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

MPG-Autoren

Asensio-Torres,  Ruben
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Currie,  Thayne
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Janson,  Markus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Desidera,  Silvano
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kuzuhara,  Masayuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hodapp,  Klaus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brandt,  Timothy D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guyon,  Olivier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lozi,  Julien
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Groff,  Tyler
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kasdin,  Jeremy
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chilcote,  Jeffrey
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jovanovic,  Nemanja
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martinache,  Frantz
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sitko,  Michael
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Serabyn,  Eugene
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wagner,  Kevin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Akiyama,  Eiji
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kwon,  Jungmi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Uyama,  Taichi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yang,  Yi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nakagawa,  Takao
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hayashi,  Masahiko
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McElwain,  Michael
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kudo,  Tomoyuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tamura,  Motohide
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Externe Ressourcen

https://ui.adsabs.harvard.edu/abs/2019A&A...622A..42A
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Zitation

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.


Zitierlink: https://hdl.handle.net/21.11116/0000-0005-D437-E
Zusammenfassung
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.