A New LISA-Detectable Type Ia Supernova Progenitor in the Southern Sky: SMSS J1138-5139
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| Formato: | Preprint |
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2024
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| author | Kosakowski, Alekzander Dorsch, Matti Brown, Warren R. Kupfer, Thomas Daya, Fatma Ben Kilic, Mukremin |
| author_facet | Kosakowski, Alekzander Dorsch, Matti Brown, Warren R. Kupfer, Thomas Daya, Fatma Ben Kilic, Mukremin |
| contents | We present the discovery and analysis of a nearby eclipsing ultra-compact accreting binary at coordinates 11:38:10.91 $-$51:39:49.15 (SMSS J1138$-$5139), the first well-constrained LISA-detectable Type Ia supernova progenitor. Our time series optical spectroscopy identifies its orbital period through radial velocity monitoring at $P_{\rm orb,RV}=27.69\pm0.03~{\rm min}$; twice the photometric period seen in 2-minute cadence data from TESS Sector 37. We model our optical spectroscopy together with new simultaneous multi-band time series photometry from Gemini to place constraints on the binary parameters. Our light curve modeling finds that SMSS J1138$-$5139 contains an $M_2=0.24~{\rm M_\odot}$ pre-white dwarf donor with a massive $M_1=0.99~{\rm M_\odot}$ white dwarf accretor at orbital inclination $i=88.7~{\rm deg}$. Based on our photometrically derived system parameters, we expect that gravitational wave radiation will drive SMSS J1138$-$5139 to a merger within $τ=5.7\pm0.3~{\rm Myr}$ and result in a Type Ia supernova. Even without a direct merger event, the component masses of SMSS J1138$-$5139 and active hydrogen accretion suggest that eventual helium accretion will likely also trigger a Type Ia supernova explosion through the dynamically-driven double-degenerate double-detonation (D6) channel. We expect LISA to detect the gravitational wave emission from SMSS J1138$-$5139 with signal-to-noise $7-10$ after a 48-month mission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_19391 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A New LISA-Detectable Type Ia Supernova Progenitor in the Southern Sky: SMSS J1138-5139 Kosakowski, Alekzander Dorsch, Matti Brown, Warren R. Kupfer, Thomas Daya, Fatma Ben Kilic, Mukremin Solar and Stellar Astrophysics High Energy Astrophysical Phenomena We present the discovery and analysis of a nearby eclipsing ultra-compact accreting binary at coordinates 11:38:10.91 $-$51:39:49.15 (SMSS J1138$-$5139), the first well-constrained LISA-detectable Type Ia supernova progenitor. Our time series optical spectroscopy identifies its orbital period through radial velocity monitoring at $P_{\rm orb,RV}=27.69\pm0.03~{\rm min}$; twice the photometric period seen in 2-minute cadence data from TESS Sector 37. We model our optical spectroscopy together with new simultaneous multi-band time series photometry from Gemini to place constraints on the binary parameters. Our light curve modeling finds that SMSS J1138$-$5139 contains an $M_2=0.24~{\rm M_\odot}$ pre-white dwarf donor with a massive $M_1=0.99~{\rm M_\odot}$ white dwarf accretor at orbital inclination $i=88.7~{\rm deg}$. Based on our photometrically derived system parameters, we expect that gravitational wave radiation will drive SMSS J1138$-$5139 to a merger within $τ=5.7\pm0.3~{\rm Myr}$ and result in a Type Ia supernova. Even without a direct merger event, the component masses of SMSS J1138$-$5139 and active hydrogen accretion suggest that eventual helium accretion will likely also trigger a Type Ia supernova explosion through the dynamically-driven double-degenerate double-detonation (D6) channel. We expect LISA to detect the gravitational wave emission from SMSS J1138$-$5139 with signal-to-noise $7-10$ after a 48-month mission. |
| title | A New LISA-Detectable Type Ia Supernova Progenitor in the Southern Sky: SMSS J1138-5139 |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2411.19391 |