J/ApJ/819/27 OAO/MuSCAT light curves of HAT-P-14b (Fukui+, 2016)
Demonstrating high-precision, multiband transit photometry with MuSCAT:
a case for HAT-P-14b.
Fukui A., Narita N., Kawashima Y., Kusakabe N., Onitsuka M., Ryu T.,
Ikoma M., Yanagisawa K., Izumiura H.
<Astrophys. J., 819, 27 (2016)>
=2016ApJ...819...27F 2016ApJ...819...27F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, SDSS
Keywords: planets and satellites: atmospheres;
planets and satellites: individual: HAT-P-14b;
stars: individual: HAT-P-14; techniques: photometric
Abstract:
The Multicolor Simultaneous Camera for studying Atmospheres of
Transiting exoplanets (MuSCAT) is an optical three-band (g'2-,
r'2- and zs,2-band) imager that was recently developed for the
188cm telescope at Okayama Astrophysical Observatory with the aim of
validating and characterizing transiting planets. In a pilot
observation with MuSCAT we observed a primary transit of HAT-P-14b, a
high-surface gravity (gp=38ms-2) hot Jupiter around a bright
(V=10) F-type star. From a 2.9hr observation we achieved the
five-minute binned photometric precisions of 0.028%, 0.022%, and
0.024% in the g'2, r'2, and zs,2 bands, respectively, which
provided the highest-quality photometric data for this planet.
Combining these results with those of previous observations, we search
for variations of transit timing and duration over five years as well
as variations of planet-star radius ratio (Rp/Rs) with wavelengths,
but can find no considerable variation in any parameters. On the other
hand, using the transit-subtracted light curves we simulate the
achievable measurement error of Rp/Rs with MuSCAT for various
planetary sizes, assuming three types of host stars: HAT-P-14, the
nearby K-dwarf HAT-P-11, and the nearby M-dwarf GJ1214. Comparing our
results with the expected atmospheric scale heights, we find that
MuSCAT is capable of probing the atmospheres of planets as small as a
sub-Jupiter (Rp∼6R{earth}) around HAT-P-14 in all bands, a Neptune
(∼4R{earth}) around HAT-P-11 in all bands, and a super-Earth
(∼2.5R{earth}) around GJ1214 in r'2 and zs,2 bands. These
results promise that MuSCAT will produce fruitful scientific outcomes
in the K2 and TESS era.
Description:
We conducted a photometric observation for a primary transit of
HAT-P-14b by using the OAO 1.88m telescope equipped with MuSCAT on
2015 April 25 UT.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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17 20 27.87 +38 14 31.9 HAT-P-14 = TYC 3086-152-1 (P=4.63)
17 20 27.87 +38 14 31.9 HAT-P-14b = WASP-27b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 59 1744 Transit light curves of HAT-P-14b obtained
with MuSCAT
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See also:
J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (Sullivan+, 2015)
J/A+A/576/A94 : Northern bright planet host stars parameters (Sousa+, 2015)
J/A+A/575/A18 : Revising the ages of planet-hosting stars (Bonfanti+, 2015)
J/A+A/552/A16 : CoRoT, Kepler, Spitzer limb-darkening. II. (Claret+, 2013)
J/ApJ/761/123 : KELT-1 photometry and spectroscopy follow-up (Siverd+, 2012)
J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012)
J/MNRAS/426/1291 : Physical properties of 38 exoplanets (Southworth, 2012)
J/MNRAS/414/1278 : Eccentricities of transiting planets (Pont+, 2011)
J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)
J/A+A/527/A85 : Light curves of HAT-P-3b and HAT-P-14b (Nascimbeni+, 2011)
J/AJ/141/63 : Relative RVs of HAT-P-4 and HAT-P-14 (Winn+, 2011)
J/PASP/123/412 : Exoplanet Orbit Database (Wright+, 2011)
J/ApJ/715/458 : Differential photometry of HAT-P-14 (Torres+, 2010)
http://exoplanet.eu/ : Extrasolar planets encyclopaedia
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Filt MuSCAT filter (1)
6- 16 F11.6 d BJD Barycentric Julian Day, BJD-2450000
18- 24 F7.5 --- RFlux [0.995/1.011] Relative Flux in Filter
26- 32 F7.5 --- cRFlux [0.991/1.003] Out-of-transit corrected
Relative Flux
34- 40 F7.5 --- e_RFlux [0.0006/0.002] Uncertainty in RFlux (2)
42- 47 F6.4 --- Airmass [1/1.14] Airmass
49- 53 F5.2 pix dx [-2.5/2.1] measured displacement of the
stellar centroids
55- 59 F5.2 pix dy [-3.2/4.4] measured displacement of the
stellar centroids
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Note (1): Filter as follows:
g_2 = OAO 188cm/Sloan g (Astrodon Gen 2; g'2: λcenter=479nm)
r_2 = OAO 188cm/Sloan r (Astrodon Gen 2; r'2: λcenter=629nm)
z_s2 = OAO 188cm/Sloan z_s (Astrodon Gen 2; zs,2: λcenter=869nm)
Note (2): The error is rescaled by the red-noise factor β
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-May-2016