Search Publications
Changes in granulation scales over the solar cycle seen with SDO/HMI and Hinode/SOT
Malherbe, J. M.; Roudier, T.; Ballot, J. +1 more
Context. The Sun is the only star where the superficial turbulent convection can be observed at very high spatial resolution. The Solar Dynamics Observatory (SDO) has continuously observed the full Sun from space with multi-wavelength filters since July 2010. In particular, the Helioseismic and Magnetic Imager (HMI) instrument takes high-cadence f…
Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole
Bondi, M.; Prandoni, I.; Franco, M. +19 more
Aims: We investigate the radio properties of a sample of 850 µm-selected sources from the SCUBA-2 Cosmology Legacy Survey (S2CLS) using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency Array. This sample consists of 53 sources, 41 of which are detected at >5σ at 150 MHz.
Methods: Combining t…
X-ray and ultraviolet observations of the eclipsing cataclysmic variables OV Bootis and SDSS J103533.02+055158.3 with degenerate donors
Schwope, Axel; Traulsen, Iris; Worpel, Hauke
Context. The majority of cataclysmic variables are predicted to be post-period minimum systems with degenerate donor stars, the period bouncers. Owing to their intrinsic faintness, however, only a handful of these systems have so far been securely identified.
Aims: We want to study the X-ray properties of two eclipsing period bouncers, OV Boo…
Characterization of dense Planck clumps observed with Herschel and SCUBA-2
Juvela, M.; Montillaud, J.; Traficante, A. +15 more
Context. Although the basic processes of star formation (SF) are known, more research is needed on SF across multiple scales and environments. The Planck all-sky survey provided a large catalog of Galactic cold clouds and clumps that have been the target of several follow-up surveys.
Aims: We aim to characterize a diverse selection of dense, …
Solar Orbiter's encounter with the tail of comet C/2019 Y4 (ATLAS): Magnetic field draping and cometary pick-up ion waves
Fedorov, A.; Livi, S.; Müller, D. +36 more
Context. Solar Orbiter is expected to have flown close to the tail of comet C/2019 Y4 (ATLAS) during the spacecraft's first perihelion in June 2020. Models predict a possible crossing of the comet tails by the spacecraft at a distance from the Sun of approximately 0.5 AU.
Aims: This study is aimed at identifying possible signatures of the int…
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…