An SS433 flare caught by TESS. Fast rise times and evidence for a 13 hours quasi-period
Fuente:
arXiv
Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910981777522688 |
|---|---|
| author | Waisberg, Idel |
| author_facet | Waisberg, Idel |
| contents | SS433 is an exotic Galactic microquasar in which there is a supercritical inflow of matter into a compact object of likely black hole nature. Here we report on an SS433 flare that occurred during a TESS observation of Sector 54 in June of 2022. The flare lasted for about 10 days and culminated in a flux increase by a factor of three relative to quiescence. The unprecedented continuous photometric coverage of the flare afforded by TESS shows that the flux can rise and fall by up to a factor of two within 4 to 7 hours. Furthermore, there is evidence that the flare peaks occur with a quasi-period $P_{\mathrm{QPO}} = 13.3$ hours. The flare can be most naturally explained by accretion rate ($\dot{M}$) variations due to oscillations in the donor star mass loss rate. We estimate $\dot{M}$ variations up to a factor of two with an increase in the photospheric radius of the accretion disk by about the same factor, implying that a transient ``common envelope'' enshrouds the binary system during the flares. If the flares are due to radial pulsations in the donor star envelope then their quasi-period $P_{\mathrm{QPO}}$ could imply a mean density $\left < ρ\right > \sim 18 \text{ kg} \text{ m}^{-3}$ for the donor star, compared to $\left < ρ_{\mathrm{RL}} \right > = 0.7-1 \text{ kg} \text{ m}^{-3}$ for a synchronized Roche-lobe filling donor star. Another SS433 lightcurve from a Sector 80 TESS observation in 2024 hints that there may be an outflow from behind the donor star. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02753 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An SS433 flare caught by TESS. Fast rise times and evidence for a 13 hours quasi-period Waisberg, Idel Solar and Stellar Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena SS433 is an exotic Galactic microquasar in which there is a supercritical inflow of matter into a compact object of likely black hole nature. Here we report on an SS433 flare that occurred during a TESS observation of Sector 54 in June of 2022. The flare lasted for about 10 days and culminated in a flux increase by a factor of three relative to quiescence. The unprecedented continuous photometric coverage of the flare afforded by TESS shows that the flux can rise and fall by up to a factor of two within 4 to 7 hours. Furthermore, there is evidence that the flare peaks occur with a quasi-period $P_{\mathrm{QPO}} = 13.3$ hours. The flare can be most naturally explained by accretion rate ($\dot{M}$) variations due to oscillations in the donor star mass loss rate. We estimate $\dot{M}$ variations up to a factor of two with an increase in the photospheric radius of the accretion disk by about the same factor, implying that a transient ``common envelope'' enshrouds the binary system during the flares. If the flares are due to radial pulsations in the donor star envelope then their quasi-period $P_{\mathrm{QPO}}$ could imply a mean density $\left < ρ\right > \sim 18 \text{ kg} \text{ m}^{-3}$ for the donor star, compared to $\left < ρ_{\mathrm{RL}} \right > = 0.7-1 \text{ kg} \text{ m}^{-3}$ for a synchronized Roche-lobe filling donor star. Another SS433 lightcurve from a Sector 80 TESS observation in 2024 hints that there may be an outflow from behind the donor star. |
| title | An SS433 flare caught by TESS. Fast rise times and evidence for a 13 hours quasi-period |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.02753 |