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Characterization of the HD 219134 multiplanet system I. Observations of stellar magnetism, wind, and high-energy flux
Petit, P.; Vidotto, A. A.; Murthy, J. +9 more
HD 219134 hosts several planets, with seven candidates reported, and the two shortest period planets are rocky (4-5 M⊕) and transit the star. Here, we present contemporaneous multiwavelength observations of the star HD 219134. We observed HD 219134 with the Narval spectropolarimeter at the Observatoire du Pic du Midi and used Zeeman-Dop…
Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS spectroscopy
Komossa, S.; Guainazzi, Matteo; Paragi, Zsolt +10 more
We report on an optical (SDSS) and X-ray (XMM-Newton) study of an optically selected sample of four dual AGN systems at projected separations of 30-60 kpc. All sources are detected in the X-ray band (0.3-10keV); seven objects are optically identified as Seyfert, while one source, optically classified as a low-ionization nuclear emission-line regio…
A possible solution of the puzzling variation of the orbital period of MXB 1659-298
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
MXB 1659-298 is a transient neutron-star low-mass X-ray binary system that shows eclipses with a periodicity of 7.1 h. MXB 1659-298 went to outburst in 2015 August, after 14 years of quiescence. We investigate the orbital properties of this source with a baseline of 40 years, obtained by combining the eight eclipse arrival times present in the lit…
Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode
Saio, H.; Bowman, D. M.; Smalley, B. +5 more
We present the results of a multisite photometric observing campaign on the rapidly oscillating Ap (roAp) star 2MASS 16400299-0737293 (J1640; V = 12.7). We analyse photometric B data to show the star pulsates at a frequency of 151.93 d-1 (1758.45 µHz; P = 9.5 min) with a peak-to-peak amplitude of 20.68 mmag, making it one of the h…
ΛCDM predictions for the satellite population of M33
Carlin, Jeffrey L.; Patel, Ekta; Tollerud, Erik J. +2 more
Triangulum (M33) is the most massive satellite galaxy of Andromeda (M31), with a stellar mass of about 3 × 109 M⊙. Based on abundance matching techniques, M33's total mass at infall is estimated to be of order 1011 M⊙. ΛCDM simulations predict that M33-mass halos host several of their own low-mass satell…
A 100 kpc nebula associated with the `Teacup' fading quasar
Humphrey, A.; Villar-Martín, M.; Ramos Almeida, C. +4 more
We report the discovery of an ∼100 kpc ionized nebula associated with the radio-quiet type 2 quasar (QSO2) nicknamed the `Teacup' (z = 0.085). The giant nebula is among the largest known around active galaxies at any z. We propose that it is part of the circumgalactic medium (CGM) of the QSO2 host, which has been populated with tidal debris by gal…
NGTS-2b: an inflated hot-Jupiter transiting a bright F-dwarf
Smalley, Barry; Wheatley, Peter J.; Bayliss, Daniel +42 more
We report the discovery of NGTS-2b, an inflated hot-Jupiter transiting a bright F5V star (2MASS J14202949 - 3112074; Teff = 6478^{+94}_{-89} K), discovered as part of the Next Generation Transit Survey (NGTS). The planet is in a P = 4.51 d orbit with mass 0.74^{+0.13}_{-0.12}MJ, radius 1.595^{+0.047}_{-0.045}RJ, an…
A refined search for pulsations in white dwarf companions to millisecond pulsars
Hermes, J. J.; Althaus, Leandro G.; Gianninas, A. +7 more
We present optical high-speed photometry of three millisecond pulsars with low-mass (<0.3 M⊙) white dwarf companions, bringing the total number of such systems with follow-up time-series photometry to five. We confirm the detection of pulsations in one system, the white dwarf companion to PSR J1738+0333, and show that the pulsation f…
The velocity ellipsoid in the Galactic disc using Gaia DR1
Majewski, Steven R.; Anguiano, Borja; Freeman, Kenneth C. +2 more
The stellar velocity ellipsoid of the solar neighbour (d < 200 pc) is re-examined using intermediate-old mono-abundance stellar groups with high-quality chemistry data together with parallaxes and proper motions from Gaia DR1. We find the average velocity dispersion values for the three space velocity components for the thin and thick discs of …
Verifying reddening and extinction for Gaia DR1 TGAS giants
Gontcharov, George A.; Mosenkov, Aleksandr V.
Gaia DR1 Tycho-Gaia Astrometric Solution parallaxes, Tycho-2 photometry, and reddening/extinction estimates from nine data sources for 38 074 giants within 415 pc from the Sun are used to compare their position in the Hertzsprung-Russell diagram with theoretical estimates, which are based on the PARSEC and MIST isochrones and the TRILEGAL model of…