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

K. B. W. Harpsoe; S. Hardis; T. C. Hinse; G. Jorgensen; 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; J. Jessen-Hansen; Noé Kains; E. Kerins; H. Kjeldsen; C. Liebig; M. N. Lund; M. Lundkvist; M. Mathiasen; D. Nesvorny; N. Nikolov; M. T. Penny; S. Proft; S. Rahvar; D. Ricci; K. C. Sahu; G. Scarpetta; S. Schaefer; F. Schoenebeck; 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. Harpsoe^*, S. Hardis, T. C. Hinse, G. Jorgensen, 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, J. Jessen-Hansen, Noé KainsE. Kerins, H. Kjeldsen, C. Liebig, M. N. Lund, M. Lundkvist, M. Mathiasen, D. Nesvorny, N. Nikolov, M. T. Penny, S. Proft, S. Rahvar, D. Ricci, K. C. Sahu, G. Scarpetta, S. Schaefer, F. Schoenebeck, C. Snodgrass, J. Skottfelt, J. Surdej, J. Tregloan-Reed, O. Wertz

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Aims. We present 11 high-precision photometric transit observations 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 techinques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possiblity 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 uncertainites as low as 10 s, allowing us to reduce the uncertainity in the orbital period by a factor or 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 language	English
Article number	A10
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	549
Early online date	6 Dec 2012
DOIs	https://doi.org/10.1051/0004-6361/201219996
Publication status	Published - Jan 2013

Keywords

Planetray systems
Stars: individual: GJ1214
Methods: statistical
Methods: observational
Techniques: photometric
Extrasolar planets
Eclipsing binaries
GJ 1214B
Physical-properties
Additional planets
Open clusters
Mass
Photometry
Atmosphere
Exoplanets

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10.1051/0004-6361/201219996

harpsoe2013a&aA10
Credit: Harpsøe, A&A, 549., A10, 2013, reproduced with permission, © ESO
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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard

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Harpsoe, K. B. W., Hardis, S., Hinse, T. C., Jorgensen, 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., Jessen-Hansen, J., ... Wertz, O. (2013). The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation. Astronomy & Astrophysics, 549, Article A10. https://doi.org/10.1051/0004-6361/201219996

@article{72dfc08594ee4305b4bbcb36150d730b,

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 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 techinques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possiblity 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 uncertainites as low as 10 s, allowing us to reduce the uncertainity in the orbital period by a factor or 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.",

keywords = "Planetray systems, Stars: individual: GJ1214, Methods: statistical, Methods: observational, Techniques: photometric, Extrasolar planets, Eclipsing binaries, GJ 1214B, Physical-properties, Additional planets, Open clusters, Mass, Photometry, Atmosphere, Exoplanets",

author = "Harpsoe, {K. B. W.} and S. Hardis and Hinse, {T. C.} and G. Jorgensen 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 J. Jessen-Hansen and No{\'e} Kains and E. Kerins and H. Kjeldsen and C. Liebig and Lund, {M. N.} and M. Lundkvist and M. Mathiasen and D. Nesvorny 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. Schaefer and F. Schoenebeck and C. Snodgrass and J. Skottfelt and J. Surdej and J. Tregloan-Reed and O. Wertz",

year = "2013",

month = jan,

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

language = "English",

volume = "549",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Harpsoe, KBW, Hardis, S, Hinse, TC, Jorgensen, G, Mancini, L, Southworth, J, Alsubai, KA, Bozza, V, Browne, P, Burgdorf, MJ, 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, MN, Lundkvist, M, Mathiasen, M, Nesvorny, D, Nikolov, N, Penny, MT, Proft, S, Rahvar, S, Ricci, D, Sahu, KC, Scarpetta, G, Schaefer, S, Schoenebeck, F, Snodgrass, C, Skottfelt, J, Surdej, J, Tregloan-Reed, J & Wertz, O 2013, 'The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation', Astronomy & Astrophysics, vol. 549, A10. https://doi.org/10.1051/0004-6361/201219996

TY - JOUR

T1 - The transiting system GJ1214

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

AU - Harpsoe, K. B. W.

AU - Hardis, S.

AU - Hinse, T. C.

AU - Jorgensen, 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 - Jessen-Hansen, J.

AU - Kains, Noé

AU - Kerins, E.

AU - Kjeldsen, H.

AU - Liebig, C.

AU - Lund, M. N.

AU - Lundkvist, M.

AU - Mathiasen, M.

AU - Nesvorny, 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 - Schaefer, S.

AU - Schoenebeck, F.

AU - Snodgrass, C.

AU - Skottfelt, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wertz, O.

PY - 2013/1

Y1 - 2013/1

N2 - Aims. We present 11 high-precision photometric transit observations 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 techinques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possiblity 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 uncertainites as low as 10 s, allowing us to reduce the uncertainity in the orbital period by a factor or 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 transit observations 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 techinques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possiblity 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 uncertainites as low as 10 s, allowing us to reduce the uncertainity in the orbital period by a factor or 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 - Planetray systems

KW - Stars: individual: GJ1214

KW - Methods: statistical

KW - Methods: observational

KW - Techniques: photometric

KW - Extrasolar planets

KW - Eclipsing binaries

KW - GJ 1214B

KW - Physical-properties

KW - Additional planets

KW - Open clusters

KW - Mass

KW - Photometry

KW - Atmosphere

KW - Exoplanets

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

M1 - A10

ER -

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

Abstract

Keywords

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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

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