TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target
We present an updated characterization of the TOI-1685 planetary system, which consists of a P b = 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 p...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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American Astronomical Society
2024
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| _version_ | 1811140427690016768 |
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| author | Burt, JA Hooton, MJ Mamajek, EE Barragán, O Millholland, SC Fairnington, TR Fisher, C Halverson, SP Huang, CX Brady, M Seifahrt, A Gaidos, E Luque, R Kasper, D Bean, JL |
| author_facet | Burt, JA Hooton, MJ Mamajek, EE Barragán, O Millholland, SC Fairnington, TR Fisher, C Halverson, SP Huang, CX Brady, M Seifahrt, A Gaidos, E Luque, R Kasper, D Bean, JL |
| author_sort | Burt, JA |
| collection | OXFORD |
| description | We present an updated characterization of the TOI-1685 planetary system, which consists of a P b = 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 R pl = 1.468 −0.051+0.050 R ⊕ and M pl = 3.03−0.32+0.33 M ⊕. These results fall in between the previously derived values and suggest that TOI-1685 b is a hot rocky planet with an Earth-like density (ρ pl = 5.3 ± 0.8 g cm−3, or 0.96 ρ ⊕), high equilibrium temperature (T eq = 1062 ± 27 K), and negligible volatiles, rather than a water world. |
| first_indexed | 2024-09-25T04:21:49Z |
| format | Journal article |
| id | oxford-uuid:40611ddb-df76-462e-9d55-a46bfa6f94ad |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:21:49Z |
| publishDate | 2024 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | oxford-uuid:40611ddb-df76-462e-9d55-a46bfa6f94ad2024-08-09T19:35:28ZTOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 TargetJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:40611ddb-df76-462e-9d55-a46bfa6f94adEnglishJisc Publications RouterAmerican Astronomical Society2024Burt, JAHooton, MJMamajek, EEBarragán, OMillholland, SCFairnington, TRFisher, CHalverson, SPHuang, CXBrady, MSeifahrt, AGaidos, ELuque, RKasper, DBean, JLWe present an updated characterization of the TOI-1685 planetary system, which consists of a P b = 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 R pl = 1.468 −0.051+0.050 R ⊕ and M pl = 3.03−0.32+0.33 M ⊕. These results fall in between the previously derived values and suggest that TOI-1685 b is a hot rocky planet with an Earth-like density (ρ pl = 5.3 ± 0.8 g cm−3, or 0.96 ρ ⊕), high equilibrium temperature (T eq = 1062 ± 27 K), and negligible volatiles, rather than a water world. |
| spellingShingle | Burt, JA Hooton, MJ Mamajek, EE Barragán, O Millholland, SC Fairnington, TR Fisher, C Halverson, SP Huang, CX Brady, M Seifahrt, A Gaidos, E Luque, R Kasper, D Bean, JL TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title_full | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title_fullStr | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title_full_unstemmed | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title_short | TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target |
| title_sort | 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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