A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18
Planets 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 ty...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2020
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| Online Access: | https://hdl.handle.net/1721.1/124746 |
| _version_ | 1826205315774808064 |
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| author | Crossfield, Ian J. M. Matthews, Elisabeth Halverson, Sam Berardo, David Mehrle, Nicholas Huang, Chelsea Burt, Jennifer Seager, Sara Ricker, George R. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Crossfield, Ian J. M. Matthews, Elisabeth Halverson, Sam Berardo, David Mehrle, Nicholas Huang, Chelsea Burt, Jennifer Seager, Sara Ricker, George R. |
| author_sort | Crossfield, Ian J. M. |
| collection | MIT |
| description | Planets 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 o, 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. ©2019 |
| first_indexed | 2024-09-23T13:10:44Z |
| format | Article |
| id | mit-1721.1/124746 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:10:44Z |
| publishDate | 2020 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1247462022-10-01T13:34:36Z A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 Crossfield, Ian J. M. Matthews, Elisabeth Halverson, Sam Berardo, David Mehrle, Nicholas Huang, Chelsea Burt, Jennifer Seager, Sara Ricker, George R. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Planets 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 o, 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. ©2019 NSF (grant no. AST-1824644) NASA Caltech/JPL (grant no. RSA-1610091) 2020-04-17T21:10:00Z 2020-04-17T21:10:00Z 2019-09 2019-06 2020-04-13T14:42:41Z Article http://purl.org/eprint/type/JournalArticle 2041-8213 2041-8205 https://hdl.handle.net/1721.1/124746 Crossfield, Ian J.M., et al., "A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18." Astrophysical journal. Letters 883, 1 (September 2019): letter 16 doi 10.3847/2041-8213/AB3D30 ©2019 Author(s) en 10.3847/2041-8213/AB3D30 Astrophysical journal. Letters Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/ application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Crossfield, Ian J. M. Matthews, Elisabeth Halverson, Sam Berardo, David Mehrle, Nicholas Huang, Chelsea Burt, Jennifer Seager, Sara Ricker, George R. A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title | A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title_full | A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title_fullStr | A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title_full_unstemmed | A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title_short | A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18 |
| title_sort | super earth and sub neptune transiting the late type m dwarf lp 791 18 |
| url | https://hdl.handle.net/1721.1/124746 |
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