1. Главная
  2. Ресурсы
  3. Библиотечный поиск
WASP-80b has adayside within theT-dwarf range A. H. M. J. TriaudM. GillonD. Ehrenreich2015 год

WASP-80b has a dayside within the T-dwarf range
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: WASP-80b is a missing link in the study of exo-atmospheres. It falls between the warm Neptunes and the hot Jupiters and is amenable for characterisation, thanks to its host star's properties. We observed the planet through transit and during occultation with Warm Spitzer. Combining our mid-infrared transits with optical time series, we find that the planet presents a transmission spectrum indistinguishable from a horizontal line. In emission, WASP-80b is the intrinsically faintest planet whose dayside flux has been detected in both the 3.6 and 4.5 $\mu$m Spitzer channels. The depths of the occultations reveal that WASP-80b is as bright and as red as a T4 dwarf, but that its temperature is cooler. If planets go through the equivalent of an L-T transition, our results would imply this happens at cooler temperatures than for brown dwarfs. Placing WASP-80b's dayside into a colour-magnitude diagram, it falls exactly at the junction between a blackbody model and the T-dwarf sequence; we cannot discern which of those two interpretations is the more likely. Flux measurements on other planets with similar equilibrium temperatures are required to establish whether irradiated gas giants, like brown dwarfs, transition between two spectral classes. An eventual detection of methane absorption in transmission would also help lift that degeneracy. We obtained a second series of high-resolution spectra during transit, using HARPS. We reanalyse the Rossiter-McLaughlin effect. The data now favour an aligned orbital solution and a stellar rotation nearly three times slower than stellar line broadening implies. A contribution to stellar line broadening, maybe macroturbulence, is likely to have been underestimated for cool stars, whose rotations have therefore been systematically overestimated. [abridged]
Год издания: 2015
Авторы: A. H. M. J. Triaud, M. Gillon, D. Ehrenreich, E. Herrero, M. Lendl, D. R. Anderson, A. Collier Cameron, L. Delrez, Brice-Olivier Demory, C. Hellier, K. Heng, E. Jehin, P. F. L. Maxted, D. Pollacco, D. Queloz, I. Ribas, B. Smalley, A. M. S. Smith, S. Udry
Издательство: Oxford University Press
Источник: Monthly Notices of the Royal Astronomical Society
Ключевые слова: Stellar, planetary, and galactic studies, Astro and Planetary Science, Astrophysics and Star Formation Studies
Другие ссылки: Monthly Notices of the Royal Astronomical Society (PDF)
Monthly Notices of the Royal Astronomical Society (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
BORIS (University Library Bern) (PDF)
BORIS (University Library Bern) (HTML)
Open Repository and Bibliography (University of Liège) (HTML)
St Andrews Research Repository (St Andrews Research Repository) (PDF)
St Andrews Research Repository (St Andrews Research Repository) (HTML)
reroDoc Digital Library (HTML)
DataCite API (HTML)