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; K A Alsubai; 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; N Kains; 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

doi:10.1051/0004-6361/201219996

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, K A Alsubai, 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, N Kains, E KerinsH 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

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Abstract

Aims: We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ1214b. 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 1mmag 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 GJ1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10s, 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, when compared with the simpler alternative of a linear ephemeris.

Original language	English
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	549
DOIs	https://doi.org/10.1051/0004-6361/201219996
Publication status	Published - 11 Sept 2012

Keywords

Astrophysics - Earth and Planetary Astrophysics

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10.1051/0004-6361/201219996

http://ukads.nottingham.ac.uk/abs/2012arXiv1207.3064H

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Harpsøe, K. B. W., Hardis, S., Hinse, T. C., Jørgensen, U. G., Mancini, L., Southworth, J., Alsubai, K. A., 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., Kains, N., ... Wertz, O. (2012). The Transiting System GJ1214: High-Precision Defocused Transit Observations and a Search for Evidence of Transit Timing Variation. Astronomy & Astrophysics, 549. https://doi.org/10.1051/0004-6361/201219996

@article{033e58e0c7054268a7535ad5c7bd66c8,

title = "The Transiting System GJ1214: High-Precision Defocused Transit Observations and a Search for Evidence of Transit Timing Variation",

abstract = "Aims: We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ1214b. 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 1mmag 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 GJ1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10s, 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, when compared with the simpler alternative of a linear ephemeris.",

keywords = "Astrophysics - Earth and Planetary Astrophysics",

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 Alsubai, {K A} 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 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",

note = "July 1, 2012 Submitted to A&A; doi:10.1051/0004-6361/201219996",

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day = "11",

doi = "10.1051/0004-6361/201219996",

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Harpsøe, KBW, Hardis, S, Hinse, TC, Jørgensen, UG, Mancini, L, Southworth, J, Alsubai, KA, Bozza, V, Browne, P, Burgdorf, MJ, Calchi Novati, S, Dodds, P, Dominik, M, Fang, XS, Finet, F, Gerner, T, Gu, SH, Hundertmark, M, 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 & Astrophysics, vol. 549. https://doi.org/10.1051/0004-6361/201219996

TY - JOUR

T1 - The Transiting System GJ1214: 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 - Alsubai, K A

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 - 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

N1 - July 1, 2012 Submitted to A&A; doi:10.1051/0004-6361/201219996

PY - 2012/9/11

Y1 - 2012/9/11

N2 - Aims: We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ1214b. 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 1mmag 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 GJ1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10s, 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, when compared with the simpler alternative of a linear ephemeris.

AB - Aims: We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ1214b. 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 1mmag 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 GJ1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10s, 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, when compared with the simpler alternative of a linear ephemeris.

KW - Astrophysics - Earth and Planetary Astrophysics

U2 - 10.1051/0004-6361/201219996

DO - 10.1051/0004-6361/201219996

M3 - Article

SN - 0004-6361

VL - 549

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

The Transiting System GJ1214: High-Precision Defocused Transit Observations and a Search for Evidence of Transit Timing Variation

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