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Observation of the Solar Corona Using Radio Scintillation with the Akatsuki Spacecraft: Difference Between Fast and Slow Wind
Matsumoto, Takuma; Pätzold, Martin; Imamura, Takeshi +8 more
The properties of the coronal plasma at heliocentric distances of 1.5 - 8.9 R⊙ (solar radii) were studied with radio-occultation observations using JAXA's Akatsuki spacecraft in 2016. Physical parameters that characterize the solar wind were retrieved from the intensity-scintillation time series by fitting a theoretical spectrum to the …
Machine learning for fast transients for the Deeper, Wider, Faster programme with the Removal Of BOgus Transients (ROBOT) pipeline
Mahabal, Ashish; Zhang, Jielai; Cooke, Jeff +3 more
The Deeper, Wider, Faster (DWF) programme is optimized to detect fast transients that show luminosity changes on time-scales of sub-second to days using fast cadence simultaneous observations and rapid response follow up. One of the significant bottlenecks in DWF is the time required to assess candidates for rapid follow up and to manually inspect…
Spectral Evolution of Dark Asteroid Surfaces Induced by Space Weathering over a Decade
Hasegawa, Sunao; Marsset, Michaël; Im, Myungshin +20 more
The surfaces of airless bodies like asteroids in the solar system are known to be affected by space weathering. Experiments simulating space weathering are essential for studying the effects of this process on meteorite samples, but the problem is that the time spent to reproduce space weathering in these experiments is billions of times shorter t…
Optical and near-infrared data and modelling of nova V5668 Sgr
Lawrence, S. S.; Sokolovsky, K. V.; Diaz, M. +4 more
We present Hubble Space Telescope optical images, Keck-OSIRIS near-infrared (NIR) integral field spectroscopy data cubes and Keck-Near InfraRed Camera-2 (NIRC2) NIR images of nova V5668 Sgr from 2016 to 2019. The observations indicate enhanced emission at the polar caps and equatorial torus for low-ionization lines, and enhanced high-ionization em…
Isolated Massive Star Formation in G28.20-0.05
Law, Chi-Yan; Garay, Guido; Mardones, Diego +9 more
We report high-resolution 1.3 mm continuum and molecular line observations of the massive protostar G28.20-0.05 with Atacama Large Millimeter/submillimeter Array. The continuum image reveals a ring-like structure with 2000 au radius, similar to morphology seen in archival 1.3 cm Very Large Array observations. Based on its spectral index and associ…
A New Absolute Proper Motion Determination of Leo I Using HST/WFPC2 Images and Gaia EDR3
Horch, Elliott P.; Kozhurina-Platais, Vera; Casetti-Dinescu, Dana I. +3 more
We measure the absolute proper motion of Leo I using a WFPC2/HST data set that spans up to 10 yr to date the longest time baseline utilized for this satellite. The measurement relies on ~2300 Leo I stars located near the center of light of the galaxy; the correction to absolute proper motion is based on 174 Gaia EDR3 stars and 10 galaxies. Having …
Sublimation origin of active asteroid P/2018 P3
Mutchler, Max; Jewitt, David; Agarwal, Jessica +4 more
Context. Active asteroids show (typically transient) cometary activity, driven by a range of processes. A sub-set, sometimes called main-belt comets, may be driven by sublimation and so could be useful for tracing the present-day distribution of asteroid ice. Object P/2018 P3 has a Tisserand parameter 3.096 but a high eccentricity 0.415, placing i…
KIC 2857323: A Double-mode High-amplitude δ Scuti Star with Amplitude Decline of the First Overtone Mode
Esamdin, Ali; Yang, Tao-Zhi; Zuo, Zhao-Yu +2 more
We investigate the pulsating behavior of KIC 2857323 using high-precision observations from the Kepler mission. Fourier analysis of 4 yr time-series data reveals five independent frequencies for the light variation. Among them, two strong frequencies f 1 and f 3 with a period ratio of 0.774 identify this star as a double-mode…
The Galactic Distribution of Phosphorus: A Survey of 163 Disk and Halo Stars
Janowiecki, Steven; Cargile, Phillip; Hawkins, Keith +3 more
Phosphorus (P) is a critical element for life on Earth, yet the cosmic production sites of P are relatively uncertain. To understand how P has evolved in the solar neighborhood, we measured abundances for 163 FGK stars over a range of -1.09 < [Fe/H] < 0.47 using observations from the Habitable-zone Planet Finder instrument on the Hobby-Eberl…
Spatiokinematic models of five nova remnants: correlations between nova shell axial ratio, expansion velocity, and speed class
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +3 more
We present long-slit intermediate-dispersion spectroscopic observations and narrow-band direct imaging of four classical nova shells, namely T Aur, HR Del, DQ Her, and QU Vul, and the nova-like source CK Vul. These are used to construct models of their nebular remnants using the morphokinematic modelling tool SHAPE to reveal their 3D shape. All th…