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Four microlensing planets with faint-source stars identified in the 2016 and 2017 season data
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +34 more
Aims: Microlensing planets occurring on faint-source stars can escape detection due to their weak signals. Occasionally, detections of such planets are not reported due to the difficulty of extracting high-profile scientific issues on the detected planets.
Methods: For the solid demographic census of microlensing planetary systems based …
Fine Structures in the Main Sequence Revealed by Gaia Data Release 2
Jao, Wei-Chun; Feiden, Gregory A.
The Hertzsprung-Russell diagram (HRD) is fully examined using the Fourier analysis. This work shows more stars are above the gap in the lower main sequence than below it, and this implies that stars spend more time above the gap while they undergo variability associated with the 3He instability. The enhanced HRD also shows the width of …
The mergers in Abell 2256: displaced gas and its connection to the radio-emitting plasma
Simionescu, A.; Mernier, F.; Werner, N. +5 more
We present the results of deep Chandra and XMM-Newton X-ray imaging and spatially resolved spectroscopy of Abell 2256, a nearby (z = 0.058) galaxy cluster experiencing multiple mergers and displaying a rich radio morphology dominated by a large relic. The X-ray data reveal three subclusters: (I) the 'main cluster'; (II) the remnant of an older mer…
The BepiColombo-Mio Magnetometer en Route to Mercury
Russell, C. T.; Balogh, A.; Zhang, T. L. +26 more
The fluxgate magnetometer MGF on board the Mio spacecraft of the BepiColombo mission is introduced with its science targets, instrument design, calibration report, and scientific expectations. The MGF instrument consists of two tri-axial fluxgate magnetometers. Both sensors are mounted on a 4.8-m long mast to measure the magnetic field around Merc…
Lagrangian chaotic saddles and objective vortices in solar plasmas
Chian, Abraham C. -L.; Park, Sung-Hong; Kusano, Kanya +4 more
We report observational evidence of Lagrangian chaotic saddles in plasmas, given by the intersections of finite-time unstable and stable manifolds, using an ≈22 h sequence of spacecraft images of the horizontal velocity field of solar photosphere. A set of 29 persistent objective vortices with lifetimes varying from 28.5 to 298.3 min are detected …
The Eroding Disk of AU Mic
Augereau, J. -C.; Henning, Th.; Milli, J. +12 more
We report Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph imaging of AU Mic's debris disk from 2017 and archival data. Outward motion of the features in the southeast arm continues. At least three features have reached or exceeded projected escape velocity in the past decade, yielding a combined feature mass-loss rate of ∼1.2 × 1…
Possible Time Correlation between Jet Ejection and Mass Accretion for RW Aur A
Ohyama, Youichi; Pyo, Tae-Soo; Liu, Chun-Fan +17 more
For the active T-Taur star RW Aur A we have performed long-term (∼10 yr) monitoring observations of (1) jet imaging in the [Fe II] 1.644 µm emission line using Gemini-NIFS and VLT-SINFONI; (2) optical high-resolution spectroscopy using CFHT-ESPaDOnS; and (3) V-band photometry using the CrAO 1.25-m telescope and AAVSO. The latter two observat…
Masses of the components of SB2 binaries observed with Gaia - V. Accurate SB2 orbits for 10 binaries and masses of the components of 5 binaries
Mazeh, T.; Halbwachs, J. -L.; Arenou, F. +8 more
Double-lined spectroscopic binaries (SB2s) are one of the main sources of stellar masses, as additional observations are only needed to give the inclinations of the orbital planes in order to obtain the individual masses of the components. For this reason, we are observing a selection of SB2s using the SOPHIE spectrograph at the Haute-Provence obs…
Leveraging HST with MUSE - I. Sodium abundance variations within the 2-Gyr-old cluster NGC 1978
Martocchia, S.; Salaris, M.; Dreizler, S. +10 more
Nearly all of the well-studied ancient globular clusters (GCs), in the Milky Way and in nearby galaxies, show star-to-star variations in specific elements (e.g. He, C, N, O, Na, and Al), known as 'multiple populations' (MPs). However, MPs are not restricted to ancient clusters, with massive clusters down to ~2 Gyr showing signs of chemical variati…
On the X-Ray Spectral Energy Distributions of Star-forming Galaxies: The 0.3-30 keV Spectrum of the Low-metallicity Starburst Galaxy VV 114
Hornschemeier, Ann; Basu-Zych, Antara; Garofali, Kristen +6 more
Binary population synthesis combined with cosmological models suggests that X-ray emission from star-forming galaxies, consisting primarily of emission from X-ray binaries (XRBs) and the hot interstellar medium (ISM), could be an important, and perhaps dominant, source of heating of the intergalactic medium prior to the epoch of reionization. Howe…