Open AccessCharacteristics of the closest known G‐type exoplanet host 82 Eri
Author(s) -
Bernkopf J.,
Chini R.,
Buda L.S.,
Dembsky T.,
Drass H.,
Fuhrmann K.,
Lemke R.
Publication year - 2012
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2012.21534.x
Subject(s) - physics , exoplanet , host (biology) , astronomy , type (biology) , astrobiology , astrophysics , planet , genetics , biology , ecology
We present a consistent model atmosphere analysis and evolutionary tracks for the very nearby G‐type star 82 Eri that was most recently announced by Pepe et al. to harbour two or three super‐Earth companions with orbital periods of 18, 40 and 90 d. As a bright and high‐velocity object, 82 Eri was already realized by Jan Hendrik Oort in his 1926 treatise to be of ‘probably different origin’ and we confirm its being a member of the ancient thick‐disc population on account of its outstanding iron‐to‐magnesium deficiency. Thus, in our immediate neighbourhood – only 6 pc away – there exists a system of extremely old and probably rocky super‐Earths that were already formed when the Milky Way was at its infancy, 12 or even 13 billion years in the past.