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

Abstract

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, atmore » around 2 {mu}m, to date.« less

Authors:
;  [1];  [2];  [3]
  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)
Publication Date:
OSTI Identifier:
21455198
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 717; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/717/2/1084; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Croll, Bryce, Jayawardhana, Ray, Albert, Loic, Lafreniere, David, and Fortney, Jonathan J., E-mail: croll@astro.utoronto.c. NEAR-INFRARED THERMAL EMISSION FROM THE HOT JUPITER TrES-2b: GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE. United States: N. p., 2010. Web. doi:10.1088/0004-637X/717/2/1084.
Croll, Bryce, Jayawardhana, Ray, Albert, Loic, Lafreniere, David, & Fortney, Jonathan J., E-mail: croll@astro.utoronto.c. NEAR-INFRARED THERMAL EMISSION FROM THE HOT JUPITER TrES-2b: GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE. United States. https://doi.org/10.1088/0004-637X/717/2/1084
Croll, Bryce, Jayawardhana, Ray, Albert, Loic, Lafreniere, David, and Fortney, Jonathan J., E-mail: croll@astro.utoronto.c. 2010. "NEAR-INFRARED THERMAL EMISSION FROM THE HOT JUPITER TrES-2b: GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE". United States. https://doi.org/10.1088/0004-637X/717/2/1084.
@article{osti_21455198,
title = {NEAR-INFRARED THERMAL EMISSION FROM THE HOT JUPITER TrES-2b: GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE},
author = {Croll, Bryce and Jayawardhana, Ray and Albert, Loic and Lafreniere, David and Fortney, Jonathan J., E-mail: croll@astro.utoronto.c},
abstractNote = {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.},
doi = {10.1088/0004-637X/717/2/1084},
url = {https://www.osti.gov/biblio/21455198}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 717,
place = {United States},
year = {Sat Jul 10 00:00:00 EDT 2010},
month = {Sat Jul 10 00:00:00 EDT 2010}
}