J/AJ/158/113 Kepler-13AB aperture photometry (Howell+, 2019)
High-resolution imaging transit photometry of Kepler-13AB.
Howell S.B., Scott N.J., Matson R.A., Horch E.P., Stephens A.
<Astron. J., 158, 113-113 (2019)>
=2019AJ....158..113H 2019AJ....158..113H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Photometry ; Optical ; Exoplanets
Keywords: binaries: close - galaxies: photometry -
instrumentation: high angular resolution - planetary systems -
techniques: image processing
Abstract:
Using the high-resolution imaging instrument, 'Alopeke, at the Gemini-N
telescope, we obtained simultaneous two-channel time-series observations
of the binary exoplanet host star Kepler13-AB. Our optical observations
were obtained during a transit event of the exoplanet Kepler-13b and
light curves were produced using both speckle interferometric and aperture
photometry techniques. Both techniques confirm that the transiting object
orbits the star Kepler-13A while different transit depths are seen across
the optical wavelength range, being ∼2 times deeper in the blue. These
measurements, as well as mass determinations in the literature, are
consistent with Kepler-13b being a highly irradiated gas giant with a
bloated atmosphere. Our observations highlight the ability of
high-resolution speckle imaging to not only assess binarity in exoplanet
host stars but robustly determine which of the stars the transiting object
actually orbits.
Description:
We observed Kepler-13 on 2018 August 13/14 UT at the Gemini-N telescope
using the high-resolution imaging instrument 'Alopeke. 'Alopeke is a
dual-channel imager using two electron-multiplying CCDs (EMCCDs) as
the detectors and containing filter wheels providing bandpass limited
observations (see Scott et al. 2018PASP..130e4502S 2018PASP..130e4502S and 'Alopeke web pages
http://www.gemini.edu/sciops/instruments/alopeke/). The observations
of Kepler-13 were planned to provide two types of time-series data at
once: speckle interferometric observations (e.g., Horch et al.
2012AJ....144..165H 2012AJ....144..165H) and traditional time-series transit photometry
(Howell et al. 1988AJ.....95..247H 1988AJ.....95..247H). Our observations began at 8:42 UT
on 2018 August 13/14 and lasted until 12:49 UT. The Kepler-13AB
observations, spanning 4 hr in time, ranged in airmass from 1.1 (start)
to 2.0 (end). We made all observations in the blue channel using the
562/54 nm filter and in the red channel using the 832/40 nm filter.
Objects:
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RA (ICRS) DE Designation(s)
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19 07 53.10 +46 52 06.0 Kepler-13 = BD+46 2629
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 24 104 Kepler-13AB aperture photometry
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See also:
J/A+A/544/L12 : Velocitometry transit of KOI-13 (Santerne+, 2012)
J/ApJ/788/92 : The hot Jupiter Kepler-13Ab planet's occultation
(Shporer+, 2014)
J/ApJS/210/19 : Kepler planetary candidates. IV. 22 months (Burke+, 2014)
J/AJ/153/71 : Kepler follow-up observation program. I. Imaging
(Furlan+, 2017)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 nm Band [562/832] Waveband
5- 9 F5.2 h Time [8.88/12.58]? Mean UT time
11- 17 F7.4 mag Dmag [-0.2/-0.1224]? Differential magnitude in Band
19- 24 F6.4 mag e_Dmag [0.0028/0.0065]? Standard error in Dmag
σ/sqrt(N)
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 21-Oct-2019