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On the size distribution of spots within sunspot groups
Solanki, Sami K.; Krivova, Natalie A.; Mandal, Sudip +1 more
The size distribution of sunspots provides key information about the generation and emergence processes of the solar magnetic field. Previous studies of size distribution have primarily focused on either the whole group or individual spot areas. In this paper we investigate the organisation of spot areas within sunspot groups. In particular, we an…
Ice-rich landforms of the southern mid-latitudes of Mars: A case study in Nereidum Montes
Crown, David A.; Berman, Daniel C.; Smith, Isaac B. +1 more
Mapping of Viscous Flow Features (VFFs), a general grouping of ice-rich flow features that includes Lobate Debris Aprons (LDA), Concentric Crater Fill (CCF), Lineated Valley Flow (LVF), small lobate flows (i.e., glacier-like flows, or GLFs), and arcuate ridges, in the southern hemisphere of Mars shows a dense concentration in Nereidum Montes, alon…
Local Environments of Low-redshift Supernovae
Sandstrom, Karin M.; Leroy, Adam K.; Koch, Eric W. +7 more
We characterize the local (2 kpc sized) environments of Type Ia, II, and Ib/c supernovae (SNe) that have recently occurred in nearby (d ≲ 50 Mpc) galaxies. Using ultraviolet (UV; from Galaxy Evolution Explorer) and infrared (IR; from Wide-field Infrared Survey Explorer) maps of 359 galaxies and a sample of 472 SNe, we measure the star formation ra…
Small lobe of comet 67P: Characterization of the Wosret region with ROSETTA-OSIRIS
Sierks, H.; Barucci, M. A.; Fornasier, S. +3 more
Aims: We investigated Wosret, a region located on the small lobe of the 67P/Churyumov-Gerasimenko comet subject to strong heating during the perihelion passage. This region includes the two last landing sites of the Philae lander as well as, notably the final one, Abydos, where the lander performed most of its measurements. We study Wosret in…
Unexpected Short-period Variability in Dwarf Carbon Stars from the Zwicky Transient Facility
Roulston, Benjamin R.; Green, Paul J.; Hermes, J. J. +1 more
Dwarf carbon (dC) stars, main-sequence stars showing carbon molecular bands, are enriched by mass transfer from a previous asymptotic-giant-branch (AGB) companion, which has since evolved to a white dwarf. While previous studies have found radial-velocity variations for large samples of dCs, there are still relatively few dC orbital periods in the…
A study of open clusters Frolov 1 and NGC 7510 using CCD UBV photometry and Gaia DR2 astrometry
Bilir, Selçuk; Yontan, Talar; Paunzen, Ernst +6 more
We present reddening, photometric metallicity, age, and distance estimates for the Frolov 1 and NGC 7510 open clusters based on charge‑coupled device (CCD)UBVphotometric andGaiadata. Photometric observations were collected using the 1‑m telescope of the TÜBİTAK National Observatory.Gaiadata release 2 (DR2) proper motion data in the direction of tw…
Ionospheric plasma energization at Mars during the September 2017 ICME event
Bhardwaj, Anil; Thampi, R. Satheesh; Thampi, Smitha V. +2 more
During September 2017, the solar active region (AR) 12673 produced several flares and Coronal Mass Ejections (CMEs). On 10 September 2017, a stronger and wider CME was erupted from AR 12673, which was Mars-directed (max. vsw = ~840 km s-1 near 1.5 au). This ICME caused a major space weather event at Mars on 12-13 September. W…
The Formation and Lifetime of Outflows in a Solar Active Region
Polito, Vanessa; Warren, Harry P.; Barczynski, Krzysztof +4 more
Active regions are thought to be one contributor to the slow solar wind. Upflows in EUV coronal spectral lines are routinely observed at their boundaries, and provide the most direct way for upflowing material to escape into the heliosphere. The mechanisms that form and drive these upflows, however, remain to be fully characterized. It is unclear …
The role of astronomical silicates during a cometary outburst
Wesołowski, Marcin
This paper presents a new approach to analyzing the change of cometary brightness. In our considerations, we assume that astronomical silicates (dust agglomerates) and gas are present in the coma. This assumption is a consequence of the analysis of the result observed during the Rosetta mission to comet 67P/Churyumov-Gerasimenko (abbreviated 67P/C…
The Dragonfly Wide Field Survey. II. Accurate Total Luminosities and Colors of Nearby Massive Galaxies and Implications for the Galaxy Stellar-mass Function
van Dokkum, Pieter; Conroy, Charlie; Abraham, Roberto +8 more
Stellar-mass estimates of massive galaxies are susceptible to systematic errors in their photometry, due to their extended light profiles. In this study, we use data from the Dragonfly Wide Field Survey to accurately measure the total luminosities and colors of nearby massive galaxies. The low surface brightness limits of the survey (µg…