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B fields in OB stars (BOB): The magnetic triple stellar system HD 164492C in the Trifid nebula
Ilyin, I.; Järvinen, S.; González, J. F. +15 more
HD 164492C is a spectroscopic triple stellar system that has been recently detected to possess a strong magnetic field. We have obtained high-resolution spectroscopic and spectropolarimetric observations over a time span of two years and derived physical, chemical and magnetic properties for this object. The system is formed by an eccentric close …
Measurement of a Cosmographic Distance Ratio with Galaxy and Cosmic Microwave Background Lensing
Madhavacheril, Mathew S.; Miyatake, Hironao; Spergel, David N. +4 more
We measure the gravitational lensing shear signal around dark matter halos hosting constant mass galaxies using light sources at z ∼1 (background galaxies) and at the surface of last scattering at z ∼1100 (the cosmic microwave background). The galaxy shear measurement uses data from the CFHTLenS survey, and the microwave background shear measureme…
AX J1910.7+0917: the slowest X-ray pulsar
Sidoli, L.; Esposito, P.; Israel, G. L. +2 more
Pulsations from the high-mass X-ray binary AX J1910.7+0917 were discovered during Chandra observations performed in 2011. We report here more details on this discovery and discuss the source nature. The period of the X-ray signal is P = 36200 ± 110 s, with a pulsed fraction, PF, of 63 ± 4 per cent. Given the association with a massive B-type compa…
Indication of a massive circumbinary planet orbiting the low-mass X-ray binary MXB 1658-298
Paul, Biswajit; Jain, Chetana; Dutta, Anjan +2 more
We present an X-ray timing analysis of the transient X-ray binary MXB 1658-298, using data obtained from the RXTE and XMM-Newton observatories. We have made 27 new mid-eclipse time measurements from observations made during the two outbursts of the source. These new measurements have been combined with the previously known values to study long-ter…
Disentangling the ISM phases of the dwarf galaxy NGC 4214 using [C II] SOFIA/GREAT observations
Lebouteiller, V.; Madden, S. C.; Abel, N. P. +9 more
Context. The [C II] 158 µm fine structure line is one of the dominant cooling lines in the interstellar medium (ISM) and is an important tracer of star formation. Recent velocity-resolved studies with Herschel/HIFI and SOFIA/GREAT showed that the [C II] line can constrain the properties of the ISM phases in star-forming regions. The [C II] l…
CMB and matter power spectra with non-linear dark-sector interactions
vom Marttens, R. F.; Casarini, L.; Hipólito-Ricaldi, W. S. +1 more
An interaction between dark matter and dark energy, proportional to the product of their energy densities, results in a scaling behavior of the ratio of these densities with respect to the scale factor of the Robertson-Walker metric. This gives rise to a class of cosmological models which deviate from the standard model in an analytically tractabl…
Investigating the physical properties of outbursts on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +46 more
Cometary outbursts on several comets have been observed both by ground-based telescopes and by in situ instruments on spacecraft. However, the mechanism behind these phenomena and their physical properties are still unclear. The optical, spectrocopic and infrared remote imaging system (OSIRIS) onboard the Rosetta spacecraft provided first-hand inf…
Active Longitude and Coronal Mass Ejection Occurrences
Srivastava, A. K.; Erdélyi, R.; Singh, T. +2 more
The spatial inhomogeneity of the distribution of coronal mass ejection (CME) occurrences in the solar atmosphere could provide a tool to estimate the longitudinal position of the most probable CME-capable active regions in the Sun. The anomaly in the longitudinal distribution of active regions themselves is often referred to as active longitude (A…
A new solar wind-driven global dynamic plasmapause model: 1. Database and statistics
Liemohn, Michael W.; Gallagher, Dennis L.; He, Fei +5 more
A large database, possibly the largest plasmapause location database, with 49,119 plasmapause crossing events from the in situ observations and 3957 plasmapause profiles (corresponding to 48,899 plasmapause locations in 1 h magnetic local time (MLT) intervals) from optical remote sensing from 1977 to 2015 by 18 satellites is compiled. The response…
Hubble Space Telescope astrometry of the closest brown dwarf binary system - I. Overview and improved orbit★
Apai, D.; Pourbaix, D.; Bedin, L. R. +4 more
Located at 2 pc, the L7.5+T0.5 dwarfs system WISE J104915.57-531906.1 (Luhman 16 AB) is the third closest system known to Earth, making it a key benchmark for detailed investigation of brown dwarf atmospheric properties, thermal evolution, multiplicity, and planet-hosting frequency. In the first study of this series - based on a multicycle Hubble …