The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core

Details The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core

2005-06-30

arxiv.org/abs/astro-ph/0507009v1

Astrophys.J.633:465-473,2005

Astronomy and Astrophysics

Astrophysics

25 pages, 5 figures, accepted by the Astrophysical Journal

Scientific paper

10.1086/449306

Doppler measurements from Subaru and Keck have revealed radial velocity variations in the V=8.15, G0IV star HD 149026 consistent with a Saturn-Mass planet in a 2.8766 day orbit. Photometric observations at Fairborn Observatory have detected three complete transit events with depths of 0.003 mag at the predicted times of conjunction. HD 149026 is now the second brightest star with a transiting extrasolar planet. The mass of the star, based on interpolation of stellar evolutionary models, is 1.3 +/- 0.1 solar masses; together with the Doppler amplitude, K=43.3 m s^-1, we derive a planet mass Msin(i)=0.36 Mjup, and orbital radius of 0.042 AU. HD 149026 is chromospherically inactive and metal-rich with spectroscopically derived [Fe/H]=+0.36, Teff=6147 K, log g=4.26 and vsin(i)=6.0 km s^-1. Based on Teff and the stellar luminosity of 2.72 Lsun, we derive a stellar radius of 1.45 Rsun. Modeling of the three photometric transits provides an orbital inclination of 85.3 +/- 1.0 degrees and (including the uncertainty in the stellar radius) a planet radius of 0.725 +/- 0.05 Rjup. Models for this planet mass and radius suggest the presence of a ~67 Mearth core composed of elements heavier than hydrogen and helium. This substantial planet core would be difficult to construct by gravitational instability.

Affiliated with

Also associated with

No associations

Rating

The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-410550