| Autor: |
Maria Korolik, Rachael M. Roettenbacher, Debra A. Fischer, Stephen R. Kane, Jean M. Perkins, John D. Monnier, Claire L. Davies, Stefan Kraus, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Tyler Gardner, Cyprien Lanthermann, Gail H. Schaefer, Benjamin Setterholm, John M. Brewer, Joe Llama, Lily L. Zhao, Andrew E. Szymkowiak, Gregory W. Henry |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
The Astronomical Journal, Vol 166, Iss 3, p 123 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1538-3881 |
| DOI: |
10.3847/1538-3881/ace906 |
| Popis: |
To accurately characterize the planets a star may be hosting, stellar parameters must first be well determined. τ Ceti is a nearby solar analog and often a target for exoplanet searches. Uncertainties in the observed rotational velocities have made constraining τ Ceti’s inclination difficult. For planet candidates from radial velocity (RV) observations, this leads to substantial uncertainties in the planetary masses, as only the minimum mass ( $m\sin i$ ) can be constrained with RV. In this paper, we used new long-baseline optical interferometric data from the CHARA Array with the MIRC-X beam combiner and extreme precision spectroscopic data from the Lowell Discovery Telescope with EXPRES to improve constraints on the stellar parameters of τ Ceti. Additional archival data were obtained from a Tennessee State University Automatic Photometric Telescope and the Mount Wilson Observatory HK project. These new and archival data sets led to improved stellar parameter determinations, including a limb-darkened angular diameter of 2.019 ± 0.012 mas and rotation period of 46 ± 4 days. By combining parameters from our data sets, we obtained an estimate for the stellar inclination of 7° ± 7°. This nearly pole-on orientation has implications for the previously reported exoplanets. An analysis of the system dynamics suggests that the planetary architecture described by Feng et al. may not retain long-term stability for low orbital inclinations. Additionally, the inclination of τ Ceti reveals a misalignment between the inclinations of the stellar rotation axis and the previously measured debris disk rotation axis ( i _disk = 35° ± 10°). |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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