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A Statistical Study of CME Properties and of the Correlation Between Flares and CMEs over Solar Cycles 23 and 24
Romano, P.; Zuccarello, F.; Compagnino, A.
We investigated some properties of coronal mass ejections (CMEs), such as speed, acceleration, polar angle, angular width, and mass, using data acquired by the Large Angle Spectrometric Coronagraph (LASCO) onboard the Solar and Heliospheric Observatory (SOHO) from 31 July 1997 to 31 March 2014, i.e. during the Solar Cycles 23 and 24. We used two C…
Large Magellanic Cloud Near-infrared Synoptic Survey. IV. Leavitt Laws for Type II Cepheid Variables
Macri, Lucas M.; Rejkuba, Marina; Ngeow, Chow-Choong +3 more
We present time-series observations of Population II Cepheids in the Large Magellanic Cloud at near-infrared (JHK s ) wavelengths. Our sample consists of 81 variables with accurate periods and optical (VI) magnitudes from the OGLE survey, covering various subtypes of pulsators (BL Herculis, W Virginis, and RV Tauri). We generate light-…
CoMaLit - V. Mass forecasting with proxies: method and application to weak lensing calibrated samples
Sereno, Mauro; Ettori, Stefano
Mass measurements of astronomical objects are most wanted but still elusive. We need them to trace the formation and evolution of cosmic structure but we can get direct measurements only for a minority. This lack can be circumvented with a proxy and a scaling relation. The twofold goal of estimating the unbiased relation and finding the right prox…
Detection of buckminsterfullerene emission in the diffuse interstellar medium
Joblin, C.; Berné, O.; Cox, N. L. J. +1 more
Emission of fullerenes in their infrared vibrational bands has been detected in space near hot stars. The proposed attribution of the diffuse interstellar bands at 9577 and 9632 Å to electronic transitions of the buckminsterfullerene cation (i.e. C60+) was recently supported by new laboratory data, confirming the presence of …
New Martian valley network volume estimate consistent with ancient ocean and warm and wet climate
Howard, Alan D.; Luo, Wei; Cang, Xuezhi
The volume of Martian valley network (VN) cavity and the amount of water needed to create the cavity by erosion are of significant importance for understanding the early Martian climate, the style and rate of hydrologic cycling, and the possibility of an ancient ocean. However, previous attempts at estimating these two quantities were based on sel…
A direct examination of the dynamics of dipolarization fronts using MMS
Russell, C. T.; Fazakerley, A. N.; Owen, C. J. +13 more
Energy conversion on the dipolarization fronts (DFs) has attracted much research attention through the suggestion that intense current densities associated with DFs can modify the more global magnetotail current system. The current structures associated with a DF are at the scale of one to a few ion gyroradii, and their duration is comparable to a…
Achievements and Challenges in the Science of Space Weather
Veronig, Astrid; Balogh, André; Koskinen, Hannu E. J. +3 more
In June 2016 a group of 40 space weather scientists attended the workshop on Scientific Foundations of Space Weather at the International Space Science Institute in Bern. In this lead article to the volume based on the talks and discussions during the workshop we review some of main past achievements in the field and outline some of the challenges…
Supernova progenitors, their variability and the Type IIP Supernova ASASSN-16fq in M66
Kochanek, C. S.; Stanek, K. Z.; Dong, Subo +10 more
We identify a pre-explosion counterpart to the nearby Type IIP supernova ASASSN-16fq (SN 2016cok) in archival Hubble Space Telescope data. The source appears to be a blend of several stars that prevents obtaining accurate photometry. However, with reasonable assumptions about the stellar temperature and extinction, the progenitor almost certainly …
On the Relation between the In Situ Properties and the Coronal Sources of the Solar Wind
Lepri, S. T.; Zhao, L.; Zurbuchen, T. H. +4 more
We categorize the types of solar wind using a new classification scheme based on the location of the wind’s coronal source regions in the solar atmosphere and near-solar heliosphere. We first trace the solar wind measured by ACE/SWEPAM and SWICS from 1998 to 2011 at 1 au back to a 2.5{R}{{s}} solar surface using ballistic mapping at con…
Dense CO in Mrk 71-A: Superwind Suppressed in a Young Super Star Cluster
James, Bethan L.; Oey, M. S.; Reiter, Megan +4 more
We report the detection of CO(J=2-1) coincident with the super star cluster (SSC) Mrk 71-A in the nearby Green Pea analog galaxy, NGC 2366. Our observations with the Northern Extended Millimeter Array reveal a compact, ∼7 pc, molecular cloud whose mass ({10}5 {M}⊙ ) is similar to that of the SSC, consistent with a high star f…