J/MNRAS/436/2 Transits of WASP-19b (Mancini+, 2013)
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., Jorgensen U.G.,
Liebig C., Nikolov N., Ricci D., Schafer S., Schonebeck F., Skottfelt J.,
Wertz O., Alsubai K.A., Bozza V., Browne P., Dodds P., Gu S.-H., Harpsoe K.,
Henning T., 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.
<Mon. Not. R. Astron. Soc. 436, 2 (2013)>
=2013MNRAS.436....2M 2013MNRAS.436....2M
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry
Keywords: techniques: photometric - stars: fundamental parameters -
stars: individual: WASP-19 - planetary systems - starspots
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 Survey Telescope (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
370-2350nm wavelength range and its emission spectrum over the
750-8000nm 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.
Description:
15 light curves of nine transits of the extrasolar planetary system
WASP-419 are presented.
Seven of the datasets were obtained using the MPG/ESO 2.2m telescope,
GROND camera and filters similar to Sloan-g', Sloan-r', Sloan-i',
Sloan-z', J, H and K at the ESO Observatory in La Silla (Chile) in
2012.
Another eight data sets were obtained using the 1.54m Danish
telescope, DFOSC camera and Gunn-i filter at La Silla (Chile) in 2010
and 2011.
Objects:
---------------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------------
09 53 40.077 -45 39 33.06 WASP-19 = GSC 08181-01711
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
transits.dat 31 15 Summary of the observed transits
eso_g.dat 40 114 Photometry of WASP-19 on 2012/04/15 (g ESO 2.2m)
eso_i.dat 40 114 Photometry of WASP-19 on 2012/04/15 (r ESO 2.2m)
eso_r.dat 40 114 Photometry of WASP-19 on 2012/04/15 (i ESO 2.2m)
eso_z.dat 40 114 Photometry of WASP-19 on 2012/04/15 (z ESO 2.2m)
eso_h.dat 40 322 Photometry of WASP-19 on 2012/04/15 (J ESO 2.2m)
eso_j.dat 40 322 Photometry of WASP-19 on 2012/04/15 (H ESO 2.2m)
eso_k.dat 40 339 Photometry of WASP-19 on 2012/04/15 (K ESO 2.2m)
dk_01.dat 40 121 Photometry of WASP-19 on 2010/05/17 (i dk 1.54m)
dk_02.dat 40 59 Photometry of WASP-19 on 2010/06/01 (i dk 1.54m)
dk_03.dat 40 79 Photometry of WASP-19 on 2010/06/05 (i dk 1.54m)
dk_04.dat 40 90 Photometry of WASP-19 on 2010/06/20 (i dk 1.54m)
dk_05.dat 40 120 Photometry of WASP-19 on 2011/05/07 (i dk 1.54m)
dk_06.dat 40 121 Photometry of WASP-19 on 2011/05/11 (i dk 1.54m)
dk_07.dat 40 71 Photometry of WASP-19 on 2011/05/22 (i dk 1.54m)
dk_08.dat 40 121 Photometry of WASP-19 on 2011/05/26 (i dk 1.54m)
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See also:
J/A+A/558/A55 : Trans. planetary system HATS-2 (Mohler-Fischer+, 2013)
J/A+A/554/A28 : Transiting planetary system Qatar-1 (Covino+, 2013)
J/A+A/549/A10 : Transiting planetary system GJ1214 (Harpsoe+, 2013)
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/MNRAS/426/1338 : Transiting planetary system WASP-17 (Southworth+, 2012)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/A+A/557/A30 : Trans. planetary systems WASP-21 HAT-P-16 (Ciceri+, 2013)
J/MNRAS/430/2932 : Transiting planetary system WASP-44 (Mancini+, 2013)
J/MNRAS/422/3099 : Transiting planetary system HAT-P-5 (Southworth+, 2012)
J/A+A/551/A11 : Transiting planetary system HAT-P-8 (Mancini+, 2013)
J/MNRAS/420/2580 : Transiting planetary system HAT-P-13 (Southworth+, 2012)
Byte-by-byte Description of file: transits.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- FileName Name of the file with the transit
11- 20 A10 "Y-M-D" Date Date of observation
22 A1 --- Band [grizJHK] Filter
24- 31 A8 --- Tel Telescope (ESO-2.2m dk-1.54m)
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Byte-by-byte Description of file: dk_0?.dat eso_?.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian date
18- 27 F10.7 --- NFlux Normalized flux
30- 38 F9.7 --- e_NFlux rms uncertainty on NFlux
40 A1 --- Band [grizJHK] Band
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Acknowledgements:
Luigi Mancini, mancini(at)mpia-hd.mpg.de
(End) Patricia Vannier [CDS] 14-Nov-2013