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A New Spectroscopic and Photometric Analysis of the Transiting Planet Systems TrES-3 and TrES-4

Sozzetti, Alessandro and Torres, Guillermo and Charbonneau, David and Winn, Joshua N. and Korzennik, Sylvain G. and Holman, Matthew J. and Latham, David W. and Laird, John B. and Fernandez, José and O'Donovan, Francis T. and Mandushev, Georgi and Dunham, Edward and Everett, Mark E. and Esquerdo, Gilbert A. and Rabus, Markus and Belmonte, Juan A. and Deeg, Hans J. and Brown, Timothy N. and Hidas, Márton G. and Baliber, Nairn (2009) A New Spectroscopic and Photometric Analysis of the Transiting Planet Systems TrES-3 and TrES-4. Astrophysical Journal, 691 (2). pp. 1145-1158. ISSN 0004-637X.

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We report new spectroscopic and photometric observations of the parent stars of the recently discovered transiting planets TrES-3 and TrES-4. A detailed abundance analysis based on high-resolution spectra yields [Fe/H] = –0.19 ± 0.08, T_(eff) = 5650 ± 75 K, and log g = 4.4 ± 0.1 for TrES-3, and [Fe/H] = +0.14 ± 0.09, T_(eff) = 6200 ± 75 K, and log g = 4.0 ± 0.1 for TrES-4. The accuracy of the effective temperatures is supported by a number of independent consistency checks. The spectroscopic orbital solution for TrES-3 is improved with our new radial velocity measurements of that system, as are the light-curve parameters for both systems based on newly acquired photometry for TrES-3 and a reanalysis of existing photometry for TrES-4. We have redetermined the stellar parameters taking advantage of the strong constraint provided by the light curves in the form of the normalized separation a/R_* (related to the stellar density) in conjunction with our new temperatures and metallicities. The masses and radii we derive are M_* = 0.928^(+0.028)_(–0.048) M_⊙, R_* = 0.829^(+0.015)_(–0.022) R_⊙, and M_* = 1.404^(+0.066)_(–0.134) M_⊙, R_* = 1.846^(+0.096)_(–0.087) R_⊙ for TrES-3 and TrES-4, respectively. With these revised stellar parameters, we obtain improved values for the planetary masses and radii. We find M_p = 1.910^(+0.075)_(–0.080) M_(Jup), R_p = 1.336^(+0.031)_(–0.036) R_(Jup) for TrES-3, and M_p = 0.925 ± 0.082 M_(Jup), R_p = 1.783^(+0.093)_(–0.086) R_(Jup) for TrES-4. We confirm TrES-4 as the planet with the largest radius among the currently known transiting hot Jupiters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Torres, Guillermo0000-0002-5286-0251
Charbonneau, David0000-0002-9003-484X
Winn, Joshua N.0000-0002-4265-047X
Holman, Matthew J.0000-0002-1139-4880
Latham, David W.0000-0001-9911-7388
O'Donovan, Francis T.0000-0002-4858-6106
Everett, Mark E.0000-0002-0885-7215
Esquerdo, Gilbert A.0000-0002-9789-5474
Additional Information:© 2009 The American Astronomical Society. Received 2008 August 31; accepted 2008 September 25; published 2009 February 2. AS gratefully acknowledges the Kepler mission for partial support under NASA Cooperative Agreement NCC 2-1390. G.T. acknowledges partial support for this work from NASA Origins grant NNG04LG89G. D.C. is supported in part by NASA Origins grant NNG05GJ29G. F.T.O.D. acknowledges partial support for this work provided through the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. J.B.L. gratefully acknowledges support from NSF grant AST-0307340. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This research has made use of NASA’s Astrophysics Data System Abstract Service and of the SIMBAD database, operated at CDS, Strasbourg, France.
Funding AgencyGrant Number
NASANCC 2-1390
W. M. Keck FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:stars: abundances; stars: fundamental parameters; stars: individual (TrES-3, TrES-4); planetary systems
Issue or Number:2
Record Number:CaltechAUTHORS:20090915-085812152
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Official Citation:A New Spectroscopic and Photometric Analysis of the Transiting Planet Systems TrES-3 and TrES-4 Alessandro Sozzetti, Guillermo Torres, David Charbonneau, Joshua N. Winn, Sylvain G. Korzennik, Matthew J. Holman, David W. Latham, John B. Laird, José Fernandez, Francis T. O'Donovan, Georgi Mandushev, Edward Dunham, Mark E. Everett, Gilbert A. Esquerdo, Markus Rabus, Juan A. Belmonte, Hans J. Deeg, Timothy N. Brown, Márton G. Hidas, and Nairn Baliber 2009 ApJ 691 1145-1158 doi: 10.1088/0004-637X/691/2/1145.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15848
Deposited By: Tony Diaz
Deposited On:16 Sep 2009 22:22
Last Modified:09 Mar 2020 13:19

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