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Program Information for 2015B-0115


PI: Joel Hartman, Princeton U., jhartman@astro.princeton.edu
Address: Astrophysical Sciences, 4 Ivy Lane, Princeton, NJ 08544 USA

CoI: Gaspar Bakos, Princeton U.
CoI: Xu Huang, Princeton U.

Title: Confirming the Inflated Size of a Transiting Super-Jupiter with WHIRC

Abstract: We have recently discovered a transiting planet, called HAT-P-56b, and confirmed with {\em K2}.0 long-cadence data, which has a mass of .23\pm0.21$\,M$_J$ and an unusually large radius of 1.56$^{+0.33}_{- 0.13}$\,R$_$. While other planets with radii larger than HAT-P-56b have been discovered, few are as massive as this planet. One source of uncertainty in our measurement of the radius of HAT-P-56b is limb darkening. Because this planet is on a near-grazing orbit, and the stellar limb darkening laws are most prone to systematic errors near the stellar limb, it is possible that the radius of this planet has been overestimated. Here we propose to observe a single primary transit of HAT-P-56b in $K_$-band with WHIRC. Limb darkening is negligible in this band-pass permitting an accurate determination of the planet impact parameter and radius. These data will allow us to confirm whether a super-Jupiter can be highly inflated. They will also serve as a test- case for characterizing the time-series photometric precision of WHIRC on bright stars, with the future goal of measuring the NIR emission from transiting planets using this instrument.

Program Type: Standard/NASA WIYN

Scheduled Nights:
Run 1 (2015B):  WIYN/WHIRC -- 4n on Oct 27 2015, Nov 24 - Nov 25 2015, Dec 05 2015


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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