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Convection and rotation boosted prescription of magnetic braking: application to the formation of extremely low-mass white dwarfs

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arxiv 2107.03952 v1 pith:6K3GURFZ submitted 2021-07-08 astro-ph.SR

Convection and rotation boosted prescription of magnetic braking: application to the formation of extremely low-mass white dwarfs

L. T. T. Soethe , S. O. Kepler This is my paper
classification astro-ph.SR
keywords periodwhitebinaryinitiallow-massbinariesboostedbraking
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Extremely low-mass white dwarfs (ELM WDs) are the result of binary evolution in which a low-mass donor star is stripped by its companion leaving behind a helium-core white dwarf. We explore the formation of ELM WDs in binary systems considering the Convection And Rotation Boosted magnetic braking treatment. Our evolutionary sequences were calculated using the MESA code, with initial masses of 1.0 and 1.2 Msun (donor), and 1.4 (accretor), compatible with low mass X-ray binaries (LMXB) systems. We obtain ELM models in the range 0.15 to 0.27 Msun from a broad range of initial orbital periods, 1 to 25 d. The bifurcation period, where the initial period is equal to the final period, ranges from 20 to 25 days. In addition to LMXBs, we show that ultra-compact X-ray binaries (UCXB) and wide-orbit binary millisecond pulsars can also be formed. The relation between mass and orbital period obtained is compatible with the observational data from He white dwarf companions to pulsars.

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Cited by 3 Pith papers

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  1. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 accept novelty 6.5

    TESS data give photometric periods for 1362 cataclysmic variables (hundreds new), confirming the 2–3 h gap, a sample median of 3.68 h, and spin periods for 83 intermediate polars.

  2. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 6.0

    TESS photometry yields coherent periods for 1,362 CVs, including roughly 465–565 first determinations, and confirms the 2–3 h period gap with a median period near 3.68 h.

  3. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 5.0

    TESS photometry of 1,362 cataclysmic variables yields 565 new period measurements, confirms the 2–3 h period gap, and finds a median CV photometric period of 3.681 h.