On the tidal interaction of a solar-type star with an orbiting companion: Excitation of g mode oscillation and orbital evolution
We calculate the dynamical tides raised on a non-rotating solar-type star by a close stellar or planetary companion. Dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered. We compute the torque exerted on the star b...
| Príomhchruthaitheoirí: | , , , |
|---|---|
| Formáid: | Journal article |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
Institute of Physics Publishing
1998
|
| _version_ | 1826282585314033664 |
|---|---|
| author | Terquem, C Papaloizou, J Nelson, R Lin, D |
| author_facet | Terquem, C Papaloizou, J Nelson, R Lin, D |
| author_sort | Terquem, C |
| collection | OXFORD |
| description | We calculate the dynamical tides raised on a non-rotating solar-type star by a close stellar or planetary companion. Dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered. We compute the torque exerted on the star by a companion in circular orbit, and determine the potentially observable magnitude of the tidally induced velocity at the stellar photosphere. These calculations are compared with the results obtained by assuming that a very small frequency limit can be taken in order to calculate the tidal response (equilibrium tide). For a standard solar model, the latter is found to give a relatively poor approximation at the periods of interest of several days, even when the system is far from resonance with a normal mode. It is shown that although the companion may go through a succession of resonances as it spirals in under the action of the tides, for a fixed spectrum of normal modes its migration is controlled essentially by the non-resonant interaction. We find that the turbulent viscosity that is required to provide the observed circularization rates of main sequence solar-type binaries is about fifty times larger than that simply estimated from mixing length theory for non-rotating stars. We discuss the means by which this enhanced viscosity might be realized. These calculations are applied to 51 Pegasi. We show that the perturbed velocity induced by the tides at the stellar surface is too small to be observed. |
| first_indexed | 2024-03-07T00:46:05Z |
| format | Journal article |
| id | oxford-uuid:84b3f414-30cf-4e32-af9e-404e7ae6b9fe |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:46:05Z |
| publishDate | 1998 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:84b3f414-30cf-4e32-af9e-404e7ae6b9fe2022-03-26T21:52:48ZOn the tidal interaction of a solar-type star with an orbiting companion: Excitation of g mode oscillation and orbital evolutionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:84b3f414-30cf-4e32-af9e-404e7ae6b9feEnglishSymplectic Elements at OxfordInstitute of Physics Publishing1998Terquem, CPapaloizou, JNelson, RLin, DWe calculate the dynamical tides raised on a non-rotating solar-type star by a close stellar or planetary companion. Dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered. We compute the torque exerted on the star by a companion in circular orbit, and determine the potentially observable magnitude of the tidally induced velocity at the stellar photosphere. These calculations are compared with the results obtained by assuming that a very small frequency limit can be taken in order to calculate the tidal response (equilibrium tide). For a standard solar model, the latter is found to give a relatively poor approximation at the periods of interest of several days, even when the system is far from resonance with a normal mode. It is shown that although the companion may go through a succession of resonances as it spirals in under the action of the tides, for a fixed spectrum of normal modes its migration is controlled essentially by the non-resonant interaction. We find that the turbulent viscosity that is required to provide the observed circularization rates of main sequence solar-type binaries is about fifty times larger than that simply estimated from mixing length theory for non-rotating stars. We discuss the means by which this enhanced viscosity might be realized. These calculations are applied to 51 Pegasi. We show that the perturbed velocity induced by the tides at the stellar surface is too small to be observed. |
| spellingShingle | Terquem, C Papaloizou, J Nelson, R Lin, D On the tidal interaction of a solar-type star with an orbiting companion: Excitation of g mode oscillation and orbital evolution |
| title | On the tidal interaction of a solar-type star with an orbiting
companion: Excitation of g mode oscillation and orbital evolution |
| title_full | On the tidal interaction of a solar-type star with an orbiting
companion: Excitation of g mode oscillation and orbital evolution |
| title_fullStr | On the tidal interaction of a solar-type star with an orbiting
companion: Excitation of g mode oscillation and orbital evolution |
| title_full_unstemmed | On the tidal interaction of a solar-type star with an orbiting
companion: Excitation of g mode oscillation and orbital evolution |
| title_short | On the tidal interaction of a solar-type star with an orbiting
companion: Excitation of g mode oscillation and orbital evolution |
| title_sort | on the tidal interaction of a solar type star with an orbiting companion excitation of g mode oscillation and orbital evolution |
| work_keys_str_mv | AT terquemc onthetidalinteractionofasolartypestarwithanorbitingcompanionexcitationofgmodeoscillationandorbitalevolution AT papaloizouj onthetidalinteractionofasolartypestarwithanorbitingcompanionexcitationofgmodeoscillationandorbitalevolution AT nelsonr onthetidalinteractionofasolartypestarwithanorbitingcompanionexcitationofgmodeoscillationandorbitalevolution AT lind onthetidalinteractionofasolartypestarwithanorbitingcompanionexcitationofgmodeoscillationandorbitalevolution |