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High-precision analysis of binary stars with planets. I. Searching for condensation temperature trends in the HD 106515 system
Jofré, E.; Jaque Arancibia, M.; Saffe, C. +4 more
Aims: We explore for the first time the probable chemical signature of planet formation in the remarkable binary system HD 106515. Star A hosts a massive long-period planet with 9 MJup detected by radial velocity, while there is no planet detected at the B star. We also refine stellar and planetary parameters by using non-solar-sca…
Earth atmospheric loss through the plasma mantle and its dependence on solar wind parameters
Nilsson, Hans; Dandouras, Iannis; Slapak, Rikard +3 more
Atmospheric loss and ion outflow play an important role in the magnetospheric dynamics and in the evolution of the atmosphere on geological timescales—an evolution which is also dependent on the solar activity. In this paper, we investigate the total
The Masses of Supernova Remnant Progenitors in M83
Williams, Benjamin F.; Blair, William P.; Dolphin, Andrew +5 more
We determine the ages of the young, resolved stellar populations at the locations of 237 optically identified supernova remnants in M83. These age distributions put constraints on the progenitor masses of the supernovae that produced 199 of the remnants. The other 38 show no evidence for having a young progenitor and are therefore good Type Ia SNR…
High-resolution Thermal Infrared Imaging of 3200 Phaethon
Jewitt, David; Li, Jing; Asmus, Daniel +1 more
We present thermal infrared observations of the active asteroid (and Geminid meteoroid stream parent) 3200 Phaethon using the Very Large Telescope. The images, at 10.7 µm wavelength, were taken with Phaethon at its closest approach to Earth (separation of 0.07 au) in 2017 December, at a linear resolution of about 14 km. We probe the Hill sph…
Deep long asymmetric occultation in EPIC 204376071
Vanderburg, A.; Rappaport, S.; Bouma, L. G. +15 more
We have discovered a young M star of mass 0.16 M⊙ and radius 0.63 R⊙, likely in the Upper Sco Association, that exhibits only a single 80 per cent deep occultation of 1-d duration. The star has frequent flares and a low-amplitude rotational modulation, but is otherwise quiet over 160 d of cumulative observation during K2 camp…
The mass and density of the dwarf planet (225088) 2007 OR10
Young, Leslie A.; Schwamb, Megan E.; Noll, Keith S. +10 more
The satellite of (225088) 2007 OR10 was discovered on archival Hubble Space Telescope images and along with new observations with the WFC3 camera in late 2017 we have been able to determine the orbit. The orbit's notable eccentricity, e ≈ 0.3, may be a consequence of an intrinsically eccentric orbit and slow tidal evolution, but may als…
Two p-mode-dominated subdwarf B pulsators in binaries with F-star companions observed with K2
Reed, M. D.; Jeffery, C. S.; Németh, P. +6 more
This paper presents spectroscopic and seismic analyses of two rare hybrid pulsating subdwarf B (sdB) stars, PG 0048+091 and PG 1315-123, which are dominated by pressure (p)-mode pulsations. These are only the second and third sdB pulsators with detected frequency multiplets in both the p- and g (gravity)-mode regions. This allows an examination of…
The dynamics and distribution of angular momentum in HiZELS star-forming galaxies at z = 0.8-3.3
Smail, Ian; Swinbank, A. M.; Glazebrook, K. +18 more
We present adaptive optics assisted integral field spectroscopy of 34 star-forming galaxies at z = 0.8-3.3 selected from the HiZELS narrow-band survey. We measure the kinematics of the ionized interstellar medium on ∼1 kpc scales, and show that the galaxies are turbulent, with a median ratio of rotational to dispersion support of V / σ = 0.82 ± 0.…
Multi-season optical modulation phased with the orbit of the super-Earth 55 Cancri e
Fossati, L.; Winn, J. N.; Lendl, M. +13 more
Context. 55 Cnc e is a transiting super-Earth orbiting a solar-like star with an orbital period of 17.7 h. In 2011, using the Microvariability and Oscillations in Stars (MOST) space telescope, a quasi-sinusoidal modulation in flux was detected with the same period as the planetary orbit. The amplitude of this modulation was too large to be explain…
Probing Polaris' puzzling radial velocity signals. Pulsational (in-)stability, orbital motion, and bisector variations
Anderson, R. I.
We investigate temporally changing variability amplitudes and the multi-periodicity of the type-I Cepheid Polaris using 161 high-precision radial velocity (RV) and bisector inverse span (BIS) measurements based on optical spectra recorded using Hermes at the 1.2 m Flemish Mercator telescope on La Palma, Canary Islands, Spain. Using an empirical te…