The transiting system GJ1214: High-precision defocused transit observations and a search for evidence of transit timing variation

K. B W Harpsøe, S. Hardis, T. C. Hinse, U. G. Jørgensen, L. Mancini, J. Southworth, Khalid Al-Subai, V. Bozza, P. Browne, M. J. Burgdorf, S. Calchi Novati, P. Dodds, M. Dominik, X. S. Fang, F. Finet, T. Gerner, S. H. Gu, M. Hundertmark, J. Jessen-Hansen, N. KainsE. Kerins, H. Kjeldsen, C. Liebig, M. N. Lund, M. Lundkvist, M. Mathiasen, D. Nesvorný, N. Nikolov, M. T. Penny, S. Proft, S. Rahvar, D. Ricci, K. C. Sahu, G. Scarpetta, S. Schäfer, F. Schönebeck, C. Snodgrass, J. Skottfelt, J. Surdej, J. Tregloan-Reed, O. Wertz

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ≠1214≠b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results. The observations are used to determine the photometric parameters and the physical properties of the GJ≠1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10 s, allowing us to reduce the uncertainty in the orbital period by a factor of two. Conclusions. A Bayesian analysis reveals that it is highly improbable that the observed transit times is explained by TTV caused by a planet in the nominal habitable zone, when compared with the simpler alternative of a linear ephemeris.

Original languageEnglish
Article numberA10
JournalAstronomy and Astrophysics
Volume549
DOIs
Publication statusPublished - 12 Dec 2012

Fingerprint

transit
planet
time measurement
Bayesian analysis
physical property
random errors
defocusing
transit time
light curve
photometry
planets
physical properties
method
telescopes
orbitals
parameter

Keywords

  • Methods: observational
  • Methods: statistical
  • Planetary systems
  • Stars: individual: GJ1214
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Harpsøe, K. B. W., Hardis, S., Hinse, T. C., Jørgensen, U. G., Mancini, L., Southworth, J., ... Wertz, O. (2012). The transiting system GJ1214: High-precision defocused transit observations and a search for evidence of transit timing variation. Astronomy and Astrophysics, 549, [A10]. https://doi.org/10.1051/0004-6361/201219996

The transiting system GJ1214 : High-precision defocused transit observations and a search for evidence of transit timing variation. / Harpsøe, K. B W; Hardis, S.; Hinse, T. C.; Jørgensen, U. G.; Mancini, L.; Southworth, J.; Al-Subai, Khalid; Bozza, V.; Browne, P.; Burgdorf, M. J.; Calchi Novati, S.; Dodds, P.; Dominik, M.; Fang, X. S.; Finet, F.; Gerner, T.; Gu, S. H.; Hundertmark, M.; Jessen-Hansen, J.; Kains, N.; Kerins, E.; Kjeldsen, H.; Liebig, C.; Lund, M. N.; Lundkvist, M.; Mathiasen, M.; Nesvorný, D.; Nikolov, N.; Penny, M. T.; Proft, S.; Rahvar, S.; Ricci, D.; Sahu, K. C.; Scarpetta, G.; Schäfer, S.; Schönebeck, F.; Snodgrass, C.; Skottfelt, J.; Surdej, J.; Tregloan-Reed, J.; Wertz, O.

In: Astronomy and Astrophysics, Vol. 549, A10, 12.12.2012.

Research output: Contribution to journalArticle

Harpsøe, KBW, Hardis, S, Hinse, TC, Jørgensen, UG, Mancini, L, Southworth, J, Al-Subai, K, Bozza, V, Browne, P, Burgdorf, MJ, Calchi Novati, S, Dodds, P, Dominik, M, Fang, XS, Finet, F, Gerner, T, Gu, SH, Hundertmark, M, Jessen-Hansen, J, Kains, N, Kerins, E, Kjeldsen, H, Liebig, C, Lund, MN, Lundkvist, M, Mathiasen, M, Nesvorný, D, Nikolov, N, Penny, MT, Proft, S, Rahvar, S, Ricci, D, Sahu, KC, Scarpetta, G, Schäfer, S, Schönebeck, F, Snodgrass, C, Skottfelt, J, Surdej, J, Tregloan-Reed, J & Wertz, O 2012, 'The transiting system GJ1214: High-precision defocused transit observations and a search for evidence of transit timing variation', Astronomy and Astrophysics, vol. 549, A10. https://doi.org/10.1051/0004-6361/201219996
Harpsøe, K. B W ; Hardis, S. ; Hinse, T. C. ; Jørgensen, U. G. ; Mancini, L. ; Southworth, J. ; Al-Subai, Khalid ; Bozza, V. ; Browne, P. ; Burgdorf, M. J. ; Calchi Novati, S. ; Dodds, P. ; Dominik, M. ; Fang, X. S. ; Finet, F. ; Gerner, T. ; Gu, S. H. ; Hundertmark, M. ; Jessen-Hansen, J. ; Kains, N. ; Kerins, E. ; Kjeldsen, H. ; Liebig, C. ; Lund, M. N. ; Lundkvist, M. ; Mathiasen, M. ; Nesvorný, D. ; Nikolov, N. ; Penny, M. T. ; Proft, S. ; Rahvar, S. ; Ricci, D. ; Sahu, K. C. ; Scarpetta, G. ; Schäfer, S. ; Schönebeck, F. ; Snodgrass, C. ; Skottfelt, J. ; Surdej, J. ; Tregloan-Reed, J. ; Wertz, O. / The transiting system GJ1214 : High-precision defocused transit observations and a search for evidence of transit timing variation. In: Astronomy and Astrophysics. 2012 ; Vol. 549.
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abstract = "Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ{\^a}‰ 1214{\^a}‰ b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results. The observations are used to determine the photometric parameters and the physical properties of the GJ{\^a}‰ 1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10 s, allowing us to reduce the uncertainty in the orbital period by a factor of two. Conclusions. A Bayesian analysis reveals that it is highly improbable that the observed transit times is explained by TTV caused by a planet in the nominal habitable zone, when compared with the simpler alternative of a linear ephemeris.",
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author = "Harps{\o}e, {K. B W} and S. Hardis and Hinse, {T. C.} and J{\o}rgensen, {U. G.} and L. Mancini and J. Southworth and Khalid Al-Subai and V. Bozza and P. Browne and Burgdorf, {M. J.} and {Calchi Novati}, S. and P. Dodds and M. Dominik and Fang, {X. S.} and F. Finet and T. Gerner and Gu, {S. H.} and M. Hundertmark and J. Jessen-Hansen and N. Kains and E. Kerins and H. Kjeldsen and C. Liebig and Lund, {M. N.} and M. Lundkvist and M. Mathiasen and D. Nesvorn{\'y} and N. Nikolov and Penny, {M. T.} and S. Proft and S. Rahvar and D. Ricci and Sahu, {K. C.} and G. Scarpetta and S. Sch{\"a}fer and F. Sch{\"o}nebeck and C. Snodgrass and J. Skottfelt and J. Surdej and J. Tregloan-Reed and O. Wertz",
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T1 - The transiting system GJ1214

T2 - High-precision defocused transit observations and a search for evidence of transit timing variation

AU - Harpsøe, K. B W

AU - Hardis, S.

AU - Hinse, T. C.

AU - Jørgensen, U. G.

AU - Mancini, L.

AU - Southworth, J.

AU - Al-Subai, Khalid

AU - Bozza, V.

AU - Browne, P.

AU - Burgdorf, M. J.

AU - Calchi Novati, S.

AU - Dodds, P.

AU - Dominik, M.

AU - Fang, X. S.

AU - Finet, F.

AU - Gerner, T.

AU - Gu, S. H.

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Kains, N.

AU - Kerins, E.

AU - Kjeldsen, H.

AU - Liebig, C.

AU - Lund, M. N.

AU - Lundkvist, M.

AU - Mathiasen, M.

AU - Nesvorný, D.

AU - Nikolov, N.

AU - Penny, M. T.

AU - Proft, S.

AU - Rahvar, S.

AU - Ricci, D.

AU - Sahu, K. C.

AU - Scarpetta, G.

AU - Schäfer, S.

AU - Schönebeck, F.

AU - Snodgrass, C.

AU - Skottfelt, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wertz, O.

PY - 2012/12/12

Y1 - 2012/12/12

N2 - Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ≠1214≠b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results. The observations are used to determine the photometric parameters and the physical properties of the GJ≠1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10 s, allowing us to reduce the uncertainty in the orbital period by a factor of two. Conclusions. A Bayesian analysis reveals that it is highly improbable that the observed transit times is explained by TTV caused by a planet in the nominal habitable zone, when compared with the simpler alternative of a linear ephemeris.

AB - Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ≠1214≠b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results. The observations are used to determine the photometric parameters and the physical properties of the GJ≠1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10 s, allowing us to reduce the uncertainty in the orbital period by a factor of two. Conclusions. A Bayesian analysis reveals that it is highly improbable that the observed transit times is explained by TTV caused by a planet in the nominal habitable zone, when compared with the simpler alternative of a linear ephemeris.

KW - Methods: observational

KW - Methods: statistical

KW - Planetary systems

KW - Stars: individual: GJ1214

KW - Techniques: photometric

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