Searching for Extragalactic Exoplanetary Systems: The Curious Case of BD+20 2457

@article{Perottoni2021SearchingFE,
  title={Searching for Extragalactic Exoplanetary Systems: The Curious Case of BD+20 2457},
  author={H{\'e}lio D. Perottoni and Jo{\~a}o A. S. Amarante and Guilherme Limberg and Helio J. Rocha-Pinto and Silvia Rossi and Friedrich Anders and Lais Borbolato},
  journal={The Astrophysical Journal Letters},
  year={2021},
  volume={913}
}
Planets and their host stars carry a long-term memory of their origin in their chemical compositions. Thus, identifying planets formed in different environments improves our understating of planetary formation. Although restricted to detecting exoplanets within the solar vicinity, we might be able to detect planetary systems that formed in small external galaxies and later merged with the Milky Way. In fact, Gaia data have unequivocally shown that the Galaxy underwent several significant minor… 
Elemental Abundances of nearby M Dwarfs Based on High-resolution Near-infrared Spectra Obtained by the Subaru/IRD Survey: Proof of Concept
Detailed chemical analyses of M dwarfs are scarce but necessary to constrain the formation environment and internal structure of planets being found around them. We present elemental abundances of 13

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