تقرير
TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
| العنوان: | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
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| المؤلفون: | Chaturvedi, P., Bluhm, P., Nagel, E., Hatzes, A. P., Morello, G., Brady, M., Korth, J., Molaverdikhani, K., Kossakowski, D., Caballero, J. A., Guenther, E. W., Pallé, E., Espinoza, N., Seifahrt, A., Lodieu, N., Cifuentes, C., Furlan, E., Amado, P. J., Barclay, T., Bean, J., Béjar, V. J. S., Bergond, G., Boyle, A. W., Ciardi, D., Collins, K. A., Collins, K. I., Esparza-Borges, E., Fukui, A., Gnilka, C. L., Goeke, R., Guerra, P., Henning, Th., Herrero, E., Howell, S. B., Jeffers, S. V., Jenkins, J. M., Jensen, E. L. N., Kasper, D., Kodama, T., Latham, D. W., López-González, M. J., Luque, R., Montes, D., Morales, J. C., Mori, M., Murgas, F., Narita, N., Nowak, G., Parviainen, H., Passegger, V. M., Quirrenbach, A., Reffert, S., Reiners, A., Ribas, I., Ricker, G. R., Rodríguez, E., Rodríguez-López, C., Schlecker, M., Schwarz, R. P., Schweitzer, A., Seager, S., Stefánsson, G., Stockdale, C., Tal-Or, L., Twicken, J. D., Vanaverbeke, S., Wang, G., Watanabe, D., Winn, J. N., Zechmeister, M. |
| المصدر: | A&A 666, A155 (2022) |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We report the discovery and characterization of two small transiting planets orbiting the bright M3.0V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the e planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b ($P_{\rm b}$ = 1.88 d), has a planetary mass of $M_{\rm b} = 3.21\pm0.24$ $M_{\oplus}$ and a radius of $R_{\rm b} =1.280^{+0.038}_{-0.039} R_{\oplus}$, resulting in a density of $\rho_{\rm b} = 8.39^{+ 1.05}_{- 0.92}$ g cm$^{-3}$, which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c ($P_{\rm c} = 15.53$ d), we derive a mass of $M_{\rm c} = 6.64^{+ 0.67}_{- 0.68}$ $M_{\oplus}$, a radius of $R_{\rm c} = 2.06\pm0.04\,R_{\oplus}$, and a bulk density of $\rho_{c} = 2.00^{+ 0.21}_{- 0.19}$ g cm$^{-3}$, which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios. Comment: 26 pages, 15 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/202244056 |
| الوصول الحر: | http://arxiv.org/abs/2208.10351Test |
| رقم الانضمام: | edsarx.2208.10351 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/202244056 |
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