Title

A SPITZER FIVE-BAND ANALYSIS OF THE JUPITER-SIZED PLANET TrES-1

Authors

Authors

P. Cubillos; J. Harrington; N. Madhusudhan; A. S. D. Foster; N. B. Lust; R. A. Hardy;M. O. Bowman

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Astrophys. J.

Keywords

planetary systems; stars: individual (TrES-1); techniques: photometric; TRANSITING EXTRASOLAR PLANETS; INFRARED ARRAY CAMERA; LIGHT-CURVE; PROJECT; EXOPLANET GJ 436B; THERMAL EMISSION; MODEL SELECTION; SPACE-TELESCOPE; HD 209458B; ATMOSPHERES; INVERSION; Astronomy & Astrophysics

Abstract

With an equilibrium temperature of 1200 K, TrES-1 is one of the coolest hot Jupiters observed by Spitzer. It was also the first planet discovered by any transit survey and one of the first exoplanets from which thermal emission was directly observed. We analyzed all Spitzer eclipse and transit data for TrES-1 and obtained its eclipse depths and brightness temperatures in the 3.6 mu m (0.083% +/- 0.024%, 1270 +/- 110 K), 4.5 mu m (0.094% +/- 0.024%, 1126 +/- 90 K), 5.8 mu m (0.162% +/- 0.042%, 1205 +/- 130 K), 8.0 mu m (0.213% +/- 0.042%, 1190 +/- 130 K), and 16 mu m (0.33% +/- 0.12%, 1270 +/- 310 K) bands. The eclipse depths can be explained, within 1s errors, by a standard atmospheric model with solar abundance composition in chemical equilibrium, with or without a thermal inversion. The combined analysis of the transit, eclipse, and radial-velocity ephemerides gives an eccentricity of e = 0.033(-0.031)(+0.015), consistent with a circular orbit. Since TrES-1's eclipses have low signal-to-noise ratios, we implemented optimal photometry and differential-evolution Markov Chain Monte Carlo (MCMC) algorithms in our Photometry for Orbits, Eclipses, and Transits pipeline. Benefits include higher photometric precision and similar to 10 times faster MCMC convergence, with better exploration of the phase space and no manual parameter tuning.

Journal Title

Astrophysical Journal

Volume

797

Issue/Number

1

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

16

WOS Identifier

WOS:000345915000042

ISSN

0004-637X

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