Search Publications
A catalogue of Galactic supernova remnants in the far-infrared: revealing ejecta dust in pulsar wind nebulae
De Looze, I.; Rho, J.; Dunne, L. +7 more
We search for far-infrared counterparts of known supernova remnants (SNRs) in the Galactic plane (10° < |l| < 60°) at 70-500 µm using the Herschel Infrared Galactic Plane Survey (Hi-GAL). Of 71 sources studied, we find that 29 (41 per cent) SNRs have a clear FIR detection of dust emission associated with the SNR. Dust from 8 of these i…
Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
Molina, D.; Bretton, M.; Jones, H. R. A. +34 more
We homogeneously analyse ∼3.2 × 105 photometric measurements for ∼1100 transit light curves belonging to 17 exoplanet hosts. The photometric data cover 16 years (2004-2019) and include amateur and professional observations. Old archival light curves were reprocessed using up-to-date exoplanetary parameters and empirically debiased limb-…
Constraining the evolution of stellar rotation using solar twins
Bedell, Megan; Meléndez, Jorge; Bean, Jacob L. +7 more
The stellar rotation versus age relation is commonly considered a useful tool to derive reliable ages for Sun-like stars. However, in the light of Kepler data, the presence of apparently old and fast rotators that do not obey the usual gyrochronology relations led to the hypothesis of weakened magnetic breaking in some stars. In this letter, we co…
Searching for the GD-1 stream progenitor in Gaia DR2 with direct N-body simulations
Bovy, Jo; Webb, Jeremy J.
We perform a large suite of direct N-body simulations aimed at revealing the location of the progenitor, or its remnant, of the GD-1 stream. Data from Gaia DR2 reveal that the GD-1 stream extends over ≈100°, allowing us to determine the stream's leading and trailing ends. Our models suggest that the length of the stream is consistent with a dynami…
The magnetic early B-type Stars II: stellar atmospheric parameters in the era of Gaia
Wade, G. A.; Neiner, C.; Shultz, M. E. +6 more
Atmospheric parameters determined via spectral modelling are unavailable for many of the known magnetic early B-type stars. We utilized high-resolution spectra together with non-local thermodynamic equilibrium models to measure effective temperatures Teff and surface gravities log g of stars for which these measurements are not yet avai…
Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types
Bechtol, K.; Smith, M.; Abbott, T. M. C. +46 more
In this paper we present a catalogue of 11 745 brown dwarfs with spectral types ranging from L0 to T9, photometrically classified using data from the Dark Energy Survey (DES) year 3 release matched to the Vista Hemisphere Survey (VHS) DR3 and Wide-field Infrared Survey Explorer (WISE) data, covering ≈2400 deg2 up to iAB = 22.…
Strong lensing reveals jets in a sub-microJy radio-quiet quasar
Jackson, N.; Sluse, D.; Stacey, H. R. +2 more
We present e-MERLIN and European VLBI Network observations which reveal unambiguous jet activity within radio-quiet quasar HS 0810+2554. With an intrinsic flux density of 880 nJy, this is the faintest radio source ever imaged. The findings present new evidence against the idea that radio-loud and radio-quiet quasars are powered by different underl…
The haloes and environments of nearby galaxies (HERON) - I. Imaging, sample characteristics, and envelope diameters
Sales, Laura; Kormendy, John; Rich, R. Michael +16 more
We use a dedicated 0.7-m telescope to image the haloes of 119 galaxies in the Local Volume to µr ∼ 28-30 mag arcsec-2. The sample is primarily from the Two Micron All Sky Survey Large Galaxy Atlas (Jarrett et al. 2003) and extended to include nearby dwarf galaxies and more distant giant ellipticals, and spans fully the …
The VISCACHA survey - I. Overview and first results
Piatti, Andrés E.; Barbuy, Beatriz; Bica, Eduardo +15 more
The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA) Survey is an ongoing project based on deep photometric observations of Magellanic Cloud star clusters, collected using the SOuthern Astrophysical Research (SOAR) telescope together with the SOAR Adaptive Module Imager. Since 2015 more than 200 h of telescope time were …
Evidence for an emerging disc wind and collimated outflow during an X-ray flare in the narrow-line Seyfert 1 galaxy Mrk 335
Kriss, G. A.; Fabian, A. C.; Pinto, C. +13 more
A triggered 140{ ks}XMM-Newton observation of the narrow-line Seyfert 1 (NLS1) Mrk 335 in 2015 December caught the active galaxy at its lowest X-ray flux since 2007. The NLS1 is relatively quiescent for the first {∼ }120{ ks} of the observation before it flares in brightness by a factor of about five in the last 20{ ks}. Although only part of the …