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Three newly discovered sub-Jupiter-mass planets: WASP-69b and WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary

Anderson, D.R.; Collier Cameron, A.; Delrez, L.; Doyle, A.P.; Faedi, F.; Fumel, A.; Gillon, M.; Gómez Maqueo Chew, Y.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P.F.L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Skillen, I.; Smalley, B.; Smith, A.M.S.; Taylor, J.; Triaud, A.H.M.J.; Turner, O.D.; Udry, S.; West, R.G.

Three newly discovered sub-Jupiter-mass planets: WASP-69b and WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary Thumbnail


Authors

D.R. Anderson

A. Collier Cameron

L. Delrez

A.P. Doyle

F. Faedi

A. Fumel

M. Gillon

Y. Gómez Maqueo Chew

E. Jehin

M. Lendl

F. Pepe

D. Pollacco

D. Queloz

D. Ségransan

I. Skillen

A.M.S. Smith

A.H.M.J. Triaud

O.D. Turner

S. Udry

R.G. West



Abstract

We report the discovery of the transiting exoplanets WASP-69b, WASP-70Ab and WASP-84b, each of which orbits a bright star (V ~ 10). WASP-69b is a bloated Saturn-mass planet (0.26 MJup, 1.06 RJup) in a 3.868-d period around an active, ~1-Gyr, mid-K dwarf. ROSAT detected X-rays 60±27 arcsec from WASP-69. If the star is the source then the planet could be undergoing mass-loss at a rate of ~1012 g s-1. This is one to two orders of magnitude higher than the evaporation rate estimated for HD 209458b and HD 189733b, both of which have exhibited anomalously large Lyman a absorption during transit. WASP-70Ab is a sub-Jupiter-mass planet (0.59 MJup, 1.16 RJup) in a 3.713-d orbit around the primary of a spatially resolved, 9–10-Gyr, G4+K3 binary, with a separation of 3.3 arcsec (=800 au). WASP-84b is a sub-Jupiter-mass planet (0.69 MJup, 0.94 RJup) in an 8.523-d orbit around an active, ~1-Gyr, early-K dwarf. Of the transiting planets discovered from the ground to date, WASP-84b has the third-longest period. For the active stars WASP-69 and WASP-84, we pre-whitened the radial velocities using a low-order harmonic series. We found that this reduced the residual scatter more than did the oft-used method of pre-whitening with a fit between residual radial velocity and bisector span. The system parameters were essentially unaffected by pre-whitening.

Journal Article Type Article
Acceptance Date Aug 22, 2014
Online Publication Date Oct 7, 2014
Publication Date Dec 1, 2014
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 445
Issue 2
Pages 1114 -1129
DOI https://doi.org/10.1093/mnras/stu1737
Keywords techniques, photometric techniques, radial velocities planets and satellites, detection planets and satellites, individual, WASP-69b planets and satellites, individual, WASP-70Ab planets and satellites, individual, WASP-84b
Publisher URL http://dx.doi.org/10.1093/mnras/stu1737

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