Journal article
Jets from the Upper Scorpius Variable Young Star System 2MASS J16075796-2040087 via KECK/HIRES Spectro-astrometry
The Astrophysical journal, Vol.974(2), 293
10/01/2024
DOI: 10.3847/1538-4357/ad6c4e
Abstract
2MASS J16075796-2040087 is an ∼5 Myr young star in Upper Sco with evidence for accretion bursts on a timescale of about 15 days and, uncommonly for its age, outflows traced by multicomponent forbidden emission lines (FELs). The accretion bursts may be triggered by a companion at ∼4.6 au. We analyze HIRES spectra optimised for spectro-astrometry to better understand the origin of the several FEL velocity components and determine whether a magnetohydrodynamic (MHD) disk wind is present. The FEL high-velocity component (HVC) traces an asymmetric, bipolar jet ∼700 au long. The jet’s position angle ∼ 277° is not perpendicular to the disk. The lower-velocity emission, classified previously as a disk wind low-velocity component, is found to have more in common with the HVC and overall it is not possible to identify an MHD disk wind component. The spectro-astrometric signal of the low-velocity emission resembles those of jets and its density and ionisation fraction fall into the range of HVCs. We suggest a scenario where the accretion bursts due to the close companion power the jets past the age where such activity ends around most stars. The low-velocity emission here could come from a slow jet launched near the close companion and this emission would be blended with emission from the MHD wind.
Details
- Title: Subtitle
- Jets from the Upper Scorpius Variable Young Star System 2MASS J16075796-2040087 via KECK/HIRES Spectro-astrometry
- Creators
- Emma WhelanMiriam KepplerNeal TurnerIlaria PascucciErika HamdenKeri HoadleyMin Fang
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.974(2), 293
- Publisher
- IOP Publishing
- DOI
- 10.3847/1538-4357/ad6c4e
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Grant note
- NASA Exoplanets Research Program: 17-XRP17_2-0081 NASA: 80NM00018D0004
We are grateful to John O'Meara and the Keck Telescopes team for carrying out the observations and to Ann Marie Cody for discussion of burster stars. N.J.T.'s efforts were funded by NASA Exoplanets Research Program award 17-XRP17_2-0081. The work was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under contract 80NM00018D0004 with NASA.
- Language
- English
- Date published
- 10/01/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984736598302771
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