TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
We report the discovery and characterization of two small transiting planets orbiting the bright M3.0 V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using pr...
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2023
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| Online Access: | https://hdl.handle.net/1721.1/148388 |
| _version_ | 1826201267288932352 |
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| author | Seager, Sara |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Seager, Sara |
| author_sort | Seager, Sara |
| collection | MIT |
| description | We report the discovery and characterization of two small transiting planets orbiting the bright M3.0 V star TOI-1468 (LSPM
J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm
the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period
planet, TOI-1468 b (Pb = 1.88 d), has a planetary mass of Mb = 3.21 ± 0.24 M⊕ and a radius of Rb = 1.280+0.038
−0.039 R⊕, resulting in a
density of ρb = 8.39+1.05
−0.92 g cm−3
, which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (Pc = 15.53 d),
we derive a mass of Mc = 6.64+0.67
−0.68 M⊕, a radius of Rc = 2.06 ± 0.04 R⊕, and a bulk density of ρc = 2.00+0.21
−0.19 g cm−3
, which corresponds
to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our
system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help
determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet
formation and evolution scenarios. |
| first_indexed | 2024-09-23T11:48:56Z |
| format | Article |
| id | mit-1721.1/148388 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:48:56Z |
| publishDate | 2023 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1483882023-03-08T03:30:05Z TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley Seager, Sara Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences We report the discovery and characterization of two small transiting planets orbiting the bright M3.0 V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b (Pb = 1.88 d), has a planetary mass of Mb = 3.21 ± 0.24 M⊕ and a radius of Rb = 1.280+0.038 −0.039 R⊕, resulting in a density of ρb = 8.39+1.05 −0.92 g cm−3 , which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (Pc = 15.53 d), we derive a mass of Mc = 6.64+0.67 −0.68 M⊕, a radius of Rc = 2.06 ± 0.04 R⊕, and a bulk density of ρc = 2.00+0.21 −0.19 g cm−3 , which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios. 2023-03-07T15:42:23Z 2023-03-07T15:42:23Z 2022 2023-03-07T15:32:22Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148388 Seager, Sara. 2022. "TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley." Astronomy and Astrophysics, 666. en 10.1051/0004-6361/202244056 Astronomy and Astrophysics Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf EDP Sciences EDP Sciences |
| spellingShingle | Seager, Sara TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title_full | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title_fullStr | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title_full_unstemmed | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title_short | TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley |
| title_sort | toi 1468 a system of two transiting planets a super earth and a mini neptune on opposite sides of the radius valley |
| url | https://hdl.handle.net/1721.1/148388 |
| work_keys_str_mv | AT seagersara toi1468asystemoftwotransitingplanetsasuperearthandaminineptuneonoppositesidesoftheradiusvalley |