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

被引：57

作者：

Harpsoe, K. B. W. ^{[1
,2
]}

Hardis, S. ^{[1
,2
]}

Hinse, T. C. ^{[3
]}

Jorgensen, G. ^{[1
,2
]}

Mancini, L. ^{[9
,12
,17
]}

Southworth, J. ^{[4
]}

Alsubai, K. A. ^{[8
]}

Bozza, V. ^{[9
,11
]}

Browne, P. ^{[5
]}

Burgdorf, M. J. ^{[10
]}

Novati, S. Calchi ^{[9
,12
]}

Dodds, P. ^{[5
]}

Dominik, M. ^{[5
]}

Fang, X. -S. ^{[21
]}

Finet, F. ^{[15
]}

Gerner, T. ^{[16
]}

Gu, S. -H ^{[21
]}

Hundertmark, M. ^{[5
,13
]}

Jessen-Hansen, J. ^{[20
]}

Kains, N. ^{[5
,14
]}

Kerins, E. ^{[18
]}

Kjeldsen, H. ^{[20
]}

Liebig, C. ^{[5
]}

Lund, M. N. ^{[20
]}

Lundkvist, M. ^{[20
]}

Mathiasen, M. ^{[1
]}

Nesvorny, D. ^{[23
]}

Nikolov, N. ^{[17
]}

Penny, M. T. ^{[18
]}

Proft, S. ^{[16
]}

Rahvar, S. ^{[6
,22
]}

Ricci, D. ^{[15
]}

Sahu, K. C. ^{[19
]}

Scarpetta, G. ^{[9
,11
,12
]}

Schaefer, S. ^{[13
]}

Schoenebeck, F. ^{[16
]}

Snodgrass, C. ^{[7
]}

Skottfelt, J. ^{[1
,2
]}

Surdej, J. ^{[15
]}

Tregloan-Reed, J. ^{[5
]}

Wertz, O. ^{[15
]}

机构：

[1] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[2] Nat Hist Museum Denmark, Ctr Star & Planet Format, DK-1350 Copenhagen, Denmark

[3] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[4] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[5] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[6] Sharif Univ Technol, Dept Phys, Tehran, Iran

[7] Max Planck Inst Solar Syst Res, D-37191 Katlenburg Lindau, Germany

[8] Qatar Fdn, Doha, Qatar

[9] Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, SA, Italy

[10] HE Space Operat GmbH, D-28199 Bremen, Germany

[11] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[12] IIASS, I-84019 Vietri Sul Mare, SA, Italy

[13] Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany

[14] European So Observ, D-85748 Garching, Germany

[15] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[16] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, D-69120 Heidelberg, Germany

[17] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[18] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[19] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[20] Aarhus Univ, Dept Phys & Astron, SAC, DK-8000 Aarhus C, Denmark

[21] Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China

[22] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[23] SW Res Inst, Dept Space Studies, Boulder, CO 80302 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 549卷

关键词：

planetray systems; stars: individual: GJ1214; methods: statistical; methods: observational; techniques: photometric; EXTRASOLAR PLANETS; ECLIPSING BINARIES; OPEN CLUSTERS; MASS; ATMOSPHERE; PHOTOMETRY; EFFICIENT; III;

D O I：

10.1051/0004-6361/201219996

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：10

共 33 条

[1] Ocean planet or thick atmosphere: On the mass-radius relationship for solid exoplanets with massive atmospheres [J].

Adams, E. R. ;

Seager, S. ;

Elkins-Tanton, L. .

ASTROPHYSICAL JOURNAL, 2008, 673 (02) :1160-1164

[2] On detecting terrestrial planets with timing of giant planet transits [J].

Agol, E ;

Steffen, J ;

Sari, R ;

Clarkson, W .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 359 (02) :567-579

[3]

[Anonymous], 2005, Bayesian logical data analysis for the physical sciences: a comparative approach with mathematica support

[4] THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS [J].

Berta, Zachory K. ;

Charbonneau, David ;

Bean, Jacob ;

Irwin, Jonathan ;

Burke, Christopher J. ;

Desert, Jean-Michel ;

Nutzman, Philip ;

Falco, Emilio E. .

ASTROPHYSICAL JOURNAL, 2011, 736 (01)

[5] THE TRANSIT LIGHT CURVE PROJECT. XIII. SIXTEEN TRANSITS OF THE SUPER-EARTH GJ 1214b [J].

Carter, Joshua A. ;

Winn, Joshua N. ;

Holman, Matthew J. ;

Fabrycky, Daniel ;

Berta, Zachory K. ;

Burke, Christopher J. ;

Nutzman, Philip .

ASTROPHYSICAL JOURNAL, 2011, 730 (02)

[6]

Charbonneau D., 2008, Bulletin of the American Astronomical Society, V40, P242

[7] A super-Earth transiting a nearby low-mass star [J].

Charbonneau, David ;

Berta, Zachory K. ;

Irwin, Jonathan ;

Burke, Christopher J. ;

Nutzman, Philip ;

Buchhave, Lars A. ;

Lovis, Christophe ;

Bonfils, Xavier ;

Latham, David W. ;

Udry, Stephane ;

Murray-Clay, Ruth A. ;

Holman, Matthew J. ;

Falco, Emilio E. ;

Winn, Joshua N. ;

Queloz, Didier ;

Pepe, Francesco ;

Mayor, Michel ;

Delfosse, Xavier ;

Forveille, Thierry .

NATURE, 2009, 462 (7275) :891-894

[8] A new non-linear limb-darkening law for LTE stellar atmosphere models III -: Sloan filters:: Calculations for -5.0≤log [M/H]≤+1, 2000 K≤Teff≤50000 K at several surface gravities [J].

Claret, A .

ASTRONOMY & ASTROPHYSICS, 2004, 428 (03) :1001-1005

[9]

Claret A., 2000, VIZIER ONLINE DATA C

[10] THE DARTMOUTH STELLAR EVOLUTION DATABASE [J].

Dotter, Aaron ;

Chaboyer, Brian ;

Jevremovic, Darko ;

Kostov, Veselin ;

Baron, E. ;

Ferguson, Jason W. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2008, 178 (01) :89-101

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