Search Publications
Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +1 more
Context. Mass loss at the asymptotic giant branch (AGB) plays an important role not only in the final fates of stars, but also in the chemical evolution of galaxies. Nevertheless, the metallicity effects on AGB mass loss are not yet fully understood.
Aims: We present spatially resolved observations of an AGB star, V3, in the metal-poor globul…
THEMIS observations of compressional Pc5 pulsations in the dawn- and duskside magnetosphere
Sibeck, D. G.; Korotova, G. I.
We present case and statistical studies of compressional Pc5 pulsations observed by the THEMIS spacecraft in the dawn- and duskside magnetosphere from 2007 to 2011. A case study provides evidence for compressional Pc5 pulsations in the dawnside magnetosphere following the arrival of particles injected by a substorm and the subsequent growth of the…
Mitigating astrometric bias in barycentric correction with PEXO
Feng, Fabo; Rui, Yicheng
Extremely precise radial velocity is essential for the detection of sub-m s-1 radial velocity of stars induced by Earth-like planets. Although modelling of the barycentric correction of radial velocity could achieve 1 mm s-1 precision, the input astrometry could be biased due to non-linear motions of stars caused by companion…
Revisiting the warm sub-Saturn TOI-1710b. The impact of stellar activity on the mass measurement
Pallé, E.; Nowak, G.; Winn, J. N. +37 more
The Transiting Exoplanet Survey Satellite (TESS) provides a continuous suite of new planet candidates that need confirmation and precise mass determination from ground-based observatories. This is the case for the G-type star TOI-1710, which is known to host a transiting sub-Saturn planet (Mp = 28.3 ± 4.7 M⊕) in a long-period…
X-raying the wind-wind collisions in HD 168112 and HD 167971
Blomme, R.; Nazé, Y.; Rauw, G. +1 more
The O-type long-period binary HD 168112 and triple HD 167971 star systems have been known for several decades for their non-thermal synchrotron radio emission. This emission arises from relativistic electrons accelerated in the hydrodynamic shocks of the wind collisions in these systems. Such wind collisions are expected to produce a strong X-ray …
Seasonal variation in atmospheric optical depth (AOD) and thermal inertia (TI) inter-relationship over Martian Gale crater
Shaheen, Farzana; Krishna, A. P.; Nee Lala, Mili Ghosh +1 more
Investigating the relationship between thermal inertia (TI) and aerosol optical depth (AOD) is significant in giving insights into the seasonality of dust deposition and lifting phenomenon. The present study focuses on establishing a relationship of AOD with TI and different particle sizes over different Martian seasons. Two different Martian land…
Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE
Schultheis, M.; Minniti, D.; Valentini, M. +22 more
Context. Stars presently identified in the bulge spheroid are probably very old, and their abundances can be interpreted as due to the fast chemical enrichment of the early Galactic bulge. The abundances of the iron-peak elements are important tracers of nucleosynthesis processes, in particular oxygen burning, silicon burning, the weak s-process, …
Photospheric Stereoscopy: Direct Estimation of Solar Surface-Height Variations
Hirzberger, Johann; Solanki, Sami K.; Inhester, Bernd +1 more
The orbit of the Solar Orbiter mission carries it and the Polarimetric and Helioseismic Imager (PHI), which is onboard, away from the Sun–Earth line, opening up the first ever possibility of doing stereoscopy of solar photospheric structures. We present a method for a stereoscopic analysis of the height variations in the solar photosphere. This me…
On Possible Additional Sources of Solar Protons in the Events of September 4–10, 2017
Struminsky, A. B.; Grigor'eva, I. Yu.; Ozheredov, V. A.
The article considers the period from September 4 to September 10, 2017, inclusive, during which the last proton events of solar cycle 24 occurred. In order to detect possible additional proton sources and verify the sources already listed in various catalogs, we apply an empirical method for predicting proton events to all solar flares detected d…
Statistics of Solar White-light Flares. I. Optimization and Application of Identification Methods
Hou, Yijun; Li, Ting; Liu, Jifeng +1 more
White-light flares (WLFs) are energetic activity in the stellar atmosphere. However, observed solar WLFs are relatively rare compared to stellar WLFs or solar flares observed at other wavelengths, which limits our further understanding of solar/stellar WLFs through statistical studies. By analyzing flare observations from the Solar Dynamics Observ…