Are Am stars and hot-Jupiter planets related?
C. Saffe, J. Alacoria, P. Miquelarena, R. Petrucci, M. Jaque, Arancibia, R. Angeloni, E. Martioli, M. Flores, E. Jofre, A. Collado, and F., Gunella

TL;DR
This study investigates whether hot-low mass companions like hot-brown dwarfs influence the development of Am stars, finding a higher incidence of Am stars among systems with hot-brown dwarfs compared to hot-Jupiters, suggesting a potential role in their formation.
Contribution
It provides the first evidence of a higher occurrence of Am stars in systems with hot-brown dwarfs, proposing a link between these companions and Am star development.
Findings
Higher incidence of Am stars with hot-brown dwarfs (50-75%)
Lower incidence of Am stars with hot-Jupiters (20-42%)
Hot-brown dwarfs may influence Am star formation
Abstract
Am stars are often components of short-period binary systems, where tidal interactions would result in low rotational velocities and help to develop the chemical peculiarities observed. However, the origin of single Am stars and Am stars that belong to wide binary systems is unclear. There is very recent evidence of an Am star hosting a hot-brown dwarf likely synchronized and other possible Am stars hosting hot-Jupiter planets. We wonder if these hot-low mass companions could play a role in the development of an Am star, that is to say, if they could help to mitigate the "single Am" problem. We studied a sample of 19 early-type stars, 7 of them hosting hot-brown dwarfs and 12 of them hosting hot-Jupiter planets. We detected 4 Am stars in our sample (KELT-19A, KELT-17, HATS-70 and TOI-503) and 2 possible Am stars (TOI-681 and HAT-P-69). In particular, we detected the new Am star HATS-70…
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