Gaia search for stellar companions of TESS Objects of Interest II

We present the latest results of our ongoing multiplicity study of (Community) TESS Objects of Interest, using astro‐ and photometric data from the ESA‐Gaia mission, to detect stellar companions of these stars and to characterize their properties. In total, 107 binary, 5 hierarchical triple star sys...

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Bibliographic Details
Published inAstronomische Nachrichten Vol. 342; no. 6; pp. 840 - 864
Main Authors Mugrauer, Markus, Michel, Kai‐Uwe
Format Journal Article
LanguageEnglish
Published Weinheim WILEY‐VCH Verlag GmbH & Co. KGaA 01.07.2021
Wiley Subscription Services, Inc
Subjects
Astrometry
binaries: visual
Binary stars
Photometry
stars: individual (TOI2092B, TOI2127B, CTOI253040591B, CTOI341411516B, CTOI369376388C)
Stellar systems
Target detection
Triple stars
White dwarf stars
white dwarfs
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Summary:We present the latest results of our ongoing multiplicity study of (Community) TESS Objects of Interest, using astro‐ and photometric data from the ESA‐Gaia mission, to detect stellar companions of these stars and to characterize their properties. In total, 107 binary, 5 hierarchical triple star systems, as well as one quadruple system were detected among 585 targets surveyed, which are all located at distances closer than about 500 pc around the Sun. As proven with their accurate Gaia EDR3 astrometry, the companions and the targets are located at the same distance and share a common proper motion, as it is expected for components of gravitationally bound stellar systems. The companions exhibit masses in the range between about 0.09 M⊙ and 4.5 M⊙ and are most frequently found in the mass range between 0.15 and 0.6 M⊙. The companions are separated from the targets by about 120 up to 9,500 au and their frequency is the highest and constant within about 500 au while it continually decreases for larger separations. Beside mainly early to mid M dwarfs, also five white dwarf companions were identified in this survey, whose true nature was revealed by their photometric properties.
Bibliography:This research is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, under NASA contract NAS 5–26555. These observations are associated with the program 14260.
ISSN:0004-6337
1521-3994
DOI:10.1002/asna.202113972