HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away
Article
Article Title | HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Badenas-Agusti, Mariona (Author), Gunther, Maximilian N. (Author), Daylan, Tansu (Author), Mikal-Evans, Thomas (Author), Vanderburg, Andrew (Author), Huang, Chelsea X. (Author), Matthews, Elisabeth (Author), Rackham, Benjamin V. (Author), Bieryla, Allyson (Author), Stassun, Keivan G. (Author), Kane, Stephen R. (Author), Shporer, Avi (Author), Fulton, Benjamin J. (Author), Hill, Michelle L. (Author), Nowak, Grzegorz (Author), Ribas, Ignasi (Author), Palle, Enric (Author), Jenkins, Jon M. (Author), Latham, David W. (Author), Seager, Sara (Author), Ricker, George R. (Author), Vanderspek, Roland K. (Author), Winn, Joshua N. (Author), Abril-Pla, Oriol (Author), Collins, Karen A. (Author), Serra, Pere Guerra (Author), Niraula, Prajwal (Author), Rustamkulov, Zafar (Author), Barclay, Thomas (Author), Crossfield, Ian J. M. (Author), Howell, Steve B. (Author), Ciardi, David R. (Author), Gonzales, Erica J. (Author), Schlieder, Joshua E. (Author), Caldwell, Douglas A. (Author), Fausnaugh, Michael (Author), McDermott, Scott (Author), Paegert, Martin (Author), Pepper, Joshua (Author), Rose, Mark E. (Author) and Twicken, Joseph D. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 160 (3), pp. 1-18 |
Article Number | 113 |
Number of Pages | 18 |
Year | 2020 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aba0b5 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aba0b5 |
Abstract | We present the discovery of three sub-Neptune-sized planets transiting the nearby and bright Sun-like star HD 191939 (TIC 269701147, TOI 1339), a K s = 7.18 mag G8 V dwarf at a distance of only 54 pc. We validate the planetary nature of the transit signals by combining 5 months of data from the Transiting Exoplanet Survey Satellite with follow-up ground-based photometry, archival optical images, radial velocities, and high angular resolution observations. The three sub-Neptunes have similar radii (Rb=3.42-0.11+0.11, Rc=3.23-0.11+0.11, and Rd=3.16-0.11+0.11,R⊕), and their orbits are consistent with a stable, circular, and coplanar architecture near mean-motion resonances of 1:3 and 3:4 (P b = 8.88, P c = 28.58, and P d = 38.35 days). The HD 191939 system is an excellent candidate for precise mass determinations of the planets with high-resolution spectroscopy due to the host star's brightness and low chromospheric activity. Moreover, the system's compact and near-resonant nature can provide an independent way to measure planetary masses via transit timing variations while also enabling dynamical and evolutionary studies. Finally, as a promising target for multiwavelength transmission spectroscopy of all three planets' atmospheres, HD 191939 can offer valuable insight into multiple sub-Neptunes born from a protoplanetary disk that may have resembled that of the early Sun. |
Keywords | Exoplanet systems (484); Exoplanets (498); Transit photometry (1709); Exoplanet detection methods (489); Astronomical techniques (1684); Astrophysics - Earth and Planetary Astrophysics |
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. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Massachusetts Institute of Technology, United States |
University of Texas at Austin, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Vanderbilt University, United States | |
University of California, United States | |
California Institute of Technology (Caltech), United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
Institute of Space Sciences, Spain | |
NASA Ames Research Center, United States | |
Princeton University, United States | |
Pompeu Fabra University, Spain | |
Albanya Observatory, Spain | |
Johns Hopkins University, United States | |
NASA Goddard Space Flight Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Proto-Logic Consulting, United States | |
Lehigh University, United States |
https://research.usq.edu.au/item/q726z/hd-191939-three-sub-neptunes-transiting-a-sun-like-star-only-54-pc-away
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