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Dust observations with antenna measurements and its prospects for observations with Parker Solar Probe and Solar Orbiter
Issautier, Karine; Meyer-Vernet, Nicole; Mann, Ingrid +10 more
The electric and magnetic field instrument suite FIELDS on board the NASA Parker Solar Probe and the radio and plasma waves instrument RPW on the ESA Solar Orbiter mission that explore the inner heliosphere are sensitive to signals generated by dust impacts. Dust impacts have been observed using electric field antennas on spacecraft since the 1980…
HAZMAT. V. The Ultraviolet and X-Ray Evolution of K Stars
Barman, Travis; Meadows, Victoria S.; Richey-Yowell, Tyler +3 more
Knowing the high-energy radiation environment of a star over a planet’s formation and evolutionary period is critical in determining if that planet is potentially habitable and if any biosignatures could be detected, as UV radiation can severely change or destroy a planet’s atmosphere. Current efforts for finding a potentially habitable planet are…
Discovery of a 21 Myr old stellar population in the Orion complex⋆
Lewis, Geraint F.; Buder, Sven; Ness, Melissa K. +12 more
Context. The Orion complex is arguably the most studied star-forming region in the Galaxy. While stars are still being born in the Orion nebula, the oldest part was believed to be no more than 13 Myr old.
Aims: In order to study the full hierarchy of star formation across the Orion complex, we perform a clustering analysis of the Ori OB1a reg…
Search for extra-tidal RR Lyrae stars in Milky Way globular clusters from Gaia DR2
Minniti, Dante; Singh, Harinder P.; Kundu, Richa
We used extra-tidal RR Lyrae stars to study the dynamics of Galactic globular clusters and know how effects like dynamical friction and tidal disruption affect these clusters. The Gaia DR2 catalogue for RR Lyrae stars (Clementini et al. 2018) is used along with the proper motions and tidal radii data for the globular clusters compiled from literat…
Stellar accelerations and the galactic gravitational field
Easther, Richard; Silverwood, Hamish
Typical stars in the Milky Way galaxy have velocities of hundreds of kilometres per second and experience gravitational accelerations of ∼10-10 m s-2, resulting in velocity changes of a few centimetres per second over a decade. Measurements of these accelerations would permit direct tests of the applicability of Newtonian dyn…
Properties of small meteoroids studied by meteor video observations
Vojáček, V.; Borovička, J.; Koten, P. +2 more
Aims: The complex study of millimetre-sized meteoroids can reveal more about the structure and origin of population of these meteoroids.
Methods: Double-station video observations, paired with spectroscopic video observations, were used to study small meteoroids. In total 152 sporadic and shower meteors of maximum brightness between magn…
Dynamical evolution of star-forming regions: III. Unbound stars and predictions for Gaia
Parker, Richard J.; Schoettler, Christina; Wright, Nicholas J. +3 more
We use N-body simulations to probe the early phases of the dynamical evolution of star-forming regions and focus on mass and velocity distributions of unbound stars. In this parameter space study, we vary the initial virial ratio and degree of spatial and kinematic substructure and analyse the fraction of stars that become unbound in two different…
Keck OSIRIS AO LIRG Analysis (KOALA): Feedback in the Nuclei of Luminous Infrared Galaxies
Inami, Hanae; Murphy, Eric; Díaz-Santos, Tanio +21 more
The role of feedback in triggering or quenching star formation and hence driving galaxy evolution can be directly studied with high-resolution integral field observations. The manifestation of feedback in shocks is particularly important to examine in galaxy mergers, where violent interactions of gas take place in the interstellar medium during th…
An Automatic Detection Algorithm Applied to Fast Magnetosonic Waves With Observations of the Van Allen Probes
Yuan, Zhigang; Yao, Fei; Yu, Xiongdong +2 more
Fast magnetosonic (MS) waves can play an important role in the evolution of the inner magnetosphere. However, there is still not an effective method to quantitatively identify such waves for observations of the Van Allen Probes reasonably. In this paper, we used Van Allen Probes data from 18 September 2012 to 30 September 2014 to find a more compr…
ALMA Detection of Dark Chromospheric Holes in the Quiet Sun
Solanki, Sami K.; White, Stephen M.; Loukitcheva, Maria A.
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of a quiet-Sun region at a wavelength of 3 mm, obtained during the first solar ALMA cycle on 2017 April 27, and compare them with available chromospheric observations in the UV and visible as well as with photospheric magnetograms. ALMA images clearly reveal the presence o…