TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target
Article
Burt, Jennifer A., Hooton, Matthew J., Mamajek, Eric E., Barragan, Oscar, Millholland, Sarah C., Fairnington, Tyler R, Fisher, Chloe, Halverson, Samuel P., Huang, Chelsea X., Brady, Madison, Seifahrt, Andreas, Gaidos, Erc, Luque, Rafael, Kasper, David and Bean, Jacob L.. 2024. "TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target." The Astrophysical Journal Letters. 971 (1). https://doi.org/10.3847/2041-8213/ad5b52
Article Title | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Burt, Jennifer A., Hooton, Matthew J., Mamajek, Eric E., Barragan, Oscar, Millholland, Sarah C., Fairnington, Tyler R, Fisher, Chloe, Halverson, Samuel P., Huang, Chelsea X., Brady, Madison, Seifahrt, Andreas, Gaidos, Erc, Luque, Rafael, Kasper, David and Bean, Jacob L. |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 971 (1) |
Article Number | L12 |
Number of Pages | 21 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ad5b52 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ad5b52 |
Abstract | We present an updated characterization of the TOI-1685 planetary system, which consists of a Pb = 0.69 day ultra-short-period super-Earth planet orbiting a nearby (d = 37.6 pc) M2.5V star (TIC 28900646, 2MASS J04342248+4302148). This planet was previously featured in two contemporaneous discovery papers, but the best-fit planet mass, radius, and bulk density values were discrepant, allowing it to be interpreted either as a hot, bare rock or a 50% H2O/50% MgSiO3 water world. TOI-1685 b will be observed in three independent JWST Cycle 2 programs, two of which assume the planet is a water world, while the third assumes that it is a hot rocky planet. Here we include a refined stellar classification with a focus on addressing the host star's metallicity, an updated planet radius measurement that includes two sectors of TESS data and multicolor photometry from a variety of ground-based facilities, and a more accurate dynamical mass measurement from a combined CARMENES, InfraRed Doppler, and MAROON-X radial velocity data set. We find that the star is very metal-rich ([Fe/H] ≃ +0.3) and that the planet is systematically smaller, lower mass, and higher density than initially reported, with new best-fit parameters of Rpl = 1.468 |
Keywords | Super Earths ; Exoplanets; Transit photometry; Radial velocity |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | California Institute of Technology (Caltech), United States |
Cavendish Laboratory, United Kingdom | |
University of Oxford, United Kingdom | |
Massachusetts Institute of Technology, United States | |
Centre for Astrophysics | |
Institute for Advanced Engineering and Space Sciences | |
University of Chicago, United States | |
University of Hawaii, United States | |
University of Vienna, Austria |
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