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Relationship Between the Ozone and Water Vapor Columns on Mars as Observed by SPICAM and Calculated by a Global Climate Model
Forget, F.; Montmessin, F.; Fedorova, A. +10 more
Ozone (O3) in the atmosphere of Mars is produced following the photolysis of CO2 and is readily destroyed by the hydrogen radicals (HOx) released by the photolysis and oxidation of water vapor. As a result, an anti correlation between ozone and water vapor is expected. We describe here the O3 H2
The Sun's dynamic extended corona observed in extreme ultraviolet
Seaton, Daniel B.; Caspi, Amir; Slater, Gregory +6 more
The `middle corona' is a critical transition between the highly disparate physical regimes of the lower and outer solar coronae. Nonetheless, it remains poorly understood due to the difficulty of observing this faint region (1.5-3 R⊙). New observations from the Solar Ultraviolet Imager of a Geostationary Operational Environmental Satell…
A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X-1
Bremer, M.; Wilms, J.; Uttley, P. +10 more
Cygnus X-1 is the first Galactic source confirmed to host an accreting black hole. It has been detected across the entire electromagnetic spectrum from radio to GeV gamma-rays. The source's radio through mid-infrared radiation is thought to originate from the relativistic jets. The observed high degree of linear polarization in the MeV X-rays sugg…
TESS Data for Asteroseismology: Photometry
Huber, Daniel; Jenkins, Jon M.; Pope, Benjamin J. S. +12 more
Over the last two decades, asteroseismology has increasingly proven to be the observational tool of choice for the study of stellar physics, aided by the high quality of data available from space-based missions such as CoRoT, Kepler, K2, and the Transiting Exoplanet Survey Satellite (TESS). TESS in particular will produce more than an order of mag…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). III. A pilot study of stellar and accretion properties
Munari, U.; Alcalá, J. M.; Manara, C. F. +8 more
The mass-accretion rate, Ṁacc, is a crucial parameter for the study of the evolution of accretion disks around young low-mass stellar objects (YSOs) and for planet formation studies. The Taurus star forming region (SFR) is rich in pre-main sequence stars, most of them of the T Tauri class. A variety of methodologies have been used in th…
A Solid Interpretation of Bright Radar Reflectors Under the Mars South Polar Ice
Smith, I. B.; Horgan, B. H. N.; Whitten, J. L. +4 more
Bright radar reflections observed beneath the south polar layered deposits (SPLD) by the Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument were interpreted to represent liquid water, but the required amounts of salt and heat to form and maintain liquids in this location are implausible given what is known about Mars. Here, we p…
A high-contrast search for variability in HR 8799bc with VLT-SPHERE
Wagner, Kevin; Apai, Dániel; Zurlo, Alice +11 more
The planets HR8799bc display nearly identical colours and spectra as variable young exoplanet analogs such as VHS 1256-1257ABb and PSO J318.5-22, and are likely to be similarly variable. Here we present results from a 5-epoch SPHERE IRDIS broadband-H search for variability in these two planets. HR 8799b aperture photometry and HR 8799bc negative s…
Distant Relatives: The Chemical Homogeneity of Comoving Pairs Identified in Gaia
Ting, Yuan-Sen; Hawkins, Keith; El-Badry, Kareem +3 more
Comoving pairs, even at the separations of ${ \mathcal O }({10}^{6})$ au, are a predicted reservoir of conatal stars. We present detailed chemical abundances of 62 stars in 31 comoving pairs with separations of 102-107 au and 3D velocity differences <2 km s-1. This sample includes both bound comoving pairs/wide …
NGC 5128 Globular Cluster Candidates Out to 150 kpc: A Comprehensive Catalog from Gaia and Ground-based Data
Forbes, Duncan A.; Caldwell, Nelson; Strader, Jay +9 more
We present a new catalog of 40,502 globular cluster (GC) candidates in NGC 5128 out to a projected radius of ~150 kpc based on data from the Panoramic Imaging Survey of Centaurus and Sculptor, the Gaia Data Release 2, and the NOAO Source Catalog. Ranking these candidates based on the likelihood that they are true GCs, we find that approximately 19…
The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35
Jeffries, R. D.; Deliyannis, Constantine P.; Sun, Qinghui +1 more
New fibre spectroscopy and radial velocities from the WIYN telescope are used to measure photospheric lithium in 242 high-probability, zero-age main-sequence F- to K-type members of the rich cluster M35. Combining these with published rotation periods, the connection between lithium depletion and rotation is studied in unprecedented detail. At T