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The W-subtype active contact binary PZ UMa with a possible more massive tertiary component
Soonthornthum, Boonrucksar; Zhou, Xiao
Two sets of multiple-color (B, V, RC, IC) light curves of PZ UMa were observed independently with the 2.4 m telescope at the Thai National Observatory and the 1 m telescope at Yunnan Observatories. The light curves were analyzed with the Wilson-Devinney program and the two sets of light curves produced consistent results, whi…
Observations of the chemical and thermal response of 'ring rain' on Saturn's ionosphere
Baines, Kevin H.; O'Donoghue, James; Moore, Luke +4 more
In this study we performed a new analysis of ground-based observations that were taken on 17 April 2011 using the 10-metre Keck telescope on Mauna Kea, Hawaii. Emissions from H3+, a major ion in Saturn's ionosphere, were previously analyzed from these observations, indicating that peaks in emission at specific latitudes were …
A Comparative Study of 2017 July and 2012 July Complex Eruptions: Are Solar Superstorms “Perfect Storms” in Nature?
Vourlidas, Angelos; Liu, Ying D.; Hu, Huidong +2 more
It is paramount from both scientific and societal perspectives to understand the generation of extreme space weather. We discuss the formation of solar superstorms based on a comparative study of the 2012 July 23 and 2017 July 23 eruptions. The first one is Carrington-class, and the second could rival the 1989 March event that caused the most inte…
XMMSL2 J144605.0+685735: a slow tidal disruption event
Read, A. M.; Berger, E.; Komossa, S. +6 more
Aims: We investigate the evolution of X-ray selected tidal disruption events.
Methods: New events are found in near real-time data from XMM-Newton slews, and are monitored by multi-wavelength facilities.
Results: In August 2016, X-ray emission was detected from the galaxy XMMSL2 J144605.0+685735 (also known as 2MASX 14460522+6857311…
Are Slope Streaks Indicative of Global-Scale Aqueous Processes on Contemporary Mars?
Zorzano, María-Paz; Bhardwaj, Anshuman; Sam, Lydia +1 more
Slope streaks are prevalent and intriguing dark albedo surface features on contemporary Mars. Slope streaks are readily observed in the equatorial and subequatorial dusty regolith regions with low thermal inertia. They gradually fade over decadal timescales. The proposed mechanisms for their formation vary widely based on several physicochemical a…
The Nitrogen Carrier in Inner Protoplanetary Disks
Banzatti, Andrea; Walsh, Catherine; Pontoppidan, Klaus M. +4 more
The dominant reservoirs of elemental nitrogen in protoplanetary disks have not yet been observationally identified. Likely candidates are HCN, NH3, and N2. The relative abundances of these carriers determine the composition of planetesimals as a function of disk radius due to strong differences in their volatility. A signific…
Spherical models of star clusters with potential escapers
Varri, Anna Lisa; Heggie, Douglas C.; Gieles, Mark +2 more
An increasing number of observations of the outer regions of globular clusters (GCs) have shown a flattening of the velocity dispersion profile and an extended surface density profile. Formation scenarios of GCs can lead to different explanations of these peculiarities, therefore the dynamics of stars in the outskirts of GCs are an important tool …
Kinetic Energy Transfer from X-Ray Ultrafast Outflows to Millimeter/Submillimeter Cold Molecular Outflows in Seyfert Galaxies
Kohno, Kotaro; Mizumoto, Misaki; Izumi, Takuma
UltraFast Outflows (UFOs), seen as X-ray blueshifted absorption lines in active galactic nuclei (AGNs), are considered to be a key mechanism for AGN feedback. In this scenario, UFO kinetic energy is transferred into the cold and extended molecular outflow observed at the millimeter/submillimeter wavelength, which blows away the gas and suppresses …
K2 Ultracool Dwarfs Survey - V. High superflare rates on rapidly rotating late-M dwarfs
Mullan, D. J.; Burgasser, A. J.; Stassun, K. G. +5 more
We observed strong superflares (defined as flares with energy in excess of 1033 erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter 2M0831+2042; M7 V), 2MASS J08371832+2050349 (hereafter 2M0837+2050; M8 V), and 2MASS J08312608+2244586 (hereafter 2M0831+2244; M9 V). 2M0831+2042 and 2M0837+2050 are members of the young (∼700 M…
KELT-24b: A 5M J Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148
Cargile, Phillip A.; Bieryla, Allyson; Latham, David W. +76 more
We present the discovery of KELT-24 b, a massive hot Jupiter orbiting a bright (V = 8.3 mag, K = 7.2 mag) young F-star with a period of 5.6 days. The host star, KELT-24 (HD 93148), has a T eff = {6509}-49+50 K, a mass of M * = {1.460}-0.059+0.055 M ⊙, a radius of R *…