121 citations · 1.2k across the 53 of their papers we have counts for
49 papers · 1 filter
Reframing the Wide Eccentric Binary Problem: Eccentricity as a Probe of Mass-transfer Physics
A. Parkosidis, S. Toonen, E. Laplace +1
Observations of wide post-interaction binaries show an unexpected feature; orbital eccentricity, which is not understood theoretically. A promising resolution to this long-standing…
Asteroseismic rotation rates of hot subdwarf B stars hint at transient accretion from leftover common envelope matter
Facundo D. Moyano, Hongwei Ge, Zhanwen Han +6
Asteroseismology enabled measuring the rotation rate in the deep stellar interiors of stars across several evolutionary phases, advancing the theory of angular momentum transport i…
Hidden massive eclipsing binaries in red supergiant systems: The hierarchical triple system KQ Puppis and other candidates
D. Jadlovský, L. Molnár, A. Ercolino +26
The majority of massive stars are part of binary systems that may interact during their evolution. However, not many RSGs are known binaries, and only a few have constrained orbita…
A slowly pulsating run-away B star at high Galactic latitude ejected from a spiral arm
Ulrich Heber, Maximilian Halenke, Aakash Bhat +1
We report the discovery of the young B6V run-away star LAMOST J083323.18+430825.4, 2.5\,kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determ…
A 500 pc volume-limited sample of hot subluminous stars I. Space density, scale height, and population properties
H. Dawson, S. Geier, U. Heber +25
We present the first volume-limited sample of spectroscopically confirmed hot subluminous stars out to 500 pc, defined using the accurate parallax measurements from the {\em Gaia}…
Hot Subdwarfs in Close Binaries Observed from Space III: Reflection Effect Asymmetry Induced by Relativistic Beaming
Brad N. Barlow, Thomas Kupfer, Bryce A. Smith +2
Detailed studies of hot subdwarf B stars with red dwarf or brown dwarf companions can shed light on the effects of binarity on late stellar evolution. Such systems exhibit a strong…
The first massive compact companion in a wide orbit around a hot subdwarf star
S. Geier, M. Dorsch, H. Dawson +5
We report the discovery of the first hot subdwarf B (sdB) star with a massive compact companion in a wide () binary system. It was discovered based on an a…
Hot subdwarfs in close binaries observed from space II: Analysis of the light curves
V. Schaffenroth, B. N. Barlow, I. Pelisoli +2
Hot subdwarfs in close binaries with either M dwarf, brown dwarf or white dwarf companions show unique light variations. In hot subdwarf binaries with M dwarf or brown dwarf compan…
Pulse Timing Discovery of a Three-Day Companion to the Hot Subdwarf BPM 36430
Bryce A. Smith, Brad N. Barlow, Benjamin Rosenthal +2
Hot subdwarf B stars are core-helium burning objects that have undergone envelope stripping, likely by a binary companion. Using high-speed photometry from the Transiting Exoplanet…
Hot subdwarfs in close binaries observed from space I: orbital, atmospheric, and absolute parameters and the nature of their companions
V. Schaffenroth, I. Pelisoli, B. N. Barlow +2
About a third of the hot subdwarfs of spectral type B, which are mostly core-helium burning objects on the extreme horizontal branch, are found in close binaries with cool, low-mas…
Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields
Ingrid Pelisoli, M. Dorsch, U. Heber +6
Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The…
A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor
Ingrid Pelisoli, P. Neunteufel, S. Geier +8
Supernova Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe. They are understood to result from…
Eclipsing Binaries Found by the EREBOS Project: Gaia DR2 6097540197980557440 -- A Deeply Eclipsing sdB+dM System
Kyle A. Corcoran, Brad N. Barlow, Veronika Schaffenroth +3
We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply-eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object dur…
New X-ray observations of the hot subdwarf binary HD49798 / RXJ0648.0-4418
S. Mereghetti, F. Pintore, T. Rauch +7
HD49798 / RXJ0648.0-4418 is the only confirmed X-ray binary in which the mass donor is a hot subdwarf star of O spectral type and, most likely, it contains a massive white dwarf (1…
Mysterious, Variable, and Extremely Hot: White Dwarfs Showing Ultra-High Excitation Lines I. Photometric Variability
Nicole Reindl, Veronika Schaffenroth, Semih Filiz +3
About 10% of all stars exhibit absorption lines of ultra-high excited (UHE) metals (e.g. OVIII) in their optical spectra when entering the white dwarf cooling sequence. The recent…
A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the Gaia era
V. Schaffenroth, S. L. Casewell, D. Schneider +8
Subdwarf B stars are core-helium burning stars located on the extreme horizontal branch. Extensive mass loss on the red giant branch is necessary to form them. It has been proposed…
EPIC 216747137: a new HW Vir eclipsing binary with a massive sdOB primary and a low-mass M-dwarf companion
R. Silvotti, V. Schaffenroth, U. Heber +8
EPIC 216747137 is a new HW~Virginis system discovered by the Kepler spacecraft during its K2 "second life". Like the other HW Vir systems, EPIC 216747137 is a post-common-envelope…
An extremely hot white dwarf with a rapidly rotating K-type subgiant companion: UCAC2 46706450
Klaus Werner, Nicole Reindl, Lisa Löbling +5
UCAC2 46706450 is a late-type star with an ultraviolet (UV) excess. It was considered a candidate to establish a sample of FGK stars with white dwarf (WD) companions that can be us…
Alone but not lonely: Observational evidence that binary interaction is always required to form hot subdwarf stars
Ingrid Pelisoli, Joris Vos, Stephan Geier +2
Hot subdwarfs are core-helium burning stars that show lower masses and higher temperatures than canonical horizontal branch stars. They are believed to be formed when a red giant s…
Formation of sdB-stars via common envelope ejection by substellar companions
M. Kramer, F. R. N. Schneider, S. T. Ohlmann +4
Common envelope (CE) phases in binary systems where the primary star reaches the tip of the red giant branch are discussed as a formation scenario for hot subluminous B-type (sdB)…
An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2-428
N. Reindl, V. Schaffenroth, M. M. Miller Bertolami +5
The nucleus of the planetary nebula Hen2-428 is a short orbital-period (4.2h), double-lined spectroscopic binary, whose status as a potential supernova type Ia progenitor has raise…
The EREBOS project -- Investigating the effect of substellar and low-mass stellar companions on late stellar evolution
V. Schaffenroth, B. N. Barlow, S. Geier +14
Eclipsing post-common envelope binaries are highly important for resolving the poorly understood, very short-lived common envelope phase. Most hot subdwarfs (sdO/Bs) are the bare H…
Revealing the True Nature of Hen 2-428
Nicole Reindl, Nicolle L. Finch, Veronika Schaffenroth +5
The nucleus of Hen 2-428 is a short orbital period (4.2 h) spectroscopic binary, whose status as potential supernovae type Ia progenitor has raised some controversy in the literatu…
The MUCHFUSS photometric campaign
V. Schaffenroth, S. Geier, U. Heber +4
Hot subdwarfs (sdO/Bs) are the helium-burning cores of red giants, which lost almost all of their hydrogen envelopes. This mass loss is often triggered by common envelope interacti…