A. Schwope
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View article: A systematic search for orbital periods of polars with TESS
A systematic search for orbital periods of polars with TESS Open
Context . Determining the orbital periods of cataclysmic variable stars (CVs) is essential for confirming candidates and for the understanding of their evolutionary state. The Transiting Exoplanet Survey Satellite (TESS) provides month-lon…
View article: eROSITA-selection of new period-bounce Cataclysmic Variables: First follow-up confirmation using TESS and SDSS
eROSITA-selection of new period-bounce Cataclysmic Variables: First follow-up confirmation using TESS and SDSS Open
Between 40$\%$ and 80$\%$ of cataclysmic variables (CVs) are expected to have evolved past the period-minimum and contain a degenerate donor. However, observational surveys for CVs have only been able to detect a few of these highly evolve…
View article: A star-by-star correspondence between X-ray activity and rotation in the young open cluster NGC 2516 with eROSITA
A star-by-star correspondence between X-ray activity and rotation in the young open cluster NGC 2516 with eROSITA Open
Context . The coronal soft X-ray emission of cool stars, especially when taken in combination with their measured rotation periods, offers insights into their levels of magnetic activity and related transitions. Aims . We study the X-ray p…
View article: A Large Catalog of DA White Dwarf Characteristics Using SDSS and Gaia Observations
A Large Catalog of DA White Dwarf Characteristics Using SDSS and Gaia Observations Open
We present a catalog of 8545 and 19,257 unique DA white dwarfs (WDs) observed in Sloan Digital Sky Survey (SDSS) Data Release 19 and previous SDSS data releases, respectively. This is the largest catalog of both spectroscopic and photometr…
View article: XMM-Newton follow-up of two eROSITA X-ray binary candidates
XMM-Newton follow-up of two eROSITA X-ray binary candidates Open
We report on the follow-up observations with XMM- Newton of two X-ray binary candidates identified in the first eROSITA all-sky survey data (eRASS1), 1eRASS J061330.8 $$+$$ 160440 and 1eRASS J161201.9−464622. Based on the obtained results,…
View article: X-ray and optical analysis of the prototype polar AN UMa
X-ray and optical analysis of the prototype polar AN UMa Open
We present a long-term optical and X-ray photometric study of AN UMa, one of the prototypical polar-type cataclysmic variables, tracing more than 34 years of its accretion history. Observations from both ground-based and space-based facili…
View article: On the Origin of the X-Ray Emission Surrounding PSR B0656+14 in the eROSITA Cal-PV Data
On the Origin of the X-Ray Emission Surrounding PSR B0656+14 in the eROSITA Cal-PV Data Open
We present a cautionary assessment of the extended X-ray emission around PSR B0656+14 in eROSITA Cal-PV data in response to the work of S. Niu et al. The eROSITA point-spread function (PSF) model is known to underestimate emission in the w…
View article: NuSTAR Broadband X-Ray Observation of EF Eri Following its Reawakening into a High Accretion State
NuSTAR Broadband X-Ray Observation of EF Eri Following its Reawakening into a High Accretion State Open
We present the first NuSTAR X-ray observation of EF Eri, a well-known polar system. The NuSTAR observation was conducted in conjunction with NICER shortly after EF Eri entered a high accretion state following an unprecedented period of low…
View article: The eROSITA Final Equatorial Depth Survey (eFEDS)
The eROSITA Final Equatorial Depth Survey (eFEDS) Open
We present one of the largest uniform optical spectroscopic surveys of X-ray selected sources to date that were observed as a pilot study for the Black Hole Mapper (BHM) survey. The BHM program of the Sloan Digital Sky Survey (SDSS)-V is d…
View article: The EXOD search for faint transients in XMM-Newton observations. Part II
The EXOD search for faint transients in XMM-Newton observations. Part II Open
The XMM-Newton observatory has accumulated a vast archive of over 17,000 X-ray observations over the last 25 years. However, the standard data processing pipelines may fail to detect certain types of transient X-ray sources due to their sh…
View article: Searching the non-accreting white dwarf population in eROSITA data
Searching the non-accreting white dwarf population in eROSITA data Open
eROSITA is the soft X-ray instrument aboard the Spectrum Roentgen Gamma (SRG) satellite that is most sensitive in the energy range between 0.2 and 2.3 keV. Between December 2019 and December 2021, eROSITA completed four all-sky surveys pro…
View article: Searching the Non‐Accreting White Dwarf Population in <scp>eROSITA</scp> Data
Searching the Non‐Accreting White Dwarf Population in <span>eROSITA</span> Data Open
eROSITA is the soft X‐ray instrument aboard the Spectrum Roentgen Gamma (SRG) satellite that is most sensitive in the energy range between 0.2 and 2.3 keV. Between December 2019 and December 2021, eROSITA completed four all‐sky surveys, pr…
View article: Cover Picture: Astron. Nachr. 1/2025
Cover Picture: Astron. Nachr. 1/2025 Open
Hunting for white dwarfs in eROSITA surveys 1‐4 with special processing. The Gaia color‐magnitude diagram shows all white dwarf candidates from the Gaia white dwarf catalogue (Gentile Fusillo et al. 2021), colour‐coded with the probability…
View article: Isolated Neutron Stars as Science Validation for <scp>XMM2ATHENA</scp>: Ensuring Robust Data for Future X‐Ray Astronomy
Isolated Neutron Stars as Science Validation for <span>XMM2ATHENA</span>: Ensuring Robust Data for Future X‐Ray Astronomy Open
The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the avai…
View article: Gas thermodynamics meets galaxy kinematics: Joint mass measurements for eROSITA galaxy clusters
Gas thermodynamics meets galaxy kinematics: Joint mass measurements for eROSITA galaxy clusters Open
The mass of galaxy clusters is a critical quantity for probing cluster cosmology and testing theories of gravity, but its measurement could be biased, given that assumptions are inevitable in order to make use of any approach. In this pape…
View article: Catalog of Cataclysmic Variables Around the Period-bounce: New Systems
Catalog of Cataclysmic Variables Around the Period-bounce: New Systems Open
A large portion of cataclysmic variables (CVs), between 40% and 80%, are predicted to be in the last stage of their evolution, becoming period-bouncers. This sub-class of CVs is characterized by having gone through a reversal in the evolut…
View article: A first systematic characterization of cataclysmic variables in SRG/eROSITA surveys
A first systematic characterization of cataclysmic variables in SRG/eROSITA surveys Open
We present an account of known cataclysmic variables (CVs) that were detected as X-ray sources in eROSITA X-ray surveys and have Gaia DR3 counterparts. We address standard CVs with main sequence donors and white dwarfs accreting via Roche-…
View article: A first systematic characterization of cataclysmic variables in SRG/eROSITA surveys
A first systematic characterization of cataclysmic variables in SRG/eROSITA surveys Open
(abridged) We present an account of known cataclysmic variables (CVs) that were detected as X-ray sources in eROSITA X-ray surveys and have Gaia DR3 counterparts. We address standard CVs with main sequence donors and white dwarfs accreting…
View article: Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra
Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra Open
The observed spectra of two dwarf novae, CRTS J080846.2+313106 and V416 Dra, have been uploaded.
View article: Cataclysmic variables from Sloan Digital Sky Survey -- V (2020-2023) identified using machine learning
Cataclysmic variables from Sloan Digital Sky Survey -- V (2020-2023) identified using machine learning Open
SDSS-V is carrying out a dedicated survey for white dwarfs, single and in binaries, and we report the analysis of the spectroscopy of 504 cataclysmic variables (CVs) and CV candidates obtained during the first 34 months of observations of …
View article: Cataclysmic variables around the period-bounce: An eROSITA-enhanced multiwavelength catalog
Cataclysmic variables around the period-bounce: An eROSITA-enhanced multiwavelength catalog Open
Context. Cataclysmic variables (CVs) with degenerate donors that have evolved past the period minimum are predicted to make up a great portion of the CV population, namely, between 40% and 80%. However, either due to shortcomings in the mo…
View article: “Forbidden” stars in the eROSITA all-sky survey: X-ray emission from very late-type giants
“Forbidden” stars in the eROSITA all-sky survey: X-ray emission from very late-type giants Open
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument aboard the Spectrum-Roentgen-Gamma (SRG) mission on X-ray emitting red giants and supergiants. Focusing on stars positioned at high galac…
View article: STONKS: Quasi-real time <i>XMM-Newton</i> transient detection system
STONKS: Quasi-real time <i>XMM-Newton</i> transient detection system Open
Context. Over recent decades, astronomy has entered the era of massive data and real-time surveys. This is improving the study of transient objects – although they still contain some of the most poorly understood phenomena in astrophysics,…
View article: STONKS: Quasi-real time XMM-Newton transient detection system
STONKS: Quasi-real time XMM-Newton transient detection system Open
Over recent decades, astronomy has entered the era of massive data and real-time surveys. This is improving the study of transient objects - although they still contain some of the most poorly understood phenomena in astrophysics, as it is…
View article: Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey
Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey Open
The SRG/eROSITA All-Sky Survey (eRASS) allows for the creation of a complete sample of X-ray dim isolated neutron stars (XDINSs), which will significantly facilitate the study of their population properties, evolution, and connection to ot…
View article: An Eccentric Planet Orbiting the Polar V808 Aurigae
An Eccentric Planet Orbiting the Polar V808 Aurigae Open
We analyze 15 yr of eclipse timings of the polar V808 Aur. The rapid ingress/egress of the white dwarf and bright accretion region provide timings as precise as a few tenths of a second for rapid cadence photometric data. We find that betw…
View article: Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey
Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey Open
The SRG/eROSITA All-Sky Survey (eRASS) allows for the creation of a complete sample of X-ray dim isolated neutron stars (XDINSs), which will significantly facilitate the study of their population properties, evolution, and connection to ot…
View article: Discovery of the magnetic cataclysmic variable XMM J152737.4–205305.9 with a deep eclipse-like feature
Discovery of the magnetic cataclysmic variable XMM J152737.4–205305.9 with a deep eclipse-like feature Open
We report the identification and subsequent examination of a polar-type cataclysmic variable named XMM J152737.4−205305.9 newly discovered with the X-ray Multi-Mirror Mission ( XMM-Newton ). This discovery was made by matching the XMM-Newt…
View article: Compact white dwarf binaries in the combined SRG/eROSITA/SDSS eFEDS survey
Compact white dwarf binaries in the combined SRG/eROSITA/SDSS eFEDS survey Open
Context. X-ray surveys combined with optical follow-up observations are used to generate complete flux-limited samples of the main X-ray emitting source classes. eROSITA on the Spectrum-Roentgen-Gamma mission provides sufficient sensitivit…
View article: An Eccentric Planet Orbiting the Polar V808 Aurigae
An Eccentric Planet Orbiting the Polar V808 Aurigae Open
We analyze 15 years of eclipse timings of the polar V808 Aur. The rapid ingress/egress of the white dwarf and bright accretion region provide timings as precise as a few tenths of a second for rapid cadence photometric data. We find that b…