Search Publications
TIC 278825952: a triply eclipsing hierarchical triple system with the most intrinsically circular outer orbit
Mitnyan, T.; Pál, A.; Maxted, P. F. L. +2 more
We report the discovery of a compact triply eclipsing triple star system in the southern continuous viewing zone of the TESS space telescope. TIC 278825952 is a previously known, but unstudied circular eclipsing binary with a period of 4.781 d with a tertiary component in a wider, circular orbit of 235.55-d period that was found from three sets of…
Inverse-Compton scattering in the resolved jet of the high-redshift quasar PKS J1421-0643
Siemiginowska, A.; Birkinshaw, M.; Worrall, D. M. +3 more
Despite the fact that kpc-scale inverse-Compton (iC) scattering of cosmic microwave background (CMB) photons into the X-ray band is mandated, proof of detection in resolved quasar jets is often insecure. High redshift provides favourable conditions due to the increased energy density of the CMB, and it allows constraints to be placed on the radio …
Searching for ZZ Ceti White Dwarfs in the Gaia Survey
Bergeron, P.; Vincent, Olivier; Lafrenière, David
The Gaia satellite recently released parallax measurements for ∼260,000 high-confidence white dwarf candidates, allowing for precise measurements of their physical parameters. By combining these parallaxes with Pan-STARRS and u-band photometry, we measured the effective temperature and stellar mass for all white dwarfs in the Northern Hemisphere w…
Evidence of Systematic Errors in Spitzer Microlens Parallax Measurements
Bennett, David P.; Koshimoto, Naoki
The microlensing parallax campaign with the Spitzer space telescope aims to measure masses and distances of microlensing events seen toward the Galactic bulge, with a focus on planetary microlensing events. The hope is to measure how the distribution of planets depends on position within the Galaxy. In this paper, we compare 50 microlens parallax …
Diagonal Ridge Pattern of Different Age Populations Found in Gaia-DR2 with LAMOST Main-sequence Turnoff and OB-type Stars
Wang, H. -F.; López-Corredoira, M.; Huang, Y. +5 more
We revisit the diagonal ridge feature (diagonal distributions in the R, vφ plane) found in Gaia and present a timing analysis for it between Galactocentric distances of R = 7.5 and 12 kpc, using main-sequence turnoff and OB stars selected from the LAMOST Galactic spectroscopic surveys. We recover the ridge pattern in the R-vφ…
The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261
Barclay, Thomas; Vanderburg, Andrew; Bieryla, Allyson +30 more
Although the Transiting Exoplanet Survey Satellite (TESS) primary mission observed the northern and southern ecliptic hemispheres, generally avoiding the ecliptic, and the Kepler space telescope during the K2 mission could only observe near the ecliptic, many of the K2 fields extend far enough from the ecliptic plane that sections overlap with TES…
Characterizing the companion AGBs using surface chemical composition of barium stars
Masseron, Thomas; Shejeelammal, J.; Goswami, Aruna +2 more
Barium stars are one of the important probes to understand the origin and evolution of slow neutron-capture process elements in the Galaxy. These are extrinsic stars, where the observed s-process element abundances are believed to have an origin in the now invisible companions that produced these elements at their asymptotic giant branch (AGB) pha…
Structure of the outer Galactic disc with Gaia DR2
López-Corredoira, M.; Chrobáková, Ž.; Nagy, R.
Context. The structure of outer disc of our Galaxy is still not well described, and many features need to be better understood. The second Gaia data release (DR2) provides data in unprecedented quality that can be analysed to shed some light on the outermost parts of the Milky Way.
Aims: We calculate the stellar density using star counts obta…
Dependence of the IRX-β Dust Attenuation Relation on Metallicity and Environment
Shivaei, Irene; Mobasher, Bahram; Scoville, Nick +4 more
We use a sample of star-forming field and protocluster galaxies at z = 2.0-2.5 with Keck/MOSFIRE K-band spectra, a wealth of rest-frame ultraviolet (UV) photometry, and Spitzer/MIPS and Herschel/PACS observations, to dissect the relation between the ratio of infrared (IR) to UV luminosity (IRX) versus UV slope (β) as a function of gas-phase metall…
NIR counterparts to ULXs (III): completing the photometric survey and selected spectroscopic results
Harrison, F. A.; Roberts, T. P.; Torres, M. A. P. +5 more
We present results from the remaining sources in our search for near-infrared (NIR) candidate counterparts to ultraluminous X-ray sources (ULXs) within ≃10 Mpc. We observed 23 ULXs in 15 galaxies and detected NIR candidate counterparts to 6 of them. Two of these have an absolute magnitude consistent with a single red supergiant (RSG). Three counte…