J/A+A/559/A32 Light curves of GJ3470b (Nascimbeni+, 2013)
The blue sky of GJ 3470b: the atmosphere of a low-mass planet unveiled by
ground-based photometry.
Nascimbeni V., Piotto G., Pagano I., Scandariato G., Sani E., Fumana M.
<Astron. Astrophys., 559, A32-32 (2013)>
=2013A&A...559A..32N 2013A&A...559A..32N
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry
Keywords: techniques: photometric - planetary systems -
stars: individual: GJ3470
Abstract:
GJ3470b is a rare example of a "hot Uranus" transiting exoplanet
orbiting a nearby M1.5 dwarf. It is crucial for atmospheric studies
because it is one of the most inflated low-mass planets known,
bridging the boundary between "super-Earths" and Neptunian planets.
We present two new ground-based light curves of GJ3470b gathered by
the LBC camera at the Large Binocular Telescope. Simultaneous
photometry in the ultraviolet (λc=357.5nm) and optical
infrared (λc=963.5nm) allowed us to detect a significant
change in the effective radius of GJ3470b as a function of wavelength.
This can be interpreted as a signature of scattering processes
occurring in the planetary atmosphere, which should be cloud-free and
with a low mean molecular weight. The unprecedented accuracy of our
measurements demonstrates that the photometric detection of
Earth-sized planets around M dwarfs is achievable using 8-10m size
ground-based telescopes. We provide updated planetary parameters and a
greatly improved orbital ephemeris for any forthcoming study of this
planet.
Objects:
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RA (2000) DE Designation(s) (Per)
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07 59 05.9 +15 23 29 GJ3470 = LP 424-4 (3.336649)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lcb.dat 47 131 LBC U_spec light curve of GJ3470b
lcr.dat 47 146 LBC F972N20 light curve of GJ3470b
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See also:
J/A+A/527/A85 : Light curves of HAT-P-3b and HAT-P-14b (Nascimbeni+, 2011)
J/A+A/532/A24 : Light curves of HAT-P-13b (Nascimbeni+, 2011)
J/A+A/549/A30 : Light curves of WASP-3b (Nascimbeni+, 2013)
Byte-by-byte Description of file: lcb.dat lcr.dat
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Bytes Format Units Label Explanations
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1- 15 F15.6 d BJD Barycentric Julian Day (UTC-based)
23- 31 F9.6 mag mag Normalized magnitude
39- 47 F9.6 mag e_mag Error on magnitude
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Acknowledgements:
Valerio Nascimbeni, valerio.nascimbeni(at)unipd.it
References:
Nascimbeni et al., Paper I 2011A&A...527A..85N 2011A&A...527A..85N, Cat. J/A+A/527/A85
Nascimbeni et al., Paper II 2011A&A...532A..24N 2011A&A...532A..24N, Cat. J/A+A/532/A24
Nascimbeni et al., Paper III 2013A&A...549A..30N 2013A&A...549A..30N, Cat. J/A+A/549/A30
(End) Valerio Nascimbeni [INAF-OAPD, Italy], Patricia Vannier [CDS] 10-Mar-2014