Search Publications
SkyMapper Southern Survey: Data release 4
Wolf, Christian; Tonry, John L.; Onken, Christopher A. +5 more
We present the fourth data release (DR4) of the SkyMapper Southern Survey (SMSS), the last major step in our hemispheric survey with six optical filters: u, v, g, r, i, z. SMSS DR4 covers 26 000 deg
The Sydney Radio Star Catalogue: Properties of radio stars at megahertz to gigahertz frequencies
Stelzer, Beate; Das, Barnali; Pope, Benjamin J. S. +13 more
We present the Sydney Radio Star Catalogue, a new catalogue of stars detected at megahertz to gigahertz radio frequencies. It consists of 839 unique stars with 3 405 radio detections, more than doubling the previously known number of radio stars. We have included stars from large area searches for radio stars found using circular polarisation sear…
VaTEST III: Validation of eight potential super-earths from TESS data
Barclay, Thomas; Tan, Thiam-Guan; Schlieder, Joshua E. +39 more
NASA's all-sky survey mission, the Transiting Exoplanet Survey Satellite (TESS), is specifically engineered to detect exoplanets that transit bright stars. Thus far, TESS has successfully identified approximately 400 transiting exoplanets, in addition to roughly 6 000 candidate exoplanets pending confirmation. In this study, we present the results…
On the existence of `Maia variables'
Jayaraman, Rahul; Ozuyar, Dogus; Handler, Gerald +5 more
There are different classes of pulsating stars in the H-R diagram. While many of those classes are undisputed, some remain a mystery such as the objects historically called `Maia variables'. Whereas the presence of such a class was suggested seven decades ago, no pulsational driving mechanism is known that could excite short-period oscillations in…
A jet-induced shock in a young, powerful radio galaxy at z = 3.00
Noirot, Gaël; Gupta, Anshu; Emonts, Bjorn +9 more
The bright radio source, GLEAM J091734 - 001243 (hereafter GLEAM J0917 - 0012), was previously selected as a candidate ultra-high redshift ( z > 5 ) radio galaxy due to its compact radio size and faint magnitude ( K(AB)=22.7 ). Its redshift was not conclusively determined from follow-up millimetre and near-infrared spectroscopy. Here we present…
Comparative study of the W UMa type binaries S Ant and ε CrA
Erdem, Ahmet; Bakış, Volkan; Blackford, Mark G. +6 more
Contact binaries challenge contemporary stellar astrophysics with respect to their incidence, structure, and evolution. We explore these issues through a detailed study of two bright examples: S Ant and $\varepsilon$ CrA, that permit high-resolution spectroscopy at a relatively good S/N ratio. The availability of high-quality photometry, including…
At the same age, metallicity, and alpha-enhancement, sodium is a more effective tracer of the young and old sequences of the Milky Way disc
Buder, Sven; Owusu, Evans Kojo; Ruiter, Ashley J. +2 more
Trends in elemental enrichment with stellar age can give us a powerful avenue to identify thus far unexplained origin sites of the elements. We investigate stellar abundance trends using the GALAH DR3 high-resolution spectroscopic dataset of 6 234 solar-type stars. Our study explores the elemental abundance [X/Fe] of sodium (Na) with stellar age. …
AllBRICQS: The All-sky BRIght, Complete Quasar Survey
Wolf, Christian; Lai, Samuel; Onken, Christopher A. +3 more
We describe the first results from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), which aims to discover the last remaining optically bright quasars. We present 156 spectroscopically confirmed quasars (140 newly identified) having $|b|>10^{\circ}$ . 152 of the quasars have Gaia DR3 magnitudes brighter than $BP=16.5$ or $R
Detection of radio emission from stars via proper-motion searches
Lenc, Emil; Murphy, Tara; Heald, George +4 more
We present a method for identifying radio stellar sources using their proper-motion. We demonstrate this method using the FIRST, VLASS, RACS-low and RACS-mid radio surveys, and astrometric information from Gaia Data Release 3. We find eight stellar radio sources using this method, two of which have not previously been identified in the literature …
M dwarfs found in the first Byurakan spectral sky survey database. Gaia EDR3 and TESS data. Some preliminary results
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +5 more
In order to gain more information on the 236 M dwarfs identified in the First Byurakan Survey (FBS) low-resolution (lr) spectroscopic database, Gaia EDR3 high-accuracy astrometric and photometric data and Transiting Exoplanet Survey Satellite (TESS) data are used to characterise these M dwarfs and their possible multiplicity. Among the sample of 2…