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arXiv 2109.09346astro-ph.EP
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TOI-1201 b:一个迷你海王星过境一个明亮和适度年轻的M矮星

TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf

D. Kossakowski, J. Kemmer, P. Bluhm, S. Stock, J. A. Caballero, V. J. S. Béjar, C. Cardona Guillén, N. Lodieu, K. A. Collins, M. Oshagh, M. Schlecker, N. Espino… 展开作者

D. Kossakowski, J. Kemmer, P. Bluhm, S. Stock, J. A. Caballero, V. J. S. Béjar, C. Cardona Guillén, N. Lodieu, K. A. Collins, M. Oshagh, M. Schlecker, N. Espinoza, E. Pallé, Th. Henning, L. Kreidberg, M. Kürster, P. J. Amado, D. R. Anderson, J. C. Morales, D. Conti, D. Galadi-Enriquez, P. Guerra, S. Cartwright, D. Charbonneau, P. Chaturvedi, C. Cifuentes, M. Cortes Contreras, S. Dreizler, C. Hellier, C. Henze, E. Herrero, S. V. Jeffers, J. M. Jenkins, E. L. N. Jensen, A. Kaminski, J. F. Kielkopf, M. Kunimoto, M. Lafarga, D. W. Latham, J. Lillo-Box, R. Luque, K. Molaverdikhani, D. Montes, G. Morello, E. H. Morgan, G. Nowak, A. Pavlov, M. Perger, E. V. Quintana, A. Quirrenbach, S. Reffert, A. Reiners, G. Ricker, I. Ribas, C. Rodriguez Lopez, M. R. Zapatero Osorio, S. Seager, P. Schoefer, A. Schweitzer, T. Trifonov, S. Vanaverbeke, R. Vanderspek, R. West, J. Winn, M. Zechmeister

摘要:

我们利用凌日系外行星巡天卫星(TESS)的数据,在一个等质量的$\sim$ 8角秒宽的双星系统中,发现了一个围绕TOI-1201的凌日小海王星,这是一个相对明亮和中等年轻的早期M矮星($J \approx$ 9.5等,$\sim$ 600-800百万年)。TOI-1201 b的轨道周期为2.49 d,是一个温暖的迷你海王星,半径为$R_\mathrm{b} = 2.415\pm0.090 R_\oplus$。这个信号也出现在CARMENES的精确径向速度测量中,证实了行星的存在,并提供了$M_\mathrm{b} = 6.28\pm0.88 M_\oplus$的行星质量,因此估计的体积密度为$2.45^{+0.48}_{-0.42}$ g cm $^{-3}$。光谱观测还显示了一个信号的证据,周期为19天和一个长期的周期性变化的来源不明。结合来自WASP-South和ASAS-SN的地面光度监测,我们将19 d信号归因于恒星旋转周期($P_{rot}=$ 19-23 d),尽管我们不能排除光度变化属于视觉上接近的双星伴星。我们计算了TOI-1201及其伴星的精确恒星参数。这颗过境行星是即将到来的詹姆斯韦伯太空望远镜大气特征描述的一个很好的目标(透射光谱度量是$97^{+21}_{-16}$)。它也是可行的测量其自旋轨道对齐通过罗西特-麦克劳克林效应使用当前国家的最先进的光谱仪与亚米每秒的径向速度精度。

英文摘要:

We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf ($J \approx$ 9.5 mag, $\sim$600-800 Myr) in an equal-mass $\sim$8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite (TESS), along with follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 b is a warm mini-Neptune with a radius of $R_\mathrm{b} = 2.415\pm0.090 R_\oplus$. This signal is also present in the precise radial velocity measurements from CARMENES, confirming the existence of the planet and providing a planetary mass of $M_\mathrm{b} = 6.28\pm0.88 M_\oplus$ and, thus, an estimated bulk density of $2.45^{+0.48}_{-0.42}$ g cm$^{-3}$. The spectroscopic observations additionally show evidence of a signal with a period of 19 d and a long periodic variation of undetermined origin. In combination with ground-based photometric monitoring from WASP-South and ASAS-SN, we attribute the 19 d signal to the stellar rotation period ($P_{rot}=$ 19-23 d), although we cannot rule out that the variation seen in photometry belongs to the visually close binary companion. We calculate precise stellar parameters for both TOI-1201 and its companion. The transiting planet is an excellent target for atmosphere characterization (the transmission spectroscopy metric is $97^{+21}_{-16}$) with the upcoming James Webb Space Telescope. It is also feasible to measure its spin-orbit alignment via the Rossiter-McLaughlin effect using current state-of-the-art spectrographs with submeter per second radial velocity precision.

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