Search Publications
Heliospheric modulation of the interstellar dust flow on to Earth
Krüger, H.; Srama, R.; Grün, E. +3 more
Aims: Based on measurements by the Ulysses spacecraft and high-resolution modelling of the motion of interstellar dust (ISD) through the heliosphere we predict the ISD flow in the inner planetary system and on to the Earth. This is the third paper in a series of three about the flow and filtering of the ISD.
Methods: Micrometer- and sub-…
Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars
Codella, C.; Bianchi, E.; Ceccarelli, C. +7 more
Methanol is a key species in astrochemistry because it is the most abundant organic molecule in the interstellar medium and is thought to be the mother molecule of many complex organic species. Estimating the deuteration of methanol around young protostars is of crucial importance because it highly depends on its formation mechanisms and the physi…
TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ 143 and two Neptunes around HD 23472
Trifonov, Trifon; Kürster, Martin; Rybizki, Jan
Aims: We aim at the discovery of new planetary systems by exploiting the transit light-curve results from observations made in TESS orbital observatory Sectors 1 and 2 and validating them with precise Doppler measurements obtained from archival HARPS data.
Methods: Taking advantage of the reported TESS transit events around GJ 143 (TOI 1…
Abundances of disk and bulge giants from high-resolution optical spectra. III. Sc, V, Cr, Mn, Co, Ni
Schultheis, M.; Ryde, N.; Jönsson, H. +2 more
Context. The formation and evolution of the Galactic bulge and the Milky Way is still a debated subject. Observations of the X-shaped bulge, cylindrical stellar motions, and the presumed existence of a fraction of young stars in the bulge have suggested that it formed through secular evolution of the disk and not through gas dissipation and/or mer…
Hint of curvature in the orbital motion of the exoplanet 51 Eridani b using 3 yr of VLT/SPHERE monitoring
Rouan, D.; Ménard, F.; Avenhaus, H. +49 more
Context. The 51 Eridani system harbors a complex architecture with its primary star forming a hierarchical system with the binary GJ 3305AB at a projected separation of 2000 au, a giant planet orbiting the primary star at 13 au, and a low-mass debris disk around the primary star with possible cold and warm components inferred from the spectral ene…
Simultaneous Kepler/K2 and XMM-Newton observations of superflares in the Pleiades
Antoniou, V.; Micela, G.; Stauffer, J. +10 more
Context. Flares are powerful events ignited by a sudden release of magnetic energy which triggers a cascade of interconnected phenomena, each resulting in emission in different electromagnetic bands. In fact, in the Sun flares are observed across the whole electromagnetic spectrum. Multi-band observations of stellar flares are instead rare. This l…
First stellar spectroscopy in Leo P
Lennon, D. J.; Bastian, N.; Cioni, M. -R. L. +11 more
We present the first stellar spectroscopy in the low-luminosity (MV ∼ -9.3 mag), dwarf galaxy Leo P. Its significantly low oxygen abundance (3% solar) and relative proximity (∼1.6 Mpc) make it a unique galaxy in which to investigate the properties of massive stars with near-primordial compositions akin to those in the early Universe. Fr…
Molecular tracers of radiative feedback in Orion (OMC-1). Widespread CH+ (J = 1-0), CO (10-9), HCN (6-5), and HCO+ (6-5) emission
Cernicharo, José; Bron, Emeric; Goicoechea, Javier R. +4 more
Young massive stars regulate the physical conditions, ionization, and fate of their natal molecular cloud and surroundings. It is important to find tracers that quantify the stellar feedback processes that take place on different spatial scales. We present 85 arcmin2 velocity-resolved maps of several submillimeter molecular lines, taken…
HD 219666 b: a hot-Neptune from TESS Sector 1
Alonso, R.; Bouchy, F.; Deeg, H. +73 more
We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M⋆ = 0.92 ± 0.03 M⊙, R⋆ = 1.03 ± 0.03 R⊙, τ⋆ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊕, a radius of Rb = 4.71 ± 0.17 R…
Black hole mass estimates in quasars. A comparative analysis of high- and low-ionization lines
Bon, E.; Marziani, P.; Bon, N. +7 more
Context. The inter-line comparison between high- and low-ionization emission lines has yielded a wealth of information on the structure and dynamics of the quasar broad line region (BLR), including perhaps the earliest unambiguous evidence in favor of a disk + wind structure in radio-quiet quasars.
Aims: We carried out an analysis of the C IV…