A Transiting Super-Earth in the Radius Valley and an Outer Planet Candidate Around HD 307842
Article
Hua, Xinyan, Wang, Sharon Xuesong, Teske, Johanna K., Gan, Tianjun, Shporer, Avi, Zhou, George, Stassun, Keivan G., Rabus, Markus, Howell, Steve B., Ziegler, Carl, Lissauer, Jack J., Winn, Joshua N., Jenkins, Jon M., Ting, Eric B., Collins, Karen A., Mann, Andrew W. and Zhu, Wei. 2023. "A Transiting Super-Earth in the Radius Valley and an Outer Planet Candidate Around HD 307842." The Astronomical Journal. 166 (1), pp. 1-22. https://doi.org/10.3847/1538-3881/acd751
| Article Title | A Transiting Super-Earth in the Radius Valley and an Outer Planet Candidate Around HD 307842 |
|---|---|
| ERA Journal ID | 1048 |
| Article Category | Article |
| Authors | Hua, Xinyan, Wang, Sharon Xuesong, Teske, Johanna K., Gan, Tianjun, Shporer, Avi, Zhou, George, Stassun, Keivan G., Rabus, Markus, Howell, Steve B., Ziegler, Carl, Lissauer, Jack J., Winn, Joshua N., Jenkins, Jon M., Ting, Eric B., Collins, Karen A., Mann, Andrew W. and Zhu, Wei |
| Journal Title | The Astronomical Journal |
| Journal Citation | 166 (1), pp. 1-22 |
| Article Number | 32 |
| Number of Pages | 22 |
| Year | 2023 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-6256 |
| 1538-3881 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/acd751 |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/acd751 |
| Abstract | We report the confirmation of a TESS-discovered transiting super-Earth planet orbiting a mid-G star, HD 307842 (TOI-784). The planet has a period of 2.8 days, and the radial velocity (RV) measurements constrain the mass to be 9.67 ? 0.82 + 0.83 M ? . We also report the discovery of an additional planet candidate on an outer orbit that is most likely nontransiting. The possible periods of the planet candidate are approximately 20-63 days, with the corresponding RV semiamplitudes expected to range from 3.2 to 5.4 m s?1 and minimum masses from 12.6 to 31.1 M ?. The radius of the transiting planet (planet b) is 1.93 ? 0.09 + 0.11 R ? , which results in a mean density of 7.4 ? 1.2 + 1.4 g cm ? 3 suggesting that TOI-784 b is likely to be a rocky planet though it has a comparable radius to a sub-Neptune. We found TOI-784 b is located at the lower edge of the so-called radius valley in the radius versus insolation plane, which is consistent with the photoevaporation or core-powered mass-loss prediction. The TESS data did not reveal any significant transit signal of the planet candidate, and our analysis shows that the orbital inclinations of planet b and the planet candidate are 88.60 ° ? 0.86 + 0.84 and ?88.°3-89.°2, respectively. More RV observations are needed to determine the period and mass of the second object, and search for additional planets in this system. |
| Keywords | Exoplanet astronomy (486); Radial velocity (1332); Transit photometry (1709); Super Earths (1655) |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Tsinghua University, China |
| Carnegie Institution for Science, United States | |
| Massachusetts Institute of Technology, United States | |
| Centre for Astrophysics | |
| Vanderbilt University, United States | |
| Catholic University of the Most Holy Conception (UCSC), Chile | |
| NASA Ames Research Center, United States | |
| Stephen F. Austin State University, United States | |
| Princeton University, United States | |
| Center for Astrophysics Harvard and Smithsonian, United States | |
| University of North Carolina, United States |
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