TOI-179: a young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit
S. Desidera, M. Damasso, R. Gratton, S. Benatti, D. Nardiello, V., D'Orazi, A.F. Lanza, D. Locci, F. Marzari, D. Mesa, S. Messina, I., Pillitteri, A. Sozzetti, J. Girard, A. Maggio, G. Micela, L. Malavolta, V., Nascimbeni, M. Pinamonti, V. Squicciarini, J. Alcala, K. Biazzo

TL;DR
This study confirms a young, Neptune-mass transiting planet around TOI-179, characterizes its properties, and reveals a low-mass companion, providing insights into planetary evolution and star-planet interactions.
Contribution
First comprehensive characterization of the TOI-179 system, including the transiting planet and a low-mass outer companion, using multi-method observational data.
Findings
The planet has a 4.1374-day period, 24 Earth masses, and a significant eccentricity.
A low-mass companion (~83 Jupiter masses) was detected at 3.3 au.
The system's age is approximately 400 million years.
Abstract
Transiting planets around young stars are key benchmarks for our understanding of planetary systems. One of such candidates was identified around the K dwarf HD 18599 by TESS, labeled as TOI-179. We present the confirmation of the transiting planet and the characterization of the host star and of the TOI-179 system over a broad range of angular separations. To this aim, we exploited the TESS photometric time series, intensive radial velocity monitoring performed with HARPS, and deep high-contrast imaging observations obtained with SPHERE and NACO at VLT. The inclusion of Gaussian processes regression analysis is effective to properly model the magnetic activity of the star and identify the Keplerian signature of the transiting planet. The star, with an age of 400+-100 Myr, is orbited by a transiting planet with period 4.137436 days, mass 24+-7 Mearth, radius 2.62 (+0.15-0.12) Rearth,…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astro and Planetary Science
