Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266
We present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two known transiting sub-Neptunes at 10.8 and 18.8 days. We integrated our measurements with existing HARPS-N measurements for this system and derived revised...
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IOP Publishing
2025-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ada121 |
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| author | Dakotah Tyler Erik A. Petigura James Rogers Jack Lubin Andreas Seifhart Jacob L. Bean Madison Brady Rafael Luque |
| author_facet | Dakotah Tyler Erik A. Petigura James Rogers Jack Lubin Andreas Seifhart Jacob L. Bean Madison Brady Rafael Luque |
| author_sort | Dakotah Tyler |
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| description | We present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two known transiting sub-Neptunes at 10.8 and 18.8 days. We integrated our measurements with existing HARPS-N measurements for this system and derived revised masses for TOI-1266 b and c of M _b = 4.09 ± 0.45 M _⊕ and M _c = 2.64 ± 0.52 M _⊕ , respectively. The Keplerian fit from the combined datasets enabled an ≈35% and ≈41% improvement in mass precision for planet b and c, respectively, compared to the previously published values. With bulk densities of ρ _b = 1.25 ± 0.21 g cm ^−3 and ρ _c = 1.51 ± 0.39 g cm ^−3 , the planets are among the lowest density sub-Neptunes orbiting an M dwarf. They are both consistent with rocky cores surrounded by hydrogen helium envelopes. TOI-1266 c may also be consistent with a water-rich composition, but we disfavor that interpretation from an Occam's razor perspective. |
| format | Article |
| id | doaj-art-6f8fea04a45b4571bb5811879d04812b |
| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-6f8fea04a45b4571bb5811879d04812b2025-02-03T13:46:47ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01169210910.3847/1538-3881/ada121Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266Dakotah Tyler0https://orcid.org/0000-0003-0298-4667Erik A. Petigura1https://orcid.org/0000-0003-0967-2893James Rogers2https://orcid.org/0000-0001-7615-6798Jack Lubin3https://orcid.org/0000-0001-8342-7736Andreas Seifhart4https://orcid.org/0000-0003-4526-3747Jacob L. Bean5https://orcid.org/0000-0003-4733-6532Madison Brady6https://orcid.org/0000-0003-2404-2427Rafael Luque7https://orcid.org/0000-0002-4671-2957Department of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA ; dakotah.tyler.astro@gmail.comDepartment of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA ; dakotah.tyler.astro@gmail.comDepartment of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA ; dakotah.tyler.astro@gmail.comDepartment of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA ; dakotah.tyler.astro@gmail.comGemini Observatory , Hilo, HI 96720, USADepartment of Astronomy & Astrophysics, University of Chicago , Chicago, IL, USADepartment of Astronomy & Astrophysics, University of Chicago , Chicago, IL, USADepartment of Astronomy & Astrophysics, University of Chicago , Chicago, IL, USAWe present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two known transiting sub-Neptunes at 10.8 and 18.8 days. We integrated our measurements with existing HARPS-N measurements for this system and derived revised masses for TOI-1266 b and c of M _b = 4.09 ± 0.45 M _⊕ and M _c = 2.64 ± 0.52 M _⊕ , respectively. The Keplerian fit from the combined datasets enabled an ≈35% and ≈41% improvement in mass precision for planet b and c, respectively, compared to the previously published values. With bulk densities of ρ _b = 1.25 ± 0.21 g cm ^−3 and ρ _c = 1.51 ± 0.39 g cm ^−3 , the planets are among the lowest density sub-Neptunes orbiting an M dwarf. They are both consistent with rocky cores surrounded by hydrogen helium envelopes. TOI-1266 c may also be consistent with a water-rich composition, but we disfavor that interpretation from an Occam's razor perspective.https://doi.org/10.3847/1538-3881/ada121Exoplanet evolutionExoplanet astronomyExoplanet detection methodsRadial velocityExoplanet systemsExoplanet atmospheric composition |
| spellingShingle | Dakotah Tyler Erik A. Petigura James Rogers Jack Lubin Andreas Seifhart Jacob L. Bean Madison Brady Rafael Luque Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 The Astronomical Journal Exoplanet evolution Exoplanet astronomy Exoplanet detection methods Radial velocity Exoplanet systems Exoplanet atmospheric composition |
| title | Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 |
| title_full | Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 |
| title_fullStr | Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 |
| title_full_unstemmed | Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 |
| title_short | Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 |
| title_sort | revised masses for low density planets orbiting the disordered m dwarf system toi 1266 |
| topic | Exoplanet evolution Exoplanet astronomy Exoplanet detection methods Radial velocity Exoplanet systems Exoplanet atmospheric composition |
| url | https://doi.org/10.3847/1538-3881/ada121 |
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