HD152843 b & c: the masses and orbital periods of a sub-Neptune and a superpuff Neptune
Article
Nicholson, B. A., Aigrain, S., Eisner, N. L., Cretignier, M., Barragan, O., Kaye, L., Taylor, J., Owen, J., Mortier, A., Affer, L., Boschin, W., Buchhave, L. A., Collier Cameron, A., Damasso, M., Di Fabrizio, L., DiTomasso, V., Dumusque, X., Ghedina, A., Latham, D. W., ..., Sozzetti, A.. 2024. "HD152843 b & c: the masses and orbital periods of a sub-Neptune and a superpuff Neptune." Monthly Notices of the Royal Astronomical Society. 532 (4), pp. 4632-4644. https://doi.org/10.1093/mnras/stae1821
| Article Title | HD152843 b & c: the masses and orbital periods of a sub-Neptune and a superpuff Neptune |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | Nicholson, B. A., Aigrain, S., Eisner, N. L., Cretignier, M., Barragan, O., Kaye, L., Taylor, J., Owen, J., Mortier, A., Affer, L., Boschin, W., Buchhave, L. A., Collier Cameron, A., Damasso, M., Di Fabrizio, L., DiTomasso, V., Dumusque, X., Ghedina, A., Latham, D. W., Lopez-Morales, M., Lorenzi, V., Martinez Fiorenzano, A., Molinari, E., Pedani, M., Pinamonti, M., Rice, K. and Sozzetti, A. |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 532 (4), pp. 4632-4644 |
| Number of Pages | 13 |
| Year | 2024 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stae1821 |
| Web Address (URL) | https://academic.oup.com/mnras/article/532/4/4632/7721629 |
| Abstract | We present the characterization of the two transiting planets around HD 152843 (TOI 2319, TIC 349488688) using an intensive campaign of HARPS-N radial velocities, and two sectors of TESS data. These data reveal a unique and fascinating system: HD 152843 b and c have near equal masses of around 9 M but differing radii of 3.05 ± 0.11 R and 5.94+?001618 R, respectively, and orbital periods of 11.62071+?090001066e?05 and 19.502104+?87.54ee??0505 d. This indicates that HD 152843 c is in the lowest fifth-percentile in density of the known exoplanet population, and has the longest orbital period among these low-density planets. Further, HD 152843 c’s radius places it in the ‘Saturn valley’, the observed lack of planets larger than Neptune, but smaller than Saturn. The orbital periods of these planets indicate they are near a 5: 3 mean motion resonance, indicating the possibility of transit timing variations, and hints at the possibility of interaction with a third planet at some point in the evolution of this system. Further, the brightness of the host star and the low density of HD 152843 c make it a key target for atmospheric characterization. © 2024 The Author(s) |
| Keywords | exoplanets; stars: individual |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
| Byline Affiliations | University of Oxford, United Kingdom |
| Centre for Astrophysics | |
| Flatiron Institute, United States | |
| Princeton University, United States | |
| Imperial College London, United Kingdom | |
| University of California Los Angeles, United States | |
| University of Birmingham, United Kingdom | |
| INAF - Palermo Astronomical Observatory, Italy | |
| Galileo Galilei Foundation - INAF, Spain | |
| Institute of Astrophysics of the Canary Islands, Spain | |
| University of La Laguna, Spain | |
| Technical University of Denmark, Denmark | |
| University of St Andrews, United Kingdom | |
| INAF - Astrophysical Observatory of Turin, Italy | |
| Center for Astrophysics Harvard and Smithsonian, United States | |
| Geneva Observatory, Switzerland | |
| INAF - Brera Astronomical Observatory, Italy | |
| University of Edinburgh, United Kingdom |
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