Academic Journal
Validation of a Third Planet in the LHS 1678 System
| العنوان: | Validation of a Third Planet in the LHS 1678 System |
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| المؤلفون: | Silverstein, Michele L., Barclay, Thomas, Schlieder, Joshua E., Collins, Karen A., Schwarz, Richard P., Hord, Benjamin J., Rowe, Jason F., Kruse, Ethan, Astudillo-Defru, Nicola, Bonfils, Xavier, Caldwell, Douglas A., Charbonneau, David, Cloutier, Ryan, Collins, Kevin I., Daylan, Tansu, Fong, William, Jenkins, Jon M., Kunimoto, Michelle, Mcdermott, Scott, Murgas, Felipe, Palle, Enric, Ricker, George R., Seager, Sara, Shporer, Avi, Tey, Evan, Vanderspek, Roland, Winn, Joshua N. |
| المساهمون: | Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA) |
| المصدر: | The Astronomical Journal ; https://insu.hal.science/insu-04836859 ; The Astronomical Journal, 2024, 167, ⟨10.3847/1538-3881/ad3040⟩ |
| بيانات النشر: | CCSD |
| سنة النشر: | 2024 |
| المجموعة: | Institut national des sciences de l'Univers: HAL-INSU |
| مصطلحات موضوعية: | Transit photometry, Transit timing variation method, M dwarf stars, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics, Exoplanet systems, [SDU]Sciences of the Universe [physics] |
| الوصف: | International audience ; The nearby LHS 1678 (TOI-696) system contains two confirmed planets and a wide-orbit, likely brown-dwarf companion, which orbit an M2 dwarf with a unique evolutionary history. The host star occupies a narrow "gap" in the Hertzsprung–Russell diagram lower main sequence, associated with the M dwarf fully convective boundary and long-term luminosity fluctuations. This system is one of only about a dozen M dwarf multiplanet systems to date that hosts an ultra-short-period planet (USP). Here we validate and characterize a third planet in the LHS 1678 system using TESS Cycle 1 and 3 data and a new ensemble of ground-based light curves. LHS 1678 d is a 0.98 ± 0.07 R ⊕ planet in a 4.97 day orbit, with an insolation flux of ${9.1}_{-0.8}^{+0.9}\,{S}_{\oplus }$ . These properties place it near 4:3 mean motion resonance with LHS 1678 c and in company with LHS 1678 c in the Venus zone. LHS 1678 c and d are also twins in size and predicted mass, making them a powerful duo for comparative exoplanet studies. LHS 1678 d joins its siblings as another compelling candidate for atmospheric measurements with the JWST and mass measurements using high-precision radial velocity techniques. Additionally, USP LHS 1678 b breaks the "peas-in-a-pod" trend in this system although additional planets could fill in the "pod" beyond its orbit. LHS 1678's unique combination of system properties and their relative rarity among the ubiquity of compact multiplanet systems around M dwarfs makes the system a valuable benchmark for testing theories of planet formation and evolution. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/arxiv/2403.00110; ARXIV: 2403.00110; BIBCODE: 2024AJ.167.255S |
| DOI: | 10.3847/1538-3881/ad3040 |
| الاتاحة: | https://insu.hal.science/insu-04836859 https://insu.hal.science/insu-04836859v1/document https://insu.hal.science/insu-04836859v1/file/Silverstein_2024_AJ_167_255.pdf https://doi.org/10.3847/1538-3881/ad3040 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.F8E5B8C5 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3847/1538-3881/ad3040 |
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