A Hot Mars-sized Exoplanet Transiting an M Dwarf
A Hot Mars-sized Exoplanet Transiting an M Dwarf
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DOI：
10.3847/1538-3881/ac3088
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
C. Cañas;S. Mahadevan;W. Cochran;C. Bender;E. Feigelson;C. Harman;R. Kopparapu;Gabriel A. Caceres;S. Diddams;M. Endl;E. Ford;S. Halverson;F. Hearty;Sinclaire Jones;S. Kanodia;Andrea S. J. Lin;A. Metcalf;A. Monson;J. Ninan;L. Ramsey;Paul Robertson;Arpita Roy;C. Schwab;G. Stefansson
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作者：
C. Cañas;S. Mahadevan;W. Cochran;C. Bender;E. Feigelson;C. Harman;R. Kopparapu;Gabriel A. Caceres;S. Diddams;M. Endl;E. Ford;S. Halverson;F. Hearty;Sinclaire Jones;S. Kanodia;Andrea S. J. Lin;A. Metcalf;A. Monson;J. Ninan;L. Ramsey;Paul Robertson;Arpita Roy;C. Schwab;G. Stefansson
我们验证了一个超短周期行星的行星性质的M矮KOI-4777轨道。我们使用开普勒太空测光，高精度，近红外多普勒光谱从可移动区行星地球，和自适应光学成像的组合来表征这个系统。KOI-4777.01（英语：KOI-4777.01）是一颗火星大小的系外行星（R p = 0.51 ± 0.03 R），每0.412天（约9.9小时）绕主星星一周。这是已知的最小的经过验证的超短周期行星，我们没有看到使用我们的HPF RV的其他大质量同伴的证据。我们通过假设行星的密度小于铁，将上3σ质量限制为Mp < 0.34 M。获得KOI-4777.01的质量测量值超出了当前仪器的能力。
We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R p = 0.51 ± 0.03R ⊕) orbiting the host star every 0.412 days (∼9.9 hr). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper 3σ mass to M p < 0.34 M ⊕ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.