TESS Investigation -- Demographics of Young Exoplanets (TI-DYE) IV: a Jovian radius planet orbiting a 34 Myr Sun-like star in the Vela association

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Bibliographic Details
Main Authors:	Barber, Madyson G., Mann, Andrew W., Vanderburg, Andrew, Barkaoui, Khalid, Collins, Karen A., Carrazco-Gaxiola, Sebastian, Evans, Phil, Fields, Matthew J., Gillon, Michael, Henry, Todd J., Hesse, Katharine M., Jao, Wei-Chun, Jehin, Emmanuel, Jenkins, Sydney, Johns, Tim, Rodriguez, David R., Schwarz, Richard P., Storch, William C., Watkins, Cristilyn N., Wilkin, Francis P.
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics
Online Access:	Acceder al recurso
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_version_	1866911264379240448
author	Barber, Madyson G. Mann, Andrew W. Vanderburg, Andrew Barkaoui, Khalid Collins, Karen A. Carrazco-Gaxiola, Sebastian Evans, Phil Fields, Matthew J. Gillon, Michael Henry, Todd J. Hesse, Katharine M. Jao, Wei-Chun Jehin, Emmanuel Jenkins, Sydney Johns, Tim Rodriguez, David R. Schwarz, Richard P. Storch, William C. Watkins, Cristilyn N. Wilkin, Francis P.
author_facet	Barber, Madyson G. Mann, Andrew W. Vanderburg, Andrew Barkaoui, Khalid Collins, Karen A. Carrazco-Gaxiola, Sebastian Evans, Phil Fields, Matthew J. Gillon, Michael Henry, Todd J. Hesse, Katharine M. Jao, Wei-Chun Jehin, Emmanuel Jenkins, Sydney Johns, Tim Rodriguez, David R. Schwarz, Richard P. Storch, William C. Watkins, Cristilyn N. Wilkin, Francis P.
contents	The discovery of infant (< 50 Myr), close-in (<30-day period) planets is vital in understanding the formation mechanisms that lead to the distribution of mature transiting planets as discovered by Kepler. Despite several discoveries in this age bin, the sample is still too small for a robust statistical comparison to older planets. Here we report the validation of TOI-6448 b, an 8.8 +/- 0.8 Re planet on a 14.8 day orbit. TOI-6448 was previously identified to be a likely member of Vela Population IV. We confirm the star's membership and re-derive the age of the cluster using isochrones, variability, and gyrochronology. We find the star, and thus planet, to be 34 +/- 3 Myr. Like other young planets, TOI-6448 b lands in a region of parameter space with few older planets. While just one data point, this fits with prior findings of an excess of 5-11Re planets around young stars far beyond what can be explained by reduced sensitivity at young ages. Our ongoing search of Vela, Taurus-Auriga, Sco-Cen, and Orion are expected to reveal dozens more < 50 Myr transiting planets.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_10734
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	TESS Investigation -- Demographics of Young Exoplanets (TI-DYE) IV: a Jovian radius planet orbiting a 34 Myr Sun-like star in the Vela association Barber, Madyson G. Mann, Andrew W. Vanderburg, Andrew Barkaoui, Khalid Collins, Karen A. Carrazco-Gaxiola, Sebastian Evans, Phil Fields, Matthew J. Gillon, Michael Henry, Todd J. Hesse, Katharine M. Jao, Wei-Chun Jehin, Emmanuel Jenkins, Sydney Johns, Tim Rodriguez, David R. Schwarz, Richard P. Storch, William C. Watkins, Cristilyn N. Wilkin, Francis P. Earth and Planetary Astrophysics The discovery of infant (< 50 Myr), close-in (<30-day period) planets is vital in understanding the formation mechanisms that lead to the distribution of mature transiting planets as discovered by Kepler. Despite several discoveries in this age bin, the sample is still too small for a robust statistical comparison to older planets. Here we report the validation of TOI-6448 b, an 8.8 +/- 0.8 Re planet on a 14.8 day orbit. TOI-6448 was previously identified to be a likely member of Vela Population IV. We confirm the star's membership and re-derive the age of the cluster using isochrones, variability, and gyrochronology. We find the star, and thus planet, to be 34 +/- 3 Myr. Like other young planets, TOI-6448 b lands in a region of parameter space with few older planets. While just one data point, this fits with prior findings of an excess of 5-11Re planets around young stars far beyond what can be explained by reduced sensitivity at young ages. Our ongoing search of Vela, Taurus-Auriga, Sco-Cen, and Orion are expected to reveal dozens more < 50 Myr transiting planets.
title	TESS Investigation -- Demographics of Young Exoplanets (TI-DYE) IV: a Jovian radius planet orbiting a 34 Myr Sun-like star in the Vela association
topic	Earth and Planetary Astrophysics
url	https://arxiv.org/abs/2511.10734