HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star
Article
Heidari, N., Boisse, I., Orell-Miquel, J., Hebrard, G., Acuna, L., Hara, N. C., Lillo-Box, J., Eastman, J. D., Arnold, L., Astudillo-Defru, N., Adibekyan, V., Bieryla, A., Bonfils, X., Bouchy, F., Barclay, T., Brasseur, C. E., Borgniet, S., Bourrier, V., Buchhave, L., ..., Weiss, L. M.. 2022. "HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star." Astronomy and Astrophysics: a European journal. 658. https://doi.org/10.1051/0004-6361/202141429
| Article Title | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
|---|---|
| ERA Journal ID | 1050 |
| Article Category | Article |
| Authors | Heidari, N., Boisse, I., Orell-Miquel, J., Hebrard, G., Acuna, L., Hara, N. C., Lillo-Box, J., Eastman, J. D., Arnold, L., Astudillo-Defru, N., Adibekyan, V., Bieryla, A., Bonfils, X., Bouchy, F., Barclay, T., Brasseur, C. E., Borgniet, S., Bourrier, V., Buchhave, L., Behmard, A., Beard, C., Batalha, Natalie M., Courcol, B., Cortés-Zuleta, P., Collins, K., Carmona, A., Crossfield, I., Chontos, A., Delfosse, X., Dalal, S., Deleuil, M., Demangeon, O. D. S., Diaz, R. F., Dumusque, X., Daylan, T., Dragomir, D., Delgado-Mena, E., Dressing, C., Dai, F., Dalba, P. A., Ehrenreich, D., Forveille, T., Fulton, B., Fetherolf, T., Gaisne, G., Giacalone, S., Riazi, N., Hoyer, S., Hobson, M. J., Howard, A., Huber, D., Hill, M., Hirsch, L., Isaacson (Student), H., Jenkins, J., Kane, S.R., Kiefer, F., Luque, R., Latham, D., Lubin, J., Lopez, T., Mousis, O., Moutou, C., Montagnier, G., Mignon, L., Mayo, A., Mocnik, T., Akana Murphy, J., Palle, E., Pepe, F., Petigura, E. A., Rey, J., Ricker, G., Robertson, P., Roy, A., Rubenzahl, R. A., Rosenthal, L. J., Santerne, A., Santos, N. C., Sousa, S., Stassun, K. G., Stalport, M., Scarsdale, N., Strom, P., Seager, S., Segransan, D., Tenenbaum, P., Tronsgaard, R., Udry, S., Vanderspek, R., Vakili, F., Winn, J. and Weiss, L. M. |
| Journal Title | Astronomy and Astrophysics: a European journal |
| Journal Citation | 658 |
| Article Number | A176 |
| Number of Pages | 17 |
| Year | 2022 |
| Publisher | EDP Sciences |
| Place of Publication | France |
| ISSN | 0004-6361 |
| 1432-0746 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202141429 |
| Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2022/02/aa41429-21/aa41429-21.html |
| Abstract | We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5−0.7+0.8 g cm−3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position. |
| Keywords | planets and satellites: detection; stars: activity; planets and satellites: individual: HD 207897; planets and satellites: individual: TOI-1611; planets and satellites: individual: TIC ID 264678534 |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
| Byline Affiliations | Shahid Beheshti University, Iran |
| Cote d'Azur Observatory, France | |
| Aix-Marseille University, France | |
| Institute of Astrophysics of the Canary Islands, Spain | |
| University of La Laguna, Spain | |
| Haute-Provence Observatory, France | |
| Pierre and Marie Curie University, France | |
| University of Geneva, Switzerland | |
| Astrobiology Center, Spain | |
| Center for Astrophysics Harvard and Smithsonian, United States | |
| Canada-France-Hawaii Telescope, United States | |
| Catholic University of the Most Holy Conception (UCSC), Chile | |
| University of Porto, Portugal | |
| Academic Registrar's Office | |
| Centre for Astrophysics | |
| Grenoble Alpes University, France | |
| NASA Goddard Space Flight Center, United States | |
| University of Maryland, United States | |
| Space Telescope Science Institute, United States | |
| Paris Observatory, France | |
| Technical University of Denmark, Denmark | |
| California Institute of Technology (Caltech), United States | |
| University of California, United States | |
| University of California Santa Cruz, United States | |
| University of Kansas, United States | |
| University of Hawaii, United States | |
| National University of General San Martin, Argentina | |
| Massachusetts Institute of Technology, United States | |
| University of New Mexico, United States | |
| University of California Berkeley, United States | |
| California Institute of Technology (Caltech), United States | |
| NASA Exoplanet Science Institute, United States | |
| Millennium Institute for Astrophysics, Chile | |
| Pontifical Catholic University of Chile, Chile | |
| Stanford University, United States | |
| NASA Ames Research Center, United States | |
| Gemini Observatory, United States | |
| University of California Los Angeles, United States | |
| Las Campanas Observatory, Chile | |
| Johns Hopkins University, United States | |
| Vanderbilt University, United States | |
| University of Southern Queensland | |
| Geneva Observatory, Switzerland | |
| University of Warwick, United Kingdom | |
| Princeton University, United States |
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