An ALMA Dynamical Mass Estimate of the Proposed Planetary-mass Companion FW Tau C

Abstract

Dynamical mass estimates down to the planet-mass regime can help to understand planet formation. We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of FW Tau C, a proposed ~10 $M_{\mathrm{Jup}}$ planet-mass companion at ~330 au from the host binary FW Tau AB. We spatially and spectrally resolve the accretion disk of FW Tau C in ${}^{12}$CO (2-1). By modeling the Keplerian rotation of gas, we derive a dynamical mass of ~0.1 $M_{\odot }$. Therefore, FW Tau C is unlikely a planet, but rather a low-mass star with a highly inclined disk. This also suggests that FW Tau is a triple system consisting of three ~0.1 $M_{\odot }$ stars.

Accepted for publication in ApJL

References in corpus (10)

• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• On the Luminosity of Young Jupiters
• Searching for circumplanetary disks around LkCa 15
• An ALMA Disk Mass for the Candidate Protoplanetary Companion to FW Tau
• ALMA Measurements of Circumstellar Material in the GQ Lup System
• An ALMA and MagAO Study of the Substellar Companion GQ Lup B
• An ALMA Constraint on the GSC 6214-210 B Circum-Substellar Accretion Disk Mass
• First millimeter detection of the disk around a young, isolated, planetary-mass object
• ALMA Observations of the Young Substellar Binary System 2M1207
• An upper limit on the mass of the circumplanetary disk for DH Tau b

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