Search Publications
Galactic Winds across the Gas-rich Merger Sequence. II. Lyα Emission and Highly Ionized O VI and N V Outflows in Ultraluminous Infrared Galaxies
Tripp, Todd M.; Veilleux, Sylvain; Liu, Weizhe +3 more
This paper is the second in a series aimed at examining the gaseous environments of z ≤ 0.3 quasars and ultraluminous infrared galaxies (ULIRGs) as a function of AGN/host galaxy properties across the merger sequence. This second paper focuses on the Lyα emission and O VI 1032, 1038 and N V 1238, 1243 absorption features, tracers of highly ionized …
The puzzling story of flare inactive ultra fast rotating M dwarfs. II. Searching for radial velocity variations
Ramsay, Gavin; Hakala, Pasi; Doyle, Lauren +2 more
Observations made using TESS revealed a sample of low-mass stars which show a periodic modulation on a period <0.2 d. Surprisingly, many of these ultra fast rotating (UFR) stars showed no evidence of flare activity which would be expected from such rapidly rotating stars. We present results from a spectroscopic survey of UFRs using the Nordic O…
A New Third Planet and the Dynamical Architecture of the HD 33142 Planetary System
Trifonov, Trifon; Stock, Stephan; Henning, Thomas +24 more
Based on recently-taken and archival HARPS, FEROS, and HIRES radial velocities (RVs), we present evidence for a new planet orbiting the first ascent red giant star HD 33142 (with an improved mass estimate of M1.52 ± 0.03 M ⊙), already known to host two planets. We confirm the Jovian-mass planets HD 33142b and c, with periods of P b…
A list of 49 new stellar twins from the Kepler catalogue of eclipsing binary stars
Bakış, Volkan; Yücel, Gökhan
49 new eclipsing twin binary candidates are identified and analysed based on the Kepler eclipsing binary light curves. Their colours and spectral types are calculated according to our classification. A comparison of the spectral type distribution of eclipsing twin binary systems showed that F-type twins dominate among others, which agrees well wit…
Photometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects
Moór, Attila; Ábrahám, Péter; Kóspál, Ágnes +18 more
Young stars show variability on different time-scales from hours to decades, with a range of amplitudes. We studied two young stars, which triggered the Gaia Science Alerts system due to brightenings on a time-scale of a year. Gaia20bwa brightened by about half a magnitude, whereas Gaia20fgx brightened by about two and half magnitudes. We analysed…
CORALIE radial-velocity search for companions around evolved stars (CASCADES). III. A new Jupiter host-star: in-depth analysis of HD 29399 using TESS data
Buldgen, G.; Eggenberger, P.; Ségransan, D. +11 more
Context. Increasing the number of detected exoplanets is far from anecdotal, especially for long-period planets that require a long duration of observation. More detections imply a better understanding of the statistical properties of exoplanet populations, and detailed modelling of their host stars also enables thorough discussions of star-planet…
Martian atmospheric water vapor abundances in MY26-30 from Mars Express PFS/LW observations
Pankine, Alexey A.
I report on retrievals of water vapor abundances in the Martian atmosphere using observations by Planetary Fourier Spectrometer Long Wavelength channel (PFS/LW) aboard the Mars Express (MEx) spacecraft. PFS/LW observations used in this work cover almost 4 Martian Years from Ls ~ 331° in MY26 (January 2004) to Ls ~ 209° in MY3…
A Catalog of LAMOST Variable Sources Based on Time-domain Photometry of ZTF
Mei, Ying; Wang, Feng; Deng, Hui +4 more
The identification and analysis of different variable sources is a hot topic in astrophysical research. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic survey has accumulated a mass of spectral data but contains no information about variable sources. Although a few related studies present variable source catalo…
Role of Topocentric Parallax in Near-Earth Object Initial Orbit Determination
Zhai, Chengxing; Shao, Michael; Saini, Navtej S. +5 more
Near-Earth Object (NEO) initial orbit determination typically uses astrometric measurements during a close approach over a time window much shorter than the orbital period of the NEO. The initial orbit is only weakly determined with dominant uncertainties in the distance of the NEO from the Earth. Topocentric astrometric measurements allow us to e…
Post-Newtonian gravity and Gaia-like astrometry. Effect of PPN γ uncertainty on parallaxes
Bucciarelli, Beatrice; Lattanzi, Mario G.; Crosta, Mariateresa +3 more
Context. Relativistic models of light propagation adopted for high-precision astrometry are based on the parametrised post-Newtonian formalism, which provides a framework for examining the effects of a hypothetical violation of general relativity on astrometric data. Astrometric observations are strongly affected by the post-Newtonian (PPN) parame…