تقرير
HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away
| العنوان: | HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away |
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| المؤلفون: | Badenas-Agusti, Mariona, Günther, Maximilian N., Daylan, Tansu, Mikal-Evans, Thomas, Vanderburg, Andrew, Huang, Chelsea X., Matthews, Elisabeth, Rackham, Benjamin V., Bieryla, Allyson, Stassun, Keivan G., Kane, Stephen R., Shporer, Avi, Fulton, Benjamin J., Hill, Michelle L., Nowak, Grzegorz, Ribas, Ignasi, Pallé, Enric, Jenkins, Jon M., Latham, David W., Seager, Sara, Ricker, George R., Vanderspek, Roland K., Winn, Joshua N., Abril-Pla, Oriol, Collins, Karen A., Serra, Pere Guerra, Niraula, Prajwal, Rustamkulov, Zafar, Barclay, Thomas, Crossfield, Ian J. M., Howell, Steve B., Ciardi, David R., Gonzales, Erica J., Schlieder, Joshua E., Caldwell, Douglas A., Fausnaugh, Michael, McDermott, Scott, Paegert, Martin, Pepper, Joshua, Rose, Mark E., Twicken, Joseph D. |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We present the discovery of three sub-Neptune-sized planets transiting the nearby and bright Sun-like star HD 191939 (TIC 269701147, TOI 1339), a $K_{s}=7.18$ magnitude G8 V dwarf at a distance of only 54 parsecs. We validate the planetary nature of the transit signals by combining five months of data from the Transiting Exoplanet Survey Satellite with follow-up ground-based photometry, archival optical images, radial velocities, and high angular resolution observations. The three sub-Neptunes have similar radii ($R_{b} = 3.42^{+0.11}_{-0.11}\,R_{\oplus}$, $R_{c}=3.23_{-0.11}^{+0.11}\,R_{\oplus}$, and $R_{d}=3.16_{-0.11}^{+0.11}\,R_{\oplus}$) and their orbits are consistent with a stable, circular, and co-planar architecture near mean motion resonances of 1:3 and 3:4 ($P_{b}=8.88$ days, $P_{c}=28.58$ days, and $P_{d}=38.35$ days). The HD~191939 system is an excellent candidate for precise mass determinations of the planets with high-resolution spectroscopy due to the host star's brightness and low chromospheric activity. Moreover, the system's compact and near-resonant nature can provide an independent way to measure planetary masses via transit timing variations while also enabling dynamical and evolutionary studies. Finally, as a promising target for multi-wavelength transmission spectroscopy of all three planets' atmospheres, HD 191939 can offer valuable insight into multiple sub-Neptunes born from a proto-planetary disk that may have resembled that of the early Sun. Comment: 24 pages, 14 figures, 6 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-3881/aba0b5 |
| URL الوصول: | http://arxiv.org/abs/2002.03958 |
| رقم الأكسشن: | edsarx.2002.03958 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-3881/aba0b5 |
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