TESS Hunt for Young and Maturing Exoplanets (THYME) XII: A Young Mini-Neptune on the Upper Edge of the Radius Valley in the Hyades Cluster
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2024
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| author | Distler, Adam Soares-Furtado, Melinda Vanderburg, Andrew Schulte, Jack Becker, Juliette Mann, Andrew W. Howell, Steve B. Kraus, Adam L. Barkaoui, Khalid Briceño, César Collins, Karen A. Conti, Dennis Jenkins, Jon M. Limbach, Mary Anne Quinn, Samuel N. Turner, Jake D. Twicken, Joseph D. Schwarz, Richard P. Seager, Sara Winn, Joshua N. Ziegler, Carl |
| author_facet | Distler, Adam Soares-Furtado, Melinda Vanderburg, Andrew Schulte, Jack Becker, Juliette Mann, Andrew W. Howell, Steve B. Kraus, Adam L. Barkaoui, Khalid Briceño, César Collins, Karen A. Conti, Dennis Jenkins, Jon M. Limbach, Mary Anne Quinn, Samuel N. Turner, Jake D. Twicken, Joseph D. Schwarz, Richard P. Seager, Sara Winn, Joshua N. Ziegler, Carl |
| contents | We present the discovery and characterization of TOI-4364\,b, a young mini-Neptune in the tidal tails of the Hyades cluster, identified through TESS transit observations and ground-based follow-up photometry. The planet orbits a bright M dwarf ($K=9.1$\,mag) at a distance of 44\,pc, with an orbital period of 5.42\,days and an equilibrium temperature of $488^{+4}_{-4}$\,K. The host star's well-constrained age of 710\,Myr makes TOI-4364\,b an exceptional target for studying early planetary evolution around low-mass stars. We determined a planetary radius of $2.01^{+0.1}_{-0.08}$\,Earth radii, indicating that this planet is situated near the upper edge of the radius valley. This suggests that the planet retains a modest H/He envelope. As a result, TOI-4364\,b provides a unique opportunity to explore the transition between rocky super-Earths and gas-rich mini-Neptunes at the early stages of evolution. Its radius, which may still evolve as a result of ongoing atmospheric cooling, contraction, and photoevaporation, further enhances its significance for understanding planetary development. Furthermore, TOI-4364\,b possesses a moderately high Transmission Spectroscopy Metric of 44.2, positioning it as a viable candidate for atmospheric characterization with instruments such as JWST. This target has the potential to offer crucial insights into atmospheric retention and loss in young planetary systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11990 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | TESS Hunt for Young and Maturing Exoplanets (THYME) XII: A Young Mini-Neptune on the Upper Edge of the Radius Valley in the Hyades Cluster Distler, Adam Soares-Furtado, Melinda Vanderburg, Andrew Schulte, Jack Becker, Juliette Mann, Andrew W. Howell, Steve B. Kraus, Adam L. Barkaoui, Khalid Briceño, César Collins, Karen A. Conti, Dennis Jenkins, Jon M. Limbach, Mary Anne Quinn, Samuel N. Turner, Jake D. Twicken, Joseph D. Schwarz, Richard P. Seager, Sara Winn, Joshua N. Ziegler, Carl Earth and Planetary Astrophysics We present the discovery and characterization of TOI-4364\,b, a young mini-Neptune in the tidal tails of the Hyades cluster, identified through TESS transit observations and ground-based follow-up photometry. The planet orbits a bright M dwarf ($K=9.1$\,mag) at a distance of 44\,pc, with an orbital period of 5.42\,days and an equilibrium temperature of $488^{+4}_{-4}$\,K. The host star's well-constrained age of 710\,Myr makes TOI-4364\,b an exceptional target for studying early planetary evolution around low-mass stars. We determined a planetary radius of $2.01^{+0.1}_{-0.08}$\,Earth radii, indicating that this planet is situated near the upper edge of the radius valley. This suggests that the planet retains a modest H/He envelope. As a result, TOI-4364\,b provides a unique opportunity to explore the transition between rocky super-Earths and gas-rich mini-Neptunes at the early stages of evolution. Its radius, which may still evolve as a result of ongoing atmospheric cooling, contraction, and photoevaporation, further enhances its significance for understanding planetary development. Furthermore, TOI-4364\,b possesses a moderately high Transmission Spectroscopy Metric of 44.2, positioning it as a viable candidate for atmospheric characterization with instruments such as JWST. This target has the potential to offer crucial insights into atmospheric retention and loss in young planetary systems. |
| title | TESS Hunt for Young and Maturing Exoplanets (THYME) XII: A Young Mini-Neptune on the Upper Edge of the Radius Valley in the Hyades Cluster |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2410.11990 |