SIMBAD references

2016ApJ...821...26B - Astrophys. J., 821, 26-26 (2016/April-2)

Dynamical constraints on the core mass of hot Jupiter HAT-P-13b.


Abstract (from CDS):

HAT-P-13b is a Jupiter-mass transiting exoplanet that has settled onto a stable, short-period, and mildly eccentric orbit as a consequence of the action of tidal dissipation and perturbations from a second, highly eccentric, outer companion. Owing to the special orbital configuration of the HAT-P-13 system, the magnitude of HAT-P-13b's eccentricity (eb) is in part dictated by its Love number ({k}{{2}\}), which is in turn a proxy for the degree of central mass concentration in its interior. Thus, the measurement of eb constrains {k}{{2}\} and allows us to place otherwise elusive constraints on the mass of HAT-P-13b's core (Mcore,b). In this study we derive new constraints on the value of eb by observing two secondary eclipses of HAT-P-13b with the Infrared Array Camera on board the Spitzer Space Telescope. We fit the measured secondary eclipse times simultaneously with radial velocity measurements and find that eb = 0.00700 ± 0.00100. We then use octupole-order secular perturbation theory to find the corresponding {k}{{2}\}={0.31}_{-0.05}^{+0.08}. Applying structural evolution models, we then find, with 68% confidence, that Mcore,b is less than 25 Earth masses (M⊕). The most likely value is Mcore,b = 11 M⊕, which is similar to the core mass theoretically required for runaway gas accretion. This is the tightest constraint to date on the core mass of a hot Jupiter. Additionally, we find that the measured secondary eclipse depths, which are in the 3.6 and 4.5 µm bands, best match atmospheric model predictions with a dayside temperature inversion and relatively efficient day-night circulation.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: data analysis - planets and satellites: atmospheres - planets and satellites: dynamical evolution and stability - planets and satellites: individual: HAT-P-13b - planets and satellites: interiors - techniques: photometric

Simbad objects: 14

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2016ApJ...821...26B and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact