J/AcA/68/371 WASP and KELT planet transits (Maciejewski+, 2018)
Planet-star interactions with precise transit timing.
I. The refined orbital decay rate for WASP-12 b and initial constraints for
HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b.
Maciejewski G., Fernandez M., Aceituno F., Martin-Ruiz S., Ohlert J.,
Dimitrov D., Szyszka K., von Essen C., Mugrauer M., Bischoff R.,
Michel K.-U., Mallonn M., Stangret M., Mozdzierski D.
<Acta Astron. 68, 371 (2018)>
=2018AcA....68..371M 2018AcA....68..371M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: planet-star interactions - stars: individual:
HAT-P-23, KELT-1, KELT-16, WASP-12, WASP-33, WASP-103 -
planets and satellites: individual:
HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-12 b, WASP-33 b, WASP-103 b
Abstract:
Theoretical calculations and some indirect observations show that
massive exoplanets on tight orbits must decay due to tidal dissipation
within their host stars. This orbital evolution could be
observationally accessible through precise transit timing over a
course of decades. The rate of planetary in-spiraling may not only
help us to understand some aspects of evolution of planetary systems,
but also can be used as a probe of the stellar internal structure. In
this paper we present results of transit timing campaigns organized
for a carefully selected sample of the Northern hemisphere hot
Jupiter-like planets which were found to be the best candidates for
detecting planet-star tidal interactions. Among them, there is the
WASP-12 system which is the best candidate for possessing an
in-falling giant exoplanet. Our new observations support the scenario
of orbital decay of WASP-12 b and allow us to refine its rate. The
derived tidal quality parameter of the host star
Q'*=(1.82±0.32)x105 is in agreement with theoretical predictions
for subgiant stars. For the remaining systems - HAT-P-23, KELT-1,
KELT-16, WASP-33, and WASP-103 - our transit timing data reveal no
deviations from the constant-period models, hence constraints on the
individual rates of orbital decay were placed. The tidal quality
parameters of host stars in at least four systems - HAT-P-23, KELT-1,
WASP-33, and WASP-103 - were found to be greater than the value
reported for WASP-12. This is in line with the finding that those
hosts are main sequence stars, for which efficiency of tidal
dissipation is predicted to be relatively weak.
Description:
New light curves for transits of 6 exoplanets observed between 2016
and 2018 are given together with transit timing data. Data were
collected with 0.6-2.0m telescopes. Details on observations and data
processing are given in the source paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 57 6 List of studied stars
h23lcs.dat 41 5720 New light curves for transits of HAT-P-23 b
k01lcs.dat 42 6231 New light curves for transits of KELT-1 b
k16lcs.dat 42 4149 New light curves for transits of KELT-16 b
w12lcs.dat 42 10250 New light curves for transits of WASP-12 b
w33lcs.dat 42 10815 New light curves for transits of WASP-33 b
w103lcs.dat 41 6399 New light curves for transits of WASP-103 b
h23tt.dat 34 38 Transit times for HAT-P-23 b
k01tt.dat 34 23 Transit times for KELT-1 b
k16tt.dat 34 22 Transit times for KELT-16 b
w12tt.dat 34 20 New transit times for WASP-12 b
w33tt.dat 34 29 Transit times for WASP-33 b
w103tt.dat 34 32 Transit times for WASP-103 b
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
12- 13 I2 h RAh Simbad right ascension (J2000)
15- 16 I2 min RAm Simbad right ascension (J2000)
18- 22 F5.2 s RAs Simbad right ascension (J2000)
24 A1 --- DE- Simbad declination sign (J2000)
25- 26 I2 deg DEd Simbad declination (J2000)
28- 29 I2 arcmin DEm Simbad declination (J2000)
31- 34 F4.1 arcsec DEs Simbad declination (J2000)
36- 46 A11 --- LCName Name of the file with light curves
48- 57 A10 --- TTName Name of the file with mid-transit times
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Byte-by-byte Description of file: *lcs.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian date
(BJD-2450000 in Barycentric Dynamical Time)
13- 20 F8.6 --- Flux Normalized flux
22- 29 F8.6 --- e_Flux Flux error
31- 36 A6 --- TelCode Telescope code
38- 42 A5 --- Filter Filter name (B, V, R, VR, BB500 or none)
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Byte-by-byte Description of file: *tt.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- E Transit number from initial epoch
5- 16 F12.6 d Tmid Mid-transit time
(BJD-2450000 in Barycentric Dynamical Time)
17- 25 F9.6 d E_Tmid Mid-transit time positive uncertainty
26- 34 F9.6 d e_Tmid Mid-transit time negative uncertainty
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Acknowledgements:
Gracjan Maciejewski, gmac(at)umk.pl
(End) G. Maciejewski [N. Copernicus Univ., Poland], P. Vannier [CDS] 11-Jan-2019