Search Publications
Missions
Journals
Publication Years
Estimating Distances from Parallaxes. VI. A Method for Inferring Distances and Transverse Velocities from Parallaxes and Proper Motions Demonstrated on Gaia Data Release 3
Bailer-Jones, C. A. L.
The accuracy of stellar distances inferred purely from parallaxes degrades rapidly with distance. Proper motion measurements, when combined with some idea of typical velocities, provide independent information on stellar distances. Here, I build a direction- and distance-dependent model of the distribution of stellar velocities in the Galaxy, then…
Temperature of quiet Sun small scale brightenings observed by EUI on board Solar Orbiter: Evidence for a cooler component
Mierla, M.; Zhukov, A. N.; Berghmans, D. +16 more
Context. On May 30, 2020, small and short-lived extreme-UV (EUV) brightenings in the quiet Sun were observed over a four-minute sequence by the EUV channel of the Extreme Ultraviolet Imager - High Resolution Imager (EUIHRIEUV) on board the Solar Orbiter. The brightenings' physical origin and possible impact on coronal or transition regi…
Carbon stars as standard candles - III. Un-binned maximum likelihood fitting and comparison with TRGB estimations
Rousseau-Nepton, Laurie; Heyl, Jeremy; Richer, Harvey +2 more
In the second paper of this series, we developed a new distance determination method using the median J magnitude of carbon-rich asymptotic giant branch stars (CS) as standard candles and the Magellanic Clouds as the fundamental calibrators. The J-band CS luminosity function was modelled using a modified Lorentzian distribution whose parameters we…
High-mass eclipsing binaries: A testbed for models of interior structure and evolution. Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car, and V346 Cen
Southworth, J.; Tkachenko, A.; Van Reeth, T. +2 more
Aims: The surface chemical compositions of stars are affected by physical processes that bring the products of thermonuclear burning to the surface. Despite their potential in helping us understand the structure and evolution of stars, elemental abundances are available for only a few high-mass binary stars. We aim to enlarge this sample by d…
What boost galaxy mergers in two massive galaxy protoclusters at z = 2.24?
Fan, Xiaohui; Cai, Zheng; Zheng, Xian Zhong +10 more
Characterizing the structural properties of galaxies in high-redshift protoclusters is key to our understanding of the environmental effects on galaxy evolution in the early stages of galaxy and structure formation. In this study, we assess the structural properties of 85 and 87 Hα emission-line candidates (HAEs) in the densest regions of two mass…
Evidence of a Massive Stellar Disruption in the X-Ray Spectrum of ASASSN-14li
Ramirez-Ruiz, Enrico; Drake, Jeremy J.; Raymond, John +7 more
The proximity and duration of the tidal disruption event ASASSN-14li led to the discovery of narrow, blueshifted absorption lines in X-rays and UV. The gas seen in X-ray absorption is consistent with bound material close to the apocenter of elliptical orbital paths, or with a disk wind similar to those seen in Seyfert-1 active galactic nuclei. We …
SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/eROSITA + ZTF Search
Szkody, Paula; El-Badry, Kareem; Graham, Matthew J. +24 more
AM Canum Venaticorum (AM CVn) systems are ultracompact binaries where a white dwarf accretes from a helium-rich degenerate or semidegenerate donor. Some AM CVn systems will be among the loudest sources of gravitational waves for the upcoming Laser Interferometer Space Antenna; yet the formation channel of AM CVns remains uncertain. We report the s…
TOI-332 b: a super dense Neptune found deep within the Neptunian desert
Vanderburg, Andrew; Hellier, Coel; Latham, David W. +49 more
To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/radius space known as the 'Neptunian desert', where planets should be easy to find but discoveries remain few. This suggests unusual formation and evolution processes are…
The non-explosive stellar merging origin of the ultra-massive carbon-rich white dwarfs
Vennes, Stéphane; Ferrario, Lilia; Kawka, Adela
We have investigated the origin of a sub-class of carbon-polluted white dwarfs (DQ) originally identified as the "hot DQ" white dwarfs. These objects are relatively hot ($10\, 000\lesssim T_{\rm eff}\lesssim 25\, 000$ K), have markedly higher carbon abundance (C-enriched), are more massive (M ≳ 0.8 M⊙) than ordinary DQs (M ~ 0.6 M⊙…
Evidence for extended gaseous reservoirs around AGN at cosmic noon from ALMA CO(3-2) observations
Maiolino, R.; Fudamoto, Y.; Carniani, S. +3 more
Gaseous outflows are key phenomena in the evolution of galaxies, as they affect star formation (either positively or negatively), eject gas from the core or disc, and directly cause mixing of pristine and processed material. Active outflows may be detected through searches for broad spectral line emission or high-velocity gas, but it is also possi…