An ultra-short-period transiting super-Earth orbiting the M3 dwarf TOI-1685
An ultra-short-period transiting super-Earth orbiting the M3 dwarf TOI-1685
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绕 M3 矮星 TOI-1685 运行的超短周期凌日超级地球
DOI：
10.1051/0004-6361/202140688
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发表时间：
2021
影响因子：
6.5
通讯作者：
Bluhm P
中科院分区：
文献类型：
--
作者：
Bluhm P
Dynamical histories of planetary systems, as well as the atmospheric evolution of highly irradiated planets, can be studied by characterizing the ultra-short-period planet population, which the TESS mission is particularly well suited to discover. Here, we report on the follow-up of a transit signal detected in the TESS sector 19 photometric time series of the M3.0 V star TOI-1685 (2MASS J04342248+4302148). We confirm the planetary nature of the transit signal, which has a period ofPb= d, using precise radial velocity measurements taken with the CARMENES spectrograph. From the joint photometry and radial velocity analysis, we estimate the following parameters for TOI-1685 b: a mass ofMb=M⊕, a radius ofRb=R⊕, which together result in a bulk density ofρb= g cm−3, and an equilibrium temperature ofTeq= K. TOI-1685 b is the least dense ultra-short-period planet around an M dwarf known to date. TOI-1685 b is also one of the hottest transiting super-Earth planets with accurate dynamical mass measurements, which makes it a particularly attractive target for thermal emission spectroscopy. Additionally, we report with moderate evidence an additional non-transiting planet candidate in the system, TOI-1685 [c], which has an orbital period ofPc= d.
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