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. Kains & 21 others E. 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

10 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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