J/AJ/147/144 Differential griz photometry of HATS-5 (Zhou+, 2014)
HATS-5b: a transiting hot Saturn from the HATSouth survey.
Zhou G., Bayliss D., Penev K., Bakos G.A., Hartman J.D., Jordan A.,
Mancini L., Mohler M., Csubry Z., Ciceri S., Brahm R., Rabus M.,
Buchhave L., Henning T., Suc V., Espinoza N., Beky B., Noyes R.W.,
Schmidt B., Butler R.P., Shectman S., Thompson I., Crane J., Sato B.,
Csak B., Lazar J., Papp I., Sari P., Nikolov N.
<Astron. J., 147, 144 (2014)>
=2014AJ....147..144Z 2014AJ....147..144Z
ADC_Keywords: Planets ; Stars, double and multiple ; Photometry, ugriz ;
Radial velocities
Keywords: stars: individual: (HATS-5,GSC 5897-00933) - techniques: photometric -
techniques: spectroscopic
Abstract:
We report the discovery of HATS-5b, a transiting hot Saturn orbiting a
G-type star, by the HATSouth survey. HATS-5b has a mass of
Mp~0.24MJ, radius of Rp~0.91RJ, and transits its
host star with a period of P~4.7634days. The radius of HATS-5b
is consistent with both theoretical and empirical models. The host
star has a V-band magnitude of 12.6, mass of 0.94M☉, and radius
of 0.87R☉. The relatively high scale height of HATS-5b and the
bright, photometrically quiet host star make this planet a favorable
target for future transmission spectroscopy follow-up observations. We
reexamine the correlations in radius, equilibrium temperature, and
metallicity of the close-in gas giants and find hot Jupiter-mass
planets to exhibit the strongest dependence between radius and
equilibrium temperature. We find no significant dependence in radius
and metallicity for the close-in gas giant population.
Description:
The transit signal around HATS-5 was first detected from photometric
observations by the HATSouth survey. HATSouth is a network of
identical, fully robotic telescopes located at three sites spread
around the Southern Hemisphere, allowing continuous coverage of the
surveyed fields. Altogether 8066 observations of HATS-5 were obtained
by the HATSouth units HS-1 in Chile and HS-3 in Namibia from 2009
September to 2010 December, and unit HS-5 from 2010 September to 2010
December in Australia. Each unit consists of four 0.18m f/2.8 Takahasi
astrographs and Apogee 4K*4K U16M Alta CCD cameras. The observations
are performed through the Sloan r' filter.
High-precision photometric follow-ups of a partial and a full transit
of HATS-5b were performed on 2012 October 10 and 2012 December 11,
respectively, using GROND on the ESO/MPG 2.2m telescope. The GROND
imager provides simultaneous photometric monitoring in four optical
bands (g', r', i', z').
Low-resolution reconnaissance observations were performed using the
Wide Field Spectrograph (WiFeS) on the Australian National University
(ANU) 2.3m telescope at Siding Spring Observatory, Australia. HATS-5
received nine high-resolution (R=60000) reconnaissance radial velocity
observations with the CORALIE spectrograph on the Swiss Leonard Euler
1.2m telescope at La Silla Observatory, Chile, and 14 R=48000
observations with the FEROS spectrograph on the ESO/Max Planck
Gesellschaft (MPG) 2.2m telescope at La Silla.
Velocities of HATS-5 were obtained by the Planet Finding Spectrograph
(PFS) on the 6.5m Magellan Baade telescope at Las Campanas
Observatory, Chile, and the High Dispersion Spectrograph (HDS) on the
8.2m Subaru telescope at Manua Kea Observatory, Hawaii (Table3).
Objects:
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RA (ICRS) DE Designation(s) (Period)
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04 28 53.49 -21 28 54.9 HATS-5 = GSC 05897-00933 (P=4.763387)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 55 24 Relative radial velocities and bisector span
measurements of HATS-5
table4.dat 45 9419 Differential photometry of HATS-5
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See also:
J/AJ/146/113 : Differential griz photometry of HATS-3 (Bayliss+, 2013)
J/A+A/558/A55 : HATS-2b griz light curves (Mohler-Fischer+, 2013)
J/AJ/145/5 : Follow-up photometry of HATS-1 (Penev+, 2013)
J/ApJ/742/59 : HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)
J/ApJ/734/109 : Follow-up photometry of HAT-P-27 (Beky+, 2011)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d BJD Barycentric Julian Date (BJD-2400000)
13- 18 F6.2 m/s RV [-31.21/35.2]? Radial velocity (1)
20- 23 F4.2 m/s e_RV ? The 1σ uncertainty in RV (2)
25- 29 F5.1 m/s BS ? Bissector span measurement
31- 34 F4.1 m/s e_BS ? The 1σ uncertainty in BS
36- 40 F5.3 --- Phase [0/1] Phase
42- 47 A6 --- Inst Instrument (Subaru or PFS) (3)
49- 55 A7 --- f_Inst Iodine free HDS template observation (4)
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Note (1): An instrumental offset in the velocities (γrel) from each
instrument was fitted for and subtracted in the analysis and the values
presented in this table.
Note (2): Internal errors excluding the component of astrophysical/instrumental
jitter considered in Section 3.
Note (3): Instruments used are defined as follows:
PFS = Planet Finding Spectrograph (on the 6.5m Magellan Baade telescope at
Las Campanas Observatory, Chile).
Subaru = (High Dispersion Spectrograph) on the 8.2m Subaru telescope at Manua
Kea Observatory, Hawaii.
Note (4): We only measure the bisector span (BS) for these observations.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d BJD Barycentric Julian Date (BJD-2400000)
13- 20 F8.5 mag dmag Differential magnitude in Flt (1)
22- 28 F7.5 mag e_dmag Uncertainty in Dmag
30- 37 F8.5 mag Omag ? Original magnitude in Flt (2)
39 A1 --- Flt [griz] Filter used (Sloan g, r, i, z)
41- 45 A5 --- Inst Instrument used (HS or GROND) (3)
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Note (1): The out-of-transit level has been subtracted. For the HATSouth
magnitudes (HS) have been detrended using the External Parameter
Decorrelation (EPD; Bakos et al., 2007ApJ...670..826B 2007ApJ...670..826B) and Trend Filtering
Algorithm (TFA; Kovacs et al., 2005MNRAS.356..557K 2005MNRAS.356..557K) procedures prior
to transit fitting. The detrending and potential blending may cause the
HATSouth transit to be up to 8% shallower than the true transit. Follow-up
light curves from GROND have been treated with EPDl simultaneous to the
transit fitting.
Note (2): Pre-EPD magnitudes are presented for the follow-up light curves.
Note (3): Instruments used to obtain data are defined as follows:
GROND = Gamma-Ray Burst Optical and Near-Infrared Detector on the ESO/MPG 2.2m
telescope.
HS = HATSouth instrument (HS-1 in Chile, HS-3 in Namibia, or HS-5 in
Australia).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 06-Oct-2014