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PG 1610+062: a runaway B star challenging classical ejection mechanisms
Geier, S.; Heber, U.; Irrgang, A. +2 more
Hypervelocity stars are rare objects, mostly main-sequence (MS) B stars, traveling so fast that they will eventually escape from the Milky Way. Recently, it has been shown that the popular Hills mechanism, in which a binary system is disrupted via a close encounter with the supermassive black hole at the Galactic center, may not be their only ejec…
Evaluating the evidence of multipolar surface magnetic field in PSR J0108-1431
Arumugasamy, Prakash; Mitra, Dipanjan
PSR J0108-1431 is an old pulsar where the X-ray emission is expected to have a thermal component from the polar cap and a non-thermal component from the magnetosphere. Although the phase-integrated spectra are fit best with a single non-thermal component modelled with a power law (PL) of photon index Γ = 2.9, the X-ray pulse profiles do show the p…
GALEX absolute calibration and extinction coefficients based on white dwarfs
Genest-Beaulieu, C.; Bergeron, P.; Gianninas, A. +3 more
We use 1837 DA white dwarfs with high signal-to-noise ratio spectra and Gaia parallaxes to verify the absolute calibration and extinction coefficients for the Galaxy Evolution Explorer (GALEX). We use white dwarfs within 100 pc to verify the linearity correction to the GALEX data. We find that the linearity correction is valid for magnitudes brigh…
Face changing companion of the redback millisecond pulsar PSR J1048+2339
Takata, J.; Kong, A. K. H.; Hui, C. Y. +3 more
We present optical observations of the redback millisecond pulsar PSR J1048+2339, which is a 4.66 ms radio pulsar in a compact binary with an orbital period of six hours. We obtained high-quality light curves of PSR J1048+2339 with the Lulin 1 m Telescope. The system shows two distinct six-hour orbital modulations, in which an ellipsoidal modulati…
Super-Earths in the TW Hya disc
Pinte, Christophe; Price, Daniel J.; Mentiplay, Daniel
We test the hypothesis that the sub-millimetre thermal emission and scattered light gaps seen in recent observations of TW Hya are caused by planet-disc interactions. We perform global three-dimensional dusty smoothed particle hydrodynamics simulations, comparing synthetic observations of our models with dust thermal emission, CO emission, and sca…
Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
Choi, Yumi; Boubert, Douglas; Nidever, David L. +7 more
We report spectroscopic measurements of stars in the recently discovered young stellar association Price-Whelan 1 (PW 1), which was found in the vicinity of the Leading Arm (LA) of the Magellanic Stream (MS). We obtained Magellan+MIKE high-resolution spectra of the 28 brightest stars in PW 1 and used The Cannon to determine their stellar parameter…
Subdwarf B stars as possible surviving companions in Type Ia supernova remnants
Li, Jiao; Meng, Xiangcun
Although Type Ia supernovae (SNe Ia) are so important in many astrophysical fields, a debate on their progenitor model is still endless. Searching the surviving companion in a supernova remnant (SNR) may distinguish different progenitor models, since a companion still exists in the remnant for the single-degenerate (SD) model, but does not for the…
Interpretation of heliocentric water production rates of comets
Attree, N.; Hartogh, P.; Rezac, L. +2 more
Aims: We investigate the influence of three basic factors on water production rate as a function of heliocentric distance: nucleus shape, the spin axis orientation, and the distribution of activity on a comet's surface.
Methods: We used a basic water sublimation model driven by solar insolation to derive total production rates for differ…
Diagnostics of the Prominence Plasma from Hα and Mg II Spectral Observations
Heinzel, Petr; Schmieder, Brigitte; Chen, Yao +5 more
The goal of this paper is to derive the physical conditions of the prominence observed on 2017 March 30. To do so, we use a unique set of data in Mg II lines obtained with the space-borne Interface Region Imaging Spectrograph (IRIS) and in Hα line with the ground-based Multi-Channel Subtractive Double Pass spectrograph operating at the Meudon sola…
Saturn's Ionosphere: Electron Density Altitude Profiles and D-Ring Interaction From The Cassini Grand Finale
Persoon, A. M.; Kurth, W. S.; Wahlund, J. -E. +8 more
We present the electron density (ne) altitude profiles of Saturn's ionosphere at near-equatorial latitudes from all 23 orbits of Cassini's Grand Finale. The data are collected by the Langmuir probe part of the Radio and Plasma Wave Science investigation. A high degree of variability in the electron density profiles is observed. However,…