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Size diversity of old Large Magellanic Cloud clusters as determined by internal dynamical evolution
Dalessandro, E.; Beccari, G.; Mucciarelli, A. +5 more
The distribution of size as a function of age observed for star clusters in the Large Magellanic Cloud (LMC) is very puzzling: young clusters are all compact, while the oldest systems show both small and large sizes. This phenomenon is commonly interpreted as being due to a population of binary black holes driving a progressive expansion of cluste…
The methane distribution and polar brightening on Uranus based on HST/STIS, Keck/NIRC2, and IRTF/SpeX observations through 2015
Sromovsky, L. A.; Fry, P. M.; Karkoschka, E. +2 more
Space Telescope Imaging Spectrograph (STIS) observations of Uranus in 2002 and 2012 revealed that both polar regions of Uranus were depleted in upper tropospheric methane relative to equatorial regions. Similar observations in 2015 confirm the relative stability of the north polar methane depletion, but show that the north polar region was becomin…
Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR5
Han, Zhanwen; Deng, Licai; Luo, Yangping +1 more
Combing Gaia DR2 with LAMOST DR5, we spectroscopically identified 924 hot subdwarf stars, among which 32 stars exhibit strong double-lined composite spectra. We measured the effective temperature T eff, surface gravity {log} g, helium abundance y = nHe/nH, and radial velocities (RVs) of 892 non-composite spectra hot subdwarf stars by fi…
MOVES - II. Tuning in to the radio environment of HD189733b
Moutou, C.; Vidotto, A. A.; Bourrier, V. +7 more
We present stellar wind modelling of the hot Jupiter host HD189733, and predict radio emission from the stellar wind and the planet, the latter arising from the interaction of the stellar wind with the planetary magnetosphere. Our stellar wind models incorporate surface stellar magnetic field maps at the epochs 2013 June/July, 2014 September, and …
TESS first look at evolved compact pulsators. Asteroseismology of the pulsating helium-atmosphere white dwarf TIC 257459955
Córsico, Alejandro H.; Hermes, J. J.; Bell, Keaton J. +10 more
Context. Pulsation frequencies reveal the interior structures of white dwarf stars, shedding light on the properties of these compact objects that represent the final evolutionary stage of most stars. Two-minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS) records pulsation signatures from bright white dwarfs over the e…
CO, H2O, H2O+ line and dust emission in a z = 3.63 strongly lensed starburst merger at sub-kiloparsec scales
Smail, I.; Pérez-Fournon, I.; Ivison, R. J. +22 more
Using the Atacama Large Millimeter/submillimeter Array (ALMA), we report high angular-resolution observations of the redshift z = 3.63 galaxy H-ATLAS J083051.0+013224 (G09v1.97), one of the most luminous strongly lensed galaxies discovered by the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS). We present 0.″2-0.″4 resolution images o…
Methane on Mars: New insights into the sensitivity of CH4 with the NOMAD/ExoMars spectrometer through its first in-flight calibration
Vandaele, Ann Carine; Thomas, Ian; Liuzzi, Giuliano +9 more
The Nadir and Occultation for MArs Discovery instrument (NOMAD), onboard the ExoMars Trace Gas Orbiter (TGO) spacecraft was conceived to observe Mars in solar occultation, nadir, and limb geometries, and will be able to produce an outstanding amount of diverse data, mostly focused on properties of the atmosphere. The infrared channels of the instr…
Observations of SN 2017ein Reveal Shock Breakout Emission and a Massive Progenitor Star for a Type Ic Supernova
Bi, Shaolan; Rest, A.; Baron, E. +23 more
We present optical and ultraviolet observations of nearby Type Ic supernova (SN Ic) SN 2017ein, as well as a detailed analysis of its progenitor properties from both the early-time observations and the prediscovery Hubble Space Telescope (HST) images. The optical light curves started from within 1 day to ∼275 days after explosion, and optical spec…
Using APOGEE Wide Binaries to Test Chemical Tagging with Dwarf Stars
Majewski, Steven R.; Hayes, Christian R.; Anguiano, Borja +4 more
Stars of a common origin are thought to have similar, if not nearly identical, chemistry. Chemical tagging seeks to exploit this fact to identify Milky Way subpopulations through their unique chemical fingerprints. In this work, we compare the chemical abundances of dwarf stars in wide binaries to test the abundance consistency of stars of a commo…
Triage of astrometric binaries - how to find triple systems and dormant black hole secondaries in the Gaia orbits
Mazeh, T.; Holl, B.; Faigler, S. +1 more
Preparing for the expected wealth of Gaia detections, we consider here a simple algorithm for classifying unresolved astrometric binaries with main-sequence (MS) primary into three classes: binaries with a probable MS secondary, with two possible values for the mass ratio; probable hierarchical triple MS systems with an astrometric secondary as a …