旋转M矮人TOI-1235的过境超级地球行星的精确质量和半径：半径间隙中的行星？

论文标题

旋转M矮人TOI-1235的过境超级地球行星的精确质量和半径：半径间隙中的行星？

Precise mass and radius of a transiting super-Earth planet orbiting the M dwarf TOI-1235: a planet in the radius gap?

论文作者

Bluhm, P., Luque, R., Espinoza, N., Palle, E., Caballero, J. A., Dreizler, S., Livingston, J. H., Mathur, S., Quirrenbach, A., Stock, S., Van Eylen, V., Nowak, G., Lopez, E., Csizmadia, Sz., Osorio, M. R. Zapatero, Schoefer, P., Lillo-Box, J., Oshagh, M., Amado, P. J., Barrado, D., Bejar, V. J. S., Cale, B., Chaturvedi, P., Cifuentes, C., Cochran, W. D., Collins, K. A., Collins, K. I., Cortes-Contreras, M., Alonso, E. Diez, Mufti, M. El, Ercolino, A., Fridlund, M., Gaidos, E., Garcia, R. A., Gonzalez-Alvarez, E., Gonzalez-Cuesta, L., Guerra, P., Hatzes, A. P., Henning, T., Herrero, E., Hidalgo, D., Isopi, G., Jeffers, S. V., Jenkins, J. M., Jensen, E. L. N., Kabath, P., Kemmer, J., Korth, J., Kossakowski, D., Kuerster, M., Lafarga, M., Mallia, F., Montes, D., Morales, J. C., Morales-Calderon, M., Murgas, F., Narita, N., Plavchan, P., Passegger, V. M., Pedraz, S., Rauer, H., Redfield, S., Reffert, S., Reiners, A., Ribas, I., Ricker, G. R., Rodriguez-Lopez, C., Santos, A. R. G., Seager, S., Shan, Y., Schlecker, M., Schweitzer, A., Soto, M. G., Subjak, J., Tal-Or, L., Trifonov, T., Vanaverbeke, S., Vanderspek, R., Wittrock, J., Zechmeister, M., Zohrabi, F.

论文摘要

我们报告了围绕明亮，无效的M0.5 V星TOI-1235（TYC 4384-1735-1，v = 11.5 mag）的过渡行星的确认，其在TESS空间任务的扇区14、20和21的光度序列中检测到其传输信号。我们通过使用carmenes和harps-n光谱仪使用精确的径向速度测量来确认过境信号的行星性质，其周期为3.44 d。 TOI-1235 B与理论模型得出的性质的比较表明，该行星具有岩石的成分，其散装密度略高于地球。特别是，我们测量M_P = 5.9 +/- 0.6 m_earth和R_P的半径= 1.69 +/- 0.08 r_earth，这使得rho_p = 6.7+1.3-1.1 g/cm3。与其他特征良好的系外星系相比，行星半径和质量的特殊组合将我们的发现置于半径间隙，这是岩石行星和行星之间的过渡区域，具有重要的大气信封，很少有已知成员。虽然M矮人的半径差距的确切位置仍然是一个争论的问题，但我们的结果限制了其位于TOI-1235 B（〜60 s_earth）接收到的日期内的1.7 r_earth或更大的r_earth或更大，这使其成为对行星形成和大气进化的进一步研究的非常有趣的对象。

We report the confirmation of a transiting planet around the bright, inactive M0.5 V star TOI-1235 (TYC 4384-1735-1, V = 11.5 mag), whose transit signal was detected in the photometric time series of Sectors 14, 20, and 21 of the TESS space mission. We confirm the planetary nature of the transit signal, which has a period of 3.44 d, by using precise radial velocity measurements with CARMENES and HARPS-N spectrographs. A comparison of the properties derived for TOI-1235 b's with theoretical models reveals that the planet has a rocky composition, with a bulk density slightly higher than Earth's. In particular, we measure a mass of M_p = 5.9+/-0.6 M_Earth and a radius of R_p = 1.69+/-0.08 R_Earth, which together result in a density of rho_p = 6.7+1.3-1.1 g/cm3. When compared with other well-characterized exoplanetary systems, the particular combination of planetary radius and mass puts our discovery in the radius gap, a transition region between rocky planets and planets with significant atmospheric envelopes, with few known members. While the exact location of the radius gap for M dwarfs is still a matter of debate, our results constrain it to be located at around 1.7 R_Earth or larger at the insolation levels received by TOI-1235 b (~60 S_Earth), which makes it an extremely interesting object for further studies of planet formation and atmospheric evolution.

下载PDF全文

下载文献需遵守相关版权规定

论文标题