Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
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DOI：
10.1051/0004-6361/202038967
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发表时间：
2020-09
影响因子：
6.5
通讯作者：
J. Kemmer;S. Stock;D. Kossakowski;A. Kaminski;K. Molaverdikhani;M. Schlecker;J. A. Caballero
中科院分区：
文献类型：
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作者：
J. Kemmer;S. Stock;D. Kossakowski;A. Kaminski;K. Molaverdikhani;M. Schlecker;J. A. Caballero
GJ3473b(G50-16，TOI-488.01)是一颗绕着M4矮星运行的地球大小的热行星，它的凌日信号(P=1.1980035±0.0000018 d)是由凌日系外行星探测卫星(TESS)首次探测到的。通过与Carmenes、IRD和HARPS的后续径向速度观测的联合模拟，以及与LCOGT、MASCAT和MUSCAT2的广泛的地面光度跟踪观测，我们确定了精确的行星质量Mb=1.86±0.30M⊕和半径Rb=1.264±0.050 R⊕。此外，我们还发现了该星系中第二颗温带的非凌日行星GJ3473c，其质量最小，McSin i=7.41±0.91M⊕，轨道周期Pc=15.509±0.033 d。该星系的内行星GJ3473b是迄今已知的最热的凌日行星之一，伴随着动力学质量测量，这使得它成为热发射光谱的特别吸引人的目标。
We present the confirmation and characterisation of GJ 3473 b (G 50–16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal (P = 1.1980035 ± 0.0000018 d) was first detected by the Transiting Exoplanet Survey Satellite (TESS). Through a joint modelling of follow-up radial velocity observations with CARMENES, IRD, and HARPS together with extensive ground-based photometric follow-up observations with LCOGT, MuSCAT, and MuSCAT2, we determined a precise planetary mass, Mb = 1.86 ± 0.30 M⊕, and radius, Rb = 1.264 ± 0.050 R⊕. Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, Mc sin i = 7.41 ± 0.91 M⊕, and orbital period, Pc = 15.509 ± 0.033 d. The inner planet of the system, GJ 3473 b, is one of the hottest transiting Earth-sized planets known thus far, accompanied by a dynamical mass measurement, which makes it a particularly attractive target for thermal emission spectroscopy.