Hermes, JJ;
Putterman, O;
Hollands, MA;
Wilson, DJ;
Swan, A;
Raddi, R;
Shen, KJ;
(2021)
8.9 hr Rotation in the Partly Burnt Runaway Stellar Remnant LP 40-365 (GD 492).
Astrophysical Journal Letters
, 914
(1)
10.3847/2041-8213/ac00a8.
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Abstract
We report the detection of 8.914 hr variability in both optical and ultraviolet light curves of LP 40−365 (also known as GD 492), the prototype for a class of partly burnt runaway stars that have been ejected from a binary due to a thermonuclear supernova event. We first detected this 1.0% amplitude variation in optical photometry collected by the Transiting Exoplanet Survey Satellite (TESS). Reanalysis of observations from the Hubble Space Telescope at the TESS period and ephemeris reveal a 5.8% variation in the ultraviolet of this 9800 K stellar remnant. We propose that this 8.914 hr photometric variation reveals the current surface rotation rate of LP 40−365, and is caused by some kind of surface inhomogeneity rotating in and out of view, though a lack of observed Zeeman splitting puts an upper limit on the magnetic field of <20 kG. We explore ways in which the present rotation period can constrain progenitor scenarios if angular momentum was mostly conserved, which suggests that the survivor LP 40−365 was not the donor star but was most likely the bound remnant of a mostly disrupted white dwarf that underwent advanced burning from an underluminous (Type Iax) supernova.
| Type: | Article |
|---|---|
| Title: | 8.9 hr Rotation in the Partly Burnt Runaway Stellar Remnant LP 40-365 (GD 492) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/2041-8213/ac00a8 |
| Publisher version: | https://doi.org/10.3847/2041-8213/ac00a8 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10130131 |
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