Search Publications
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…
Ground-based optical transmission spectrum of the hot Jupiter HAT-P-1b
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +6 more
Context. Time-series spectrophotometric studies of exoplanets during transit using ground-based facilities are a promising approach to characterize their atmospheric compositions.
Aims: We aim to investigate the transit spectrum of the hot Jupiter HAT-P-1b. We compare our results to those obtained at similar wavelengths by previous space-base…
GMRT 610 MHz observations of galaxy clusters in the ACT equatorial sample
Hilton, Matt; Sifón, Cristóbal; Bond, J. Richard +11 more
We present Giant Metrewave Radio Telescope (GMRT) 610 MHz observations of 14 Atacama Cosmology Telescope (ACT) clusters, including new data for nine. The sample includes 73 per cent of ACT equatorial clusters with M500 > 5 × 1014 M⊙. We detect diffuse emission in three of these (27^{+20}_{-14} per cent): we dete…
Absolute properties of RU Cnc revisited: an active RS CVn-type eclipsing binary with red giant branch and main-sequence components
Koçak, D.; Yakut, K.; Çokluk, K. A. +3 more
We present observations and analysis of an RS CVn-type double-lined eclipsing binary system, RU Cnc. The system has been observed for over a century. High-quality long-cadence observations, newly obtained from the Kepler K2 C5 and C18 campaigns, and two radial velocity curves were combined and analysed simultaneously, assuming a multispot model. T…
Araneiform terrain formation in Angustus Labyrinthus, Mars
Jaumann, R.; Hao, J.; Michael, G. G. +1 more
The south polar area of Mars exhibits an abundance of distinctive and exotic landforms, most of which occur within the region covered by the seasonal CO2 cap. Araneiform terrain (also referred to as terrain covered by "spiders") is one of these unusual geomorphic features, resulting from CO2 sublimation driven seasonal erosio…
Simulating Solar Coronal Mass Ejections Constrained by Observations of Their Speed and Poloidal Flux
Singh, T.; Yalim, M. S.; Pogorelov, N. V. +1 more
We demonstrate how the parameters of a Gibson-Low flux-rope-based coronal mass ejection (CME) can be constrained using remote observations. Our Multi-Scale Fluid-Kinetic Simulation Suite has been used to simulate the propagation of a CME in a data-driven solar corona background computed using the photospheric magnetogram data. We constrain the CME…