High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55

John Southworth, J. Tregloan-Reed, M. I. Andersen, S. Calchi Novati, S. Ciceri, J. P. Colque, G. D'Ago, M. Dominik, D. F. Evans, S. H. Gu, A. Herrera-Cordova, T. C. Hinse, U. G. Jørgensen, D. Juncher, M. Kuffmeier, L. Mancini, N. Peixinho, A. Popovas, M. Rabus, J. SkottfeltR. Tronsgaard, E. Unda-Sanzana, X. B. Wang, O. Wertz, Khalid Al-Subai, J. M. Andersen, V. Bozza, D. M. Bramich, M. Burgdorf, Y. Damerdji, C. Diehl, A. Elyiv, R. Figuera Jaimes, T. Haugbølle, M. Hundertmark, N. Kains, E. Kerins, H. Korhonen, C. Liebig, M. Mathiasen, M. T. Penny, S. Rahvar, G. Scarpetta, R. W. Schmidt, C. Snodgrass, D. Starkey, J. Surdej, C. Vilela, C. von Essen, Y. Wang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present 13 high-precision and four additional light curves of four bright southernhemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 and WASP-55. In the cases of WASP-42 and WASP-55, these are the first follow-up observations since their discovery papers. We present refined measurements of the physical properties and orbital ephemerides of all four systems. No indications of transit timing variations were seen. All four planets have radii inflated above those expected from theoretical models of gas-giant planets; WASP-55 b is the most discrepant with a mass of 0.63MJup and a radius of 1.34 RJup. WASP-41 shows brightness anomalies during transit due to the planet occulting spots on the stellar surface. Two anomalies observed 3.1 d apart are very likely due to the same spot. We measure its change in position and determine a rotation period for the host star of 18.6 ± 1.5 d, in good agreement with a published measurement from spot-induced brightness modulation, and a sky-projected orbital obliquity of λ = 6 ± 11°. We conclude with a compilation of obliquity measurements from spot-tracking analyses and a discussion of this technique in the study of the orbital configurations of hot Jupiters.

Original languageEnglish
Pages (from-to)4205-4217
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume457
Issue number4
DOIs
Publication statusPublished - 10 Feb 2016

Fingerprint

wasp
photometry
planet
obliquity
telescopes
transit
orbitals
planets
brightness
gas giant planets
anomalies
ephemerides
anomaly
radii
planetary systems
Jupiter (planet)
Jupiter
light curve
sky
indication

Keywords

  • Planetary systems
  • Stars: fundamental parameters
  • Stars: individual: WASP-22
  • WASP- 42
  • WASP-41
  • WASP-55

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Southworth, J., Tregloan-Reed, J., Andersen, M. I., Calchi Novati, S., Ciceri, S., Colque, J. P., ... Wang, Y. (2016). High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55. Monthly Notices of the Royal Astronomical Society, 457(4), 4205-4217. https://doi.org/10.1093/mnras/stw279

High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55. / Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M.; Evans, D. F.; Gu, S. H.; Herrera-Cordova, A.; Hinse, T. C.; Jørgensen, U. G.; Juncher, D.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Skottfelt, J.; Tronsgaard, R.; Unda-Sanzana, E.; Wang, X. B.; Wertz, O.; Al-Subai, Khalid; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Burgdorf, M.; Damerdji, Y.; Diehl, C.; Elyiv, A.; Figuera Jaimes, R.; Haugbølle, T.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Liebig, C.; Mathiasen, M.; Penny, M. T.; Rahvar, S.; Scarpetta, G.; Schmidt, R. W.; Snodgrass, C.; Starkey, D.; Surdej, J.; Vilela, C.; von Essen, C.; Wang, Y.

In: Monthly Notices of the Royal Astronomical Society, Vol. 457, No. 4, 10.02.2016, p. 4205-4217.

Research output: Contribution to journalArticle

Southworth, J, Tregloan-Reed, J, Andersen, MI, Calchi Novati, S, Ciceri, S, Colque, JP, D'Ago, G, Dominik, M, Evans, DF, Gu, SH, Herrera-Cordova, A, Hinse, TC, Jørgensen, UG, Juncher, D, Kuffmeier, M, Mancini, L, Peixinho, N, Popovas, A, Rabus, M, Skottfelt, J, Tronsgaard, R, Unda-Sanzana, E, Wang, XB, Wertz, O, Al-Subai, K, Andersen, JM, Bozza, V, Bramich, DM, Burgdorf, M, Damerdji, Y, Diehl, C, Elyiv, A, Figuera Jaimes, R, Haugbølle, T, Hundertmark, M, Kains, N, Kerins, E, Korhonen, H, Liebig, C, Mathiasen, M, Penny, MT, Rahvar, S, Scarpetta, G, Schmidt, RW, Snodgrass, C, Starkey, D, Surdej, J, Vilela, C, von Essen, C & Wang, Y 2016, 'High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55', Monthly Notices of the Royal Astronomical Society, vol. 457, no. 4, pp. 4205-4217. https://doi.org/10.1093/mnras/stw279
Southworth J, Tregloan-Reed J, Andersen MI, Calchi Novati S, Ciceri S, Colque JP et al. High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55. Monthly Notices of the Royal Astronomical Society. 2016 Feb 10;457(4):4205-4217. https://doi.org/10.1093/mnras/stw279
Southworth, John ; Tregloan-Reed, J. ; Andersen, M. I. ; Calchi Novati, S. ; Ciceri, S. ; Colque, J. P. ; D'Ago, G. ; Dominik, M. ; Evans, D. F. ; Gu, S. H. ; Herrera-Cordova, A. ; Hinse, T. C. ; Jørgensen, U. G. ; Juncher, D. ; Kuffmeier, M. ; Mancini, L. ; Peixinho, N. ; Popovas, A. ; Rabus, M. ; Skottfelt, J. ; Tronsgaard, R. ; Unda-Sanzana, E. ; Wang, X. B. ; Wertz, O. ; Al-Subai, Khalid ; Andersen, J. M. ; Bozza, V. ; Bramich, D. M. ; Burgdorf, M. ; Damerdji, Y. ; Diehl, C. ; Elyiv, A. ; Figuera Jaimes, R. ; Haugbølle, T. ; Hundertmark, M. ; Kains, N. ; Kerins, E. ; Korhonen, H. ; Liebig, C. ; Mathiasen, M. ; Penny, M. T. ; Rahvar, S. ; Scarpetta, G. ; Schmidt, R. W. ; Snodgrass, C. ; Starkey, D. ; Surdej, J. ; Vilela, C. ; von Essen, C. ; Wang, Y. / High-precision photometry by telescope defocussing - VIII.WASP-22, WASP-41,WASP-42 andWASP-55. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 457, No. 4. pp. 4205-4217.
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abstract = "We present 13 high-precision and four additional light curves of four bright southernhemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 and WASP-55. In the cases of WASP-42 and WASP-55, these are the first follow-up observations since their discovery papers. We present refined measurements of the physical properties and orbital ephemerides of all four systems. No indications of transit timing variations were seen. All four planets have radii inflated above those expected from theoretical models of gas-giant planets; WASP-55 b is the most discrepant with a mass of 0.63MJup and a radius of 1.34 RJup. WASP-41 shows brightness anomalies during transit due to the planet occulting spots on the stellar surface. Two anomalies observed 3.1 d apart are very likely due to the same spot. We measure its change in position and determine a rotation period for the host star of 18.6 ± 1.5 d, in good agreement with a published measurement from spot-induced brightness modulation, and a sky-projected orbital obliquity of λ = 6 ± 11°. We conclude with a compilation of obliquity measurements from spot-tracking analyses and a discussion of this technique in the study of the orbital configurations of hot Jupiters.",
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AU - Southworth, John

AU - Tregloan-Reed, J.

AU - Andersen, M. I.

AU - Calchi Novati, S.

AU - Ciceri, S.

AU - Colque, J. P.

AU - D'Ago, G.

AU - Dominik, M.

AU - Evans, D. F.

AU - Gu, S. H.

AU - Herrera-Cordova, A.

AU - Hinse, T. C.

AU - Jørgensen, U. G.

AU - Juncher, D.

AU - Kuffmeier, M.

AU - Mancini, L.

AU - Peixinho, N.

AU - Popovas, A.

AU - Rabus, M.

AU - Skottfelt, J.

AU - Tronsgaard, R.

AU - Unda-Sanzana, E.

AU - Wang, X. B.

AU - Wertz, O.

AU - Al-Subai, Khalid

AU - Andersen, J. M.

AU - Bozza, V.

AU - Bramich, D. M.

AU - Burgdorf, M.

AU - Damerdji, Y.

AU - Diehl, C.

AU - Elyiv, A.

AU - Figuera Jaimes, R.

AU - Haugbølle, T.

AU - Hundertmark, M.

AU - Kains, N.

AU - Kerins, E.

AU - Korhonen, H.

AU - Liebig, C.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Rahvar, S.

AU - Scarpetta, G.

AU - Schmidt, R. W.

AU - Snodgrass, C.

AU - Starkey, D.

AU - Surdej, J.

AU - Vilela, C.

AU - von Essen, C.

AU - Wang, Y.

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KW - Stars: fundamental parameters

KW - Stars: individual: WASP-22

KW - WASP- 42

KW - WASP-41

KW - WASP-55

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