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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.

Authors

L. Delrez

V. Van Grootel

D.R. Anderson

A. Collier-Cameron

A.P. Doyle

A. Fumel

M. Gillon

E. Jehin

M. Lendl

M. Neveu-VanMalle

F. Pepe

D. Pollacco

D. Queloz

D. Ségransan

A.M.S. Smith

A.H.M.J. Triaud

S. Udry

R.G. West



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.

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

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