Howarth, ID;
(2016)
A reappraisal of parameters for the putative planet PTFO 8-8695b and its potentially precessing parent star.
Monthly Notices of the Royal Astronomical Society
, 457
(4)
pp. 3769-3774.
10.1093/mnras/stw245.
Preview |
Text
Howarth_stw245.pdf - Published Version Download (10MB) | Preview |
Abstract
Published photometry of fading events in the PTFO8-8695 system is modelled using improved treatments of stellar geometry, surface intensities, and, particularly, gravity darkening, with a view to testing the planetary-transit hypothesis. Variability in the morphology of fading events can be reproduced by adopting convective-envelope gravity darkening, but near-critical stellar rotation is required. This leads to inconsistencies with spectroscopic observations; the model also predicts substantial photometric variability associated with stellar precession, contrary to observations. Furthermore, the empirical ratio of orbital to rotational angular momenta is at odds with physically plausible values. An exoplanet transiting a precessing, gravity-darkened star may not be the correct explanation of periodic fading events in this system.
| Type: | Article |
|---|---|
| Title: | A reappraisal of parameters for the putative planet PTFO 8-8695b and its potentially precessing parent star |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw245 |
| Publisher version: | http://doi.org/10.1093/mnras/stw245 |
| 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/1491789 |
Archive Staff Only
 |
View Item |
