Dissecting the Supersoft Source Phase of the Magnetic Nova V1674 Her (Nova Her 2021)
Abstract
V1674 Her (Nova Her 2021) is the first bright nova supersoft source that has been identified with a magnetic white dwarf progenitor. An 8.357 minute period was found in ZTF data taken between 2018 and 2021 that is most likely caused by the spin period of the WD, strongly indicating an intermediate polar. The presence of strong neon emission lines in spectra from 2021 June 30 also demonstrate that V1674 Her is a member of the class of neon novae. It has become a very bright supersoft X-ray source with a Swift XRT count rate of 10 count/s. A Chandra LETG+HRC-S spectrum should be uncomplicated by accretion and can be phase-folded with the known period. It will provide a powerful test of whether or not nuclear burning is insensitive to the local magnetic field, and reveal velocity signatures of radiatively-driven outflow collimation. V1674 Her is the first bright SSS to be so characterized prior to outburst.
- Publication:
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Chandra Proposal
- Pub Date:
- July 2020
- Bibcode:
- 2020cxo..prop.6042D
- Keywords:
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- Chandra Proposal ID #22308793