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Magnetic flux participation in solar surface magnetism during solar cycle 24
Wang, Jing-Xiu; Jin, Chun-Lan
This study aims at investigating surface magnetic flux participation among different types of magnetic features during solar cycle 24. State-of-the-art observations from SDO/HMI and Hinode/SOT are combined to form a unique database in the interval from April 2010 to October 2015. Unlike previous studies, the statistics presented in this paper are …
Generation of photoclinometric DTMs for application to transient changes on the surface of comet 67P/Churyumov-Gerasimenko
Vincent, J. -B.; Hayes, A. G.; Tang, Y. +4 more
Context. The wide spatial and temporal coverage of 67P/Churyumov-Gerasimenko (67P) by the Rosetta mission has revealed a surface created by scattered large-scale changes and numerous small-scale changes. The many small-scale changes are of particular interest because they are unexpected and ubiquitous. As their topographic relief is often smaller …
Fragmented Comet 73P/Schwassmann-Wachmann 3
Graykowski, Ariel; Jewitt, David
Comet 73P/Schwassmann-Wachmann 3 has been observed to fragment on several occasions, yet the cause of its fragmentation remains poorly understood. We use previously unpublished archival Hubble Space Telescope data taken in 2006 to study the properties of the primary fragment, 73P-C, in order to constrain the potential fragmentation mechanisms. Cur…
Chemical composition of the outer halo globular cluster Palomar 15
Rich, R. Michael; Xu, Siyi; Koch, Andreas
Globular clusters (GCs) in the outer Milky Way halo are important tracers of the assembly history of our Galaxy. Only a few of these objects show spreads in heavier elements beyond the canonical light-element variations that have essentially been found throughout the entire Galactic GC system, suggesting a more complex origin and evolution of thes…
CN Andromedae: a shallow contact binary with a possible tertiary component
Soydugan, Faruk; Aliçavuş, Fahri; Yildirim, Muhammed Faruk
In this study, new photometric observations of shallow contact binary CN Andromedae (CN And) were performed and multi-color (BV R) CCD light curves (LCs) were obtained. Simultaneous analysis of new LCs and published radial velocity (RV) data reveals that the system is an early contact binary in which both components have recently filled their inne…
Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk
Dong, Ruobing; Wilner, David J.; Andrews, Sean M. +3 more
We analyze the highest-resolution millimeter continuum and near-infrared (NIR) scattered-light images presented to date of the circumbinary disk orbiting V4046 Sgr, a ∼20-Myr-old actively accreting, close binary T Tauri star system located a mere 72.4 pc from Earth. We observed the disk with the Atacama Large Millimeter/submillimeter Array (ALMA) …
Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations
Koutchmy, S.; Tavabi, E.
To study motions and oscillations in the solar chromosphere and at the transition region level we analyze some extreme Doppler shifts observed off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans and slit-jaw imaging observations performed in the near-ultraviolet channels were used. Large transverse oscillations are reveale…
Limits on the Electromagnetic Counterpart of Binary Black Hole Coalescence at Visible Wavelengths
Turpin, Damien; Laugier, Romain; Noysena, Kanthanakorn +4 more
We used the Télescope à Action Rapide pour les Objets Transitoires network of telescopes to search for the electromagnetic counterparts of GW150914, GW170104, and GW170814, which were reported to originate from binary black hole merger events by the Laser Interferometer Gravitational-wave Observatory and Virgo collaborations. Our goal is to constr…
The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star population
Hatzidimitriou, D.; Bonanos, A. Z.; Yang, M. +2 more
Studies of the massive star population in galaxies beyond the Local Group are the key to understanding the link between their numbers and modes of star formation in different environments. We present the analysis of the massive star population of the galaxies NGC 1326A, NGC 1425, and NGC 4548 using archival images obtained with the Hubble Space Te…
Spectral imaging of the thermal Sunyaev-Zel'dovich effect in X-COP galaxy clusters: method and validation
Baldi, A. S.; Bourdin, H.; Mazzotta, P. +4 more
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe the thermal pressure of the intra-cluster gas, especially in the outermost regions where X-ray observations suffer from photon statistics. For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm fo…