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The highly inflated giant planet WASP-174b

Mancini, L.; Sarkis, P.; Henning, Th.; Bakos, G.A.; Bayliss, D.; Bento, J.; Bhatti, W.; Brahm, R.; Csubry, Z.; Espinoza, N.; Hartman, J.; Jordan, A.; Penev, K.; Rabus, M.; Suc, V.; de Val-Borro, M.; Zhou, G.; Chen, G.; Damasso, M.; Southworth, J.; Tan, T.G.

The highly inflated giant planet WASP-174b Thumbnail


Authors

L. Mancini

P. Sarkis

Th. Henning

G.A. Bakos

D. Bayliss

J. Bento

W. Bhatti

R. Brahm

Z. Csubry

N. Espinoza

J. Hartman

A. Jordan

K. Penev

M. Rabus

V. Suc

M. de Val-Borro

G. Zhou

G. Chen

M. Damasso

T.G. Tan



Abstract

The transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star (V = 11.8 mag) and a giant planet, WASP-174b (orbital period P-orb = 4.23 days). However only an upper limit was placed on the planet mass (<1.3 M-Jup), and a highly uncertain planetary
radius (0.7-1.7 R-Jup) was determined.Aims. We aim to better characterise both the star and the planet and precisely measure their orbital and physical parameters. Methods. In order to constrain the mass of the planet, we obtained new measurements of the radial velocity of the star and joined them with those from the discovery paper. Photometric data from the HATSouth survey and new multi-band, high-quality (precision reached up to 0.37 mmag) photometric follow-up observations of transit events were acquired and analysed for getting accurate photometric parameters. We fit the model to all the observations, including data from the TESS space telescope, in two different modes: incorporating the stellar isochrones into the fit, and using an empirical method to get the stellar parameters. The two modes resulted to be consistent with each other to within 2<sigma>.Results. We confirm the grazing nature of the WASP-174b transits with a confidence level greater than 5 sigma, which is also corroborated by simultaneously observing the transit through four optical bands and noting how the transit depth changes due to the limb-darkening effect. We estimate that approximate to 76% of the disk of the planet actually eclipses the parent star at mid-transit of its transit events. We find that WASP-174b is a highly-inflated hot giant planet with a mass of M-p = 0.330 +/- 0.091 MJup and a radius of R-p = 1.435 +/- 0.050 R-Jup, and is therefore a good target for transmission-spectroscopy observations. With a density of rho (p) = 0.135 +/-0.042 g cm(-3), it is amongst the lowest-density planets ever discovered with precisely measured mass and radius.

Journal Article Type Article
Acceptance Date Jan 1, 2020
Online Publication Date Jan 3, 2020
Publication Date 2020-01
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 633
Article Number A30
DOI https://doi.org/10.1051/0004-6361/201936532
Keywords Giant Planet, WASP-174b
Publisher URL https://www.aanda.org/articles/aa/abs/2020/01/aa36532-19/aa36532-19.html