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The well-aligned orbit of Wasp-84b : evidence for disk migration of a hot Jupiter

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Date
10/02/2015
Author
Anderson, D. R.
Triaud, A. H. M. J.
Turner, O. D.
Brown, D. J. A.
Clark, B. J. M.
Smalley, B.
Cameron, A. Collier
Doyle, A. P.
Gillon, M.
Hellier, C.
Lovis, C.
Maxted, P. F. L.
Pollacco, D.
Queloz, D.
Smith, A. M. S.
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
PPARC - Now STFC
Science & Technology Facilities Council
Science & Technology Facilities Council
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/J001651/1
ST/I000666/1
PP/D000890/1
ST/K001515/1
ST/M001296/1
ST/G001006/1
PP/F000065/1
Keywords
Planets and satellites: dynamical evolution and stability
Planet-disk interactions
Planets and satellites: individual (WASP-84b)
Planet-star interactions
Stars: individual (WASP-84)
Exoplanet HD 80606B
Tidal dissipation
Stellar obliquity
Giant planet
Long-period
Transit
Spin
System
Misalignment
Evolution
QB Astronomy
QC Physics
3rd-DAS
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Abstract
We report the sky-projected orbital obliquity (spin–orbit angle) of WASP-84 b, a 0.69 planet in an 8.52 day orbit around a G9V/K0V star, to be λ = −0.3 ± 1.7°. We obtain a true obliquity of ψ = 17.3 ± 7.7° from a measurement of the inclination of the stellar spin axis with respect to the sky plane. Due to the young age and the weak tidal forcing of the system, we suggest that the orbit of WASP-84b is unlikely to have both realigned and circularized from the misaligned and/or eccentric orbit likely to have arisen from high-eccentricity migration. Therefore we conclude that the planet probably migrated via interaction with the protoplanetary disk. This would make it the first "hot Jupiter" () to have been shown to have migrated via this pathway. Further, we argue that the distribution of obliquities for planets orbiting cool stars (Teff < 6250 K) suggests that high-eccentricity migration is an important pathway for the formation of short-orbit, giant planets.
Citation
Anderson , D R , Triaud , A H M J , Turner , O D , Brown , D J A , Clark , B J M , Smalley , B , Cameron , A C , Doyle , A P , Gillon , M , Hellier , C , Lovis , C , Maxted , P F L , Pollacco , D , Queloz , D & Smith , A M S 2015 , ' The well-aligned orbit of Wasp-84b : evidence for disk migration of a hot Jupiter ' , Astrophysical Journal Letters , vol. 800 , no. 1 , L9 . https://doi.org/10.1088/2041-8205/800/1/L9
Publication
Astrophysical Journal Letters
Status
Peer reviewed
DOI
https://doi.org/10.1088/2041-8205/800/1/L9
ISSN
2041-8205
Type
Journal article
Rights
© 2015. The American Astronomical Society. All rights reserved. Reproduced in accordance with the AAS copyright policy. The final version can be found at: http://dx.doi.org/10.1088/2041-8205/800/1/L9
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/6191

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