Search Publications
The nature of 500 micron risers I: SMA observations
Pérez-Fournon, I.; Clements, D. L.; Conley, A. +4 more
We present SMA observations at resolutions from 0.35 to 3 arcsec of a sample of 34 candidate high redshift dusty star forming galaxies (DSFGs). These sources were selected from the HerMES Herschel survey catalogues to have SEDs rising from 250 to 350 to 500 µm, a population termed 500-risers. We detect counterparts to 24 of these sources, wi…
Accurate mass estimates from the proper motions of dispersion-supported galaxies
Bullock, James S.; Lazar, Alexandres
We derive a new mass estimator that relies on internal proper motion measurements of dispersion-supported stellar systems, one that is distinct and complementary to existing estimators for line-of-sight velocities. Starting with the spherical Jeans equation, we show that there exists a radius where the mass enclosed depends only on the projected t…
MADX - a simple technique for source detection and measurement using multiband imaging from the Herschel-ATLAS survey
Dunne, L.; Maddox, S. J.
We describe the method used to detect sources for the Herschel-ATLAS (Herschel Astrophysical Terahertz Large Area Survey) survey. The method is to filter the individual bands using a matched filter, based on the point spread function (PSF) and confusion noise, and then form the inverse variance-weighted sum of the individual bands, including weigh…
A survey for variable young stars with small telescopes: II - mapping a protoplanetary disc with stable structures at 0.15 au
Scholz, Aleks; Eislöffel, Jochen; Dvorak, Shawn +57 more
The HOYS citizen science project conducts long-term, multifilter, high-cadence monitoring of large YSO samples with a wide variety of professional and amateur telescopes. We present the analysis of the light curve of V1490 Cyg in the Pelican Nebula. We show that colour terms in the diverse photometric data can be calibrated out to achieve a median…
An eclipsing M-dwarf close to the hydrogen burning limit from NGTS
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +20 more
We present the discovery of NGTS J0930-18, an extreme mass ratio eclipsing M-dwarf binary system with an early M-dwarf primary and a late M-dwarf secondary close to the hydrogen burning limit. Global modelling of photometry and radial velocities reveals that the secondary component (NGTS J0930-18 B) has a mass of M* = $0.0818 ^{+0.0040}…
Two new nova shells associated with V4362 Sagittarii and DO Aquilae
Boumis, P.; Derlopa, S.; Akras, S. +8 more
A classical nova is an eruption on the surface of a white dwarf in an accreting binary system. The material ejected from the white dwarf surface generally forms an axisymmetric shell. The shaping mechanisms of nova shells are probes of the processes that take place at energy scales between planetary nebulae and supernova remnants. We report on the…
First L band detection of hot exozodiacal dust with VLTI/MATISSE
Kirchschlager, Florian; Ertel, Steve; Matter, Alexis +2 more
For the first time, we observed the emission of hot exozodiacal dust in L band. We used the new instrument MATISSE at the Very Large Telescope Interferometer to detect the hot dust around κ Tuc with a significance of 3σ to 6σ at wavelengths between 3.37 and $3.85\, {\mu {\rm m}}$ and a dust-to-star flux ratio of 5 to $7{{{\ \rm per\ cent}}}$ . We …
First discovery of trans-iron elements in a DAO-type white dwarf (BD-22°3467)
Rauch, T.; Werner, K.; Kruk, J. W. +4 more
We have identified 484 lines of the trans-iron elements (TIEs) Zn, Ga, Ge, Se, Br, Kr, Sr, Zr, Mo, In, Te, I, Xe, and Ba, for the first time in the ultraviolet spectrum of a DAO-type WD, namely BD-22°3467, surrounded by the ionized nebula Abell 35. Our TIE abundance determination shows extremely high overabundances of up to five dex - a…
Colour-magnitude diagrams of transiting exoplanets - III. A public code, nine strange planets, and the role of phosphine
Triaud, Amaury H. M. J.; Dransfield, Georgina
Colour-magnitude diagrams provide a convenient way of comparing populations of similar objects. When well populated with precise measurements, they allow quick inferences to be made about the bulk properties of an astronomic object simply from its proximity on a diagram to other objects. We present here a PYTHON toolkit that allows a user to produ…
Powerful ionized gas outflows in the interacting radio galaxy 4C+29.30
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; Couto, Guilherme S. +2 more
We investigate the ionized gas excitation and kinematics in the inner $4.3\, \times \, 6.2$ kpc2 of the merger radio galaxy 4C+29.30. Using optical integral field spectroscopy with the Gemini North Telescope, we present flux distributions, line-ratio maps, peak velocities and velocity dispersion maps as well as channel maps with a spati…