High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star

John Southworth; L. Mancini; S. Calchi Novati; M. Dominik; M. Glitrup; T. C. Hinse; U. G. Jorgensen; M. Mathiasen; D. Ricci; G. Maier; F. Zimmer; V. Bozza; P. Browne; I. Bruni; M. Burgdorf; M. Dall'Ora; F. Finet; K. Harpsoe; M. Hundertmark; C. Liebig; S. Rahvar; G. Scarpetta; J. Skottfelt; B. Smalley; C. Snodgrass; J. Surdej

doi:10.1111/j.1365-2966.2010.17238.x

High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star

John Southworth, L. Mancini, S. Calchi Novati, M. Dominik, M. Glitrup, T. C. Hinse, U. G. Jorgensen, M. Mathiasen, D. Ricci, G. Maier, F. Zimmer, V. Bozza, P. Browne, I. Bruni, M. Burgdorf, M. Dall'Ora, F. Finet, K. Harpsoe, M. Hundertmark, C. LiebigS. Rahvar, G. Scarpetta, J. Skottfelt, B. Smalley, C. Snodgrass, J. Surdej

School of Physics and Astronomy

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49 Citations (Scopus)

Abstract

We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocusing the telescopes, and achieving scatters of between 0.42 and 0.73 mmag versus the best-fitting model. These data are modelled using the jktebop code, and taking into account the light from the recently discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic error bars to be specified. We find the mass and radius of the planet to be M-b = 0.846 +/- 0.055 +/- 0.023 M-Jup and R-b = 1.043 +/- 0.029 +/- 0.015R(Jup). It has a low equilibrium temperature of 1281 +/- 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit data sets has a scatter of only 0.42 mmag with respect to the best-fitting light-curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planetary system.

Original language	English
Pages (from-to)	1680-1688
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	408
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2010.17238.x
Publication status	Published - 1 Nov 2010

Keywords

binaries: eclipsing
stars: individual: WASP-2
planetary systems
TIDAL-EVOLUTION CONSTANTS
M-CIRCLE-DOT
DETACHED ECLIPSING BINARIES
STELLAR ATMOSPHERE MODELS
LIMB-DARKENING LAW
EXTRASOLAR PLANETS
SURFACE GRAVITIES
OPEN CLUSTERS
LIGHT CURVES
PHYSICAL-PROPERTIES

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Southworth, J., Mancini, L., Calchi Novati, S., Dominik, M., Glitrup, M., Hinse, T. C., Jorgensen, U. G., Mathiasen, M., Ricci, D., Maier, G., Zimmer, F., Bozza, V., Browne, P., Bruni, I., Burgdorf, M., Dall'Ora, M., Finet, F., Harpsoe, K., Hundertmark, M., ... Surdej, J. (2010). High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star. Monthly Notices of the Royal Astronomical Society, 408(3), 1680-1688. https://doi.org/10.1111/j.1365-2966.2010.17238.x

@article{f2735b2237bf4e1e9a8fa40ae4e6bf7a,

title = "High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star",

abstract = "We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocusing the telescopes, and achieving scatters of between 0.42 and 0.73 mmag versus the best-fitting model. These data are modelled using the jktebop code, and taking into account the light from the recently discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic error bars to be specified. We find the mass and radius of the planet to be M-b = 0.846 +/- 0.055 +/- 0.023 M-Jup and R-b = 1.043 +/- 0.029 +/- 0.015R(Jup). It has a low equilibrium temperature of 1281 +/- 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit data sets has a scatter of only 0.42 mmag with respect to the best-fitting light-curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planetary system.",

keywords = "binaries: eclipsing, stars: individual: WASP-2, planetary systems, TIDAL-EVOLUTION CONSTANTS, M-CIRCLE-DOT, DETACHED ECLIPSING BINARIES, STELLAR ATMOSPHERE MODELS, LIMB-DARKENING LAW, EXTRASOLAR PLANETS, SURFACE GRAVITIES, OPEN CLUSTERS, LIGHT CURVES, PHYSICAL-PROPERTIES",

author = "John Southworth and L. Mancini and {Calchi Novati}, S. and M. Dominik and M. Glitrup and Hinse, {T. C.} and Jorgensen, {U. G.} and M. Mathiasen and D. Ricci and G. Maier and F. Zimmer and V. Bozza and P. Browne and I. Bruni and M. Burgdorf and M. Dall'Ora and F. Finet and K. Harpsoe and M. Hundertmark and C. Liebig and S. Rahvar and G. Scarpetta and J. Skottfelt and B. Smalley and C. Snodgrass and J. Surdej",

year = "2010",

month = nov,

day = "1",

doi = "10.1111/j.1365-2966.2010.17238.x",

language = "English",

volume = "408",

pages = "1680--1688",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Southworth, J, Mancini, L, Calchi Novati, S, Dominik, M, Glitrup, M, Hinse, TC, Jorgensen, UG, Mathiasen, M, Ricci, D, Maier, G, Zimmer, F, Bozza, V, Browne, P, Bruni, I, Burgdorf, M, Dall'Ora, M, Finet, F, Harpsoe, K, Hundertmark, M, Liebig, C, Rahvar, S, Scarpetta, G, Skottfelt, J, Smalley, B, Snodgrass, C & Surdej, J 2010, 'High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star', Monthly Notices of the Royal Astronomical Society, vol. 408, no. 3, pp. 1680-1688. https://doi.org/10.1111/j.1365-2966.2010.17238.x

TY - JOUR

T1 - High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star

AU - Southworth, John

AU - Mancini, L.

AU - Calchi Novati, S.

AU - Dominik, M.

AU - Glitrup, M.

AU - Hinse, T. C.

AU - Jorgensen, U. G.

AU - Mathiasen, M.

AU - Ricci, D.

AU - Maier, G.

AU - Zimmer, F.

AU - Bozza, V.

AU - Browne, P.

AU - Bruni, I.

AU - Burgdorf, M.

AU - Dall'Ora, M.

AU - Finet, F.

AU - Harpsoe, K.

AU - Hundertmark, M.

AU - Liebig, C.

AU - Rahvar, S.

AU - Scarpetta, G.

AU - Skottfelt, J.

AU - Smalley, B.

AU - Snodgrass, C.

AU - Surdej, J.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocusing the telescopes, and achieving scatters of between 0.42 and 0.73 mmag versus the best-fitting model. These data are modelled using the jktebop code, and taking into account the light from the recently discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic error bars to be specified. We find the mass and radius of the planet to be M-b = 0.846 +/- 0.055 +/- 0.023 M-Jup and R-b = 1.043 +/- 0.029 +/- 0.015R(Jup). It has a low equilibrium temperature of 1281 +/- 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit data sets has a scatter of only 0.42 mmag with respect to the best-fitting light-curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planetary system.

AB - We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocusing the telescopes, and achieving scatters of between 0.42 and 0.73 mmag versus the best-fitting model. These data are modelled using the jktebop code, and taking into account the light from the recently discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic error bars to be specified. We find the mass and radius of the planet to be M-b = 0.846 +/- 0.055 +/- 0.023 M-Jup and R-b = 1.043 +/- 0.029 +/- 0.015R(Jup). It has a low equilibrium temperature of 1281 +/- 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit data sets has a scatter of only 0.42 mmag with respect to the best-fitting light-curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planetary system.

KW - binaries: eclipsing

KW - stars: individual: WASP-2

KW - planetary systems

KW - TIDAL-EVOLUTION CONSTANTS

KW - M-CIRCLE-DOT

KW - DETACHED ECLIPSING BINARIES

KW - STELLAR ATMOSPHERE MODELS

KW - LIMB-DARKENING LAW

KW - EXTRASOLAR PLANETS

KW - SURFACE GRAVITIES

KW - OPEN CLUSTERS

KW - LIGHT CURVES

KW - PHYSICAL-PROPERTIES

U2 - 10.1111/j.1365-2966.2010.17238.x

DO - 10.1111/j.1365-2966.2010.17238.x

M3 - Article

SN - 0035-8711

VL - 408

SP - 1680

EP - 1688

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2 star

Abstract

Keywords

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