HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field

Details HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field

2008-03-05

arxiv.org/abs/0803.0746v1

Astrophys.J.680:1450-1456,2008

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ, 8 pages, 2 figures

Scientific paper

10.1086/588010

We report on the latest discovery of the HATNet project; a very hot giant planet orbiting a bright (V = 10.5) star with a small semi-major axis of a = 0.0377 +/- 0.0005 AU. Ephemeris for the system is P = 2.2047299 +/- 0.0000040 days, mid-transit time E = 2,453,790.2593 +/- 0.0010 (BJD). Based on the available spectroscopic data on the host star and photometry of the system, the planet has a mass of Mp = 1.78+/-^{0.08}_{0.05} MJup and radius of Rp = 1.36+/-^{0.20}_{0.09} RJup. The parent star is a slightly evolved F6 star with M = 1.47+/-^{0.08}_{-0.05} Msun,R = 1.84+/-^{0.23}_{0.11} Rsun, Teff = 6350 +/- 80 K, and metallicity [Fe/H] = +0.26 +/- 0.08. The relatively hot and large host star, combined with the close orbit of the planet, yield a very high planetary irradiance of (4.71+/-^{1.44}_{0.05}) 10^9 erg cm^{-2}s^{-1}, which places the planet near the top of the pM class of irradiated planets as defined by Fortney et al. (2007). If as predicted by Fortney et al. (2007) the planet re-radiates its absorbed energy before distributing it to the night side, the day-side temperature should be about (2730+/-^{150}_{100}) K. Because the host star is quite bright, measurement of the secondary eclipse should be feasible for ground-based telescopes, providing a good opportunity to compare the predictions of current hot Jupiter atmospheric models with the observations. Moreover, the host star falls in the field of the upcoming Kepler mission; hence extensive space-borne follow-up, including not only primary transit and secondary eclipse observations but also asteroseismology, will be possible.

Affiliated with

Also associated with

No associations

Rating

HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field 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 HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-13180