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Kepler binary stars in NGC 6791 open cluster: KIC 2437060, KIC 2437149, and KIC 2438490
Çakırlı, Ömür; Hoyman, Barış
The study of detached eclipsing binaries in open clusters can provide powerful tests of theoretical stellar evolutionary models. These models must simultaneously fit the masses, radii, and radiative properties of the eclipsing stars with essentially the same distance, age, and initial composition. In this way, clusters are ideal test benches for v…
MAPPS as a multi-mission and multi-body Science Planning and Simulation Tool for ESA solar system missions
Merrit, Donald; Sierra, Mar; Martin, Patrick +5 more
The Mission Analysis and Payload Planning System (MAPPS) is a multi-mission software system developed during the last 20 years to support the science operations planning for the ESA solar system missions at the European Space Astronomy Centre (ESAC) near Madrid.Developed initially only to visualise the coverage of MEX experiments onto the Martian …
Ion-Ion Cross-Field Instability of Lower Hybrid Waves in the Inner Coma of Comet 67P
Karlsson, Tomas; Stenberg Wieser, Gabriella; Odelstad, Elias +2 more
We show that an ion-ion cross-field streaming instability between cold newborn cometary ions and heated heavy ions that were picked up upstream is likely a contributing source of observed lower hybrid (LH) waves in the inner coma of comet 67P/Churyumov-Gerasimenko. Electric field oscillations in the LH frequency range are common here, and have pre…
Age-velocity relations with GALEXF U V
Murray-Clay, Ruth; Crandall, Sara; Smith, Graeme H. +3 more
A relationship between chromospheric activity and age is calibrated for FGK dwarf stars using GALEX
The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms
Infante, L.; Metcalfe, N.; Shanks, T. +5 more
We compare the contribution of active galactic nuclei (AGNs) and star formation towards dust heating in sub-mm galaxies (SMGs). We have used ALMA at 0.1-arcsec resolution to image a complete flux-limited sample of seven sub-mm sources previously shown to have spectral energy distributions that were as well-fitted by obscured AGN as star-forming ga…
Off-season lee wave cloud over the Arsia Mons in Mars: A study based on Mars Colour Camera (MCC)
Kalita, Jyotirmoy; Guha, Anirban
The present analysis reported the lee wave interpretation on Arsia Mons Elongated Cloud (AMEC) that used to appear over the lee side of the Arsia Mons. The present work also reported the wavelength, the cloud's height, and wind speed of the observed lee wave structure. The estimated wind speed is 86 ± 4.9 m/s, with a wavelength of 60 ± 0.3 km at a…
Interstellar Extinction at High Galactic Latitudes: An Analytical Approximation
Kovaleva, D. A.; Malkov, O. Yu.; Avdeeva, A. S. +1 more
Distance dependences of interstellar extinction (${{A}V}(d)$) for a number of high-latitude areas of the southern sky were obtained using the data of the RAVE DR6 spectroscopic survey and the Gaia DR2/EDR3 astrometric survey. These dependencies were approximated by the classical barometric function (cosecant law). Function parameters we…
X-Ray Observation of the Roche-lobe-filling White Dwarf plus Hot Subdwarf System ZTF J213056.71+442046.5
Tiengo, A.; Mereghetti, S.; Esposito, P. +9 more
ZTF J213056.71+442046.5 is the prototype of a small class of recently discovered compact binaries composed of a white dwarf and a hot subdwarf that fills its Roche lobe. Its orbital period of only 39 minutes is the shortest known for the objects in this class. Evidence for a high orbital inclination (i = 86°) and for the presence of an accretion d…
Rising of a magnetic null point in the wake of an erupting flux rope
Filippov, Boris
Arcades of flare loops rise, slowing down in the wake of eruptive prominences. They lag significantly from the top of prominences and do not reach too great heights in the corona. It is widely accepted that their evolution is governed by the limited reconnection rate in the current sheet developed below the eruptive prominence. We suggest that the…
Energy Exchanges in Saturn's Polar Regions From Cassini Observations: Eddy-Zonal Flow Interactions
Read, Peter L.; Sanchez-Lavega, Agustin; Antuñano, Arrate +3 more
Saturn's polar regions (polewards of ∼63° planetocentric latitude) are strongly dynamically active with zonal jets, polar cyclones and the intriguing north polar hexagon (NPH) wave. Here we analyze measurements of horizontal winds, previously obtained from Cassini images by Antuñano et al. (2015), htt…