14.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR588 papers
- California Institute of TechnologyUS572 papers
- Massachusetts Institute of TechnologyUS568 papers
- University of MichiganUS494 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT453 papers
- Pennsylvania State UniversityUS448 papers
- University of Maryland, College ParkUS416 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR412 papers
- Max Planck Institute for Gravitational PhysicsDE394 papers
- National Institute for Subatomic PhysicsNL388 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma IIT372 papers
- Goddard Space Flight CenterUS364 papers
157 papers · 1 filter
Classical Nova V1405 Cas Had and so is Unlikely to be a Type Ia Supernova Progenitor
Bradley E. Schaefer
Nova 2021 Cassiopeia (V1405 Cas) was an ordinary J(175) neon nova with the white dwarf mass estimated to be =0.600.10 . I found an orbital period of …
A Minute-Cadence Deep Bulge Survey: First Data Release of DREAMS
Hongjing Yang, Weicheng Zang, Francisco Valdes +31
The DECam Rogue Earths and Mars Survey (DREAMS), a NOIRLab survey program, has been conducting a three-year survey covering a 5 deg area in the Galactic bulge (roughly spanning…
Orbital Period Changes of Recurrent Nova T Pyxidis Demonstrate that M_ejecta >> 11.3xM_accreted and Is Not a Type Ia Supernova Progenitor
Bradley E. Schaefer
Recurrent nova (RN) T Pyxidis (T Pyx) has a complex history of mass accreting-onto and ejection-from the white dwarf, with a classical nova eruption around 1866 kick-starting a RN-…
Symbiotic Stars (Including T Corona Borealis) Are Not Immediate Progenitors of Normal Type Ia Supernovae
Bradley E. Schaefer
A popular solution to the Type Ia supernova (SNIa) progenitor problem is that the immediate progenitors are symbiotic star systems. This solution requires that the companion star o…
Comprehensive Listing of 208 Nova White Dwarf Masses As the Primary Determinant of Spectral-Class and Light-Curve-Class
Bradley E. Schaefer
For Galactic novae, I calculate and collect a comprehensive catalog of 208 measures of white dwarf (WD) masses () and 232 measures of average magnitudes in quiescen…
FQ Circini: An Ordinary Nova with a High-mass B1 V(n)(e) Companion Whose Decretion Disk Transfers Mass to the White Dwarf via Roche-Lobe Overflow
Bradley E. Schaefer, Andrew Pearce, Tom Love +4
FQ Cir was an ordinary fast He/N classical nova, peaking at =10.9. The pre-eruption and post-eruption counterpart was at =14.0, making the smallest known classical nova ampli…
HWO Target Stars and Systems: A Prioritized Community List of Potential Stellar Targets for the Habitable Worlds Observatory's ExoEarth Survey
Noah W. Tuchow, Caleb K. Harada, Eric E. Mamajek +9
The HWO Target Stars and Systems 2025 (TSS25) list is a community-developed catalog of potential stellar targets for the Habitable Worlds Observatory (HWO) in its survey to directl…
Orbital Period Changes of Recurrent Nova U Scorpii Demonstrate that M=26M and Is Not a Type Ia Supernova Progenitor
Bradley E. Schaefer, Gordon Myers
Recurrent nova U Scorpii (U Sco) is one of the prototypes for a Type Ia supernova progenitor. The logic is that the white dwarf is near the Chandrasekhar mass and gas is accumulati…
Orbital Period Changes in Recurrent Nova T Corona Borealis Prove That It Is Not a Type Ia Supernovae Progenitor
Bradley E. Schaefer
T Corona Borealis (T CrB) is a recurrent nova and a symbiotic star that is commonly highlighted as the best case for being a progenitor of a Type Ia supernova (SNIa) within the fra…
Visualizing the mass transfer flow in direct-impact accretion
Juhan Frank, Alexander Straub, Sagiv Shiber +6
We use a variety of visualization techniques to display the interior and surface flows in a double white dwarf binary undergoing direct-impact mass transfer and evolving dynamicall…
Evolutionary Period Changes for 25 X-ray Binaries and the Measurement of an Empirical Universal Law for Angular Momentum Loss in Accreting Binaries
Bradley E. Schaefer
I measure and collect timings of phase markers (like eclipse times) for the orbits of 25 X-ray binaries (XRBs) so as to calculate the steady evolutionary period change ().…
The Unique Helium Nova V445 Puppis Ejected 0.001 M in the Year 2000 and Will Not Become a Type Ia Supernova
Bradley E. Schaefer
V445 Puppis is the only known example of a helium nova, where a layer of helium-rich gas accretes onto the surface of a white dwarf in a cataclysmic variable, with runaway helium b…
Recurrent Nova V2487 Oph Had Superflares in 1941 and 1942 With Radiant Energies 10 Ergs
Bradley E. Schaefer
V2487 Ophiuchi (V2487 Oph) is a recurrent nova with classical nova eruptions in 1900 and 1998, and it is also the most extreme known superflare star. These superflares are roughly-…
Evolutionary Period Changes For 52 Cataclysmic Variables, and the Failure For the Most Fundamental Prediction of the Magnetic Braking Model
Bradley E. Schaefer
The evolution of Cataclysmic Variables (CVs) is driven by period-changes (), for which the long-venerable consensus is the Magnetic Braking Model (MBM). The MBM has its on…
Hydrodynamic simulations of WD-WD mergers and the origin of RCB stars
Sagiv Shiber, Orsola De Marco, Patrick M. Motl +10
We study the properties of double white dwarf (DWD) mergers by performing hydrodynamic simulations using the new and improved adaptive mesh refinement code Octo-Tiger. We follow th…
Light Curves For Ten R Coronae Borealis Stars For Longer Than a Century: Secular Evolution, Dip Statistics, and a General Model for the Shape of Isolated Light Curve Dips
Bradley E. Schaefer
R Coronae Borealis stars (RCBs) are cool supergiants that display non-periodic deep dips in brightness. Recently, a group of `Hot RCB stars` has been discovered to be fast evolving…
The recurrent nova T CrB had prior eruptions observed near December 1787 and October 1217 AD
Bradley E. Schaefer
The famous recurrent nova (RN) T Coronae Borealis (T CrB) has had observed eruptions peaking at a visual magnitude of 2.0 in the years 1866 and 1946, while a third eruption is now…
Orbital Period Changes for Fourteen Novae and the Critical Failures of the Predictions of Standard Theories, the Hibernation Model, and the Magnetic Braking Model
Bradley E. Schaefer
The evolution of novae and Cataclysmic Variables (CVs) is driven by changes in the binary orbital periods. In a direct and critical test for various evolution models and their phys…
The B & V Light Curves for Recurrent Nova T CrB From 1842--2022, the Unique Pre- and Post-Eruption High-States, the Complex Period Changes, and the Upcoming Eruption in 2025.51.3
Bradley E. Schaefer
T CrB is one of the most-famous and brightest novae known, and is a recurrent nova with prior eruptions in 1866 and 1946 that peak at =2.0. I have constructed light curves spann…
The Path from the Chinese and Japanese Observations of Supernova 1181 AD, to a Type Iax Supernova, to the Merger of CO and ONe White Dwarfs
Bradley E. Schaefer
In 1181 AD, Chinese and Japanese observers reported an unmoving bright `Guest Star' in the constellation Chuanshe, visible for 185 days. In 2013, D. Patchick discovered what turned…
The Nova KT Eri Is a Recurrent Nova With a Recurrence Time-Scale of 40-50 Years
Bradley E. Schaefer, Frederick M. Walter, Rebekah Hounsell +1
KT Eridani was a very fast nova in 2009 peaking at V=5.42 mag. We marshal large data sets of photometry to finally work out the nature of KT Eri. From the TESS light curve, as conf…
Comprehensive Catalogue of the Overall Best Distances and Properties of 402 Galactic Novae
Bradley E. Schaefer
I derive the overall best distances for all 402 known galactic novae, and I collect their many properties. The centrepiece is the 74 novae with accurate parallaxes from the new Gai…
A Spectral Classification System for Hydrogen-deficient Carbon Stars
Courtney L. Crawford, Patrick Tisserand, Geoffrey C. Clayton +6
Stellar spectral classification has been highly useful in the study of stars. While there is a currently accepted spectral classification system for carbon stars, the subset of Hyd…
Comprehensive Listing of 156 Reliable Orbital Periods for Novae, Including 49 New Periods
Bradley E. Schaefer
I report on a large-scale search for the orbital periods (P) of most known nova systems, by looking for significant, coherent, and stable optical photometric modulation in two or m…