Jets from the Upper Scorpious Variable Young Star System 2MASS J16075796-2040087 Via KECK/HIRES Spectro-astrometry

Emma Whelan; Miriam Keppler; Neal Turner; Ilaria Pascucci; Erika Hamden; Keri Hoadley; Min Fang

doi:10.48550/arxiv.2408.07217

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Jets from the Upper Scorpious Variable Young Star System 2MASS J16075796-2040087 Via KECK/HIRES Spectro-astrometry

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Jets from the Upper Scorpious Variable Young Star System 2MASS J16075796-2040087 Via KECK/HIRES Spectro-astrometry

Emma Whelan, Miriam Keppler, Neal Turner, Ilaria Pascucci, Erika Hamden, Keri Hoadley and Min Fang

ArXiv.org

Cornell University

08/13/2024

DOI: 10.48550/arxiv.2408.07217

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Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

2MASS J16075796-2040087 is a ~ 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 multi-component 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 MHD disk wind is present. The FEL high velocity component (HVC) traces an asymmetric, bipolar jet ~ 700 au long. The jet's position angle (PA) ~ 277 degrees is not perpendicular to the disk. The lower-velocity emission, classified previously as a disk wind low-velocity component (LVC), is found to have more in common with the HVC and overall it is not possible to identify a 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.

Physics - Astrophysics of Galaxies

Physics - Solar and Stellar Astrophysics

Details

Title: Subtitle: Jets from the Upper Scorpious Variable Young Star System 2MASS J16075796-2040087 Via KECK/HIRES Spectro-astrometry
Creators: Emma Whelan
Miriam Keppler
Neal Turner
Ilaria Pascucci
Erika Hamden
Keri Hoadley
Min Fang
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2408.07217
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 08/13/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984696783002771

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