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67P/Churyumov-Gerasimenko active areas before perihelion identified by GIADA and VIRTIS data fusion
Fulle, M.; Erard, S.; Capaccioni, F. +16 more
We characterized 67P/Churyumov-Gerasimenko's cometary activity during its inbound arc before perihelion (2014 August-2015 January). We focused on the geomorphological regions of the Northern hemisphere observed by the ESA/Rosetta space probe during this time period. The GIADA dust detector characterized the physical properties of the fluffy and co…
A Radial Velocity Survey of Embedded Sources in the Rho Ophiuchi Cluster
Greene, Thomas P.; Gibb, Erika L.; Wilking, Bruce A. +3 more
We present the results of a radial velocity survey of young stellar objects (YSOs) in early stages of evolution in the core of the L1688 molecular cloud. New and archival spectra obtained with four high-resolution infrared spectrographs were analyzed using Markov chain Monte Carlo techniques that simultaneously fit for the radial velocity, T …
Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation
Barstow, M. A.; Holberg, J. B.; Webb, J. K. +12 more
White dwarf (WD) atmospheres are subjected to gravitational potentials around 105 times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravitational fields. However, a sufficiently strong magnetic field will alter absorption lin…
Dust and Snow Cover on Saturn's Icy Moons
West, R. D.; Le Gall, A.; Bonnefoy, L. E.
The final analysis of the Cassini radar observations of Saturn's icy moons presented here shows that the exchange of material between the planet's dust rings and moons, which is specific to the Saturnian system, plays a key role in the current state of the airless satellite regolith. Far from Saturn, the vast debris ring from Phoebe progressively …
Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOODS-N field
Inoue, Akio K.; Yamada, Toru; Iwata, Ikuru +2 more
We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 an…
Leaves on trees: identifying halo stars with extreme gradient boosted trees
Helmi, Amina; Veljanoski, Jovan; Breddels, Maarten +1 more
Context. Extended stellar haloes are a natural by-product of the hierarchical formation of massive galaxies like the Milky Way. If merging is a non-negligible factor in the growth of our Galaxy, evidence of such events should be encoded in its stellar halo. The reliable identification of genuine halo stars is a challenging task, however.
Aims…
Empirical Modeling of the Geomagnetosphere for SIR and CME-Driven Magnetic Storms
Tsyganenko, N. A.; Andreeva, V. A.
During geomagnetic disturbances, the solar wind arrives in the form of characteristic sequences lasting from tens of hours to days. The most important magnetic storm drivers are the coronal mass ejections (CMEs) and the slow-fast stream interaction regions (SIRs). Previous data-based magnetic field models did not distinguish between these types of…
Finding the Critical Decay Index in Solar Prominence Eruptions
Ravindra, B.; Doddamani, V. H.; Vemareddy, P. +1 more
The background field is assumed to play a prime role in erupting structures like prominences. In the flux rope models, the critical decay index (n c ) is a measure of the rate at which background field intensity decreases with height over the flux rope or erupting structure. In the real observations, the critical height of the backgrou…
Young open cluster IC 4996 and its vicinity: multicolor photometry and Gaia DR2 astrometry
Munari, U.; Straižys, V.; Raudeliūnas, S. +9 more
The open cluster IC 4996 in Cygnus and its vicinity are investigated by applying a two-dimensional photometric classification of stars measured in the Vilnius seven-color photometric system. Cluster members are identified by applying distances based on the Gaia DR2 parallaxes and the point vector diagram of the Gaia DR2 proper motions. For some B-…
OGLE-2018-BLG-0022: A Nearby M-dwarf Binary
Saha, A.; Lowry, S.; Mao, S. +32 more
We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the Robotic Observations of Microlensing Events (ROME)/Reactive Event Assessment (REA) Survey, which indicate that the lens is a low-mass binary star consisting of M3 (0.375 ± 0.020 M ⊙) and M7 (0.098 ± 0.005 M ⊙) components. The lens is u…