تقرير
TESS discovery of a super-Earth and two sub-Neptunes orbiting the bright, nearby, Sun-like star HD 22946
| العنوان: | TESS discovery of a super-Earth and two sub-Neptunes orbiting the bright, nearby, Sun-like star HD 22946 |
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| المؤلفون: | Cacciapuoti, Luca, Inno, Laura, Covone, Giovanni, Kostov, Veselin B., Barclay, Thomas, Quintana, Elisa V., Colon, Knicole D., Stassun, Keivan G., Hord, Benjamin, Giacalone, Steven, Kane, Stephen R., Hoffman, Kelsey, Rowe, Jason, Wang, Gavin, Collins, Kevin I., Collins, Karen A., Tan, Thiam-Guan, Gallo, Francesco, Magliano, Christian, Ienco, Riccardo M., Rabus, Markus, Ciardi, David R., Furlan, Elise, Howell, Steve B., Gnilka, Crystal L., Scott, Nicholas J., Lester, Kathryn V., Ziegler, Carl, Briceño, César, Law, Nicholas, Mann, Andrew W., Burke, Christopher J., Quinn, Samuel N., Ciaramella, Angelo, De Luca, Pasquale, Fiscale, Stefano, Rotundi, Alessandra, Marcellino, Livia, Galletti, Ardelio, Bifulco, Ida, Oliva, Fabrizio, Spencer, Alton, Kaltenegger, Lisa, McDermott, Scott, Essack, Zahra, Jenkins, Jon M., Wohler, Bill, Winn, Joshua N., Seager, S., Vanderspek, Roland, Zhou, George, Shporer, Avi, Dragomir, Diana, Fong, William |
| المصدر: | A&A 668, A85 (2022) |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We report the Transiting Exoplanet Survey Satellite (TESS) discovery of a three-planet system around the bright Sun-like star HD~22946(V=8.3 mag),also known as TIC~100990000, located 63 parsecs away.The system was observed by TESS in Sectors 3, 4, 30 and 31 and two planet candidates, labelled TESS Objects of Interest (TOIs) 411.01 (planet $c$) and 411.02 (planet $b$), were identified on orbits of 9.57 and 4.04 days, respectively. In this work, we validate the two planets and recover an additional single transit-like signal in the light curve, which suggests the presence of a third transiting planet with a longer period of about 46 days.We assess the veracity of the TESS transit signals and use follow-up imaging and time series photometry to rule out false positive scenarios, including unresolved binary systems, nearby eclipsing binaries or background/foreground stars contaminating the light curves. Parallax measurements from Gaia EDR3, together with broad-band photometry and spectroscopic follow-up by TFOP allowed us to constrain the stellar parameters of TOI-411, including its radius of$1.157\pm0.025R_\odot$. Adopting this value, we determined the radii for the three exoplanet candidates and found that planet $b$ is a super-Earth, with a radius of $1.72\pm0.10R_\oplus$, while planet $c$ and $d$ are sub-Neptunian planets, with radii of$2.74\pm0.14R_\oplus$ and $3.23\pm0.19R_\oplus$ respectively. By using dynamical simulations, we assessed the stability of the system and evaluated the possibility of the presence of other undetected, non-transiting planets by investigating its dynamical packing. We find that the system is dynamically stable and potentially unpacked, with enough space to host at least one more planet between $c$ and $d$.(Abridged) Comment: 21 pages, 12 figures. Accepted for publication on A&A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/202243565 |
| URL الوصول: | http://arxiv.org/abs/2209.09597 |
| رقم الأكسشن: | edsarx.2209.09597 |
| قاعدة البيانات: | arXiv |
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