Characterization of the Atmosphere of the Hot Jupiter HAT-P-32Ab and the M-dwarf Companion HAT-P-32B
O'Rourke, Joseph G.
Wright, Jason T.
Fulton, Benjamin J.
Law, Nicholas M.
Muirhead, Philip S.
American Astronomical Society / IoP Publishing
We report secondary eclipse photometry of the hot Jupiter HAT-P-32Ab, taken with Hale/Wide-field Infra-Red Camera (WIRC) in H and KS bands and with Spitzer/IRAC at 3.6 and 4.5 μm. We carried out adaptive optics imaging of the planet host star HAT-P-32A and its companion HAT-P-32B in the near-IR and the visible. We clearly resolve the two stars from each other and find a separation of 2.''923 ± 0.''004 and a position angle 110fdg64 ± 0fdg12. We measure the flux ratios of the binary in g'r'i'z' and H and KS bands, and determine T eff= 3565 ± 82 K for the companion star, corresponding to an M1.5 dwarf. We use PHOENIX stellar atmosphere models to correct the dilution of the secondary eclipse depths of the hot Jupiter due to the presence of the M1.5 companion. We also improve the secondary eclipse photometry by accounting for the non-classical, flux-dependent nonlinearity of the WIRC IR detector in the H band. We measure planet-to-star flux ratios of 0.090% ± 0.033%, 0.178% ± 0.057%, 0.364% ± 0.016%, and 0.438% ± 0.020% in the H, KS , 3.6 and 4.5 μm bands, respectively. We compare these with planetary atmospheric models, and find they prefer an atmosphere with a temperature inversion and inefficient heat redistribution. However, we also find that the data are equally well described by a blackbody model for the planet with T p = 2042 ± 50 K. Finally, we measure a secondary eclipse timing offset of 0.3 ± 1.3 minutes from the predicted mid-eclipse time, which constrains e = 0.0072 +0.0700}_-0.0064 when combined with radial
Center for Exoplanets and Habitable Worlds at the Pennsylvania State University
Pennsylvania State University
Eberly College of Science
Pennsylvania Space Grant Consortium
National Science Foundation - Graduate Research Fellowship Program
Natural Science and Engineering Research Council of Canada
California Institute of Technology - NASA Sagan Fellowship
Alfred P. Sloan Foundation
California Institute of Technology
Inter-University Centre for Astronomy and Astrophysics
National Science Foundation
Mt. Cuba Astronomical Foundation
Copyright © 2015 IOP Publishing
Vol. 796 (2), article 115