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dc.contributor.authorCrossfield, Ian
dc.identifier.citationIan J. M. Crossfield et al 2019 ApJL 883 L16en_US
dc.descriptionThis work is licensed under a Creative Commons Attribution 3.0 Unported License.en_US
dc.description.abstractPlanets occur most frequently around cool dwarfs, but only a handful of specific examples are known to orbit the latest-type M stars. Using TESS photometry, we report the discovery of two planets transiting the low-mass star called LP 791-18 (identified by TESS as TOI 736). This star has spectral type M6V, effective temperature 2960 K, and radius 0.17 R ⊙, making it the third-coolest star known to host planets. The two planets straddle the radius gap seen for smaller exoplanets; they include a 1.1R ⊕ planet on a 0.95 day orbit and a 2.3R ⊕ planet on a 5 day orbit. Because the host star is small the decrease in light during these planets' transits is fairly large (0.4% and 1.7%). This has allowed us to detect both planets' transits from ground-based photometry, refining their radii and orbital ephemerides. In the future, radial velocity observations and transmission spectroscopy can both probe these planets' bulk interior and atmospheric compositions, and additional photometric monitoring would be sensitive to even smaller transiting planets.en_US
dc.publisherAmerican Astronomical Societyen_US
dc.rights© 2019. The American Astronomical Society.en_US
dc.subjectExoplanet astronomyen_US
dc.subjectExoplanet systemsen_US
dc.subjectHigh resolution spectroscopyen_US
dc.subjectLow mass starsen_US
dc.subjectTransit photometryen_US
dc.titleA Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18en_US
kusw.kuauthorCrossfield, Ian
kusw.kudepartmentPhysics and Astronomyen_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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© 2019. The American Astronomical Society.
Except where otherwise noted, this item's license is described as: © 2019. The American Astronomical Society.