Search Publications
Upper limits for phosphine (PH3) in the atmosphere of Mars
Patel, M. R.; Montmessin, F.; Irwin, P. G. J. +12 more
Phosphine (PH3) is proposed to be a possible biomarker in planetary atmospheres and has been claimed to have been observed in the atmosphere of Venus, sparking interest in the habitability of Venus's atmosphere. Observations of another biomarker, methane (CH4), have been reported several times in the atmosphere of Mars, hinti…
Multiwavelength analysis of the X-ray spur and southeast of the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Kavanagh, P. J. +5 more
Aims: The giant H II region 30 Doradus (30 Dor) located in the eastern part of the Large Magellanic Cloud is one of the most active star-forming regions in the Local Group. Studies of H I data have revealed two large gas structures which must have collided with each other in the region around 30 Dor. In X-rays there is extended emission (~1 k…
Sensitivity of solar wind mass flux to coronal temperature
Matteini, L.; Owen, C. J.; Baker, D. +4 more
Solar wind models predict that the mass flux carried away from the Sun in the solar wind should be extremely sensitive to the temperature in the corona, where the solar wind is accelerated. We perform a direct test of this prediction in coronal holes and active regions using a combination of in situ and remote sensing observations. For coronal hol…
Comparing the spatial and kinematic distribution of gas and young stars around the shell-like structure in the CMa OB1 association
Lefloch, B.; Montmerle, T.; Gregorio-Hetem, J. +4 more
Context. The relationship between young stellar clusters and their respective parental molecular clouds remains an open issue. Recent inquiries consider the similarities between substructures of clouds and clusters and whether they are a coincidence or, rather, an indication of a physical relationship. To address these issues, we studied the CMa O…
Galactic cosmic ray modulation at Mars and beyond measured with EDACs on Mars Express and Rosetta
Johnstone, A.; Lester, M.; Wimmer-Schweingruber, R. F. +5 more
Galactic cosmic rays (GCRs) are an intrinsic part of the heliospheric radiation environment and an inevitable challenge to long-term space exploration. Here we show solar-cycle-induced GCR modulation at Mars in the period 2005-2020, along with GCR radial gradients, by comparing Mars Express and Rosetta engineering parameters to sunspot number time…
Precise radial velocities of giant stars. XV. Mysterious nearly periodic radial velocity variations in the eccentric binary ε Cygni
Trifonov, Trifon; Reffert, Sabine; Lee, Man Hoi +10 more
Context. Using the Hamilton Échelle Spectrograph at Lick Observatory, we have obtained precise radial velocities (RVs) of a sample of 373 G- and K-giant stars over more than 12 yr, leading to the discovery of several single and multiple planetary systems. The RVs of the long-period (~53 yr) spectroscopic binary ε Cyg (HIP 102488) are found to exhi…
Exploring the pulsational properties of two ZZ Ceti stars
Sódor, Á.; Kalup, Cs.; Bognár, Zs.
Context. We continued our ground-based observing project with the season-long observations of ZZ Ceti stars at the Konkoly Observatory. Our present targets are the newly discovered PM J22299+3024 and the already known LP 119-10 variables. LP 119-10 was also observed by the TESS space telescope in 120-second cadence mode.
Aims: Our main aims a…
Effects of the chromospheric Lyα line profile shape on the determination of the solar wind H I outflow velocity using the Doppler dimming technique
Sasso, C.; Romoli, M.; Andretta, V. +15 more
Context. The determination of solar wind H I outflow velocity is fundamental to shedding light on the mechanisms of wind acceleration occurring in the corona. Moreover, it has implications in various astrophysical contexts, such as in the heliosphere and in cometary and planetary atmospheres.
Aims: We aim to study the effects of the chromosph…
Uncovering the ultimate planet impostor. An eclipsing brown dwarf in a hierarchical triple with two evolved stars
Montesinos, B.; Bouy, H.; Barrado, D. +14 more
Context. Exoplanet searches through space-based photometric time series have shown to be very efficient in recent years. However, follow-up efforts on the detected planet candidates have been demonstrated to be critical to uncover the true nature of the transiting objects.
Aims: In this paper we show a detailed analysis of one of those false …
Extremely weak CO emission in IZw 18
Wang, Junzhi; Zhang, Zhi-Yu; Shi, Yong +1 more
Local metal-poor galaxies are ideal analogues of primordial galaxies with the interstellar medium (ISM) barely being enriched with metals. However, it is unclear whether carbon monoxide remains a good tracer and coolant of molecular gas at low metallicity. Based on the observation with the upgraded Northern Extended Millimeter Array, we report a m…