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Creators/Authors contains: "Seifhart, Andreas"

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  1. ; ; ; ; ; ; ; (, The Astronomical Journal)
    Abstract 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 ofMb= 4.09 ± 0.45M⊕andMc= 2.64 ± 0.52M⊕, 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 ofρb= 1.25 ± 0.21 g cm−3andρc= 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. 
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    Free, publicly-accessible full text available February 3, 2026