TOI-837 b is a young Saturn-sized exoplanet with a massive 70 M⊕ core

Oscar Barragán; Haochuan Yu; Alix Violet Freckelton; Annabella Meech; Michael Cretignier; Annelies Mortier; Suzanne Aigrain; Baptiste Klein; Niamh K O'Sullivan; Edward Gillen; Louise Dyregaard Nielsen; Manuel Mallorquin; Norbert Zicher

doi:10.1093/mnras/stae1344

TOI-837 b is a young Saturn-sized exoplanet with a massive 70 M_⊕ core

Oscar Barragán^*, Haochuan Yu, Alix Violet Freckelton, Annabella Meech, Michael Cretignier, Annelies Mortier, Suzanne Aigrain, Baptiste Klein, Niamh K O'Sullivan, Edward Gillen, Louise Dyregaard Nielsen, Manuel Mallorquin, Norbert Zicher

^*Corresponding author for this work

Physics and Astronomy

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Abstract

We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837 b, with an orbital period of ∼8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite and groundbased observations, we determine a planetary radius of 0.818^+0.034_−0.024 R_J for TOI-837 b. Through detailed High Accuracy Radial Velocity Planet Searcherspectroscopic time series analysis, we derive a Dopplersemi-amplitude of 34.7^+5.3_−5.6 m s⁻¹, corresponding to a planetary mass of 0.379^+0.058_−0.061 M_J. The derived planetary properties suggest a substantial core of approximately 70 M_⊕, constituting about 60 per cent of the planet’s total mass. This finding poses a significant challenge to existing theoretical models of core formation. We propose that future atmospheric observations with JWST could provide insights into resolving ambiguities of TOI-837 b, offering new perspectives on its composition, formation, and evolution.

Original language	English
Pages (from-to)	4275-4292
Number of pages	18
Journal	Monthly Notices of the Royal Astronomical Society
Volume	531
Issue number	4
Early online date	24 May 2024
DOIs	https://doi.org/10.1093/mnras/stae1344
Publication status	Published - Jul 2024

Keywords

techniques: photometric
techniques: radial velocities
planets and satellites: individual: TOI-837
stars: activity

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10.1093/mnras/stae1344Licence: Creative Commons: Attribution (CC BY)

BarraganO2024TOI837bFinal published version, 13 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

Barragán, O., Yu, H., Freckelton, A. V., Meech, A., Cretignier, M., Mortier, A., Aigrain, S., Klein, B., O'Sullivan, N. K., Gillen, E., Nielsen, L. D., Mallorquin, M., & Zicher, N. (2024). TOI-837 b is a young Saturn-sized exoplanet with a massive 70 M_⊕ core. Monthly Notices of the Royal Astronomical Society, 531(4), 4275-4292. https://doi.org/10.1093/mnras/stae1344

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abstract = "We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837 b, with an orbital period of ∼8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite and groundbased observations, we determine a planetary radius of 0.818+0.034−0.024 RJ for TOI-837 b. Through detailed High Accuracy Radial Velocity Planet Searcherspectroscopic time series analysis, we derive a Dopplersemi-amplitude of 34.7+5.3−5.6 m s−1, corresponding to a planetary mass of 0.379+0.058−0.061 MJ. The derived planetary properties suggest a substantial core of approximately 70 M⊕, constituting about 60 per cent of the planet{\textquoteright}s total mass. This finding poses a significant challenge to existing theoretical models of core formation. We propose that future atmospheric observations with JWST could provide insights into resolving ambiguities of TOI-837 b, offering new perspectives on its composition, formation, and evolution. ",

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AU - Barragán, Oscar

AU - Yu, Haochuan

AU - Freckelton, Alix Violet

AU - Meech, Annabella

AU - Cretignier, Michael

AU - Mortier, Annelies

AU - Aigrain, Suzanne

AU - Klein, Baptiste

AU - O'Sullivan, Niamh K

AU - Gillen, Edward

AU - Nielsen, Louise Dyregaard

AU - Mallorquin, Manuel

AU - Zicher, Norbert

PY - 2024/7

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N2 - We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837 b, with an orbital period of ∼8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite and groundbased observations, we determine a planetary radius of 0.818+0.034−0.024 RJ for TOI-837 b. Through detailed High Accuracy Radial Velocity Planet Searcherspectroscopic time series analysis, we derive a Dopplersemi-amplitude of 34.7+5.3−5.6 m s−1, corresponding to a planetary mass of 0.379+0.058−0.061 MJ. The derived planetary properties suggest a substantial core of approximately 70 M⊕, constituting about 60 per cent of the planet’s total mass. This finding poses a significant challenge to existing theoretical models of core formation. We propose that future atmospheric observations with JWST could provide insights into resolving ambiguities of TOI-837 b, offering new perspectives on its composition, formation, and evolution.

AB - We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837 b, with an orbital period of ∼8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite and groundbased observations, we determine a planetary radius of 0.818+0.034−0.024 RJ for TOI-837 b. Through detailed High Accuracy Radial Velocity Planet Searcherspectroscopic time series analysis, we derive a Dopplersemi-amplitude of 34.7+5.3−5.6 m s−1, corresponding to a planetary mass of 0.379+0.058−0.061 MJ. The derived planetary properties suggest a substantial core of approximately 70 M⊕, constituting about 60 per cent of the planet’s total mass. This finding poses a significant challenge to existing theoretical models of core formation. We propose that future atmospheric observations with JWST could provide insights into resolving ambiguities of TOI-837 b, offering new perspectives on its composition, formation, and evolution.

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KW - planets and satellites: individual: TOI-837

KW - stars: activity

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DO - 10.1093/mnras/stae1344

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