Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry

L. Mancini; S. Ciceri; G. Chen; J. Tregloan-Reed; J.J. Fortney; J. Southworth; T.G. Tan; M. Burgdorf; Uffe Gråe Jørgensen; Kennet Bomann West Harpsøe; M. Mathiasen; Jesper Fælling Skottfelt

doi:10.1093/mnras/stt1394

Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry

L. Mancini, S. Ciceri, G. Chen, J. Tregloan-Reed, J.J. Fortney, J. Southworth, T.G. Tan, M. Burgdorf, Uffe Gråe Jørgensen, Kennet Bomann West Harpsøe, M. Mathiasen, Jesper Fælling Skottfelt

Astrofysik og Planetforskning

54 Citationer (Scopus)

Abstract

We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on observations of eight transits and four occultations through a Gunn i filter using the 1.54-m Danish Telescope, 14 transits through an R_c filter at the Perth Exoplanet SurveyTelescope (PEST) observatory and one transit observed simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (J,H,K) filters, using the Gamma Ray Burst Optical and Near-Infrared Detector (GROND) instrument on the MPG/ESO 2.2-m telescope. The GROND optical light curves have a point-to-point scatter around the best-fitting model between 0.52 and 0.65 mmag rms. We use these new data to measure refined physical parameters for the system. We find the planet to be more bloated (R_b = 1.410 ± 0.017R_Jup; M_b = 1.139 ± 0.030M_Jup) and the system to be twice as old as initially thought. We also used published and archived data sets to study the transit timings, which do not depart from a linear ephemeris. We detected an anomaly in the GROND transit light curve which is compatible with a spot on the photosphere of the parent star. The starspot position, size, spot contrast and temperature were established. Using our new and published measurements, we assembled the planet's transmission spectrum over the 370-2350 nm wavelength range and its emission spectrum over the 750-8000 nm range. By comparing these data to theoretical models we investigated the theoretically predicted variation of the apparent radius of WASP- 19b as a function of wavelength and studied the composition and thermal structure of its atmosphere. We conclude that: (i) there is no evidence for strong optical absorbers at low pressure, supporting the common idea that the planet's atmosphere lacks a dayside inversion; (ii) the temperature of the planet is not homogenized, because the high warming of its dayside causes the planet to be more efficient in re-radiating than redistributing energy to the night side; (iii) the planet seems to be outside of any current classification scheme.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astronomical Society
Vol/bind	436
Udgave nummer	1
Sider (fra-til)	2-18
ISSN	0035-8711
DOI	https://doi.org/10.1093/mnras/stt1394
Status	Udgivet - 1 nov. 2013

Adgang til dokumentet

10.1093/mnras/stt1394

Citationsformater

Mancini, L., Ciceri, S., Chen, G., Tregloan-Reed, J., Fortney, J. J., Southworth, J., Tan, T. G., Burgdorf, M., Jørgensen, U. G., Harpsøe, K. B. W., Mathiasen, M., & Skottfelt, J. F. (2013). Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry. Monthly Notices of the Royal Astronomical Society, 436(1), 2-18. https://doi.org/10.1093/mnras/stt1394

Mancini, L, Ciceri, S, Chen, G, Tregloan-Reed, J, Fortney, JJ, Southworth, J, Tan, TG, Burgdorf, M, Jørgensen, UG, Harpsøe, KBW, Mathiasen, M & Skottfelt, JF 2013, 'Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry', Monthly Notices of the Royal Astronomical Society, bind 436, nr. 1, s. 2-18. https://doi.org/10.1093/mnras/stt1394

@article{1980ab112eb644588b674a9d6e5c3889,

title = "Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry",

abstract = "We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on observations of eight transits and four occultations through a Gunn i filter using the 1.54-m Danish Telescope, 14 transits through an Rc filter at the Perth Exoplanet SurveyTelescope (PEST) observatory and one transit observed simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (J,H,K) filters, using the Gamma Ray Burst Optical and Near-Infrared Detector (GROND) instrument on the MPG/ESO 2.2-m telescope. The GROND optical light curves have a point-to-point scatter around the best-fitting model between 0.52 and 0.65 mmag rms. We use these new data to measure refined physical parameters for the system. We find the planet to be more bloated (Rb = 1.410 ± 0.017RJup; Mb = 1.139 ± 0.030MJup) and the system to be twice as old as initially thought. We also used published and archived data sets to study the transit timings, which do not depart from a linear ephemeris. We detected an anomaly in the GROND transit light curve which is compatible with a spot on the photosphere of the parent star. The starspot position, size, spot contrast and temperature were established. Using our new and published measurements, we assembled the planet's transmission spectrum over the 370-2350 nm wavelength range and its emission spectrum over the 750-8000 nm range. By comparing these data to theoretical models we investigated the theoretically predicted variation of the apparent radius of WASP- 19b as a function of wavelength and studied the composition and thermal structure of its atmosphere. We conclude that: (i) there is no evidence for strong optical absorbers at low pressure, supporting the common idea that the planet's atmosphere lacks a dayside inversion; (ii) the temperature of the planet is not homogenized, because the high warming of its dayside causes the planet to be more efficient in re-radiating than redistributing energy to the night side; (iii) the planet seems to be outside of any current classification scheme.",

author = "L. Mancini and S. Ciceri and G. Chen and J. Tregloan-Reed and J.J. Fortney and J. Southworth and T.G. Tan and M. Burgdorf and J{\o}rgensen, {Uffe Gr{\aa}e} and Harps{\o}e, {Kennet Bomann West} and M. Mathiasen and Skottfelt, {Jesper F{\ae}lling}",

year = "2013",

month = nov,

day = "1",

doi = "10.1093/mnras/stt1394",

language = "English",

volume = "436",

pages = "2--18",

journal = "Royal Astronomical Society. Monthly Notices",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

TY - JOUR

T1 - Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry

AU - Mancini, L.

AU - Ciceri, S.

AU - Chen, G.

AU - Tregloan-Reed, J.

AU - Fortney, J.J.

AU - Southworth, J.

AU - Tan, T.G.

AU - Burgdorf, M.

AU - Jørgensen, Uffe Gråe

AU - Harpsøe, Kennet Bomann West

AU - Mathiasen, M.

AU - Skottfelt, Jesper Fælling

PY - 2013/11/1

Y1 - 2013/11/1

N2 - We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on observations of eight transits and four occultations through a Gunn i filter using the 1.54-m Danish Telescope, 14 transits through an Rc filter at the Perth Exoplanet SurveyTelescope (PEST) observatory and one transit observed simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (J,H,K) filters, using the Gamma Ray Burst Optical and Near-Infrared Detector (GROND) instrument on the MPG/ESO 2.2-m telescope. The GROND optical light curves have a point-to-point scatter around the best-fitting model between 0.52 and 0.65 mmag rms. We use these new data to measure refined physical parameters for the system. We find the planet to be more bloated (Rb = 1.410 ± 0.017RJup; Mb = 1.139 ± 0.030MJup) and the system to be twice as old as initially thought. We also used published and archived data sets to study the transit timings, which do not depart from a linear ephemeris. We detected an anomaly in the GROND transit light curve which is compatible with a spot on the photosphere of the parent star. The starspot position, size, spot contrast and temperature were established. Using our new and published measurements, we assembled the planet's transmission spectrum over the 370-2350 nm wavelength range and its emission spectrum over the 750-8000 nm range. By comparing these data to theoretical models we investigated the theoretically predicted variation of the apparent radius of WASP- 19b as a function of wavelength and studied the composition and thermal structure of its atmosphere. We conclude that: (i) there is no evidence for strong optical absorbers at low pressure, supporting the common idea that the planet's atmosphere lacks a dayside inversion; (ii) the temperature of the planet is not homogenized, because the high warming of its dayside causes the planet to be more efficient in re-radiating than redistributing energy to the night side; (iii) the planet seems to be outside of any current classification scheme.

AB - We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on observations of eight transits and four occultations through a Gunn i filter using the 1.54-m Danish Telescope, 14 transits through an Rc filter at the Perth Exoplanet SurveyTelescope (PEST) observatory and one transit observed simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (J,H,K) filters, using the Gamma Ray Burst Optical and Near-Infrared Detector (GROND) instrument on the MPG/ESO 2.2-m telescope. The GROND optical light curves have a point-to-point scatter around the best-fitting model between 0.52 and 0.65 mmag rms. We use these new data to measure refined physical parameters for the system. We find the planet to be more bloated (Rb = 1.410 ± 0.017RJup; Mb = 1.139 ± 0.030MJup) and the system to be twice as old as initially thought. We also used published and archived data sets to study the transit timings, which do not depart from a linear ephemeris. We detected an anomaly in the GROND transit light curve which is compatible with a spot on the photosphere of the parent star. The starspot position, size, spot contrast and temperature were established. Using our new and published measurements, we assembled the planet's transmission spectrum over the 370-2350 nm wavelength range and its emission spectrum over the 750-8000 nm range. By comparing these data to theoretical models we investigated the theoretically predicted variation of the apparent radius of WASP- 19b as a function of wavelength and studied the composition and thermal structure of its atmosphere. We conclude that: (i) there is no evidence for strong optical absorbers at low pressure, supporting the common idea that the planet's atmosphere lacks a dayside inversion; (ii) the temperature of the planet is not homogenized, because the high warming of its dayside causes the planet to be more efficient in re-radiating than redistributing energy to the night side; (iii) the planet seems to be outside of any current classification scheme.

U2 - 10.1093/mnras/stt1394

DO - 10.1093/mnras/stt1394

M3 - Journal article

SN - 0035-8711

VL - 436

SP - 2

EP - 18

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 1

ER -

Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry

Abstract

Adgang til dokumentet

Fingeraftryk

Citationsformater