The Open UniversitySkip to content

WASP-86b and WASP-102b: super-dense versus bloated planets

Faedi, F.; Gómez Maqueo Chew, Y.; Pollacco, D.; Brown, D. J. A.; Hébrard, G.; Smalley, B.; Lam, K. W. F.; Veras, D.; Anderson, D.; Doyle, A. P.; Gillon, M.; Goad, M. R.; Lendl, M.; Mancini, L.; McCormac, J.; Plauchu-Frayn, I.; Prieto-Arranz, J.; Scholz, A.; Street, R.; Triaud, A. H. M.; West, R.; Wheatley, P. J.; Armstrong, D. J.; Barros, S. C. C.; Boisse, I.; Bouchy, F.; Boumis, P.; Collier Cameron, A.; Haswell, C. A.; Hay, K. L.; Hellier, C.; Kolb, U.; Maxted, P. F. L.; Norton, A. J.; Osborn, H. P.; Palle, E.; Pepe, F.; Queloz, D.; Ségransan, D.; Udry, S. and Wilson, P. A. (2016). WASP-86b and WASP-102b: super-dense versus bloated planets. ArXiv e-prints (In Press).

Full text available as:
PDF (Accepted Manuscript) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview
Google Scholar: Look up in Google Scholar


We report the discovery of two transiting planetary systems: a super dense, sub-Jupiter mass planet WASP-86b (Mpl = 0.82 ± 0.06 MJ; Rpl = 0.63 ± 0.01 RJ), and a bloated, Saturn-like planet WASP-102b (Mpl = 0.62 ± 0.04 MJ; Rpl = 1.27 ± 0.03 RJ). They orbit their host star every ∼5.03, and ∼2.71 days, respectively. The planet hosting WASP-86 is a F7 star (Teff = 6330±110 K, [Fe/H] = +0.23 ± 0.14 dex, and age ∼0.8–1 Gyr); WASP-102 is a G0 star (Teff = 5940±140 K, [Fe/H] = −0.09± 0.19 dex, and age ∼1 Gyr). These two systems highlight the diversity of planetary radii over similar masses for giant planets with masses between Saturn and Jupiter. WASP-102b shows a larger than model-predicted radius, indicating that the planet is receiving a strong incident flux which contributes to the inflation of its radius. On the other hand, with a density of ρpl = 3.24± 0.3 ρJ, WASP-86b is the densest gas giant planet among planets with masses in the range 0.05 < Mpl < 2.0 MJ. With a stellar mass of 1.34 M and [Fe/H]= +0.23 dex, WASP-86 could host additional massive and dense planets given that its protoplanetary disc is expected to also have been enriched with heavy elements. In order to match WASP-86b’s density, an extrapolation of theoretical models predicts a planet composition of more than 80% in heavy elements (whether confined in a core or mixed in the envelope). This fraction corresponds to a core mass of approximately 210M for WASP-86b’s mass of Mpl∼260 M. Only planets with masses larger than about 2 MJ have larger densities than that of WASP-86b, making it exceptional in its mass range.

Item Type: Journal Item
Keywords: Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Related URLs:
Item ID: 51662
Depositing User: John Barnes
Date Deposited: 10 Jan 2018 11:09
Last Modified: 11 May 2019 21:21
Share this page:

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU