Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae
Accreting white dwarfs (WDs) in cataclysmic variables (CVs) show short-period (tens of minutes) brightness variations that are consistent with nonradial oscillations similar to gravity ( g ) modes observed in isolated WDs. The dwarf nova GW Librae was the first CV in which nonradial oscillations wer...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acd1df |
| _version_ | 1827829441315733504 |
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| author | Praphull Kumar Dean M. Townsley |
| author_facet | Praphull Kumar Dean M. Townsley |
| author_sort | Praphull Kumar |
| collection | DOAJ |
| description | Accreting white dwarfs (WDs) in cataclysmic variables (CVs) show short-period (tens of minutes) brightness variations that are consistent with nonradial oscillations similar to gravity ( g ) modes observed in isolated WDs. The dwarf nova GW Librae was the first CV in which nonradial oscillations were observed and continues to be the best-studied accreting WD displaying these pulsations. Unlike isolated WDs, accreting WDs rotate rapidly, with spin periods comparable to or shorter than typical low-order oscillation periods. Accreting WDs also have a different relationship between their interior and surface temperatures. The surface temperature of an accreting WD varies on a months-to-year timescale between dwarf nova accretion events, allowing study of how this temperature change affects g -mode behavior. Here we show results from adiabatic seismological calculations for accreting WDs, focusing on low-order ( ℓ = 1) modes. We demonstrate how g -modes vary in response to temperature changes in the subsurface layers due to a dwarf nova accretion event. These calculations include rotation nonperturbatively, required by the high spin rate. We discuss the thermal history of these accreting WDs and compare the seismological properties with and without rotation. Comparison of g -mode frequencies to observed objects may allow inference of features of the structure of the WD such as mass, surface abundance, accretion history, and more. The variation of mode frequencies during cooling after an outburst provides a novel method of identifying modes. |
| first_indexed | 2024-03-12T04:04:23Z |
| format | Article |
| id | doaj.art-34db7bfb7d31483cb84c3da4d9f5e6da |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:04:23Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-34db7bfb7d31483cb84c3da4d9f5e6da2023-09-03T11:24:15ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01951212210.3847/1538-4357/acd1dfGravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf NovaePraphull Kumar0https://orcid.org/0000-0002-8791-3704Dean M. Townsley1https://orcid.org/0000-0002-9538-5948The University of Alabama , Tuscaloosa, AL, USA ; pkumar5@crimson.ua.eduThe University of Alabama , Tuscaloosa, AL, USA ; pkumar5@crimson.ua.eduAccreting white dwarfs (WDs) in cataclysmic variables (CVs) show short-period (tens of minutes) brightness variations that are consistent with nonradial oscillations similar to gravity ( g ) modes observed in isolated WDs. The dwarf nova GW Librae was the first CV in which nonradial oscillations were observed and continues to be the best-studied accreting WD displaying these pulsations. Unlike isolated WDs, accreting WDs rotate rapidly, with spin periods comparable to or shorter than typical low-order oscillation periods. Accreting WDs also have a different relationship between their interior and surface temperatures. The surface temperature of an accreting WD varies on a months-to-year timescale between dwarf nova accretion events, allowing study of how this temperature change affects g -mode behavior. Here we show results from adiabatic seismological calculations for accreting WDs, focusing on low-order ( ℓ = 1) modes. We demonstrate how g -modes vary in response to temperature changes in the subsurface layers due to a dwarf nova accretion event. These calculations include rotation nonperturbatively, required by the high spin rate. We discuss the thermal history of these accreting WDs and compare the seismological properties with and without rotation. Comparison of g -mode frequencies to observed objects may allow inference of features of the structure of the WD such as mass, surface abundance, accretion history, and more. The variation of mode frequencies during cooling after an outburst provides a novel method of identifying modes.https://doi.org/10.3847/1538-4357/acd1dfWhite dwarf starsCataclysmic variable starsAsteroseismologyStellar oscillationsClassical novae |
| spellingShingle | Praphull Kumar Dean M. Townsley Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae The Astrophysical Journal White dwarf stars Cataclysmic variable stars Asteroseismology Stellar oscillations Classical novae |
| title | Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae |
| title_full | Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae |
| title_fullStr | Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae |
| title_full_unstemmed | Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae |
| title_short | Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae |
| title_sort | gravity modes on rapidly rotating accreting white dwarfs and their variation after dwarf novae |
| topic | White dwarf stars Cataclysmic variable stars Asteroseismology Stellar oscillations Classical novae |
| url | https://doi.org/10.3847/1538-4357/acd1df |
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