The GJ436 system: directly determined astrophysical parameters of an M dwarf and implications for the transiting hot Neptune
Article
Article Title | The GJ436 system: directly determined astrophysical parameters of an M dwarf and implications for the transiting hot Neptune |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | von Braun, Kaspar (Author), Boyajian, Tabetha S. (Author), Kane, Stephen R. (Author), Hebb, Leslie (Author), van Belle, Gerard T. (Author), Farrington, Chris (Author), Ciardi, David R. (Author), Knutson, Heather A. (Author), ten Brummelaar, Theo A. (Author), Lopez-Morales, Mercedes (Author), McAlister, Harold A. (Author), Schaefer, Gail (Author), Ridgway, Stephen (Author), Cameron, Andrew Collier (Author), Goldfinger, P. J. (Author), Turner, Nils H. (Author), Sturmann, Laszlo (Author) and Sturmann, Judit (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 753 (2), pp. 171-179 |
Article Number | 171 |
Number of Pages | 9 |
Year | 2012 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/753/2/171 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-637X/753/2/171 |
Abstract | The late-type dwarf GJ436 is known to host a transiting Neptune-mass planet in a 2.6day orbit. We present results of our interferometric measurements to directly determine the stellar diameter (R ⊙ = 0.455 ± 0.018 R ⊙) and effective temperature (T EFF = 3416 ± 54 K). We combine our stellar parameters with literature time-series data, which allows us to calculate physical and orbital system parameters, including GJ436's stellar mass (M ⊙ = 0.507+0.071 - 0.062 M ⊙), stellar density (ρ * = 5.37+0.30 - 0.27 ρ ⊙), planetary radius (Rp = 0.369+0.015 - 0.015 R Jupiter), and planetary mass (Mp = 0.078+0.007 - 0.008 M Jupiter), implying a mean planetary density of ρp = 1.55+0.12 - 0.10 ρJupiter. These values are generally in good agreement with previous literature estimates based on assumed stellar mass and photometric light curve fitting. Finally, we examine the expected phase curves of the hot Neptune GJ436b, based on various assumptions concerning the efficiency of energy redistribution in the planetary atmosphere, and find that it could be constrained with Spitzer monitoring observations. |
Keywords | infrared stars; planetary systems;fundamental parameters (radii, temperatures, luminosities); individual stars (GJ 436); late-type stars; interferometric techniques; |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | California Institute of Technology (Caltech), United States |
Georgia State University, United States | |
Vanderbilt University, United States | |
Lowell Observatory, United States | |
Mount Wilson Observatory, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Carnegie Institution of Washington, United States | |
National Optical Astronomy Observatory, United States | |
University of St Andrews, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4323/the-gj436-system-directly-determined-astrophysical-parameters-of-an-m-dwarf-and-implications-for-the-transiting-hot-neptune
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