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On the interpretation of sub-giant branch morphologies of intermediate-age star clusters with extended main sequence turnoffs
Girardi, Léo; Marigo, Paola; Goudfrooij, Paul +4 more
High-quality photometry of many star clusters in the Magellanic Clouds with ages of 1-2 Gyr revealed main sequence turnoffs (MSTOs) that are significantly wider than can be accounted for by a simple stellar population (SSP). Such extended MSTOs (eMSTOs) are often interpreted in terms of an age spread of several 108 yr, challenging the t…
A Solar Coronal Jet Event Triggers a Coronal Mass Ejection
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
In this paper, we present multi-point, multi-wavelength observations and analysis of a solar coronal jet and coronal mass ejection (CME) event. Employing the GCS model, we obtained the real (three-dimensional) heliocentric distance and direction of the CME and found it to propagate at a high speed of over 1000 km s-1. The jet erupted be…
Evidence for a Transition Region Response to Penumbral Microjets in Sunspots
Carlsson, M.; Rouppe van der Voort, L. H. M.; Vissers, G. J. M.
Penumbral microjets (PMJs) are short-lived, fine-structured, and bright jets that are generally observed in chromospheric imaging of the penumbra of sunspots. Here we investigate their potential transition region signature by combining observations with the Swedish 1-m Solar Telescope in the Ca ii H and Ca ii 8542 Å lines with ultraviolet imaging …
High-resolution Imaging of NGC 2346 with GSAOI/GeMS: Disentangling the Planetary Nebula Molecular Structure to Understand Its Origin and Evolution
Villaver, Eva; Shaw, Richard A.; García-Hernández, D. A. +3 more
We present high spatial resolution (≈ 60-90 mas) images of the molecular hydrogen emission in the planetary nebula (PN) NGC 2346. The data were acquired during the system verification of the Gemini Multi-conjugate Adaptive Optics System + Gemini South Adaptive Optics Imager. At the distance of NGC 2346, 700 pc, the physical resolution corresponds …
Embedded clays and sulfates in Meridiani Planum, Mars
Bibring, J. -P.; Poulet, F.; Davies, G. R. +4 more
The area of Meridiani Planum on Mars became of particular interest after the detection of coarse-grained, gray hematite, which led to the choice of this region as final landing site for the Mars Exploration Rover Opportunity. Multiple additional minerals have since been detected in the region, both from orbit and in situ. The present paper reasses…
Energy Dissipation in Magnetic Null Points at Kinetic Scales
Lapenta, Giovanni; Eriksson, Elin; Divin, Andrey +2 more
We use kinetic particle-in-cell and MHD simulations supported by an observational data set to investigate magnetic reconnection in clusters of null points in space plasma. The magnetic configuration under investigation is driven by fast adiabatic flux rope compression that dissipates almost half of the initial magnetic field energy. In this phase …
The Stellar Initial Mass Function at 0.9 < z < 1.5
Barro, Guillermo; Pérez-González, Pablo G.; Koekemoer, Anton M. +12 more
We explore the stellar initial mass function (IMF) of a sample of 49 massive quiescent galaxies (MQGs) at 0.9 < z < 1.5. We base our analysis on intermediate resolution spectro-photometric data in the GOODS-N field taken in the near-infrared and optical with the Hubble Space Telescope Wide Field Camera 3 G141 grism and the Survey for High-z …
Origin of Interplanetary Dust through Optical Properties of Zodiacal Light
Ishiguro, Masateru; Yang, Hongu
This study investigates the origin of interplanetary dust particles (IDPs) through the optical properties, albedo and spectral gradient, of zodiacal light. The optical properties were compared with those of potential parent bodies in the solar system, which include D-type (as analogs of cometary nuclei), C-type, S-type, X-type, and B-type asteroid…
Warm intermediate inflation in the Randall–Sundrum II model in the light of Planck 2015 and BICEP2 results: a general dissipative coefficient
Videla, Nelson; Herrera, Ramón; Olivares, Marco
A warm inflationary Universe in the Randall–Sundrum II model during intermediate inflation is studied. For this purpose, we consider the general form for the dissipative coefficient
Kuiper belt structure around nearby super-Earth host stars
Matthews, Brenda C.; Wyatt, Mark C.; Udry, Stéphane +9 more
We present new observations of the Kuiper belt analogues around HD 38858 and HD 20794, hosts of super-Earth mass planets within 1 au. As two of the four nearby G-type stars (with HD 69830 and 61 Vir) that form the basis of a possible correlation between low-mass planets and debris disc brightness, these systems are of particular interest. The disc…