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Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1

Bohn, Alexander J.; Kenworthy, Matthew A.; Ginski, Christian; Rieder, Steven; Mamajek, Eric E.; Meshkat, Tiffany; Pecaut, Mark J.; Reggiani, Maddalena; de Boer, Jozua; Keller, Christoph U.; Snik, Frans; Southworth, John

Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1 Thumbnail


Authors

Alexander J. Bohn

Matthew A. Kenworthy

Christian Ginski

Steven Rieder

Eric E. Mamajek

Tiffany Meshkat

Mark J. Pecaut

Maddalena Reggiani

Jozua de Boer

Christoph U. Keller

Frans Snik



Abstract

Even though tens of directly imaged companions have been discovered in the past decades, the number of directly confirmed multiplanet systems is still small. Dynamical analysis of these systems imposes important constraints on formation mechanisms of these wide-orbit companions. As part of the Young Suns Exoplanet Survey we report the detection of a second planetary-mass companion around the 17 Myr-old, solar-type star TYC 8998-760-1 that is located in the Lower Centaurus Crux subgroup of the Scorpius–Centaurus association. The companion has a projected physical separation of 320 au and several individual photometric measurements from 1.1 to 3.8 microns constrain a companion mass of 6 ± 1 M Jup, which is equivalent to a mass ratio of q = 0.57 ± 0.10% with respect to the primary. With the previously detected 14 ± 3 M Jup companion that is orbiting the primary at 160 au, TYC 8998-760-1 is the first directly imaged multiplanet system that is detected around a young, solar analog. We show that circular orbits are stable, but that mildly eccentric orbits for either/both components (e > 0.1) are chaotic on gigayear timescales, implying in situ formation or a very specific ejection by an unseen third companion. Due to the wide separations of the companions TYC 8998-760-1 is an excellent system for spectroscopic and photometric follow-up with space-based observatories such as the James Webb Space Telescope.

Journal Article Type Article
Acceptance Date Jul 3, 2020
Online Publication Date Jul 22, 2022
Publication Date Jul 22, 2020
Journal The Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 898
Article Number L16
DOI https://doi.org/10.3847/2041-8213/aba27e
Keywords Extrasolar gas giants ; Exoplanet astronomy ; Exoplanet detection methods ; Exoplanets ; Direct imaging
Publisher URL https://doi.org/10.3847/2041-8213/aba27e

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