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2004 TT357: A Potential Contact Binary in the Trans-Neptunian Belt
Noll, Keith S.; Thirouin, Audrey; Sheppard, Scott S.
We report photometric observations of the trans-Neptunian object 2004 TT357 obtained in 2015 and 2017 using the 4.3 m Lowell’s Discovery Channel Telescope. We derive a rotational period of 7.79 ± 0.01 hr and a peak-to-peak lightcurve amplitude of 0.76 ± 0.03 mag. 2004 TT357 displays a large variability that can be explained b…
Response of the Martian ionosphere to solar activity including SEPs and ICMEs in a two-week period starting on 25 February 2015
Gurnett, D. A.; Lundin, R.; Winningham, J. D. +15 more
In a two-week period between February and March of 2015, a series of interplanetary coronal mass ejections (ICMEs) and solar energetic particle (SEP) events encountered Mars. The interactions were observed by several spacecraft, including Mars Express (MEX), Mars Atmosphere and Volatile Evolution Mission (MAVEN), and Mars Odyssey (MO). The ICME di…
Flank vents and graben as indicators of Late Amazonian volcanotectonic activity on Olympus Mons
Christensen, P. R.; Peters, S. I.
Previous studies have focused on large-scale features on Olympus Mons, such as its flank terraces, the summit caldera complex, and the basal escarpment and aureole deposits. Here we identify and characterize previously unrecognized and unmapped small scale features to help further understand the volcanotectonic evolution of this enormous volcano. …
Fourier-space combination of Planck and Herschel images
Henning, Th.; Ballesteros-Paredes, J.; Abreu-Vicente, J. +3 more
Context. Herschel has revolutionized our ability to measure column densities (NH) and temperatures (T) of molecular clouds thanks to its far infrared multiwavelength coverage. However, the lack of a well defined background intensity level in the Herschel data limits the accuracy of the NH and T maps.
Aims: We aim to prov…
On the possible triple central star system of PN SuWt 2: no ménage à trois at the heart of the Wedding Ring
Jones, David; Boffin, Henri M. J.
SuWt 2 is a planetary nebula consisting of a bright ring-like waist from which protrude faint extended lobes - a morphology believed to be typical of progenitors which have experienced a close-binary evolution. Previous observations of NSV 19992, the star at the projected centre of SuWt 2, have found it to comprise two A-type stars in a 4.9 d ecli…
On the occurrence of magnetic reconnection equatorward of the cusps at the Earth's magnetopause during northward IMF conditions
Fuselier, S. A.; Trattner, K. J.; Petrinec, S. M. +4 more
Magnetic reconnection changes the topology of magnetic field lines. This process is most readily observable with in situ instrumentation at the Earth's magnetopause as it creates open magnetic field lines to allow energy and momentum flux to flow from the solar wind to the magnetosphere. Most models use the direction of the interplanetary magnetic…
An analytic method for identifying dynamically formed runaway stars
Perna, Rosalba; Ryu, Taeho; Leigh, Nathan W. C.
In this paper, we study the three-body products (two single stars and a binary) of binary-binary (2+2) scattering interactions. This is done using a combination of analytic methods and numerical simulations of 2+2 scattering interactions, both in isolation and in a homogeneous background potential. We analytically derive a simple formula relating …
The morphological transformation of red sequence galaxies in clusters since z ∼ 1
Demarco, R.; Lidman, C.; Huertas-Company, M. +6 more
The study of galaxy morphology is fundamental to understand the physical processes driving the structural evolution of galaxies. It has long been known that dense environments host high fractions of early-type galaxies and low fractions of late-type galaxies, indicating that the environment affects the structural evolution of galaxies. In this pap…
Novel Analysis of the Multiwavelength Structure of the Relativistic Jet in Quasar 3C 273
Jamrozy, Marek; Stawarz, Łukasz; Harris, D. E. +4 more
We present a detailed analysis of the best-quality multiwavelength data gathered for the large-scale jet in the core-dominated quasar 3C 273. We analyze all the archival observations of the target with the Chandra X-ray Observatory, the far-ultraviolet observations with the Hubble Space Telescope, and the 8.4 GHz map obtained with the Very Large A…
High-resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6681
McWilliam, Andrew; Chaboyer, Brian; O'Malley, Erin M. +1 more
We obtain high-resolution spectra of nine red giant branch stars in NGC 6681 and perform the first detailed abundance analysis of stars in this cluster. We confirm cluster membership for these stars based on consistent radial velocities of 214.5 ± 3.7 km s-1 and find a mean [Fe/H] = -1.63 ± 0.07 dex and [α/Fe] = 0.42 ± 0.11 dex. Additio…