WTS-2 b

A hot Jupiter orbiting near its tidal destruction radius around a K dwarf

J. L. Birkby, M. Cappetta, P. Cruz, J. Koppenhoefer, O. Ivanyuk, A. J. Mustill, S. T. Hodgkin, D. J. Pinfield, B. Sipocz, G. Kovács, R. Saglia, Y. Pavlenko, D. Barrado, A. Bayo, D. Campbell, S. Catalan, L. Fossati, M. C. Gálvez-Ortiz, M. Kenworthy, J. Lillo-Box & 18 others E. L. Martín, Dimitrios Mislis, E. J W de Mooij, S. V. Nefs, I. A G Snellen, H. Stoev, J. Zendejas, C. del Burgo, J. Barnes, N. Goulding, C. A. Haswell, M. Kuznetsov, N. Lodieu, F. Murgas, E. Palle, E. Solano, P. Steele, R. Tata

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We report the discovery of WTS-2 b, an unusually close-in 1.02-d hot Jupiter (MP = 1.12MJ, RP = 1.30RJ) orbiting a K2V star, which has a possible gravitationally bound M-dwarf companion at 0.6 arcsec separation contributing ~20 per cent of the total flux in the observed J-band light curve. The planet is only 1.5 times the separation from its host star at which it would be destroyed by Roche lobe overflow, and has a predicted remaining lifetime of just ~40 Myr, assuming a tidal dissipation quality factor of Q'* = 106 · Q'* is a key factor in determining how frictional processes within a host star affect the orbital evolution of its companion giant planets, but it is currently poorly constrained by observations. We calculate that the orbital decay of WTS-2 b would correspond to a shift in its transit arrival time of Tshift ~ 17 s after 15 yr assuming Q'* = 106. A shift less than this would place a direct observational constraint on the lower limit of Q'* in this system.We also report a correction to the previously published expected Tshift for WASP-18 b, finding that Tshift = 356 s after 10 yr for Q'* = 106, which is much larger than the estimated 28 s quoted in WASP-18 b discovery paper. We attempted to constrain Q via a study of the entire population of known transiting hot Jupiters, but our results were inconclusive, requiring a more detailed treatment of transit survey sensitivities at long periods.We conclude that the most informative and straightforward constraints on Q'* will be obtained by direct observational measurements of the shift in transit arrival times in individual hot Jupiter systems.We show that this is achievable across the mass spectrum of exoplanet host stars within a decade, and will directly probe the effects of stellar interior structure on tidal dissipation.

Original languageEnglish
Article numberstu343
Pages (from-to)1470-1489
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume440
Issue number2
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Jupiter (planet)
Jupiter
destruction
transit
arrival time
stars
radii
dissipation
planet
arrivals
planets
shift
stellar interiors
orbitals
extrasolar planets
probe
lobes
mass spectra
light curve
Q factors

Keywords

  • Planets and satellites: detection
  • Planets and satellites: dynamical evolution and stability
  • Planets and satellites: fundamental parameters
  • Planets and satellites: individual: WTS-2 b
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Birkby, J. L., Cappetta, M., Cruz, P., Koppenhoefer, J., Ivanyuk, O., Mustill, A. J., ... Tata, R. (2014). WTS-2 b: A hot Jupiter orbiting near its tidal destruction radius around a K dwarf. Monthly Notices of the Royal Astronomical Society, 440(2), 1470-1489. [stu343]. https://doi.org/10.1093/mnras/stu343

WTS-2 b : A hot Jupiter orbiting near its tidal destruction radius around a K dwarf. / Birkby, J. L.; Cappetta, M.; Cruz, P.; Koppenhoefer, J.; Ivanyuk, O.; Mustill, A. J.; Hodgkin, S. T.; Pinfield, D. J.; Sipocz, B.; Kovács, G.; Saglia, R.; Pavlenko, Y.; Barrado, D.; Bayo, A.; Campbell, D.; Catalan, S.; Fossati, L.; Gálvez-Ortiz, M. C.; Kenworthy, M.; Lillo-Box, J.; Martín, E. L.; Mislis, Dimitrios; de Mooij, E. J W; Nefs, S. V.; Snellen, I. A G; Stoev, H.; Zendejas, J.; del Burgo, C.; Barnes, J.; Goulding, N.; Haswell, C. A.; Kuznetsov, M.; Lodieu, N.; Murgas, F.; Palle, E.; Solano, E.; Steele, P.; Tata, R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 440, No. 2, stu343, 2014, p. 1470-1489.

Research output: Contribution to journalArticle

Birkby, JL, Cappetta, M, Cruz, P, Koppenhoefer, J, Ivanyuk, O, Mustill, AJ, Hodgkin, ST, Pinfield, DJ, Sipocz, B, Kovács, G, Saglia, R, Pavlenko, Y, Barrado, D, Bayo, A, Campbell, D, Catalan, S, Fossati, L, Gálvez-Ortiz, MC, Kenworthy, M, Lillo-Box, J, Martín, EL, Mislis, D, de Mooij, EJW, Nefs, SV, Snellen, IAG, Stoev, H, Zendejas, J, del Burgo, C, Barnes, J, Goulding, N, Haswell, CA, Kuznetsov, M, Lodieu, N, Murgas, F, Palle, E, Solano, E, Steele, P & Tata, R 2014, 'WTS-2 b: A hot Jupiter orbiting near its tidal destruction radius around a K dwarf', Monthly Notices of the Royal Astronomical Society, vol. 440, no. 2, stu343, pp. 1470-1489. https://doi.org/10.1093/mnras/stu343
Birkby, J. L. ; Cappetta, M. ; Cruz, P. ; Koppenhoefer, J. ; Ivanyuk, O. ; Mustill, A. J. ; Hodgkin, S. T. ; Pinfield, D. J. ; Sipocz, B. ; Kovács, G. ; Saglia, R. ; Pavlenko, Y. ; Barrado, D. ; Bayo, A. ; Campbell, D. ; Catalan, S. ; Fossati, L. ; Gálvez-Ortiz, M. C. ; Kenworthy, M. ; Lillo-Box, J. ; Martín, E. L. ; Mislis, Dimitrios ; de Mooij, E. J W ; Nefs, S. V. ; Snellen, I. A G ; Stoev, H. ; Zendejas, J. ; del Burgo, C. ; Barnes, J. ; Goulding, N. ; Haswell, C. A. ; Kuznetsov, M. ; Lodieu, N. ; Murgas, F. ; Palle, E. ; Solano, E. ; Steele, P. ; Tata, R. / WTS-2 b : A hot Jupiter orbiting near its tidal destruction radius around a K dwarf. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 440, No. 2. pp. 1470-1489.
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abstract = "We report the discovery of WTS-2 b, an unusually close-in 1.02-d hot Jupiter (MP = 1.12MJ, RP = 1.30RJ) orbiting a K2V star, which has a possible gravitationally bound M-dwarf companion at 0.6 arcsec separation contributing ~20 per cent of the total flux in the observed J-band light curve. The planet is only 1.5 times the separation from its host star at which it would be destroyed by Roche lobe overflow, and has a predicted remaining lifetime of just ~40 Myr, assuming a tidal dissipation quality factor of Q'* = 106 · Q'* is a key factor in determining how frictional processes within a host star affect the orbital evolution of its companion giant planets, but it is currently poorly constrained by observations. We calculate that the orbital decay of WTS-2 b would correspond to a shift in its transit arrival time of Tshift ~ 17 s after 15 yr assuming Q'* = 106. A shift less than this would place a direct observational constraint on the lower limit of Q'* in this system.We also report a correction to the previously published expected Tshift for WASP-18 b, finding that Tshift = 356 s after 10 yr for Q'* = 106, which is much larger than the estimated 28 s quoted in WASP-18 b discovery paper. We attempted to constrain Q via a study of the entire population of known transiting hot Jupiters, but our results were inconclusive, requiring a more detailed treatment of transit survey sensitivities at long periods.We conclude that the most informative and straightforward constraints on Q'* will be obtained by direct observational measurements of the shift in transit arrival times in individual hot Jupiter systems.We show that this is achievable across the mass spectrum of exoplanet host stars within a decade, and will directly probe the effects of stellar interior structure on tidal dissipation.",
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TY - JOUR

T1 - WTS-2 b

T2 - A hot Jupiter orbiting near its tidal destruction radius around a K dwarf

AU - Birkby, J. L.

AU - Cappetta, M.

AU - Cruz, P.

AU - Koppenhoefer, J.

AU - Ivanyuk, O.

AU - Mustill, A. J.

AU - Hodgkin, S. T.

AU - Pinfield, D. J.

AU - Sipocz, B.

AU - Kovács, G.

AU - Saglia, R.

AU - Pavlenko, Y.

AU - Barrado, D.

AU - Bayo, A.

AU - Campbell, D.

AU - Catalan, S.

AU - Fossati, L.

AU - Gálvez-Ortiz, M. C.

AU - Kenworthy, M.

AU - Lillo-Box, J.

AU - Martín, E. L.

AU - Mislis, Dimitrios

AU - de Mooij, E. J W

AU - Nefs, S. V.

AU - Snellen, I. A G

AU - Stoev, H.

AU - Zendejas, J.

AU - del Burgo, C.

AU - Barnes, J.

AU - Goulding, N.

AU - Haswell, C. A.

AU - Kuznetsov, M.

AU - Lodieu, N.

AU - Murgas, F.

AU - Palle, E.

AU - Solano, E.

AU - Steele, P.

AU - Tata, R.

PY - 2014

Y1 - 2014

N2 - We report the discovery of WTS-2 b, an unusually close-in 1.02-d hot Jupiter (MP = 1.12MJ, RP = 1.30RJ) orbiting a K2V star, which has a possible gravitationally bound M-dwarf companion at 0.6 arcsec separation contributing ~20 per cent of the total flux in the observed J-band light curve. The planet is only 1.5 times the separation from its host star at which it would be destroyed by Roche lobe overflow, and has a predicted remaining lifetime of just ~40 Myr, assuming a tidal dissipation quality factor of Q'* = 106 · Q'* is a key factor in determining how frictional processes within a host star affect the orbital evolution of its companion giant planets, but it is currently poorly constrained by observations. We calculate that the orbital decay of WTS-2 b would correspond to a shift in its transit arrival time of Tshift ~ 17 s after 15 yr assuming Q'* = 106. A shift less than this would place a direct observational constraint on the lower limit of Q'* in this system.We also report a correction to the previously published expected Tshift for WASP-18 b, finding that Tshift = 356 s after 10 yr for Q'* = 106, which is much larger than the estimated 28 s quoted in WASP-18 b discovery paper. We attempted to constrain Q via a study of the entire population of known transiting hot Jupiters, but our results were inconclusive, requiring a more detailed treatment of transit survey sensitivities at long periods.We conclude that the most informative and straightforward constraints on Q'* will be obtained by direct observational measurements of the shift in transit arrival times in individual hot Jupiter systems.We show that this is achievable across the mass spectrum of exoplanet host stars within a decade, and will directly probe the effects of stellar interior structure on tidal dissipation.

AB - We report the discovery of WTS-2 b, an unusually close-in 1.02-d hot Jupiter (MP = 1.12MJ, RP = 1.30RJ) orbiting a K2V star, which has a possible gravitationally bound M-dwarf companion at 0.6 arcsec separation contributing ~20 per cent of the total flux in the observed J-band light curve. The planet is only 1.5 times the separation from its host star at which it would be destroyed by Roche lobe overflow, and has a predicted remaining lifetime of just ~40 Myr, assuming a tidal dissipation quality factor of Q'* = 106 · Q'* is a key factor in determining how frictional processes within a host star affect the orbital evolution of its companion giant planets, but it is currently poorly constrained by observations. We calculate that the orbital decay of WTS-2 b would correspond to a shift in its transit arrival time of Tshift ~ 17 s after 15 yr assuming Q'* = 106. A shift less than this would place a direct observational constraint on the lower limit of Q'* in this system.We also report a correction to the previously published expected Tshift for WASP-18 b, finding that Tshift = 356 s after 10 yr for Q'* = 106, which is much larger than the estimated 28 s quoted in WASP-18 b discovery paper. We attempted to constrain Q via a study of the entire population of known transiting hot Jupiters, but our results were inconclusive, requiring a more detailed treatment of transit survey sensitivities at long periods.We conclude that the most informative and straightforward constraints on Q'* will be obtained by direct observational measurements of the shift in transit arrival times in individual hot Jupiter systems.We show that this is achievable across the mass spectrum of exoplanet host stars within a decade, and will directly probe the effects of stellar interior structure on tidal dissipation.

KW - Planets and satellites: detection

KW - Planets and satellites: dynamical evolution and stability

KW - Planets and satellites: fundamental parameters

KW - Planets and satellites: individual: WTS-2 b

KW - Surveys

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DO - 10.1093/mnras/stu343

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