A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

R. D. Brothwell; C. A. Watson; G. Hébrard; A. H. M. J. Triaud; Heather Cegla; A. Santerne; E. Hébrard; D. R. Anderson; D. Pollacco; E. K. Simpson; F. Bouchy; D. J. A. Brown; Y. Gómez Maqueo Chew; A. Collier Cameron; D. J. Armstrong; S. C. C. Barros; J. Bento; J. Bochinski; V. Burwitz; R. Busuttil; L. Delrez; A. P. Doyle; F. Faedi; A. Fumel; M. Gillon; C. A. Haswell; C. Hellier; E. Jehin; U. Kolb; M. Lendl; C. Liebig; P. F. L. Maxted; J. McCormac; G. R. M. Miller; A. J. Norton; F. Pepe; D. Queloz; J. Rodríguez; D. Ségransan; I. Skillen; B. Smalley; K. G. Stassun; S. Udry; R. G. West; P. J. Wheatley

doi:10.1093/mnras/stu520

A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

R. D. Brothwell, C. A. Watson, G. Hébrard, A. H. M. J. Triaud, Heather Cegla, A. Santerne, E. Hébrard, D. R. Anderson, D. Pollacco, E. K. Simpson, F. Bouchy, D. J. A. Brown, Y. Gómez Maqueo Chew, A. Collier Cameron, D. J. Armstrong, S. C. C. Barros, J. Bento, J. Bochinski, V. Burwitz, R. BusuttilL. Delrez, A. P. Doyle, F. Faedi, A. Fumel, M. Gillon, C. A. Haswell, C. Hellier, E. Jehin, U. Kolb, M. Lendl, C. Liebig, P. F. L. Maxted, J. McCormac, G. R. M. Miller, A. J. Norton, F. Pepe, D. Queloz, J. Rodríguez, D. Ségransan, I. Skillen, B. Smalley, K. G. Stassun, S. Udry, R. G. West, P. J. Wheatley

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Abstract

We present Rossiter-McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles of λ =8°^{+13}_{-12} and λ =-2°^{+17}_{-19}, respectively. Both WASP-13 and WASP-32 have Teff < 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb-Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system with Prot =11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius, R*, and vsin i if a stellar inclination of i* =90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars with Teff < 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.

Original language	English
Pages (from-to)	3392-3401
Journal	Monthly Notices of the Royal Astronomical Society
Volume	440
Issue number	4
Early online date	17 Apr 2014
DOIs	https://doi.org/10.1093/mnras/stu520
Publication status	Published - 01 Jun 2014

Keywords

techniques: photometric
techniques: radial velocities
stars: individual: WASP-13
stars: individual: WASP-32
planetary systems

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10.1093/mnras/stu520

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Brothwell, R. D., Watson, C. A., Hébrard, G., Triaud, A. H. M. J., Cegla, H., Santerne, A., Hébrard, E., Anderson, D. R., Pollacco, D., Simpson, E. K., Bouchy, F., Brown, D. J. A., Chew, Y. G. M., Cameron, A. C., Armstrong, D. J., Barros, S. C. C., Bento, J., Bochinski, J., Burwitz, V., ... Wheatley, P. J. (2014). A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b. Monthly Notices of the Royal Astronomical Society, 440(4), 3392-3401. https://doi.org/10.1093/mnras/stu520

@article{4911efaa0d24485f8e9180cd8287f4bf,

title = "A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b",

abstract = "We present Rossiter-McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles of λ =8°^{+13}_{-12} and λ =-2°^{+17}_{-19}, respectively. Both WASP-13 and WASP-32 have Teff < 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb-Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system with Prot =11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius, R*, and vsin i if a stellar inclination of i* =90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars with Teff < 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.",

keywords = "techniques: photometric, techniques: radial velocities, stars: individual: WASP-13, stars: individual: WASP-32, planetary systems",

author = "Brothwell, {R. D.} and Watson, {C. A.} and G. H{\'e}brard and Triaud, {A. H. M. J.} and Heather Cegla and A. Santerne and E. H{\'e}brard and Anderson, {D. R.} and D. Pollacco and Simpson, {E. K.} and F. Bouchy and Brown, {D. J. A.} and Chew, {Y. G{\'o}mez Maqueo} and Cameron, {A. Collier} and Armstrong, {D. J.} and Barros, {S. C. C.} and J. Bento and J. Bochinski and V. Burwitz and R. Busuttil and L. Delrez and Doyle, {A. P.} and F. Faedi and A. Fumel and M. Gillon and Haswell, {C. A.} and C. Hellier and E. Jehin and U. Kolb and M. Lendl and C. Liebig and Maxted, {P. F. L.} and J. McCormac and Miller, {G. R. M.} and Norton, {A. J.} and F. Pepe and D. Queloz and J. Rodr{\'i}guez and D. S{\'e}gransan and I. Skillen and B. Smalley and Stassun, {K. G.} and S. Udry and West, {R. G.} and Wheatley, {P. J.}",

year = "2014",

month = jun,

day = "1",

doi = "10.1093/mnras/stu520",

language = "English",

volume = "440",

pages = "3392--3401",

journal = "Monthly Notices of the Royal Astronomical Society",

publisher = "Oxford University Press",

number = "4",

}

Brothwell, RD, Watson, CA, Hébrard, G, Triaud, AHMJ, Cegla, H, Santerne, A, Hébrard, E, Anderson, DR, Pollacco, D, Simpson, EK, Bouchy, F, Brown, DJA, Chew, YGM, Cameron, AC, Armstrong, DJ, Barros, SCC, Bento, J, Bochinski, J, Burwitz, V, Busuttil, R, Delrez, L, Doyle, AP, Faedi, F, Fumel, A, Gillon, M, Haswell, CA, Hellier, C, Jehin, E, Kolb, U, Lendl, M, Liebig, C, Maxted, PFL, McCormac, J, Miller, GRM, Norton, AJ, Pepe, F, Queloz, D, Rodríguez, J, Ségransan, D, Skillen, I, Smalley, B, Stassun, KG, Udry, S, West, RG & Wheatley, PJ 2014, 'A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b', Monthly Notices of the Royal Astronomical Society, vol. 440, no. 4, pp. 3392-3401. https://doi.org/10.1093/mnras/stu520

TY - JOUR

T1 - A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

AU - Brothwell, R. D.

AU - Watson, C. A.

AU - Hébrard, G.

AU - Triaud, A. H. M. J.

AU - Cegla, Heather

AU - Santerne, A.

AU - Hébrard, E.

AU - Anderson, D. R.

AU - Pollacco, D.

AU - Simpson, E. K.

AU - Bouchy, F.

AU - Brown, D. J. A.

AU - Chew, Y. Gómez Maqueo

AU - Cameron, A. Collier

AU - Armstrong, D. J.

AU - Barros, S. C. C.

AU - Bento, J.

AU - Bochinski, J.

AU - Burwitz, V.

AU - Busuttil, R.

AU - Delrez, L.

AU - Doyle, A. P.

AU - Faedi, F.

AU - Fumel, A.

AU - Gillon, M.

AU - Haswell, C. A.

AU - Hellier, C.

AU - Jehin, E.

AU - Kolb, U.

AU - Lendl, M.

AU - Liebig, C.

AU - Maxted, P. F. L.

AU - McCormac, J.

AU - Miller, G. R. M.

AU - Norton, A. J.

AU - Pepe, F.

AU - Queloz, D.

AU - Rodríguez, J.

AU - Ségransan, D.

AU - Skillen, I.

AU - Smalley, B.

AU - Stassun, K. G.

AU - Udry, S.

AU - West, R. G.

AU - Wheatley, P. J.

PY - 2014/6/1

Y1 - 2014/6/1

N2 - We present Rossiter-McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles of λ =8°^{+13}_{-12} and λ =-2°^{+17}_{-19}, respectively. Both WASP-13 and WASP-32 have Teff < 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb-Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system with Prot =11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius, R*, and vsin i if a stellar inclination of i* =90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars with Teff < 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.

AB - We present Rossiter-McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles of λ =8°^{+13}_{-12} and λ =-2°^{+17}_{-19}, respectively. Both WASP-13 and WASP-32 have Teff < 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb-Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system with Prot =11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius, R*, and vsin i if a stellar inclination of i* =90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars with Teff < 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.

KW - techniques: photometric

KW - techniques: radial velocities

KW - stars: individual: WASP-13

KW - stars: individual: WASP-32

KW - planetary systems

U2 - 10.1093/mnras/stu520

DO - 10.1093/mnras/stu520

M3 - Article

VL - 440

SP - 3392

EP - 3401

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

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Keywords

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