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Medientyp:
E-Artikel
Titel:
Gaia EDR3 Confirms a Red Dwarf Companion of the nearby F1 Star HD 105452 and Reveals a New Brown Dwarf Companion of the M4.5 Dwarf SCR J1214-2345
Beschreibung:
<jats:title>Abstract</jats:title>
<jats:p>There are 88 stars which lack colors, but have measured parallaxes in Gaia EDR3 that place them within 20 pc from the Sun. Among them we found two new common parallax and proper motion (CPPM) companions separated from their primaries by about 3″. The CPPM companion of a nearby (<jats:italic>d</jats:italic> = 14.98 pc) F1 star, <jats:named-content xmlns:xlink="http://www.w3.org/1999/xlink" content-type="object" xlink:href="HD 105452 B" xlink:type="simple">HD 105452 B</jats:named-content>, was already imaged with the Hubble Space Telescope and is now confirmed with Gaia data and photometrically classified by us as M4 dwarf. The other CPPM companion, <jats:named-content xmlns:xlink="http://www.w3.org/1999/xlink" content-type="object" xlink:href="SCR J1214-2345 B" xlink:type="simple">SCR J1214-2345 B</jats:named-content> orbiting an M4.5 dwarf at <jats:italic>d</jats:italic> = 10.77 pc, represents the faintest brown dwarf discovery made by Gaia so far. It was also imaged by the VISTA Hemisphere Survey and partly detected in the near-infrared. Our photometric classification led to an uncertain spectral type of T1 ± 3 and needs to be confirmed by spectroscopic follow-up.</jats:p>