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, S. Calchi Novati, M. Dominik, X. S. Fang, F. Finet, T. Gerner, S. Hardis, T. C. Hinse, U. G. Jørgensen, C. Liebig, N. Nikolov, D. Ricci, S. Schäfer & 26 others F. Schönebeck, J. Skottfelt, O. Wertz, Khalid Al-Subai, V. Bozza, P. Browne, P. Dodds, S. H. Gu, K. Harpsøe, Th Henning, M. Hundertmark, J. Jessen-Hansen, N. Kains, E. Kerins, H. Kjeldsen, M. N. Lund, M. Lundkvist, N. Madhusudhan, M. Mathiasen, M. T. Penny, S. Prof, S. Rahvar, K. Sahu, G. Scarpetta, C. Snodgrass, J. Surdej

Research output: Contribution to journalArticle

40 Citations (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 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.

Original languageEnglish
Pages (from-to)2-18
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume436
Issue number1
DOIs
Publication statusPublished - 1 Nov 2013

Fingerprint

planetary systems
photometry
transit
planets
emission spectra
planet
physical property
physical properties
color
infrared detectors
gamma ray bursts
near infrared
extrasolar planets
filters
light curve
filter
telescopes
starspots
atmospheres
wavelength

Keywords

  • Fundamental parameters - stars
  • Individual
  • Photometric - stars
  • Techniques
  • WASP-19 - planetary systems - starspots.

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry. / Mancini, L.; Ciceri, S.; Chen, G.; Tregloan-Reed, J.; Fortney, J. J.; Southworth, J.; Tan, T. G.; Burgdorf, M.; Calchi Novati, S.; Dominik, M.; Fang, X. S.; Finet, F.; Gerner, T.; Hardis, S.; Hinse, T. C.; Jørgensen, U. G.; Liebig, C.; Nikolov, N.; Ricci, D.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Wertz, O.; Al-Subai, Khalid; Bozza, V.; Browne, P.; Dodds, P.; Gu, S. H.; Harpsøe, K.; Henning, Th; Hundertmark, M.; Jessen-Hansen, J.; Kains, N.; Kerins, E.; Kjeldsen, H.; Lund, M. N.; Lundkvist, M.; Madhusudhan, N.; Mathiasen, M.; Penny, M. T.; Prof, S.; Rahvar, S.; Sahu, K.; Scarpetta, G.; Snodgrass, C.; Surdej, J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 436, No. 1, 01.11.2013, p. 2-18.

Research output: Contribution to journalArticle

Mancini, L, Ciceri, S, Chen, G, Tregloan-Reed, J, Fortney, JJ, Southworth, J, Tan, TG, Burgdorf, M, Calchi Novati, S, Dominik, M, Fang, XS, Finet, F, Gerner, T, Hardis, S, Hinse, TC, Jørgensen, UG, Liebig, C, Nikolov, N, Ricci, D, Schäfer, S, Schönebeck, F, Skottfelt, J, Wertz, O, Al-Subai, K, Bozza, V, Browne, P, Dodds, P, Gu, SH, Harpsøe, K, Henning, T, Hundertmark, M, Jessen-Hansen, J, Kains, N, Kerins, E, Kjeldsen, H, Lund, MN, Lundkvist, M, Madhusudhan, N, Mathiasen, M, Penny, MT, Prof, S, Rahvar, S, Sahu, K, Scarpetta, G, Snodgrass, C & Surdej, J 2013, 'Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry', Monthly Notices of the Royal Astronomical Society, vol. 436, no. 1, pp. 2-18. https://doi.org/10.1093/mnras/stt1394
Mancini, L. ; Ciceri, S. ; Chen, G. ; Tregloan-Reed, J. ; Fortney, J. J. ; Southworth, J. ; Tan, T. G. ; Burgdorf, M. ; Calchi Novati, S. ; Dominik, M. ; Fang, X. S. ; Finet, F. ; Gerner, T. ; Hardis, S. ; Hinse, T. C. ; Jørgensen, U. G. ; Liebig, C. ; Nikolov, N. ; Ricci, D. ; Schäfer, S. ; Schönebeck, F. ; Skottfelt, J. ; Wertz, O. ; Al-Subai, Khalid ; Bozza, V. ; Browne, P. ; Dodds, P. ; Gu, S. H. ; Harpsøe, K. ; Henning, Th ; Hundertmark, M. ; Jessen-Hansen, J. ; Kains, N. ; Kerins, E. ; Kjeldsen, H. ; Lund, M. N. ; Lundkvist, M. ; Madhusudhan, N. ; Mathiasen, M. ; Penny, M. T. ; Prof, S. ; Rahvar, S. ; Sahu, K. ; Scarpetta, G. ; Snodgrass, C. ; Surdej, J. / Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 436, No. 1. pp. 2-18.
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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 - Calchi Novati, S.

AU - Dominik, M.

AU - Fang, X. S.

AU - Finet, F.

AU - Gerner, T.

AU - Hardis, S.

AU - Hinse, T. C.

AU - Jørgensen, U. G.

AU - Liebig, C.

AU - Nikolov, N.

AU - Ricci, D.

AU - Schäfer, S.

AU - Schönebeck, F.

AU - Skottfelt, J.

AU - Wertz, O.

AU - Al-Subai, Khalid

AU - Bozza, V.

AU - Browne, P.

AU - Dodds, P.

AU - Gu, S. H.

AU - Harpsøe, K.

AU - Henning, Th

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Kains, N.

AU - Kerins, E.

AU - Kjeldsen, H.

AU - Lund, M. N.

AU - Lundkvist, M.

AU - Madhusudhan, N.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Prof, S.

AU - Rahvar, S.

AU - Sahu, K.

AU - Scarpetta, G.

AU - Snodgrass, C.

AU - Surdej, J.

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.

KW - Fundamental parameters - stars

KW - Individual

KW - Photometric - stars

KW - Techniques

KW - WASP-19 - planetary systems - starspots.

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