NEAR-INFRARED THERMAL EMISSION FROM THE HOT JUPITER TrES-2b: GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE

Journal Article · Sat Jul 10 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/717/2/1084· OSTI ID:21455198

Croll, Bryce; Jayawardhana, Ray ^[1]; Albert, Loic ^[2]; Lafreniere, David ^[3]

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1. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada)
2. Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743 (United States)
3. Departement de physique, Universite de Montreal, C.P. 6128 Succ. Centre-Ville, Montreal, QC H3C 3J7 (Canada)

We present near-infrared Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-2b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope. We detect its thermal emission with an eclipse depth of 0.062{sup +0.013}{sub -0.011}% (5{sigma}). Our best-fit secondary eclipse is consistent with a circular orbit (a 3{sigma} upper limit on the eccentricity, e, and argument or periastron, {omega}, of |e cos {omega}| < 0.0090), in agreement with mid-infrared detections of the secondary eclipse of this planet. A secondary eclipse of this depth corresponds to a dayside Ks-band brightness temperature of T{sub B} = 1636{sup +79}{sub -88} K. Our thermal emission measurement, when combined with the thermal emission measurements using Spitzer/IRAC from O'Donovan and collaborators, suggests that this planet exhibits relatively efficient dayside to nightside redistribution of heat and a near isothermal dayside atmospheric temperature structure, whose spectrum is well approximated by a blackbody. It is unclear if the atmosphere of TrES-2b requires a temperature inversion; if it does it is likely due to chemical species other than TiO/VO as the atmosphere of TrES-2b is too cool to allow TiO/VO to remain in gaseous form. Our secondary eclipse has the smallest depth of any detected from the ground, at around 2 {mu}m, to date.

• OSTI ID: 21455198
• Journal Information: Astrophysical Journal, Vol. 717, Issue 2; Other Information: DOI: 10.1088/0004-637X/717/2/1084; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMBIENT TEMPERATURE
ECLIPSE
JUPITER PLANET
ORBITS
PHOTOMETRY
PLANETARY ATMOSPHERES
SPECTRA
STARS
TELESCOPES
TEMPERATURE INVERSIONS
TITANIUM OXIDES
VANADIUM OXIDES
ATMOSPHERES
CHALCOGENIDES
OXIDES
OXYGEN COMPOUNDS
PLANETS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS