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  Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system

Asensio-Torres, R., Currie, T., Janson, M., Desidera, S., Kuzuhara, M., Hodapp, K., et al. (2019). Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system. Astronomy and Astrophysics, 622.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D437-E Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D438-D
Genre: Journal Article

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Asensio-Torres, Ruben1, Author
Currie, Thayne1, Author
Janson, Markus1, Author
Desidera, Silvano1, Author
Kuzuhara, Masayuki1, Author
Hodapp, Klaus1, Author
Brandt, Timothy D.1, Author
Guyon, Olivier1, Author
Lozi, Julien1, Author
Groff, Tyler1, Author
Kasdin, Jeremy1, Author
Chilcote, Jeffrey1, Author
Jovanovic, Nemanja1, Author
Martinache, Frantz1, Author
Sitko, Michael1, Author
Serabyn, Eugene1, Author
Wagner, Kevin1, Author
Akiyama, Eiji1, Author
Kwon, Jungmi1, Author
Uyama, Taichi1, Author
Yang, Yi1, AuthorNakagawa, Takao1, AuthorHayashi, Masahiko1, AuthorMcElwain, Michael1, AuthorKudo, Tomoyuki1, AuthorHenning, Thomas1, AuthorTamura, Motohide1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: binaries: close stars: low-mass stars: pre-main sequence techniques: imaging spectroscopy planets and satellites: detection Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics
 Abstract: We present SCExAO/CHARIS 1.1-2.4 μm integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a projected separation of < 1″. Thanks to the high quality wavefront corrections provided by SCExAO, both companions are decisively detected without the employment of any PSF-subtraction algorithm to eliminate quasi-static noise. The spectrum of the outer C object is very well matched by Upper Scorpius M4 ± 0.5 standard spectra, with a Teff = 2945 ± 100 K and a mass of ̃350 MJup. HIP 79124 B is detected at a separation of only 180 mas in a highly-correlated noise regime, and it falls in the spectral range M6 ± 0.5 with Teff = 2840 ± 190 K and ̃100 MJup. Previous studies of stellar populations in Sco-Cen have highlighted a discrepancy in isochronal ages between the lower-mass and higher-mass populations. This could be explained either by an age spread in the region, or by conventional isochronal models failing to reproduce the evolution of low-mass stars. The HIP 79124 system should be coeval, and therefore it provides an ideal laboratory to test these scenarios. We place the three components in a color-magnitude diagram and find that the models predict a younger age for the two low-mass companions (̃3 Myr) than for the primary star (̃6 Myr). These results imply that the omission of magnetic effects in conventional isochronal models inhibit them from reproducing early low-mass stellar evolution, which is further supported by the fact that new models that include such effects provide more consistent ages in the HIP 79124 system.

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 Dates: 2019
 Publication Status: Published in print
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 622 Sequence Number: - Start / End Page: - Identifier: -