Rosa Wallace Everson
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View article: Black Hole Survival Guide: Searching for Stars in the Galactic Center that Endure Partial Tidal Disruption
Black Hole Survival Guide: Searching for Stars in the Galactic Center that Endure Partial Tidal Disruption Open
Once per ≈10 4 –10 5 yr, an unlucky star may experience a close encounter with a supermassive black hole (SMBH), partially or fully tearing apart the star in an exceedingly brief, bright interaction called a tidal disruption event (TDE). R…
View article: The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics
The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics Open
We propose a new predictive theory for the analysis of common envelope (CE) events that incorporates the effects of relevant hydrodynamical processes into a simple analytical framework. We introduce the ejection and dynamical parameters ξ …
View article: The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics
The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics Open
We propose a new predictive theory for the analysis of common envelope (CE) events that incorporates the effects of relevant hydrodynamical processes into a simple analytical framework. We introduce the ejection and dynamical parameters ξ …
View article: Population synthesis of Thorne-Żytkow objects
Population synthesis of Thorne-Żytkow objects Open
Context. Common envelope evolution of a massive star and a neutron star companion has two possible outcomes: the formation of a short-period binary (a potential gravitational wave source progenitor) or the merger of the massive star with t…
View article: Rethinking Thorne–Żytkow Object Formation: The Fate of X-Ray Binary LMC X-4 and Implications for Ultra-long Gamma-Ray Bursts
Rethinking Thorne–Żytkow Object Formation: The Fate of X-Ray Binary LMC X-4 and Implications for Ultra-long Gamma-Ray Bursts Open
We present a start-to-end simulation aimed at studying the long-term fate of high-mass X-ray binaries and whether a Thorne–Żytkow object (TŻO) might ultimately be assembled. We analyze results from a 3D hydrodynamical simulation that model…
View article: The Evolution of Binaries Embedded Within Common Envelopes
The Evolution of Binaries Embedded Within Common Envelopes Open
Triple stellar systems allow us to study stellar processes that cannot be attained in binary stars. The evolutionary phases in which the stellar members undergo mass exchanges can alter the hierarchical layout of these systems. Yet, the la…
View article: Codes and MESA files used in the publication "The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics"
Codes and MESA files used in the publication "The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics" Open
This repository contains MESA files and additional data for the paper “The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics” by R.W. Everson, M. MacLeod, and E. Ramirez-Ruiz (2024). arXiv:2410.07036 For s…
View article: Rethinking Thorne–Żytkow Object Formation: Assembly via Common Envelope in Field Binaries
Rethinking Thorne–Żytkow Object Formation: Assembly via Common Envelope in Field Binaries Open
Thorne–Żytkow objects (TŻOs), hypothetical merger products in which a neutron star is embedded in a stellar core, are traditionally considered steady-state configurations. Their assembly, especially through dynamical channels, is not well …
View article: Population synthesis of Thorne-Żytkow objects: Rejuvenated donors and unexplored progenitors in the common envelope formation channel
Population synthesis of Thorne-Żytkow objects: Rejuvenated donors and unexplored progenitors in the common envelope formation channel Open
Context. Common envelope evolution of a massive star and a neutron star companion has two possible outcomes: formation of a short-period binary (a potential gravitational wave source progenitor) or a merger of the massive star with the neu…
View article: The Evolution of Binaries Embedded Within Common Envelopes
The Evolution of Binaries Embedded Within Common Envelopes Open
Triple stellar systems allow us to study stellar processes that cannot be attained in binary stars. The evolutionary phases in which the stellar members undergo mass exchanges can alter the hierarchical layout of these systems. Yet, the la…
View article: Rethinking Thorne-Żytkow Object Formation: The Fate of X-ray Binary LMC X-4 and Implications for Ultra-long Gamma-ray Bursts
Rethinking Thorne-Żytkow Object Formation: The Fate of X-ray Binary LMC X-4 and Implications for Ultra-long Gamma-ray Bursts Open
We present a start-to-end simulation aimed at studying the long-term fate of high-mass X-ray binaries and whether a Thorne-Żytkow object (TŻO) might ultimately be assembled. We analyze results from a 3D hydrodynamical simulation that model…
View article: Rethinking Thorne-Żytkow Object Formation: Assembly via Common Envelope in Field Binaries
Rethinking Thorne-Żytkow Object Formation: Assembly via Common Envelope in Field Binaries Open
Thorne-Żytkow objects (TŻOs), hypothetical merger products in which a neutron star is embedded in a stellar core, are traditionally considered steady-state configurations. Their assembly, especially through dynamical channels, is not well-…
View article: Hydrodynamics and Survivability during Post-main-sequence Planetary Engulfment
Hydrodynamics and Survivability during Post-main-sequence Planetary Engulfment Open
The engulfment of substellar bodies (SBs), such as brown dwarfs and planets, by giant stars is a possible explanation for rapidly rotating giants, lithium-rich giants, and the presence of SBs in close orbits around subdwarfs and white dwar…
View article: A revised energy formalism for common-envelope evolution: repercussions for planetary engulfment and the formation of neutron star binaries
A revised energy formalism for common-envelope evolution: repercussions for planetary engulfment and the formation of neutron star binaries Open
Common-envelope evolution is a stage in binary system evolution in which a giant star engulfs a companion. The standard energy formalism is an analytical framework to estimate the amount of energy transferred from the companion's shrinking…
View article: Reproducibility data for Yarza et al. 2022
Reproducibility data for Yarza et al. 2022 Open
Data to reproduce the results of Yarza et al. 2022 (submitted to ApJ). For the main reproducibility repository, see https://gitlab.com/ryarza/planetary-engulfment-hydro\n\nAfter downloading all the files, run unpack.py to extract them. The…
View article: Reproducibility data for Yarza et al. 2022
Reproducibility data for Yarza et al. 2022 Open
Data to reproduce the results of Yarza et al. 2022 (submitted to ApJ). For the main reproducibility repository, see https://gitlab.com/ryarza/planetary-engulfment-hydro After downloading all the files, run unpack.py to extract them. The sc…
View article: The Evolution of Binaries under the Influence of Radiation-Driven Winds from a Stellar Companion
The Evolution of Binaries under the Influence of Radiation-Driven Winds from a Stellar Companion Open
Interacting binaries are of general interest as laboratories for investigating the physics of accretion, which gives rise to the bulk of high-energy radiation in the Galaxy. They allow us to probe stellar evolution processes that cannot be…
View article: Successful Common Envelope Ejection and Binary Neutron Star Formation in\n 3D Hydrodynamics
Successful Common Envelope Ejection and Binary Neutron Star Formation in\n 3D Hydrodynamics Open
A binary neutron star merger has been observed in a multi-messenger detection\nof gravitational wave (GW) and electromagnetic (EM) radiation. Binary neutron\nstars that merge within a Hubble time, as well as many other compact binaries,\na…
View article: Successful Common Envelope Ejection and Binary Neutron Star Formation in 3D Hydrodynamics
Successful Common Envelope Ejection and Binary Neutron Star Formation in 3D Hydrodynamics Open
A binary neutron star merger has been observed in a multi-messenger detection of gravitational wave (GW) and electromagnetic (EM) radiation. Binary neutron stars that merge within a Hubble time, as well as many other compact binaries, are …
View article: Common Envelope Wind Tunnel: Range of Applicability and Self-similarity in Realistic Stellar Envelopes
Common Envelope Wind Tunnel: Range of Applicability and Self-similarity in Realistic Stellar Envelopes Open
Common envelope evolution, the key orbital tightening phase of the traditional formation channel for close binaries, is a multistage process that presents many challenges to the establishment of a fully descriptive, predictive theoretical …
View article: Common Envelope Wind Tunnel: The Effects of Binary Mass Ratio and Implications for the Accretion-driven Growth of LIGO Binary Black Holes
Common Envelope Wind Tunnel: The Effects of Binary Mass Ratio and Implications for the Accretion-driven Growth of LIGO Binary Black Holes Open
We present three-dimensional local hydrodynamic simulations of flows around objects embedded within stellar envelopes using a “wind tunnel” formalism. Our simulations model the common envelope dynamical inspiral phase in binary star system…
View article: An Observationally Constrained 3D Potential-field Source-surface Model for the Evolution of Longitude-dependent Coronal Structures
An Observationally Constrained 3D Potential-field Source-surface Model for the Evolution of Longitude-dependent Coronal Structures Open
The improvement of techniques for realistically modeling the solar magnetic field has been a priority in solar physics for decades. The challenge of creating synoptic maps of the photosphere that reliably reflect conditions at all location…