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The Temporal Brightening of Uranus' Northern Polar Hood From HST/WFC3 and HST/STIS Observations
Wong, Michael H.; Fletcher, Leigh N.; Irwin, Patrick G. J. +8 more
Hubble Space Telescope Wide-Field Camera 3 (HST/WFC3) observations spanning 2015 to 2021 confirm a brightening of Uranus' north polar hood feature with time. The vertical aerosol model of Irwin et al. (2023, https://doi.org/10.1038/s41550-023-02047-0) (IRW23), consisting of a deep haze layer…
The Accretion History of AGN: The Spectral Energy Distributions of X-Ray-luminous Active Galactic Nuclei
Kirkpatrick, Allison; Koss, Michael; Boquien, Médéric +17 more
Spectral energy distributions (SEDs) from X-ray to far-infrared (FIR) wavelengths are presented for a sample of 1246 X-ray-luminous active galactic nuclei (AGNs; L 0.5-10 keV > 1043 erg s-1), with z spec < 1.2, selected from Stripe 82X, COSMOS, and GOODS-N/S. The rest-frame SEDs show a wide spread …
A Survey of Herbig Ae/Be Multiplicity
Bouvier, J.; Beuzit, J. -L.; Thomas, S. J. +5 more
Although the majority of Herbig Ae/Be (HAEBE) stars are likely multiple systems, relatively few multiples have been identified. We aim to create a statistically significant survey of HAEBE multiplicity as a function of stellar mass, to shed light on mixed-mass star formation. Two independent adaptive optics IR imaging surveys were conducted, betwe…
The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
Sana, Hugues; Bowman, Dominic M.; Aerts, Conny +7 more
Context. Modern stellar structure and evolution theory suffers from a lack of observational calibration for the interior physics of intermediate- and high-mass stars. This leads to discrepancies between theoretical predictions and observed phenomena that are mostly related to angular momentum and element transport. Analyses of large samples of mas…
Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable δ Sct star HD 340577 and a null result for the γ Dor star HR 8799
Ilyin, I.; Hubrig, S.; Schöller, M. +2 more
Numerous δ Sct and γ Dor pulsators are identified in the region of the Hertzsprung-Russell diagram that is occupied by chemically peculiar magnetic Ap stars. The connection between δ Sct and γ Dor pulsations and the magnetic field in Ap stars is however not clear: theory suggests for magnetic Ap stars some critical field strengths for pulsation mo…
Degree of stochastic asymmetry in the tidal tails of star clusters
Prusti, T.; Beccari, G.; Boffin, H. M. J. +4 more
Context. Tidal tails of star clusters are commonly understood to be populated symmetrically. Recently, the analysis of Gaia data revealed large asymmetries between the leading and trailing tidal tail arms of the four open star clusters Hyades, Praesepe, Coma Berenices, and NGC 752.
Aims: As the evaporation of stars from star clusters into the…
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues
Langevin, Yves; Poulet, François; Perna, Davide +12 more
Mercury's peculiar orbit around the Sun (3:2 spin-orbit resonance) and lack of atmosphere result in one the widest temperature ranges experienced at the surface of a planetary body in the solar system. Temperature variations affect the physical and, therefore, spectral properties of minerals to varying degrees; thus, it is crucial to study them in…
Martian Ozone Observed by TGO/NOMAD-UVIS Solar Occultation: An Inter-Comparison of Three Retrieval Methods
Aoki, S.; Vandaele, A. C.; Daerden, F. +16 more
The NOMAD-UVIS instrument on board the ExoMars Trace Gas Orbiter has been investigating the Martian atmosphere with the occultation technique since April 2018. Here, we analyze almost two Mars Years of ozone vertical distributions acquired at the day-night terminator. The ozone retrievals proved more difficult than expected due to spurious detecti…
Spatially resolved properties of the ionized gas in the H II galaxy J084220+115000
Terlevich, E.; Terlevich, R.; Bresolin, F. +20 more
We present a spatially resolved spectroscopic study for the metal poor H II galaxy J084220+115000 using MEGARA Integral Field Unit observations at the Gran Telescopio Canarias. We estimated the gas metallicity using the direct method for oxygen, nitrogen, and helium and found a mean value of 12 + log (O/H) = 8.03 ± 0.06, and integrated electron de…
The redshift evolution of the S0 fraction for z < 1 in COSMOS
Bekki, Kenji; Groves, Brent A.; Cavanagh, Mitchell K.
Lenticular (S0) galaxies are galaxies that exhibit a bulge and disc component, yet lack any clear spiral features. With features considered intermediary between spirals and ellipticals, S0s have been proposed to be a transitional morphology, however their exact origin and nature is still debated. In this work, we study the redshift evolution of th…