Transiting planets from WASP-South, Euler, and TRAPPIST WASP-68 b, WASP-73 b, and WASP-88 b, three hot Jupiters transiting evolved solar-type stars

Delrez, L.; Van Grootel, V.; Anderson, D.R.; Collier-Cameron, A.; Doyle, A.P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Neveu-VanMalle, M.; Maxted, P.F.L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A.M.S.; Southworth, J.; Triaud, A.H.M.J.; Udry, S.; West, R.G.

Abstract

Using the WASP transit survey, we report the discovery of three new hot Jupiters, WASP-68 b, WASP-73 b and WASP-88 b. The planet WASP-68 bhas a mass of 0.95 ± 0.03 MJup, a radius of 1.24-0.06+0.10 RJup, and orbits a V = 10.7 G0-type star (1.24 ± 0.03 M? 1.69-0.06+0.11 R?, Teff = 5911 ± 60 K) with a period of 5.084298 ± 0.000015 days. Its size is typical of hot Jupiters with similar masses. The planet WASP-73 bis significantly more massive (1.88-0.06+0.07 MJup) and slightly larger (1.16-0.08+0.12 RJup) than Jupiter. It orbits a V = 10.5 F9-type star (1.34-0.04+0.05 M?, 2.07-0.08+0.19 R?, Teff = 6036 ± 120 K) every 4.08722 ± 0.00022 days. Despite its high irradiation (~2.3 × 109 erg?s-1?cm-2), WASP-73 b has a high mean density (1.20-0.30+0.26 ?Jup) that suggests an enrichment of the planet in heavy elements. The planet WASP-88 bis a 0.56 ± 0.08 MJuphot Jupiter orbiting a V = 11.4 F6-type star (1.45 ± 0.05 M?, 2.08-0.06+0.12 R?, Teff = 6431 ± 130 K) with a period of 4.954000 ± 0.000019 days. With a radius of 1.70-0.07+0.13 RJup, it joins the handful of planets with super-inflated radii. The ranges of ages we determine through stellar evolution modeling are 4.5–7.0 Gyr for WASP-68, 2.8-5.7 Gyr for WASP-73 and 1.8–4.3 Gyr for WASP-88. The star WASP-73 appears to be significantly evolved, close to or already in the subgiant phase. The stars WASP-68 and WASP-88 are less evolved, although in an advanced stage of core H-burning.

Citation

Delrez, L., Van Grootel, V., Anderson, D., Collier-Cameron, A., Doyle, A., Fumel, A., …West, R. (2014). Transiting planets from WASP-South, Euler, and TRAPPIST WASP-68 b, WASP-73 b, and WASP-88 b, three hot Jupiters transiting evolved solar-type stars. Astronomy & Astrophysics, 563, Article A143. https://doi.org/10.1051/0004-6361/201323204

• Journal Article Type: Article
• Acceptance Date: Jan 18, 2014
• Publication Date: Mar 25, 2014
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 563
• Article Number: A143
• DOI: https://doi.org/10.1051/0004-6361/201323204
• Keywords: planetary systems; photometric; radial velocities; spectroscopic
• Publisher URL: https://doi.org/10.1051/0004-6361/201323204