PENELLOPE II. CVSO 104: a pre-main sequence close binary with an optical companion in Ori OB1
Journal
Date Issued
2021
Author(s)
•
Boffin, H. M. J.
•
Manara, C. F.
•
•
Ábrahám, P.
•
•
Fang, M.
•
•
Herczeg, G. J.
•
Kóspál, Á.
•
Venuti, L.
•
Walter, F. M.
•
•
Grankin, K.
•
Siwak, M.
•
Alecian, E.
•
Cabrit, S.
Abstract
We present results of our study of the close pre-main sequence spectroscopic
binary CVSO 104 in Ori OB1, based on data obtained within the PENELLOPE legacy
program. We derive, for the first time, the orbital elements of the system and
the stellar parameters of the two components. The system is composed of two
early M-type stars and has an orbital period of about 5 days and a mass ratio
of 0.92, but contrarily to expectations does not appear to have a tertiary
companion. Both components have been (quasi-)synchronized, but the orbit is
still very eccentric. The spectral energy distribution clearly displays a
significant infrared excess compatible with a circumbinary disk. The analysis
of HeI and Balmer line profiles, after the removal of the composite
photospheric spectrum, reveals that both components are accreting at a similar
level. We also observe excess emission in H$\alpha$ and H$\beta$, which appears
redshifted or blueshifted by more than 100 km/s with respect to the mass center
of the system depending on the orbital phase. This additional emission could be
connected with accretion structures, such as funnels of matter from the
circumbinary disk. We also analyze the optical companion located at about 2".4
from the spectroscopic binary. This companion, that we named CVSO 104B, turns
out to be a background Sun-like star not physically associated with the PMS
system and not belonging to Ori OB1.
Volume
656
Start page
A138
Issn Identifier
0004-6361
Rights
open.access
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