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Interplanetary Coronal Mass Ejections During Solar Cycles 23 and 24: Sun-Earth Propagation Characteristics and Consequences at the Near-Earth Region
Joshi, Bhuwan; Cho, K. -S.; Moon, Y. -J. +2 more
In this article, we present a statistical study probing the relation between interplanetary coronal mass ejections (ICMEs) observed at 1 AU and their corresponding coronal mass ejections at the near-Sun region. The work encompasses the ICME activity that occurred during Solar Cycles 23 and 24 (1996 - 2017) while presenting an overall picture of IC…
Fragmentation and filaments at the onset of star and cluster formation. SABOCA 350 µm view of ATLASGAL-selected massive clumps
Menten, K. M.; Weiss, A.; Csengeri, T. +4 more
Context. The structure formation of the dense interstellar material and the fragmentation of clumps into cores is a fundamental step for understanding how stars and stellar clusters form.
Aims: We aim to establish a statistical view of clump fragmentation at subparsec scales based on a large sample of massive clumps selected from the ATLASGAL…
On the Coronal Mass Ejection Detection Rate during Solar Cycles 23 and 24
Gopalswamy, Nat; Yashiro, Seiji; Michalek, Grzegorz
The Solar and Heliospheric Observatory (SOHO) mission’s white light coronagraphs have observed more than 25,000 coronal mass ejections (CMEs) from 1996 January to the end of 2015 July. This period of time covers almost two solar cycles (23 and 24). The basic attributes of CMEs, reported in the SOHO/Large Angle and Spectrometric Coronagraph (LASCO)…
HERBS I: Metallicity and alpha enhancement along the Galactic bulge minor axis
Freeman, K. C.; Nataf, D. M.; Asplund, M. +3 more
To better understand the origin and evolution of the Milky Way bulge, we have conducted a survey of bulge red giant branch and clump stars using the High Efficiency and Resolution Multi-Element Spectrograph on the Anglo-Australian Telescope. We targeted ARGOS survey stars with predetermined bulge memberships, covering the full metallicity distribu…
Solar Filament Eruptions as Precursors to Flare-CME Events: Establishing the Temporal Connection
Nandy, Dibyendu; Srivastava, Nandita; Sinha, Suvadip
Elongated structures on the Sun’s surface known as filaments are known to have a connection with energetic events of space weather consequence (flares and coronal mass ejections (CMEs)). In this work, we explore the connection between the eruptive dynamics of filaments and the initiation of solar flares and CMEs. We estimate the filament eruption …
Three hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181, and WASP-183
Bouchy, F.; Queloz, D.; Ségransan, D. +21 more
We present the discovery of three transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (∼0.5 MJup, ∼1.6 RJup) in a 3.07-d orbit of a V = 12.6 K2 star, WASP-183 b (∼0.5 MJup, ∼1.5 RJup) in a 4.11-d orbit of a V = 12.8 G9/K0 star; and one hot-Saturn planet WASP-181 b (∼0.3 MJup,…
Multiwavelength Analysis of the Merging Galaxy Cluster A115
van Weeren, R. J.; Dawson, W. A.; Jee, M. James +4 more
A115 is a merging galaxy cluster at z ∼ 0.2 with a number of remarkable features, including a giant (∼2.5 Mpc) radio relic, two asymmetric X-ray peaks with trailing tails, and a peculiar line-of-sight velocity structure. We present a multiwavelength study of A115 using optical imaging data from Subaru, X-ray data from Chandra, and spectroscopic da…
The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
Bland-Hawthorn, Joss; Cabrera-Lavers, Antonio; Gallego, Jesús +21 more
Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly improved by increasing the cosmological volume, in either depth or area, and by observing the same targets in different wavelength ranges. A multi-wavelength approach using different observ…
Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts
Sierks, H.; Blum, J.; Güttler, C. +8 more
Context. The landing and rebound of the Philae lander, which was part of the ESA Rosetta mission, enabled us to study the mechanical properties of the surface of comet 67P/Churyumov-Gerasimenko, because we could use Philae as an impact probe.
Aims: The aim is to approximate the descent and rebound trajectory of the Philae lander and use this …
M-subdwarf Research. I. Identification, Modified Classification System, and Sample Construction
Qin, Li; Luo, A. -Li; Zhang, Shuo +7 more
We propose a revision of the system developed by Lépine et al. for spectroscopic M-subdwarf classification. Based on an analysis of subdwarf spectra and templates from Savcheva et al., we show that the CaH1 feature originally proposed by Gizis is important in selecting reliable cool subdwarf spectra. This index should be used in combination with t…