371 citations · 605 across the 13 of their papers we have counts for
13 papers
eROSITA's cool star population explained
J. H. M. M. Schmitt, P. C. Schneider, S. Czesla +2
The rotation-activity connection is the standard paradigm for interpreting chromospheric and coronal activity in late-type stars, namely, stars with outer convection zones. This pa…
X-ray counterparts to stellar MeerKAT Galactic-plane compact radio sources
O. D. Egbo, P. J. Groot, D. A. H. Buckley +5
Radio emission from magnetically active stars arises mainly from non-thermal processes and complements high-energy X-ray emission. Sensitive, wide-field radio and X-ray surveys now…
The stellar corona-chromosphere connection. A comprehensive study of X-ray and Ca II IRT fluxes from eROSITA and Gaia
S. Freund, S. Czesla, B. Fuhrmeister +4
Stellar activity can be observed at different wavelengths in a variety of different activity indicators. We investigated the correlation between coronal and chromospheric emissions…
Coronal and chromospheric activity of Teegarden's star
B. Fuhrmeister, J. H. M. M. Schmitt, A. Reienrs +10
Teegarden's star is a late-type M-dwarf planet host, typically showing only rather low levels of activity. In this paper we present an extensive characterisation of this activity a…
SRG/eROSITA 3D mapping of the ISM using X-ray absorption spectroscopy
E. Gatuzz, J. Wilms, A. Zainab +6
We present a detailed study of the hydrogen density distribution in the local interstellar medium (ISM) using the X-ray absorption technique. Hydrogen column densities were precise…
The SRG/eROSITA all-sky survey -- Identifying the coronal content with HamStar
S. Freund, S. Czesla, P. Predehl +6
The first eROSITA all-sky survey (eRASS1) performed on board the Spectrum-Roentgen-Gamma mission (SRG) provides more than 900,000 X-ray sources in the 0.2 - 2.3 keV band located in…
The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
A. Merloni, G. Lamer, T. Liu +142
The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019, with the aim of producing all-sky X-ray source lists and sk…
''Forbidden" stars in the eROSITA all-sky survey: X-ray emission from very late-type giants
J. H. M. M. Schmitt, M. Hünsch, P. C. Schneider +4
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument onboard the Spectrum-Roentgen-Gamma (SRG) mission on X-ray emitting red giants…
The high-energy environment of the heavy sub-Earth GJ 367 b indicates likely complete evaporation of its atmosphere
K. Poppenhaeger, L. Ketzer, N. Ilic +5
The planet GJ 367 b is a recently discovered high-density sub-Earth orbiting an M dwarf star. Its composition was modelled to be predominantly iron with a potential remainder of a…
The CARMENES search for exoplanets around M dwarfs. Behaviour of the Paschen lines during flares and quiescence
B. Fuhrmeister, S. Czesla, J. H. M. M. Schmitt +17
The hydrogen Paschen lines are known activity indicators, but studies of them in M~dwarfs during quiescence are as rare as their reports in flare studies. This situation is mostly…
The X-ray view of the Hyades cluster: updated
S. Freund, J. Robrade, P. C. Schneider +1
We revisit the X-ray properties of the main-sequence Hyades members and the relation between X-ray emission and stellar rotation. As input catalog for Hyades members, we combined t…
Swift UVOT near-UV transit observations of WASP-121 b
M. Salz, P. C. Schneider, L. Fossati +3
Close-in gas planets are subject to continuous photoevaporation that can erode their volatile envelopes. Today, ongoing mass loss has been confirmed in a few individual systems via…
Energy-limited escape revised
M. Salz, P. C. Schneider, S. Czesla +1
Gas planets in close proximity to their host stars experience photoevaporative mass loss. The energy-limited escape concept is generally used to derive estimates for the planetary…