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Volatiles and Refractories in Surface-Bounded Exospheres in the Inner Solar System
Leblanc, François; Nishino, Masaki N.; Vervack, Ronald J. +11 more
Volatiles and refractories represent the two end-members in the volatility range of species in any surface-bounded exosphere. Volatiles include elements that do not interact strongly with the surface, such as neon (detected on the Moon) and helium (detected both on the Moon and at Mercury), but also argon, a noble gas (detected on the Moon) that s…
Linking Soft Excess in Ultraluminous X-Ray Sources with Optically Thick Wind Driven by Supercritical Accretion
Feng, Hua; Qiu, Yanli
Supercritical accretion onto compact objects may drive massive winds that are nearly spherical, optically thick, and Eddington limited. Blackbody emission from the photosphere is the direct observational signature of the wind. Here we investigate whether or not it can explain the soft emission component seen in the energy spectra of ultraluminous …
Three-dimensional Structure and Dust Extinction in the Small Magellanic Cloud
Dolphin, Andrew E.; Yanchulova Merica-Jones, Petia; Williams, Benjamin F. +6 more
We examine the three-dimensional structure and dust extinction properties in a ∼200 pc × 100 pc region in the southwest bar of the Small Magellanic Cloud (SMC). We model a deep Hubble Space Telescope optical color-magnitude diagram (CMD) of red clump and red giant branch stars in order to infer the dust extinction and galactic structure. We model …
Martian cloud climatology and life cycle extracted from Mars Express OMEGA spectral images
Bibring, Jean-Pierre; Langevin, Yves; Gondet, Brigitte +7 more
A Martian water-ice cloud climatology has been extracted from OMEGA data covering 7 Martian years (MY 26-32) on the dayside. We derived two products, the Reversed Ice Cloud Index (ICIR) and the Percentage of Cloudy Pixels (PCP), indicating the mean cloud thickness and nebulosity over a regular grid (1° longitude × 1° latitude × 1° Ls × 1 h Local T…
FUMES. II. Lyα Reconstructions of Young, Active M Dwarfs
France, Kevin; Youngblood, Allison; Pineda, J. Sebastian
The H I Lyα (1215.67 Å) emission line dominates the far-UV spectra of M dwarf stars, but strong absorption from neutral hydrogen in the interstellar medium makes observing Lyα challenging even for the closest stars. As part of the Far-Ultraviolet M-dwarf Evolution Survey, the Hubble Space Telescope has observed 10 early-to-mid M dwarfs with ages r…
Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
Debes, John H.; Gonzales, Eileen C.; Kiman, Rocio +25 more
Through the Backyard Worlds: Planet 9 citizen science project, we have identified a wide-separation (~10', ~9900 au projected) substellar companion to the nearby (~17.5 pc), mid-M dwarf Ross 19. We have developed a new formalism for determining chance alignment probabilities based on the BANYAN Σ tool, and find a 100% probability that this is a ph…
The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study
Sabo, R.; Torres, M. A. P.; Hakala, P. +15 more
We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical spectroscopy and R-band photometry campaign. The radial velocity curve of the evolved donor star has a semi-amplitude $K_2=126.4 \pm 0.9 \, \mathrm{km}\, \mathrm{s}^{-1}$ and an orbital period $P=1.99…
The MUSE Hubble Ultra Deep Field Survey. XVI. The angular momentum of low-mass star-forming galaxies: A cautionary tale and insights from TNG50
Bacon, Roland; Contini, Thierry; Richard, Johan +14 more
We investigate the specific angular momentum (sAM) j(< r) profiles of intermediate redshift (0.4 < z < 1.4) star-forming galaxies (SFGs) in the relatively unexplored regime of low masses (down to M⋆ ∼ 108 M⊙) and small sizes (down to Re ∼ 1.5 kpc), and we characterize the sAM scaling relation (i…
The Sun's distance from the Galactic Centre and mid-plane, and the Galactic old bulge's morphology: 715 VVV Type II Cepheids
Pietrukowicz, Pawel; Gedalin, Michael; Jiang, Ing-Guey +2 more
A statistical method is employed in tandem with new VISTA Variables in the Via Lactea (VVV) near-infrared observations to determine the Sun's distance from the Galactic Centre (r0, GC), the Sun's height from the local mid-plane (z0), and to likewise infer the shape of the Galactic ∼10 Gyr old bulge. Specifically, the conclusi…
First Observations of Anomalous Cosmic Rays in to 36 Solar Radii
McComas, D. J.; Christian, E. R.; Leske, R. A. +11 more
NASA's Parker Solar Probe mission continues to travel closer to the Sun than any prior human-made object, with an expected closest approach of <10 solar radii (<0.046 au) by 2024. On board, the Integrated Science Investigation of the Sun instrument suite makes unprecedented in situ measurements of energetic particles in the near-Sun environm…