512 citations · 1.9k across the 37 of their papers we have counts for
38 papers
Debye cooling of ultramassive white dwarfs
David Barba-González, Sivan Ginzburg
Recent observations of cold and massive white dwarfs are beginning to probe Debye cooling: an accelerated cooling phase driven by the vanishing heat capacity of the crysta…
Sinking and spreading of metal pollution in magnetic white dwarfs
Elad Shiftan, Sivan Ginzburg
Observations of magnetic polluted white dwarfs indicate that most of them have higher concentrations of metals near the poles compared to lower latitudes. Maintaining such abundanc…
Eccentricities of millisecond pulsars with intermediate-mass progenitors
Hagai Bareli, Sivan Ginzburg
One channel to form millisecond pulsars with CO white dwarf companions is through the stable Roche-lobe overflow of intermediate-mass ($3\,{\rm M}_\odot\lesssim M\lesssim 5\,{\rm M…
Double-faced white dwarfs and the magnetic inhibition of convection
Sivan Ginzburg
About one in five white dwarfs undergoes spectral evolution from a helium atmosphere to hydrogen and then back to helium. These short-lived hydrogen envelopes - the result of resid…
Seismology and diffusion of ultramassive white dwarf magnetic fields
Daniel Blatman, Nicholas Z. Rui, Sivan Ginzburg +1
Ultramassive white dwarfs (UMWDs; defined by masses ) are prime targets for seismology, because they pass through the ZZ Ceti instability strip at the s…
Magnetic dynamos powered by white dwarf superficial convection
Rom Yaakovyan, Sivan Ginzburg, Jim Fuller +1
When the effective temperature of a cooling white dwarf drops below the ionization limit, it develops a surface convection zone that may generate a magnetic field …
Younger age for the oldest magnetic white dwarfs
Sivan Ginzburg
Sufficiently old white dwarfs cool down through a convective envelope that directly couples their degenerate cores to the surface. Magnetic fields may inhibit this convection by st…
Magnetic field breakout in ultramassive crystallizing white dwarfs
Daniel Blatman, Sivan Ginzburg
Ultramassive white dwarfs with masses probe extreme physics near the Chandrasekhar limit. Despite the rapid increase in observations, it is still uncl…
White dwarf eccentricity fluctuation and dissipation by AGB convection
Yair Cohen, Sivan Ginzburg, Maya Levy +2
Millisecond pulsars with white dwarf companions have typical eccentricities . The eccentricities of helium white dwarfs are explained well by applying the fl…
Magnetic braking below the cataclysmic variable period gap and the observed dearth of period bouncers
Arnab Sarkar, Antonio C. Rodriguez, Sivan Ginzburg +2
Period bouncers are cataclysmic variables (CVs) that have evolved past their orbital period minimum. The strong disagreement between theory and observations of the relative fractio…
Magnetic field breakout from white dwarf crystallization dynamos
Daniel Blatman, Sivan Ginzburg
A convective dynamo operating during the crystallization of white dwarfs is one of the promising channels to produce their observed strong magnetic fields. Although the magnitude o…
Convective dynamos of black widow companions
Jordan Conrad-Burton, Alon Shabi, Sivan Ginzburg
Black widows and redbacks are binary millisecond pulsars with close low-mass companions that are irradiated and gradually ablated by the pulsar's high-energy luminosity $L_{\rm irr…
AU Microscopii in the FUV: Observations in Quiescence, During Flares, and Implications for AU Mic b and c
Adina D. Feinstein, Kevin France, Allison Youngblood +13
High energy X-ray and ultraviolet (UV) radiation from young stars impacts planetary atmospheric chemistry and mass loss. The active Myr M dwarf AU Mic hosts two exoplanet…
Slow convection and fast rotation in crystallization-driven white dwarf dynamos
Sivan Ginzburg, Jim Fuller, Adela Kawka +1
It has been recently suggested that white dwarfs generate magnetic fields in a process analogous to the Earth. The crystallization of the core creates a compositional inversion tha…
Eccentric millisecond pulsars by resonant convection
Sivan Ginzburg, Eugene Chiang
Eccentric millisecond pulsars (eMSPs) with white dwarf companions exhibit orbital eccentricities orders of magnitude larger than predicted by turbulent convection in the white dwar…
Novae heat their food: mass transfer by irradiation
Sivan Ginzburg, Eliot Quataert
A nova eruption irradiates and heats the donor star in a cataclysmic variable to high temperatures , causing its outer layers to expand and overflow the Roche lobe. We…
Constraining the Nature of the PDS 70 Protoplanets with VLTI/GRAVITY
J. J. Wang, A. Vigan, S. Lacour +101
We present K-band interferometric observations of the PDS 70 protoplanets along with their host star using VLTI/GRAVITY. We obtained K-band spectra and 100 as precision astromet…
As the Worlds Turn: Constraining Spin Evolution in the Planetary-Mass Regime
Marta L. Bryan, Sivan Ginzburg, Eugene Chiang +4
To understand how planetary spin evolves and traces planet formation processes, we measure rotational line broadening in eight planetary-mass objects (PMOs) of various ages (1--800…
Black widow formation by pulsar irradiation and sustained magnetic braking
Sivan Ginzburg, Eliot Quataert
Black widows are millisecond pulsars with low-mass companions, a few per cent the mass of the sun, on orbits of several hours. These companions are presumably the remnants of main…
Heavy-metal Jupiters by major mergers: metallicity vs. mass for giant planets
Sivan Ginzburg, Eugene Chiang
Some Jupiter-mass exoplanets contain of metals, well above the typically needed in a solid core to trigger giant planet formation by ru…
Keck/NIRC2 '-Band Imaging of Jovian-Mass Accreting Protoplanets around PDS 70
Jason J. Wang, Sivan Ginzburg, Bin Ren +42
We present '-band imaging of the PDS 70 planetary system with Keck/NIRC2 using the new infrared pyramid wavefront sensor. We detected both PDS 70 b and c in our images, as well…
How Consumption and Repulsion Set Planetary Gap Depths and the Final Masses of Gas Giants
Mickey Rosenthal, Eugene Chiang, Sivan Ginzburg +1
Planets open gaps in discs. Gap opening is typically modeled by considering the planetary Lindblad torque which repels disc gas away from the planet's orbit. But gaps also clear be…
Re-inflation of warm and hot Jupiters
Thaddeus D. Komacek, Daniel P. Thorngren, Eric D. Lopez +1
Understanding the anomalous radii of many transiting hot gas giant planets is a fundamental problem of planetary science. Recent detections of re-inflated warm Jupiters orbiting po…
Black widow evolution: magnetic braking by an ablated wind
Sivan Ginzburg, Eliot Quataert
Black widows are close binary systems in which a millisecond pulsar is orbited by a companion a few per cent the mass of the sun. It has been suggested that the pulsar's rotational…