2020
DOI: 10.3847/2041-8213/abb130
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A Year-long Superoutburst from an Ultracompact White Dwarf Binary Reveals the Importance of Donor Star Irradiation

Abstract: SDSS J080710+485259 is the longest-period outbursting ultracompact white dwarf binary. Its first-ever detected superoutburst started in 2018 November and lasted for a year, the longest detected so far for any short orbital period accreting white dwarf. Here we show the superoutburst duration of SDSS J080710+485259 exceeds the ∼2 month viscous time of its accretion disk by a factor of about 5. Consequently it follows that neither the empirical relation nor the theoretical relation between the orbital period and… Show more

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Cited by 10 publications
(2 citation statements)
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“…The observations of PTF1 J0719+4858 then argues for the need to account for EMT mechanisms in the DIM in AM CVns with P orb shorter than 30 min. This is not surprising as such mechanisms have been shown to exist at longer periods (Rivera Sandoval et al 2020, 2021a where enhanced mass transfer and not disc instabilities are the main cause for the outbursts.…”
Section: Ptf1 J0719+4858: Evidence For Enhanced Mass Transfermentioning
confidence: 90%
“…The observations of PTF1 J0719+4858 then argues for the need to account for EMT mechanisms in the DIM in AM CVns with P orb shorter than 30 min. This is not surprising as such mechanisms have been shown to exist at longer periods (Rivera Sandoval et al 2020, 2021a where enhanced mass transfer and not disc instabilities are the main cause for the outbursts.…”
Section: Ptf1 J0719+4858: Evidence For Enhanced Mass Transfermentioning
confidence: 90%
“…Such outbursts are likely to be qualitatively different in nature than standard outbursts due to the ionization instability, because a minimum amount of mass needs to be involved to trigger the ionization instability. In recent years, a few accreting white dwarfs have shown long, faint outbursts in which the optically thick components of their accretion discs never reached high enough temperatures for the disc to become ionized (Rivera Sandoval, Maccarone & Pichardo Marcano 2020 ;Rivera Sandoval et al 2021 ;Sunny Wong et al 2021 ), and these are likely due to changes in the mass transfer rate from the donor stars, rather than due to disc processes (Rivera Sandoval et al 2021 ). This is likely to happen in X-ray binaries as well, and such long term, low amplitude variability is already well-noted in the optical bands in one black hole X-ray binary (Cantrell et al 2008 ), and in the X-ray band in at least one accreting NS (Cackett et al 2010 ) and one black hole (Bernardini & Cackett 2014 ).…”
Section: F U T U R E P Ro S P E C T Smentioning
confidence: 99%