Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events
Stars orbiting supermassive black holes can generate recurring accretion flares in repeating partial tidal disruption events (TDEs). Here, we develop an efficient formalism for analyzing the time-dependent response of a star to the removal of a fraction (≲10%) of its mass. This model predicts that m...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/add9a5 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849685010886426624 |
|---|---|
| author | Ananya Bandopadhyay Eric R. Coughlin C. J. Nixon |
| author_facet | Ananya Bandopadhyay Eric R. Coughlin C. J. Nixon |
| author_sort | Ananya Bandopadhyay |
| collection | DOAJ |
| description | Stars orbiting supermassive black holes can generate recurring accretion flares in repeating partial tidal disruption events (TDEs). Here, we develop an efficient formalism for analyzing the time-dependent response of a star to the removal of a fraction (≲10%) of its mass. This model predicts that mass loss results in a decrease in the average density of low-mass (≲0.7 M _⊙ ) stars. In contrast, higher-mass stars exhibit an increase in their average density, such that the change is more pronounced for larger mass losses, and stars with masses ∼1.5−2 M _⊙ experience the largest such increase. We predict that the final energy of the star post-mass-loss (i.e., the “surviving core”) is effectively given by the binding energy of the original star interior to the radius from which mass is removed, i.e., the final core energy is agnostic to the process that removes the mass and—as a corollary—tidal heating is comparatively insignificant. We find excellent agreement between our predictions and one-dimensional Eulerian simulations of a star undergoing mass loss, and three-dimensional Lagrangian simulations of partial TDEs. We conclude that (1) partially disrupted stars are not significantly heated via tidal dissipation, (2) evolved and moderately massive (≳1.5 M _⊙ ) stars can most readily survive many repeated stripping events, and (3) progressively dimmer flares—observed in some repeating partial TDE candidates—could be explained by the increase in the density of the star post-mass-loss. |
| format | Article |
| id | doaj-art-e474fa45dd9a4e4784947be1a6a93db5 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-e474fa45dd9a4e4784947be1a6a93db52025-08-20T03:23:18ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198711610.3847/1538-4357/add9a5Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption EventsAnanya Bandopadhyay0https://orcid.org/0000-0002-5116-844XEric R. Coughlin1https://orcid.org/0000-0003-3765-6401C. J. Nixon2https://orcid.org/0000-0002-2137-4146Department of Physics , Syracuse University, Syracuse, NY 13210, USA ; abandopa@syr.edu, ecoughli@syr.eduDepartment of Physics , Syracuse University, Syracuse, NY 13210, USA ; abandopa@syr.edu, ecoughli@syr.eduSchool of Physics and Astronomy , Sir William Henry Bragg Building, Woodhouse Lane, University of Leeds, Leeds LS2 9JT, UKStars orbiting supermassive black holes can generate recurring accretion flares in repeating partial tidal disruption events (TDEs). Here, we develop an efficient formalism for analyzing the time-dependent response of a star to the removal of a fraction (≲10%) of its mass. This model predicts that mass loss results in a decrease in the average density of low-mass (≲0.7 M _⊙ ) stars. In contrast, higher-mass stars exhibit an increase in their average density, such that the change is more pronounced for larger mass losses, and stars with masses ∼1.5−2 M _⊙ experience the largest such increase. We predict that the final energy of the star post-mass-loss (i.e., the “surviving core”) is effectively given by the binding energy of the original star interior to the radius from which mass is removed, i.e., the final core energy is agnostic to the process that removes the mass and—as a corollary—tidal heating is comparatively insignificant. We find excellent agreement between our predictions and one-dimensional Eulerian simulations of a star undergoing mass loss, and three-dimensional Lagrangian simulations of partial TDEs. We conclude that (1) partially disrupted stars are not significantly heated via tidal dissipation, (2) evolved and moderately massive (≳1.5 M _⊙ ) stars can most readily survive many repeated stripping events, and (3) progressively dimmer flares—observed in some repeating partial TDE candidates—could be explained by the increase in the density of the star post-mass-loss.https://doi.org/10.3847/1538-4357/add9a5Black hole physicsHydrodynamicsStellar oscillationsStellar structuresSupermassive black holesTidal disruption |
| spellingShingle | Ananya Bandopadhyay Eric R. Coughlin C. J. Nixon Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events The Astrophysical Journal Black hole physics Hydrodynamics Stellar oscillations Stellar structures Supermassive black holes Tidal disruption |
| title | Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events |
| title_full | Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events |
| title_fullStr | Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events |
| title_full_unstemmed | Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events |
| title_short | Repeated Tidal Interactions Between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events |
| title_sort | repeated tidal interactions between stars and supermassive black holes mass transfer stability and implications for repeating partial tidal disruption events |
| topic | Black hole physics Hydrodynamics Stellar oscillations Stellar structures Supermassive black holes Tidal disruption |
| url | https://doi.org/10.3847/1538-4357/add9a5 |
| work_keys_str_mv | AT ananyabandopadhyay repeatedtidalinteractionsbetweenstarsandsupermassiveblackholesmasstransferstabilityandimplicationsforrepeatingpartialtidaldisruptionevents AT ericrcoughlin repeatedtidalinteractionsbetweenstarsandsupermassiveblackholesmasstransferstabilityandimplicationsforrepeatingpartialtidaldisruptionevents AT cjnixon repeatedtidalinteractionsbetweenstarsandsupermassiveblackholesmasstransferstabilityandimplicationsforrepeatingpartialtidaldisruptionevents |