A Transiting, Temperate Mini-Neptune Orbiting the M Dwarf TOI-1759 Unveiled by TESS
A Transiting, Temperate Mini-Neptune Orbiting the M Dwarf TOI-1759 Unveiled by TESS
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DOI：
10.3847/1538-3881/ac4af0
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发表时间：
2022-02
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通讯作者：
N. Espinoza;E. Pall'e;J. Kemmer;R. Luque;J. Caballero;C. Cifuentes;E. Herrero;V. J. S. B'ejar;S. Stock;K. Molaverdikhani;G. Morello;D. Kossakowski;M. Schlecker;P. Amado;P. Bluhm;M. Cort'es-Contreras;T. Henning;L. Kreidberg;M. Kurster;M. Lafarga;N. Lodieu;J. Morales;M. Oshagh;V. Passegger;A. Pavlov;A. Quirrenbach;S. Reffert;A. Reiners;I. Ribas;E. Rodr'iguez;C. R. L'opez;A. Schweitzer;T. Trifonov;P. Chaturvedi;S. Dreizler;S. Jeffers;A. Kaminski;M. J. L'opez-Gonz'alez;J. Lillo-Box;D. Montes;G. Nowak;S. Pedraz;S. Vanaverbeke;M. Z. Osorio;M. Zechmeister;K. Collins;E. Girardin;P. Guerra;R. Naves;I. Crossfield;E. Matthews;S. Howell;D. Ciardi;E. Gonzales;R. Matson;C. Beichman;J. Schlieder;T. Barclay;M. Vezie;J. Villaseñor;T. Daylan;Ismael Mireies;D. Dragomir;J. Twicken;J. Jenkins;J. Winn;D. Latham;G. Ricker;S. Seager
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作者：
N. Espinoza;E. Pall'e;J. Kemmer;R. Luque;J. Caballero;C. Cifuentes;E. Herrero;V. J. S. B'ejar;S. Stock;K. Molaverdikhani;G. Morello;D. Kossakowski;M. Schlecker;P. Amado;P. Bluhm;M. Cort'es-Contreras;T. Henning;L. Kreidberg;M. Kurster;M. Lafarga;N. Lodieu;J. Morales;M. Oshagh;V. Passegger;A. Pavlov;A. Quirrenbach;S. Reffert;A. Reiners;I. Ribas;E. Rodr'iguez;C. R. L'opez;A. Schweitzer;T. Trifonov;P. Chaturvedi;S. Dreizler;S. Jeffers;A. Kaminski;M. J. L'opez-Gonz'alez;J. Lillo-Box;D. Montes;G. Nowak;S. Pedraz;S. Vanaverbeke;M. Z. Osorio;M. Zechmeister;K. Collins;E. Girardin;P. Guerra;R. Naves;I. Crossfield;E. Matthews;S. Howell;D. Ciardi;E. Gonzales;R. Matson;C. Beichman;J. Schlieder;T. Barclay;M. Vezie;J. Villaseñor;T. Daylan;Ismael Mireies;D. Dragomir;J. Twicken;J. Jenkins;J. Winn;D. Latham;G. Ricker;S. Seager
我们报告的发现和表征TOI-1759 B，温带（400 K）亚海王星大小的系外行星轨道的M矮TOI-1759（TIC 408636441）。TOI-1759 B被TESS观测到在16、17和24扇区凌日，每个扇区只观测到一次凌日，造成了行星候选者轨道周期的模糊性。地面光度观测，结合CARMENES摄谱仪获得的径向速度测量，确认了实际周期为18.85019 ± 0.00014天。对所有可用的测光和径向速度的联合分析显示，半径为3.17 ± 0.10 R <$，质量为10.8 ± 1.5 M <$。结合TOI-1759的恒星性质（R = 0.597 ± 0.015 R; M = 0.606 ± 0.020 M; T eff = 4065 ± 51 K），我们计算出该行星的透射光谱度量（TSM）值超过80，使其成为透射光谱研究的良好目标。TOI-1759 B是前五个温带小型系外行星之一（T eq 200天似乎存在于我们的径向速度中。虽然我们的数据表明两者都可能来自恒星活动，但鉴于我们与CARMENES的径向速度活动的200天基线，很难确定后一个信号的来源和周期。应进行更长的基线径向速度调查，以揭示这一长周期信号的真实性质。
We report the discovery and characterization of TOI-1759 b, a temperate (400 K) sub-Neptune-sized exoplanet orbiting the M dwarf TOI-1759 (TIC 408636441). TOI-1759 b was observed by TESS to transit in Sectors 16, 17, and 24, with only one transit observed per sector, creating an ambiguity regarding the orbital period of the planet candidate. Ground-based photometric observations, combined with radial-velocity measurements obtained with the CARMENES spectrograph, confirm an actual period of 18.85019 ± 0.00014 days. A joint analysis of all available photometry and radial velocities reveals a radius of 3.17 ± 0.10 R ⊕ and a mass of 10.8 ± 1.5 M ⊕. Combining this with the stellar properties derived for TOI-1759 (R ⋆ = 0.597 ± 0.015 R ⊙; M ⋆ = 0.606 ± 0.020 M ⊙; T eff = 4065 ± 51 K), we compute a transmission spectroscopic metric (TSM) value of over 80 for the planet, making it a good target for transmission spectroscopy studies. TOI-1759 b is among the top five temperate, small exoplanets (T eq 200 days seem to be present in our radial velocities. While our data suggest both could arise from stellar activity, the later signal’s source and periodicity are hard to pinpoint given the ∼200 days baseline of our radial-velocity campaign with CARMENES. Longer baseline radial-velocity campaigns should be performed in order to unveil the true nature of this long-period signal.