2010ApJ...709.1219C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET13:45:39

2010ApJ...709.1219C - Astrophys. J., 709, 1219-1229 (2010/February-1)

Empirical constraints on the oblateness of an exoplanet.

CARTER J.A. and WINN J.N.

Abstract (from CDS):

We show that the gas giant exoplanet HD 189733b is less oblate than Saturn, based on Spitzer Space Telescope photometry of seven transits. The observable manifestations of oblateness would have been slight anomalies during the ingress and egress phases, as well as variations in the transit depth due to spin precession. Our nondetection of these effects gives the first empirical constraints on the shape of an exoplanet. The results are consistent with the theoretical expectation that the planetary rotation period and orbital period are synchronized, in which case the oblateness would be an order of magnitude smaller than our upper limits. Conversely, if HD 189733b is assumed to be in a synchronous, zero-obliquity state, then the data give an upper bound on the quadrupole moment of the planet (J2< 0.068 with 95% confidence) that is too weak to constrain the interior structure of the planet. An Appendix describes a fast algorithm for computing the transit light curve of an oblate planet, which was necessary for our analysis.

Abstract Copyright:

Journal keyword(s): methods: numerical - planetary systems - techniques: photometric

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 156 1
2 HD 80606b Pl 09 22 37.5769478105 +50 36 13.434928660           ~ 268 1
3 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K0V+M4V 702 1
4 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1036 1
5 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1428 1

    Equat.    Gal    SGal    Ecl

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2020.02.24-13:45:39

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