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Long X-ray flares from the central source in RCW 103. XMM-Newton and VLT observations in the aftermath of the 2016 outburst
Tiengo, A.; Rea, N.; Esposito, P. +7 more
We observed the slowly revolving pulsar 1E 161348-5055 (1E 1613, spin period of 6.67 h) in the supernova remnant RCW 103 twice with XMM-Newton and once with the Very Large Telescope (VLT). The VLT observation was performed on 2016 June 30, about a week after the detection of a large outburst from 1E 1613. At the position of 1E 1613, we found a nea…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) IV: HST/STIS spectroscopy of the sub-kpc warm outflow in F14394+5332
Batcheldor, D.; Ramos Almeida, C.; Tadhunter, C. +1 more
Considerable uncertainties remain about the nature of warm, AGN-driven outflows and their impact on the evolution of galaxies. This is because the outflows are often unresolved in ground-based observations. As part of a project to study the AGN outflows in some of the most rapidly evolving galaxies in the local Universe, here we present Hubble Spa…
The high-energy radiation environment of the habitable-zone super-Earth LHS 1140b
Campana, S.; Ghirlanda, G.; Ghisellini, G. +4 more
Context. In the last few years many exoplanets in the habitable zone (HZ) of M-dwarfs have been discovered, but the X-ray/UV activity of cool stars is very different from that of our Sun. The high-energy radiation environment influences the habitability, plays a crucial role for abiogenesis, and impacts the chemistry and evolution of planetary atm…
A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star
Bonavera, L.; Rebolo, R.; González Hernández, J. I. +9 more
We present a super-Earth orbiting close to the inner edge of the habitable zone of the cool dwarf star K2-286 (EPIC 249889081), detected with data from the K2 mission in its 15th campaign. The planet has radius of 2.1 ± 0.2 R⊕, near the 1.5-2.0 R⊕ gap in the radii distribution. The equilibrium temperature is 347^{+21}_{-11} K…
A fractal analysis application of the pre-whitening technique to δ Scuti stars time series
Garrido, R.; Suárez, J. C.; de Franciscis, S. +4 more
Fractal fingerprints have been found recently in the light curves of several δ Scuti stars observed by Convection Rotation and planetary Transits(CoRoT) satellite. This sole fact might pose a problem for the detection of pulsation frequencies using classical pre-whitening techniques, but it is also a potentially rich source for information about p…
The Mass of the White Dwarf Companion in the Self-lensing Binary KOI-3278: Einstein versus Newton
Kruse, Ethan; Latham, David W.; Quinn, Samuel N. +10 more
KOI-3278 is a self-lensing stellar binary consisting of a white dwarf secondary orbiting a Sun-like primary star. Kruse & Agol noticed small periodic brightenings every 88.18 days in the Kepler photometry and interpreted these as the result of microlensing by a white dwarf with about 63% of the mass of the Sun. We obtained two sets of spectra …
Colour-dependent accurate modelling of dynamical parallaxes and masses of visual binaries. Application to the VB+SB2 systems with definitive orbits
Andrade, Manuel
Context. Two fundamental characteristics of binary systems are the masses of their components and their distance to the Earth. In this way, the dynamical parallax is an accurate and very helpful tool. Nevertheless, there has been some concern with regard to the use of a unique linear mass-luminosity relation (MLR) for the entire main sequence (MS)…
Jupiter's Dark Polar Region as Observed by the Hubble Space Telescope During the Juno Approach Phase
Nichols, J. D.; Bunce, E. J.; Swithenbank-Harris, B. G.
We present an analysis of Jupiter's dark polar region, previously described as a crescent-shaped region devoid of emission along the dawnside poleward of the main oval. Using ultraviolet images obtained by the Hubble Space Telescope between days of year 137 and 176, coupled with interplanetary data captured during the approach phase of the NASA Ju…
Observational study of hydrocarbons in the bright photodissociation region of Messier 8
Menten, K. M.; Lee, M. -Y.; Wyrowski, F. +3 more
Aims: Hydrocarbons are ubiquitous in the interstellar medium, but their formation is still not well understood, depending on the physical environment in which they are found. Messier 8 (M8) is host to one of the brightest H II regions and photodissociation regions (PDRs) in our galaxy. With the observed C2H and c-C3H
A Chandra Study: Are Dwarf Carbon Stars Spun Up and Rejuvenated by Mass Transfer?
Roulston, Benjamin R.; Green, Paul J.; Anderson, Scott F. +9 more
Carbon stars (with C/O > 1) were long assumed to all be giants, because only asymptotic giant branch (AGB) stars dredge up significant carbon into their atmospheres. The case is nearly ironclad now that the formerly mysterious dwarf carbon (dC) stars are actually far more common than C giants and have accreted carbon-rich material from a former…