2016A&A...588L...6M


Query : 2016A&A...588L...6M

2016A&A...588L...6M - Astronomy and Astrophysics, volume 588, L6-6 (2016/4-1)

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b.

MACIEJEWSKI G., DIMITROV D., FERNANDEZ M., SOTA A., NOWAK G., OHLERT J., NIKOLOV G., BUKOWIECKI L., HINSE T.C., PALLE E., TINGLEY B., KJURKCHIEVA D., LEE J.W. and LEE C.-U.

Abstract (from CDS):

Aims. Most hot Jupiters are expected to spiral in toward their host stars because the angular momentum of the orbital motion is transferred to the stellar spin. Their orbits can also precess as a result of planet-star interactions. Calculations show that both effects might be detected for the very-hot exoplanet WASP-12 b using the method of precise transit-timing over a time span of about 10yr.
Methods. We acquired new precise light curves for 29 transits of WASP-12 b, spannning four observing seasons from November 2012 to February 2016. New mid-transit times, together with those from the literature, were used to refine the transit ephemeris and analyze the timing residuals.
Results. We find that the transit times of WASP-12 b do not follow a linear ephemeris with a 5σ confidence level. They may be approximated with a quadratic ephemeris that gives a change rate in the orbital period of (-2.56±0.40)x10–2s/yr. The tidal quality parameter of the host star was found to be equal to 2.5x105, which is similar to theoretical predictions for Sun-like stars. We also considered a model in which the observed timing residuals are interpreted as a result of the apsidal precession. We find, however, that this model is statistically less probable than the orbital decay.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: individual: WASP-12 - planets and satellites: individual: WASP-12 b - planet-star interactions

VizieR on-line data: <Available at CDS (J/A+A/588/L6): w12new.dat w12rer.dat>

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 WASP-12 ** 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 282 2
2 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 699 1
3 WASP-43 PM* 10 19 38.0088913464 -09 48 22.605801336   13.4 12.4 12.08 11.10 K7V 125 1
4 OGLE-TR 113 SB* 10 52 24.2810533560 -61 26 48.845675976     16.08 15.41 14.42 K 116 1

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2023.01.27-13:20:47

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