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Determination of the Venus eddy diffusion profile from CO and CO2 profiles using SOIR/Venus Express observations
Vandaele, A. C.; Robert, S.; Mahieux, A. +6 more
We present a study of the SOIR/Venus Express CO2 and CO profiles in order to constrain the eddy diffusion profile in the Venus mesosphere (80 to 130 km of altitude). We compute the mean number density profile of both species, and the hydrostatic temperature based on the CO2 mean density profile. We use a 1D-photochemical/diff…
Morphology of Jupiter's Polar Auroral Bright Spot Emissions via Juno UVS Observations
Bonfond, B.; Vogt, M. F.; Gérard, J. -C. +12 more
Since 2016, the Juno UVS (Ultraviolet Spectrograph) instrument has been taking spectral images of Jupiter's auroras in their full extent, including the nightside, which cannot be viewed from Earth. We present a systematic analysis of features in Jupiter's polar auroras called auroral bright spots, which were observed by Juno UVS during the first 2…
Preview of Comet C/2021 A1 (Leonard) and Its Encounter with Venus
Zhang, Qicheng; Farnham, Tony L.; Knight, Matthew M. +2 more
Long-period comet C/2021 A1 (Leonard) will approach Venus to within 0.029 au on 2021 December 18 and may subsequently graze the planet with its dust trail less than 2 days later. We observed C/2021 A1 with the Lowell Discovery Telescope on 2021 January 13 and March 3, as well as with the Palomar Hale Telescope on 2021 March 20, while the comet was…
HAT-P-68b: A Transiting Hot Jupiter around a K5 Dwarf Star
Torres, Guillermo; Bieryla, Allyson; Latham, David W. +23 more
We report the discovery by the ground-based Hungarian-made Automated Telescope Network (HATNet) survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 MJ, and radius of 1.072 ± 0.012 RJ. The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K-dwarf st…
The first photometric analysis of the totally eclipsing contact binary V811 Cep
Li, Kai; Gao, Xing; Liu, Yuan +1 more
The first photometric analysis of V811 Cep was carried out. The first complete light curves of V, R and I bands are given. The analysis was carried out by the Wilson-Devinney (W-D) program, and the results show that V811 Cep is a median-contact binary (f = 33.9(±4.9)%) with a mass ratio of 0.285. It is a W-subtype contact binary, that is, the comp…
Constraints on the dust extinction law of the Galaxy with Swift/UVOT, Gaia, and 2MASS
Cropper, Mark; Charlot, Stéphane; Kawata, Daisuke +6 more
We explore variations of the dust extinction law of the Milky Way by selecting stars from the Swift/UVOT Serendipitous Source Catalogue, cross-matched with Gaia DR2 and 2MASS to produce a sample of 10 452 stars out to ~4 kpc with photometry covering a wide spectral window. The near ultraviolet passbands optimally encompass the 2175 Å bump, so that…
Similarities of magnetoconvection in the umbra and in the penumbra of sunspots
Solanki, S. K.; Lagg, A.; Löptien, B. +1 more
Context. It is unclear why there is a rather sharp boundary in sunspots between the umbra and the penumbra. Both regions exhibit magnetoconvection, which manifests in penumbral filaments in the penumbra and in umbral dots in the umbra.
Aims: Here we compare the physical properties of umbral dots and penumbral filaments. Our goal is to underst…
Ancient and present surface evolution processes in the Ash region of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Groussin, O.; Bouley, S. +3 more
Aims: The Rosetta mission provided us with detailed data of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko. In order to better understand the physical processes associated with the comet activity and the surface evolution of its nucleus, we performed a detailed comparative morphometrical analysis of two depressions located in t…
Revealing Ionization Conditions of Sz 102 with Spatially Resolved [Ne III] Microjets
Herczeg, Gregory J.; Liu, Chun-Fan; Shang, Hsien +1 more
Forbidden neon emission lines from small-scale microjets can probe high-energy processes in low-mass young stellar systems. We obtained spatially resolved [Ne III] spectra in the microjets from the classical T Tauri Star Sz 102 using the Hubble Space Telescope Imaging Spectrograph at a spatial resolution of ∼0"1. The blueshifted and redshifted [Ne…
X-ray emission of Seyfert 2 galaxy MCG-01-24-12
Bianchi, S.; Dadina, M.; Braito, V. +7 more
We present a detailed X-ray spectral analysis of the nearby Seyfert 2 galaxy MCG-01-24-12 based on a multi-epoch data set. Data were obtained with different X-ray satellites, namely XMM-Newton, NuSTAR, Swift, and Chandra, and cover different time intervals, from a few days to years. From 2006 to 2013 the source had a 2-10 keV flux of ∼1.5 × 10