Neil Gehrels Swift Observatory studies of supersoft novae

Page, K. L.; Beardmore, A. P.; Osborne, J. P.

doi:10.1016/j.asr.2019.08.003

Cited by 27 publications

(20 citation statements)

References 62 publications

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“…A low ejecta mass and high ejecta velocity can be expected to lead to a rapid fall in the column density to the WD photosphere and thus a rapid emergence of the SSS, as was observed. First seen at 18.9 days after outburst, the SSS is in the fastest quartile to emerge among the Swift novae (Schwarz et al 2011;Page et al 2020).…”

Section: V1674 Her Is a Very Fast Novamentioning

confidence: 99%

The Remarkable Spin-down and Ultra-fast Outflows of the Highly-Pulsed Supersoft Source of Nova Hercules 2021

Drake,

Ness,

Page

et al. 2021

Preprint

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Nova Her 2021 (V1674 Her), which erupted on 2021 June 12, reached naked-eye brightness and has been detected from radio to γ-rays. An extremely fast optical decline of 2 magnitudes in 1.2 days and strong Ne lines imply a high-mass white dwarf. The optical pre-outburst detection of a 501.42 s oscillation suggests a magnetic white dwarf. This is the first time that an oscillation of this magnitude has been detected in a classical nova prior to outburst. We report X-ray outburst observations from Swift and Chandra which uniquely show: (1) a very strong modulation of supersoft X-rays at a different period from reported optical periods; (2) strong pulse profile variations and the possible presence of period variations of the order of 0.1-0.3 s; and (3) rich grating spectra that vary with modulation phase and show P Cygni-type emission lines with two dominant blue-shifted absorption components at ∼ 3000 and 9000 km s −1 indicating expansion velocities up to 11000 km s −1 . X-ray oscillations most likely arise from inhomogeneous photospheric emission related to the magnetic field. Period differences between reported pre-and post-outburst optical observations, if not due to other period drift mechanisms, suggest a large ejected mass for such a fast nova, in the range 2 × 10 −5 -2 × 10 −4 M . A difference between the period found in the Chandra data and a reported contemporaneous post-outburst optical period, as well as the presence of period drifts, could be due to weakly non-rigid photospheric rotation.

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Section: V1674 Her Is a Very Fast Novamentioning

confidence: 99%

The Remarkable Spin-down and Ultra-fast Outflows of the Highly-Pulsed Supersoft Source of Nova Hercules 2021

Drake,

Ness,

Page

et al. 2021

Preprint

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“…A favourably positioned nova would receive multiple SXI pointings a day, producing unique temporal coverage of the sometimes highly variable supersoft source stage seen during some outbursts (e.g. [99]…”

Section: Novae In Outburstmentioning

confidence: 99%

Time domain astronomy with the THESEUS satellite

et al. 2021

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THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray bursts and to study the gravitational waves electromagnetic counterparts and neutrino events. On the other hand, its instruments, which include a wide field of view X-ray (0.3-5 keV) telescope based on lobster-eye focussing optics and a gamma-ray spectrometer with imaging capabilities in the 2-150 keV range, are also ideal for carrying out unprecedented studies in time domain astrophysics. In addition, the presence onboard of a 70 cm near infrared telescope will allow simultaneous multiwavelegth studies. Here we present the THESEUS capabilities for studying the time variability of different classes of sources in parallel to, and without affecting, the gamma-ray bursts hunt.

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“…This change in observing strategy and capability led directly to the discovery of RRNe. Rapid response follow-up facilities, such as the Liverpool Telescope [94] and the Neil Gehrels Swift Observatory [95,96], have permitted the study and confirmation of those RRN candidates 4 .…”

Section: Rapid Recurrent Novaementioning

confidence: 99%

Accrete, Accrete, Accrete… Bang! (and repeat): The remarkable Recurrent Novae

Darnley¹

2021

Proceedings of the Golden Age of Cataclysmic Variables and Related Objects v — PoS(GOLDEN2019)

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All novae recur, but only a handful have been observed in eruption more than once. These systems, the recurrent novae (RNe), are among the most extreme examples of novae. RNe have long been thought of as potential type Ia supernova progenitors, and their claim to this 'accolade' has recently been strengthened. In this short review RNe will be presented within the framework of the maximum magnitude-rate of decline (MMRD) phase-space. Recent work integrating Heflashes into nova models, and the subsequent growth of the white dwarf, will be explored. This review also presents an overview of the Galactic and extragalactic populations of RNe, including the newly identified 'rapid recurrent nova' subset-those with recurrence periods of ten years, or less. The most exciting nova system yet discovered-M31N 2008-12a, with its annual eruptions and vast nova super-remnant, is introduced. Throughout, open questions regarding RNe, and some of the expected challenges and opportunities that the near future will bring are addressed.

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Neil Gehrels Swift Observatory studies of supersoft novae

Cited by 27 publications

References 62 publications

The Remarkable Spin-down and Ultra-fast Outflows of the Highly-Pulsed Supersoft Source of Nova Hercules 2021

The Remarkable Spin-down and Ultra-fast Outflows of the Highly-Pulsed Supersoft Source of Nova Hercules 2021

Time domain astronomy with the THESEUS satellite

Accrete, Accrete, Accrete… Bang! (and repeat): The remarkable Recurrent Novae

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