J/AJ/150/85 Photometry and spectroscopy of HAT-P-56 (Huang+, 2015)
HAT-P-56b: an inflated massive hot Jupiter transiting a bright F star followed
up with K2 campaign 0 observations.
Huang C.X., Hartman J.D., Bakos G.A., Penev K., Bhatti W., Bieryla A.,
de Val-Borro M., Latham D.W., Buchhave L.A., Csubry Z., Kovacs G., Beky B.,
Falco E., Berlind P., Calkins M.L., Esquerdo G.A., Lazar J., Papp I.,
Sari P.
<Astron. J., 150, 85 (2015)>
=2015AJ....150...85H 2015AJ....150...85H (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Stars, double and multiple ; Photometry ;
Radial velocities ; Stars, F-type ; Stars, dwarfs
Keywords: planetary systems - stars: individual: HAT-P-56 -
techniques: photometric - techniques: spectroscopic
Abstract:
We report the discovery of HAT-P-56b by the HATNet survey, an inflated
hot Jupiter transiting a bright F-type star in Field 0 of NASA's K2
mission. We combine ground-based discovery and follow-up light curves
with high precision photometry from K2, as well as ground-based radial
velocities from the Tillinghast Reflector Echelle Spectrograph on the
Fred Lawrence Whipple Observatory 1.5m telescope to determine the
physical properties of this system. HAT-P-56b has a mass of 2.18MJ,
radius of 1.47RJ, and transits its host star on a near-grazing orbit
with a period of 2.7908day. The radius of HAT-P-56b is among the
largest known for a planet with MP>2MJ. The host star has a V-band
magnitude of 10.9, mass of 1.30M☉, and radius of 1.43R☉.
The periodogram of the K2 light curve suggests that the star is a
γ Dor variable. HAT-P-56b is an example of a ground-based
discovery of a transiting planet, where space-based observations
greatly improve the confidence in the confirmation of its planetary
nature, and also improve the accuracy of the planetary parameters.
Description:
The star HAT-P-56 was observed by the HATNet wide-field photometric
instruments between the nights of UT 2011 October 14 and UT 2012 May
3. A total of 6509 observations of a 10.6°*10.6° field
centered at RA=06h24m, Dec=+30° were made with the HAT-6
telescope in Arizona, and 4194 observations of this same field were
made with the HAT-9 telescope in Hawaii. We used a Sloan r filter and
an exposure time of 180s.
Initial photometric follow-up observations of HAT-P-56 were carried
out with KeplerCam on the Fred Lawrence Whipple Observatory (FLWO)
1.2m telescope. We observed a single transit ingress on the night of
UT 2013 March 25 using an i-band filter and an exposure time of 10s.
We carried out spectroscopic observations of HAT-P-56 between UT 2012
October 31 and UT 2014 November 25 using the Tillinghast Reflector
Echelle Spectrograph (TRES) on the 1.5m Tillinghast Reflector at FLWO.
A single Apache Point Observatory (APO) 3.5m telescope/ARC Echelle
Spectrograph (ARCES) spectrum of HAT-P-56 was also obtained for
reconnaissance on UT 2012 November 7.
Encouraged by the HATNet, FLWO 1.2m, and TRES observations, we
proposed HAT-P-56 as a target for the K2 Campaign 0 through the Kepler
Guest Observing Program. The observations are in Kepler Long Cadence
mode (∼30 minute exposures) with a stamp size of 27*27 pixels on
Kepler CCD Module 10, Channel 29, and were carried out between
BJD2456728.5282 and BJD2456805.1883 (UT 2014 March 8 to UT 2014 May
27). There are two data gaps during the observation, from
BJD2456732.4309 to BJD2456735.6386, and from BJD2456744.1180 to
BJD2456767.5941.
Objects:
-----------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
-----------------------------------------------------------------
06 43 23.53 +27 15 08.2 HAT-P-56 = HD 262389 (P=2.7908327)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 11860 Differential photometry of HAT-P-56
table2.dat 43 18 Relative radial velocities, and bisector span
measurements of HAT-P-56
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See also:
J/AJ/149/149 : Photometry and spectroscopy of HAT-P-54 (Bakos+, 2015)
J/AJ/147/84 : Photometry and spectroscopy of HAT-P-49 (Bieryla+, 2014)
J/MNRAS/429/2001 : New transiting planet candidates from Kepler (Huang+, 2013)
J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)
J/ApJ/734/109 : Follow-up photometry of HAT-P-27 (Beky+, 2011)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
http://hatnet.org/ : HATNet website
Byte-by-byte Description of file: table1.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) (1)
13- 20 F8.5 mag Dmag [-0.033/1.001] Differential magnitude in Filter (2)
22- 28 F7.5 mag e_Dmag [0.0001/0.015] Uncertainty in Dmag
30- 36 F7.5 mag omag [0.98/9.8]? Raw photometry value in Filter (3)
38- 40 A3 --- Flt Filter used (Kep, r, i) (4)
42- 50 A9 --- Inst Instrument used (HATNet, K2, Keplercam) (5)
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Note (1): Calculated directly from UTC, without correction for leap seconds for
HATNet and KeplerCam.
Note (2): For HATNet and KeplerCam this is in units of magnitudes, for K2 it is
in relative flux. The out-of-transit level has been subtracted. These
values have been corrected for trends simultaneously with the transit fit
for the follow-up data. For HATNet trends were filtered before fitting for
the transit.
Note (3): After correction using comparison stars, but without additional
trend-filtering. For KeplerCam this is in magnitudes, for K2 it is in
relative flux. We do not report this value for HATNet.
Note (4): The filters used in the observation are defined as below:
Kep = Kepler (for K2 photometric follow-up);
i = i-band filter (for photometric follow-up with KeplerCam);
r = Sloan r filter (for the photometric detection).
Note (5): The instruments used in the observation are defined as below:
HATNet = HAT-6 telescope in Arizona or HAT-9 telescope in Hawaii;
K2 = K2 Campaign 0;
Keplercam = KeplerCam on the Fred Lawrence Whipple Observatory (FLWO) 1.2m
telescope.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 d BJD Barycentric Julian Date (BJD-2456900)
10- 13 I4 m/s RV [-649/68] Radial velocity
15- 17 I3 m/s e_RV [54/153] The 1σ error in RV
19- 25 F7.2 m/s BS [-161.5/150.1] Bissector Span
27- 32 F6.2 m/s e_BS [34.1/111] The 1σ error in RV
34- 38 F5.3 --- Phase [0/1] Phase
40- 43 A4 --- Inst Instrument (TRES) (1)
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Note (1): TRES=Tillinghast Reflector Echelle Spectrograph on the Fred Lawrence
Whipple Observatory (FLWO) 1.5m telescope.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 15-Oct-2015