TY - JOUR
T1 - Characterization of the atmosphere of the hot Jupiter HAT-P-32Ab and the M-Dwarf companion HAT-P-32B
AU - Zhao, Ming
AU - O'Rourke, Joseph G.
AU - Wright, Jason T.
AU - Knutson, Heather A.
AU - Burrows, Adam
AU - Fortney, Johnathan
AU - Ngo, Henry
AU - Fulton, Benjamin J.
AU - Baranec, Christoph
AU - Riddle, Reed
AU - Law, Nicholas M.
AU - Muirhead, Philip S.
AU - Hinkley, Sasha
AU - Showman, Adam P.
AU - Curtis, Jason
AU - Burruss, Rick
N1 - Publisher Copyright:
© 2014. The American Astronomical Society. All rights reserved..
PY - 2014/12/1
Y1 - 2014/12/1
N2 - 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 110.°64 ± 0.°12. 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 when combined with radial velocity data and is more consistent with a circular orbit.
AB - 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 110.°64 ± 0.°12. 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 when combined with radial velocity data and is more consistent with a circular orbit.
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U2 - 10.1088/0004-637X/796/2/115
DO - 10.1088/0004-637X/796/2/115
M3 - Article
AN - SCOPUS:84911367659
SN - 0004-637X
VL - 796
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 115
ER -