WASP-169, WASP-171, WASP-175 and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-south

L. D. Nielsen, F. Bouchy, O. D. Turner, D. R. Anderson, K. Barkaoui, Z. Benkhaldoun, A. Burdanov, A. Collier Cameron, L. Delrez, M. Gillon, E. Ducrot, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, F. Pepe, D. Pollacco, F. J. Pozuelos, D. Queloz, D. SégransanB. Smalley, A. H. M. J. Triaud, S. Udry, R. G. West

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We present the discovery of four new giant planets from the Wide Angle Search for Planets-South (WASP-South), three hot Jupiters and one bloated sub-Saturn mass planet: WASP-169b, WASP-171b, WASP-175b, and WASP-182b. Besides the discovery photometry from WASP-South we use radial velocity measurements from CORALIE and HARPS and follow-up photometry from EulerCam, TRAPPIST-North and -South, and SPECULOOS. WASP-169b is a low-density Jupiter (⁠M=0.561±0.061MJup, R=1.304+0.150−0.073RJup⁠) orbiting a V = 12.17 F8 subgiant in a 5.611 d orbit. WASP-171b is a typical hot Jupiter (⁠M=1.084±0.094MJup, R=0.98+0.07−0.04RJup⁠, P = 3.82 d) around a V = 13.05 G0 star. We find a linear drift in the radial velocities of WASP-171 spanning 3.5 yr, indicating the possibility of an additional outer planet or stellar companion. WASP-175b is an inflated hot Jupiter (M = 0.99 ± 0.13 MJup, R = 1.208 ± 0.081 RJup, P = 3.07 d) around a V = 12.04 F7 star, which possibly is part of a binary system with a star 7.9 arcsec away. WASP-182b is a bloated sub-Saturn mass planet (M = 0.148 ± 0.011 MJup, R = 0.850 ± 0.030 RJup) around a metal-rich V = 11.98 G5 star ([Fe/H] = 0.27 ± 0.11). With an orbital period of P = 3.377 d, it sits right in the apex of the sub-Jovian desert, bordering the upper and lower edge of the desert in both the mass–period and radius–period plane. WASP-169b, WASP-175b, and WASP-182b are promising targets for atmospheric characterization through transmission spectroscopy, with expected transmission signals of 121, 150, and 264 ppm, respectively.
Original languageEnglish
Pages (from-to)2478–2487
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date23 Aug 2019
Publication statusPublished - Oct 2019


  • Planets and satellites: detection
  • Planets and satellites: individual: WASP-169b
  • Planets and satellites: individual: WASP-171b
  • Planets and satellites: individual: WASP-175b
  • Planets and satellites: individual: WASP-182b


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