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BepiColombo mission confirms stagnation region of Venus and reveals its large extent
André, N.; Fedorov, A.; Barabash, S. +42 more
The second Venus flyby of the BepiColombo mission offer a unique opportunity to make a complete tour of one of the few gas-dynamics dominated interaction regions between the supersonic solar wind and a Solar System object. The spacecraft pass through the full Venusian magnetosheath following the plasma streamlines, and cross the subsolar stagnatio…
Interferometric Imaging, and Beam-Formed Study of a Moving Type-IV Radio Burst with LOFAR
Kumari, Anshu; Zucca, Pietro; Kim, Sujin +6 more
Type-IV radio bursts have been studied for over 50 years. However, the specifics of the radio emission mechanisms is still an open question. In order to provide more information about the emission mechanisms, we studied a moving Type-IV radio burst with fine structures (spike group) by using the high-resolution capability of the Low-Frequency Arra…
A multiwavelength study of the H II region G347.600 + 00.211 and its effects on the surrounding medium
Molina Lera, J. A.; Gamen, R.; Cichowolski, S. +3 more
We present a multiwavelength investigation of the H II region G347.600+00.211, located at a distance of 7.9 kpc. We analyse the gas and dust properties aiming to disentangle the origin of the region as well as its role in the formation of new stars. G347.600 + 00.211 is very conspicuous at 1420 MHz and infrared wavelengths, showing an incomplete s…
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…