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Asteroseismic modelling of the subgiant µ Herculis using SONG data: lifting the degeneracy between age and model input parameters
Bedding, Timothy R.; Stello, Dennis; Deng, Licai +3 more
We model the oscillations of the SONG target µ Herculis to estimate the parameters of the star. The ℓ = 1 mixed modes of µ Her provide strong constraints on stellar properties. The mass and age given by our asteroseismic modelling are 1.10^{+0.11}_{-0.06} M⊙ and 7.55^{+0.96}_{-0.79} Gyr, respectively. The initial helium abun…
Strategic Planning Insights for Future Science-Driven Extravehicular Activity on Mars
Brady, Allyson L.; Kobs Nawotniak, Shannon E.; Hughes, Scott S. +8 more
Short-term and long-term science plans were developed as part of the strategic planning process used by the Biologic Analog Science Associated with Lava Terrains (BASALT) science team to conduct two Mars-simulation missions investigating basalt habitability at terrestrial volcanic analog sites in 2016. A multidisciplinary team of scientists genera…
The CARMENES search for exoplanets around M dwarfs. Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)
Schmitt, J. H. M. M.; Amado, P. J.; Bauer, F. F. +34 more
Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the pl…
Density Fluctuations in the Lower Thermosphere of Mars Retrieved From the ExoMars Trace Gas Orbiter (TGO) Aerobraking
Medvedev, Alexander S.; Hartogh, Paul; Yiğit, Erdal +2 more
The upper atmosphere of Mars is constantly perturbed by small-scale gravity waves propagating from below. As gravity waves strongly affect the large-scale dynamics and thermal state, constraining their statistical characteristics is of great importance for modeling the atmospheric circulation. We present a new data set of density perturbation ampl…
The Martian daytime convective boundary layer: Results from radio occultation measurements and a mesoscale model
Pätzold, M.; Hinson, D. P.; Häusler, B. +4 more
We investigate the behavior of the Martian daytime convective boundary layer (CBL) through a combination of data analysis and modeling. This study relies on two subsets of Mars Express radio occultation (RO) measurements that sounded the atmosphere in northern spring of successive Mars years. Only the first year of observations has been examined p…
The SOPHIE search for northern extrasolar planets. XV. A warm Neptune around the M dwarf Gl 378
Bouchy, F.; Deleuil, M.; Moutou, C. +31 more
We present the detection of a warm Neptune orbiting the M dwarf Gl 378, using radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. The star was observed in the context of the SOPHIE exoplanet consortium's sub-programme dedicated to finding planets around M dwarfs. Gl 378 is an M1 star, of solar …
Nonlinear Color-Metallicity Relations of Globular Clusters. VIII. Reproducing Color Distributions of Individual Globular Cluster Systems in the Virgo and Fornax Galaxy Clusters
Chung, Chul; Lee, Sang-Yoon; Yoon, Suk-Jin
The color distributions of globular clusters (GCs) in individual early-type galaxies show great diversity in their morphology. Based on the conventional “linear” relationship between the colors and metallicities of GCs, the GC metallicity distributions inferred from colors and in turn their formation histories, should be as diverse as they appear.…
Phosphorus Abundances in the Hyades and Galactic Disk
Cescutti, G.; Pilachowski, C. A.; Maas, Z. G.
We have measured phosphorus abundances in nine disk stars between -1 < [Fe/H] < -0.5 and in 12 members of the Hyades open cluster using two P I lines at 1.06 µm. High-resolution infrared spectra were obtained using Phoenix on Gemini South and abundances were determined by comparing synthetic spectra to the observations. The average abu…
An extragalactic chromosome map: the intermediate-age SMC cluster Lindsay 1
Dalessandro, E.; Salaris, M.; Cabrera-Ziri, I. +8 more
The discovery of star-to-star abundance variations (a.k.a. multiple populations - MPs) within globular clusters (GCs), which are generally not found in the field or in lower mass open clusters, has led to a search for the unique property of GCs that allow them to host this phenomenon. Recent studies have shown that MPs are not limited to the ancie…
The Influence of Polar Coronal Holes on the Polar ENA Flux Observed by IBEX
Reisenfeld, D. B.; McComas, D. J.; Schwadron, N. A. +6 more
Polar coronal holes (PCHs) fill the high-latitude heliosphere with fast solar wind during the minimum phase of the solar cycle. This leads to a hardening of the energy spectrum of the proton plasma in the inner heliosheath (IHS), observed as energetic neutral atoms (ENAs) by the Interstellar Boundary Explorer (IBEX). In particular, the highest-ene…