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BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Recent observations by the B-star Exoplanet Abundance Study (BEAST) illustrate the existence of substellar companions around very massive stars. Here, we present the detection of two lower mass companions to a relatively nearby (148.7−1.3+1.5 pc), young (17−4+3 Myr), bright (V = 6.632 ± 0.006 mag),...

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Main Authors: Viswanathan, Gayathri (Author) , Janson, Markus (Author) , Gratton, Raffaele (Author) , Squicciarini, Vito (Author) , Rodet, Laetitia (Author) , Ringqvist, Simon C. (Author) , Mamajek, Eric E. (Author) , Reffert, Sabine (Author) , Chauvin, Gaël (Author) , Delorme, Philippe (Author) , Vigan, Arthur (Author) , Bonnefoy, Mickaël (Author) , Engler, Natalia (Author) , Desidera, Silvano (Author) , Henning, Thomas (Author) , Hagelberg, Janis (Author) , Langlois, Maud (Author) , Meyer, Michael (Author)
Format: Article (Journal)
Language:English
Published: July 2023
In: Astronomy and astrophysics
Year: 2023, Volume: 675, Pages: 1-16
ISSN:1432-0746
DOI:10.1051/0004-6361/202346154
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202346154
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2023/07/aa46154-23/aa46154-23.html
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Author Notes:Gayathri Viswanath, Markus Janson, Raffaele Gratton, Vito Squicciarini, Laetitia Rodet, Simon C. Ringqvist, Eric E. Mamajek, Sabine Reffert, Gaël Chauvin, Philippe Delorme, Arthur Vigan, Mickaël Bonnefoy, Natalia Engler, Silvano Desidera, Thomas Henning, Janis Hagelberg, Maud Langlois, and Michael Meyer
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Summary:Recent observations by the B-star Exoplanet Abundance Study (BEAST) illustrate the existence of substellar companions around very massive stars. Here, we present the detection of two lower mass companions to a relatively nearby (148.7−1.3+1.5 pc), young (17−4+3 Myr), bright (V = 6.632 ± 0.006 mag), 2.58 ± 0.06 M⊙ B9V star HIP 81208 residing in the Sco-Cen association using the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument at the Very Large Telescope (VLT) in Chile. Our analysis of the photometry obtained gives mass estimates of 67−7+6 MJ for the inner companion and 0.135−0.013+0.010 M⊙ for the outer companion, indicating that the former is most likely a brown dwarf and the latter a low-mass star. The system is compact but unusual, as the orbital planes of the two companions are likely close to orthogonal. The preliminary orbital solutions we derive for the system indicate that the star and the two companions are likely in a Kozai resonance, rendering the system dynamically very interesting for future studies.
Item Description:Online veröffentlicht: 03. Juli 2023
Gesehen am 11.10.2023
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202346154

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