgan, Alexander M.
Fan-shaped sedimentary landforms on Mars are important geomorphic markers of past water flow and characterizing the distribution and morphology of these features can yield insights into the planet's climatic evolution. We present a new database of 1501 martian fan-shaped sedimentary landforms that builds upon previous surveys and uses Context Came…
Von Zeipel - Lidov - Kozai cycles in action: Kepler triples with eclipse depth variations: KICs 6964043, 5653126, 5731312, and 8023317
Mitnyan, T.; Moe, M.; Toonen, S. +3 more
We report the results of the photodynamical analyses of four compact, tight triple stellar systems, KICs 6964043, 5653126, 5731312, and 8023317, based largely on Kepler and TESS data. All systems display remarkable eclipse timing and eclipse depth variations, the latter implying a non-aligned outer orbit. Moreover, KIC 6964043 is also a triply ecl…
High-resolution ALMA Study of CO J = 2-1 Line and Dust Continuum Emissions in Cluster Galaxies at z = 1.46
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +11 more
We present new Atacama Large Millimeter/submillimeter Array (ALMA) results obtained from spatially resolved CO J = 2-1 line (0.″4 resolution) and 870 µm continuum (0.″2 resolution) observations of cluster galaxies in XMMXCS J2215.9-1738 at z = 1.46. Our sample comprises 17 galaxies within ~0.5 Mpc (0.6R 200) of the cluster center,…
Kepler-1656b's Extreme Eccentricity: Signature of a Gentle Giant
Howard, Andrew W.; Angelo, Isabel; Naoz, Smadar +4 more
Highly eccentric orbits are one of the major surprises of exoplanets relative to the solar system and indicate rich and tumultuous dynamical histories. One system of particular interest is Kepler-1656, which hosts a sub-Jovian planet with an eccentricity of 0.8. Sufficiently eccentric orbits will shrink in the semimajor axis due to tidal dissipati…
Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44
Koester, D.; Zuckerman, B.; Jura, M. +3 more
Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal 10 elements heavier than helium: C, N, O, Mg, Al, Si, P, S, Ca, and Fe. G238-44 is only the third white dwarf with nitrogen detected in its atmosphere from polluting planetary system material. K…
The post-common-envelope binary central star of the planetary nebula Ou 5: a doubly eclipsing post-red-giant-branch system
Corradi, Romano L. M.; Parsons, Steven G.; Munday, James +10 more
We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou 5. Low-resolution spectra obtained during the primary eclipse - to our knowledge the first isolated spectra of the companion to a post-common-envelope planetary nebula central star - were compared to catalogu…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XII. Ionised gas emission in the inner regions of lenticular galaxies
Andreani, P.; Ferrarese, L.; Buat, V. +24 more
As part of the Virgo Cluster Survey Tracing Ionised Gas Emission, a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT, we discovered eight massive (1010 ≲ Mstar ≲ 1011 M⊙) lenticular galaxies with prominent ionised gas emission features in their inner (a …
Moderate-resolution K-band Spectroscopy of the Substellar Companion VHS 1256 b
Macintosh, Bruce; Perrin, Marshall D.; Barman, Travis S. +6 more
We present moderate-resolution (R ~ 4000) K-band spectra of the planetary-mass companion VHS 1256 b. The data were taken with the OSIRIS integral field spectrograph at the W.M. Keck Observatory. The spectra reveal resolved molecular lines from H2O and CO. The spectra are compared to custom PHOENIX atmosphere model grids appropriate for …
MINCE. I. Presentation of the project and of the first year sample
Hansen, C. J.; Bonifacio, P.; Caffau, E. +20 more
Context. In recent years, Galactic archaeology has become a particularly vibrant field of astronomy, with its main focus set on the oldest stars of our Galaxy. In most cases, these stars have been identified as the most metal-poor. However, the struggle to find these ancient fossils has produced an important bias in the observations - in particula…