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The volcanology of Idunn Mons, Venus: The complex evolution of a possible active volcano
Komatsu, Goro; López, Iván; D'Incecco, Piero +1 more
Idunn Mons is a shield volcano located in the Imdr Regio large igneous rise, a Venusian equivalent to a hotspot geologic province on Earth. Recent studies using emissivity data from ESA's Venus Express Mission, together with experimental laboratory studies on the alteration of volcanic materials on Venus conditions, suggest that Idunn Mons is a po…
SRG/eROSITA view of X-ray reflection in the Central Molecular Zone: a snapshot in September-October 2019
Khabibullin, Ildar; Churazov, Eugene; Sunyaev, Rashid
X-ray reflection off dense molecular clouds in the Galactic Centre region has established itself as a powerful probe for the past activity record of the supermassive black hole Sgr A* on a time-scale of a few hundred years. Detailed studies of the reflection signal from individual clouds allow us to estimate parameters of the brightest flare(s) an…
A Massive, Dusty, HI Absorption-Selected Galaxy at z ≈ 2.46 Identified in a CO Emission Survey
Walter, F.; Prochaska, J. X.; Revalski, M. +4 more
We report a NOrthern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter/submillimeter Array search for redshifted CO emission from the galaxies associated with seven high-metallicity ([M/H] ≥ -1.03) damped Lyα absorbers (DLAs) at z ≈ 1.64-2.51. Our observations yielded one new detection of CO(3-2) emission from a galaxy at z = 2.4604 u…
Discovery of NES, an Extended Tidal Structure in the Northeast of the Large Magellanic Cloud
Cignoni, Michele; Ripepi, Vincenzo; Tosi, Monica +4 more
We report on the discovery of a new diffuse stellar substructure protruding for >5° from the northeastern rim of the LMC disk. The structure, which we dub the northeast structure (NES), was identified by applying a Gaussian mixture model to a sample of strictly selected candidate members of the Magellanic System, extracted from the Gaia EDR3 ca…
Slowly Cooling White Dwarfs in NGC 6752
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +6 more
Recently, a new class of white dwarfs ("slowly cooling WDs") has been identified in the globular cluster M13. The cooling time of these stars is increased by stable thermonuclear hydrogen burning in their residual envelope. These WDs are thought to be originated by horizontal branch (HB) stars populating the HB blue tail that skipped the asymptoti…
GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation
Bouchy, F.; Helled, R.; Mao, S. +37 more
We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright (K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed with the High Accuracy Radial velocity Planet Searcher radial velocities. Seeing-limited photometry and speckle im…
Global dynamics and architecture of the Kepler-444 system
Delisle, J. -B.; Udry, S.; Bourrier, V. +3 more
Context. S-type planets, which orbit one component of multiple-star systems, place strong constraints on planet formation and evolution models. A notable case study is Kepler-444, a triple-star system whose primary is orbited by five planets smaller than Venus in a compact configuration, and for which the stellar binary companion revolves around t…
Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
Wolter, A.; Pintore, F.; Zampieri, L. +1 more
We model the multiwavelength properties of binaries accreting at super-critical rates with the aim to better understand the observational properties of Ultra-luminous X-ray Sources (ULXs). We calculate an extended grid of binary systems which evolve through Roche Lobe Overflow and undergo case A mass transfer from massive donors (up to 25 ${\rm M}…
Kinetic properties of collisionless magnetic reconnection in space plasma: in situ observations
Zhou, Meng; Deng, Xiaohua; Zhong, Zhihong
In collisionless plasmas, magnetic reconnection is widely recognized as one of the most important energy conversion and dissipation processes. Although reconnection is usually manifested as macroscopic effects, such as large-scale magnetic topology change and fast plasma flows, kinetic physics is the underlying process driving these macroscopic ph…
Orbits and Occultation Opportunities of 15 TNOs Observed by New Horizons
Singer, Kelsi N.; Stern, S. Alan; Fraser, Wesley C. +10 more
We present high-precision orbits for 15 trans-Neptunian objects (TNOs) that have been observed by NASA's New Horizons spacecraft at distances from 0.092 to 2.2 au. We also give predictions of 66 future opportunities to observe stellar occultations by them in late 2021-2029, eight of which are possible to observe from the United States. Observation…